# Patent

## Title
Oxime ester photoinitiators

## Abstract

Compounds of formula (I), (II), and (III), wherein R1, R2, R′2 and R′′′2 for example are C1-C20alkyl, provided that at least one of R1, R2, R′2 and R′′′2 carries a specified substituent; R3, R4, and R5 for example independently of one another are hydrogen or a defined substituent provided that at least one of R3, R4 or R5 is other than hydrogen or C1-C20alkyl; R6, R7, R8, R′7, RV, R′8, R′′6, R′′7, R′′′6 and R′′′7 for example independently of one another have one of the meanings as given for R3, R4, and R5; and R9 for example is C1-C20alkyl; exhibit an unexpectedly good performance in photopolymerization reactions.

## Background
The invention pertains to new oxime ester compounds based on specific carbazole derivatives, and their use as photoinitiators in photopolymerizable compositions.
From U.S. Pat. No. 3,558,309 it is known that certain oxime ester derivatives are photoinitiators. In U.S. Pat. No. 4,255,513 oxime ester compounds are disclosed. U.S. Pat. No. 6,596,445 describes some oxime ester compounds having electron-donating groups. U.S. Pat. No. 4,202,697 discloses acrylamino-substituted oxime esters. In JP 7-140658 A (=Derwent No. 95-234519/31), Bull. Chem. Soc. Jpn. 1969, 42(10), 2981-3, Bull. Chem. Soc. Jpn. 1975, 48(8), 2393-4, Han'guk Somyu Konghakhoechi 1990, 27(9), 672-85 (=Chem. Abstr. 115:115174), Macromolecules, 1991, 24(15), 4322-7 and European Polymer Journal, 1970, 933-943 some aldoxime ester compounds are described. In U.S. Pat. No. 4,590,145 and JP 61-024558-A (=Derwent No. 86-073545/11) several benzophenone oxime ester compounds are disclosed. In Glas. Hem. Drus. Beograd, 1981, 46(6), 215-30, J. Chem. Eng. Data 9(3), 403-4 (1964), J. Chin. Chem. Soc. (Taipei) 41 (5) 573-8, (1994), JP 62-273259-A (=Chemical Abstract 109:83463w), JP 62-286961-A (=Derwent No. 88-025703/04), JP 62-201859-A (=Derwent No. 87-288481/41), JP 62-184056-A (=Derwent No. 87-266739/38), U.S. Pat. No. 5,019,482 and J. of Photochemistry and Photobiology A 107, 261-269 (1997) some p-alkoxy-phenyl oxime ester compounds are described. Further, oxime ester compounds are disclosed in WO 02/100903, WO 04/050653, WO 06/018405, International Patent Application No. EP2006/068202 and International Patent Application No. EP2006/068254.
In photopolymerization technology there still exists a need for highly reactive, easy to prepare and easy to handle photoinitiators. For example, in color filter resist applications, highly pigmented resists are required for the high color quality property. With the increase of the pigment content, the curing of color resists becomes more difficult. Hence, a photoinitiator having a higher sensitivity than current initiation systems is required. In addition, also such new photoinitiators must meet the high requirements of the industry regarding properties like, for example, high solubility, thermal stability and storage stability.
Surprisingly it was found, that compounds of the formula I, II and III




wherein

    R1 is hydrogen, (CO)R′′2, C1-C20alkoxycarbonyl, phenyl-C1-4alkyl, C1-C20alkyl which optionally is substituted by one or more halogen, COOR11 or CONR12R13;
    or R1 is C2-C20alkyl which is interrupted by O, CO or NR14; or is C2-C12alkenyl which optionally is interrupted by O, CO or NR14, or is C4-C8cycloalkenyl or C2-C12alkinyl;
    or R1 is benzoyl, naphthoyl, phenyloxycarbonyl or naphthyloxycarbonyl; or is benzoyl, naphthoyl, phenyloxycarbonyl or naphthyloxycarbonyl each of which is substituted by one or more C1-C20alkyl, C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    or R1 is C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or is C3-C10cycloalkylcarbonyl which optionally is interrupted by O, CO or NR14, or is C3-C10cycloalkyloxycarbonyl which optionally is interrupted by O, CO or NR14;
    or R1 is unsubstituted phenyl or naphthyl, or is phenyl or naphthyl which is substituted by one or more C1-C20alkyl, C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2, or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    R2 and R′2 independently of each other are hydrogen, C1-C20alkyl which C1-C20alkyl optionally contains one or more C—C multiple bonds;
    C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14 and which uninterrupted or interrupted C3-C10cycloalkyl optionally contains one or more C—C multiple bonds;
    or R2 and R′2 are C1-C20alkyl which is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,






     phenyl or by phenyl which is substituted by SR10, OR11 or NR12R13, which substituted C1-C20alkyl optionally contains one or more C—C multiple bonds;
    or R2 and R′2 are C2-C20alkyl which is interrupted by one or more O and/or optionally is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,






     phenyl or by phenyl which is substituted by SR10, OR11, or NR12R13, which interrupted C2-C20alkyl optionally contains C—C multiple bonds;
    or R2 and R′2 are unsubstituted phenyl, naphthyl or C1-C20heteroaryl; or are phenyl, naphthyl or C1-C20heteroaryl which is substituted by one or more C1-C12alkyl, C2-C12alkenyl, C2-C12alkynyl, phenyl, halogen, CN, NO2, SR10, OR11, NR12R13 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    or R2 and R′2 are C2-C20alkanoyl, or benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, phenyl, SR10, OR11 or NR12R13;
    or R2 and R′2 are C2-C12alkoxycarbonyl which optionally is interrupted by one or more O and/or optionally is substituted by one or more OH;
    or R2 and R′2 are phenoxycarbonyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, phenyl, SR10, OR11 or NR12R13;
    or R2 and R′2 are NR12R13 or






     or R2 and R′2 form a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group






     or (CO)R′2 is attached, wherein said formed ring is unsubstituted or substituted;
    R′′2 has one of the meanings given for R2 and R′2 or is






    R′′′2 has one of the meanings given for R2 and R′2 or is






    R3, R4, and R5 independently of one another are hydrogen, halogen,






     C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or are C2-C12alkenyl which optionally is interrupted by O, CO or NR14, or are C4-C8cycloalkenyl, C2-C12alkinyl, phenyl-C1-C4alkyl, CN, NO2 or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    or R3, R4, and R5 are phenyl which is unsubstituted or substituted by one or more C1-C20alkyl, halogen, CN, SR10, OR11 or NR12R13;
    or R3, R4, and R5 are (CO)R′2, SR10, OR11, SOR10, SO2R10 or NR12R13, wherein the substituents (CO)R′2, OR11, SR10 and NR12R13 optionally form 5- or 6-membered rings via the radicals R10, R11, R12 R13, and/or R′2 with further substituents on the phenyl ring or with one of the carbon atoms of the phenyl ring;

provided that

    (i) at least one of R3, R4 or R5 is other than hydrogen or C1-C20alkyl; and that
    (ii) if one of R3, R4 or R5 in the para position of the phenyl ring is SR10 then R10 is not unsubstituted phenyl; and
    (iii) if one of R3, R4 or R5 in the para position of the phenyl ring is NR12R13, then R12 and R13 are not both C1-C20alkyl; and
    (iv) if one of R3, R4 or R5 in the para position of the phenyl ring is NR12R13 and R12 and R13 together with the N-atom to which they are attached form a ring, said ring is not a morpholino ring; and
    (v) if R3 is hydrogen, R4 is hydrogen or C1-C20alkyl in the ortho-position of the phenyl ring and R5 is OR11 in the para-position of the phenyl ring, then R11 is not C3-C10cycloalkyl or C3-C10cycloalkyl which is interrupted by O;
    R6, R7, R8, R′6, R′7, R′8, R′′6, R′′7, R′′′6 and R′′′7 independently of one another have one of the meanings as given for R3, R4 and R5;
    or R′′6 and R′′7 in formula II together are C1-C6alkylene or C2-C6alkenylene to form a bicyclic ring together with the phenyl to which they are attached, wherein said bicyclic ring optionally is substituted by one or more C1-C20alkyl, or by C2-C20alkyl which is interrupted by O, CO or NR14, or said bicyclic ring optionally is substituted by C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2, or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14; provided that the group






     is attached to either ring;
    or R′′′6 and R′′′7 in formula III together are C2-C6alkylene or C2-C6alkenylene to form a bicyclic ring together with the phenyl to which they are attached, wherein said bicyclic ring optionally is substituted by one or more C1-C20alkyl, by C2-C20alkyl which is interrupted by O, CO or NR14, or said bicyclic ring optionally is substituted by C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2, or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    provided that one or more groups (CO)R′′′2 are attached to either ring;
    R9 is hydrogen, C3-C8cycloalkyl, C2-C5alkenyl, C1-C20alkoxy, unsubstituted C1-C20alkyl or C1-C20alkyl which is substituted by one or more halogen, phenyl, C1-C20alkylphenyl and/or CN;
    or R9 is phenyl or naphthyl, both of which are unsubstituted or substituted by one or more C1-C6alkyl, halogen, CN, OR11, SR10 and/or NR12R13;
    or R9 is benzyloxy or phenoxy both of which are unsubstituted or substituted by one or more C1-C6alkyl and/or halogen;
    R10 is hydrogen, C1-C20alkyl, C3-C12alkenyl, C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or R10 is phenyl-C1-4alkyl or is C1-C20alkyl which is substituted by OH, SH, CN, C3-C6alkenoxy, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S,






     —(CO)OH or —(CO)O(C1-C4alkyl);
    or R10 is C2-C20alkyl which is interrupted by one or more O or S;
    or R10 is —(CH2CH2O)nH, —(CH2CH2O)n(CO)—(C1-C8alkyl), C2-C8alkanoyl, benzoyl, C3-C12alkenyl or C3-C6alkenoyl;
    or R10 is phenyl, naphthyl or C1-C20heteroaryl, each of which is unsubstituted or substituted by one or more halogen, C1-C12alkyl, C1-C12alkoxy, phenyl-C1-C3alkyloxy, phenoxy, C1-C12alkylsulfanyl, phenylsulfanyl, —N(C1-C12alkyl)2, diphenylamino, —(CO)O(C1-C8alkyl) or by (CO)N(C1-C8alkyl)2;
    or R10 is phenyl, naphtyl or C1-C20heteroaryl which forms a 5- or 6-membered ring with the phenyl ring to which the SR10 is attached via a direct bond, C1-C4alkylene, O, S, NR14 or CO, wherein said phenyl or naphthyl is unsubstituted or substituted by one or more C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or is substituted by C3-C10cycloalkyl which is optionally interrupted by O, CO or NR14, or is substituted by halogen, C1-C20alkoxy, C1-C20alkylcarbonyl or phenylcarbonyl;
    n is an integer from 1-12;
    R11 is hydrogen, C1-C20alkyl which optionally is substituted by one or more halogen; or R11 is —(CH2CH2O)nH, —(CH2CH2O)n(CO)—(C1-C8alkyl), C1-C8alkanoyl, C3-C12alkenyl, C3-C6alkenoyl, phenyl-C1-C4alkyl or is C2-C20alkyl which is interrupted by one or more O; or is C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    or R11 is C1-C20alkyl which is substituted by OH, SH, CN, C3-C6alkenoxy, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, —OCH2CH2CN, —OCH2CH2(CO)O(C1-C4alkyl),






     —O(CO)—(C1-C4alkyl), —O(CO)-phenyl, —(CO)OH or —(CO)O(C1-C4alkyl);
    or R11 is benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, OH or C1-C4alkoxy;
    or R11 is phenyl, naphthyl or C1-C20heteroaryl each of which is unsubstituted or substituted by one or more halogen, OH, C1-C12alkyl, C3-C10cycloalkyl or C1-C12alkoxy;
    R12 and R13 independently of one another are hydrogen, C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or are C2-C4hydroxyalkyl, C1-C12alkoxy, phenyl-C1-C4alkyl, (CO)R15, C2-C10alkoxyalkyl, C3-C5alkenyl or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    or R12 and R13 are phenyl or naphthyl, each of which is unsubstituted or substituted by one or more C1-C20alkoxy, (CO)R15, phenyl, NR18R17, SR10, OR11, C1-C20alkyl, by C2-C20alkyl which is interrupted by O, CO or NR14 or are substituted by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    or R12 and R13 independently of each other are C2-C5alkylene or C2-C5alkenylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR12R13 is attached, wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O, CO or NR14; or
    R12 and R13 independently of one another are phenyl which is attached via a direct bond to the phenyl ring on which the NR12R13 is positioned; or

R12 and R13 together with the N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring which optionally is interrupted by O, N or NR14, and which ring is unsubstituted or substituted by one or more C1-C20alkyl, C1-C20alkoxy, ═O, SR10, OR11, NR18R17, (CO)R15, NO2, CN, phenyl or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14; or

    R12 and R13 together with the N-atom to which they are attached form a heteroaromatic ring system, which heteroaromatic ring system is unsubstituted or substituted by one or more C1-C20alkyl, C1-C20alkoxy, ═O, SR10, OR11, NR16R17, (CO)R15, NO2, CN, phenyl or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    R14 is hydrogen, C1-C20alkyl, C3-C8cycloalkyl, phenyl or (CO)R15;
    R15 is hydrogen, OH, C1-C20alkyl, C1-C4haloalkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or is C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or is phenyl-C1-4alkyl, SR10, OR11 or NR12R13;
    or R15 is phenyl, naphthyl or C1-C20heteroaryl all of which are unsubstituted or substituted by one or more SR10, OR11, NR12R13,






     CN, NO2, halogen, C1-C20alkyl, C1-C4haloalkyl, by C2-C20alkyl which is interrupted by O, CO or NR14 or are substituted by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    R16 and R17 independently of each other are hydrogen, C1-C20alkyl, C3-C10cycloalkyl or phenyl; or
    R16 and R17 together with N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring, which optionally is interrupted by O, S or NR14;
    or R16 and R17 independently of one another are C2-C5alkylene or C2-C5alkenylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR16R17 is attached, wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O, CO or NR15, and to which C2-C5alkylene or C2-C5alkenylene optionally a benzene ring is condensed;
    R18, R19, R20, R′18, R′19, and R′20 independently of one another are hydrogen, halogen,






     C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or are C2-C12alkenyl which optionally is interrupted by O, CO or NR14, or are C4-C8cycloalkenyl, C2-C12alkinyl, phenyl-C1-4alkyl, CN, NO2 or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    or R18, R19, R20, R′18, R′19, and R′20 are phenyl which is unsubstituted or substituted by one or more C1-C20alkyl, halogen, CN, SR10, OR11 or NR12R13;
    or R18, R19, R20, R′18, R′19, and R′20 are (CO)R′2, SR10, OR11, SOR10, SO2R10 or NR12R13, wherein the substituents (CO)R′2, OR11, SR10 and NR12R13 optionally form 5- or 6-membered rings via the radicals R10, R11, R12 R13, and/or R′2 with further substituents on the phenyl ring or with one of the carbon atoms of the phenyl ring;
    R′′18 and R′′19 independently of each other have one of the meanings as given for R′′6 and R′′7; and
    R′′′18 and R′′′19 independently of each another have one of the meanings as given for R′′′6 and R′′′7;
    R21 is COOR11, CONR12R13 or (CO)R9; or R21 has one of the meanings as given for R15;
    R22 is COOR11, CONR12R13 or (CO)R9; or R22 has one of the meanings as given for R12 and R13;
    X is O, S, SO or SO2;
    X2 is a direct bond, C1-C20alkylene which optionally is interrupted by O, CO or NR14, and which uninterrupted or interrupted C1-C20alkylene is unsubstituted or substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,






     phenyl or by phenyl which is substituted by halogen, C1-C20alkyl, C1-C4haloalkyl, SR10, OR11, or NR12R13, and which unsubstituted or substituted, interrupted or non-interrupted C1-C20alkylene optionally contains one or more C—C multiple bonds;
    m is an integer 1 or 2;
    R23 has one of the meanings as given for R9;
    R24 is hydrogen, C1-C20alkyl; C2-C20alkenyl; C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or R24 is C3-C10cycloalkenyl; C1-C20alkyl which is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,






     or by phenyl;
    or R24 is C2-C20alkyl which is interrupted by one or more O and/or optionally is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,






     or by phenyl;
    or R24 is phenyl, naphthyl or C1-C20heteroaryl, all of which optionally are substituted by one or more C1-C12alkyl, phenyl, halogen, C1-C4haloalkyl, CN, NO2, SR10, OR11, NR12R13 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    or R24 is C2-C20alkanoyl, or benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, phenyl, SR10, OR11 or NR12R13;
    or R24 is C2-C12alkoxycarbonyl which optionally is interrupted by one or more O and/or optionally is substituted by one or more OH;
    or R24 is phenoxycarbonyl which is unsubstituted or substituted by one or more C1-C6alkyl, C1-C4haloalkyl, halogen, phenyl, SR10, OR11 or NR12R13;
    or R24 is NR12R13;
    or R24 forms a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group






     is attached, wherein said formed ring is unsubstituted or substituted; or
    R24 is






provided that

    (a) at least one of
    
        R2 in formula I or III,
        R′2 in the group (CO)R′2 
        
            in the definition of R3, R4, R5, R6, R7, R′6 or R′7 in formula I or
            in the definition of R6, R7, R8, R′6, R′7, R′8, R′′6 or R′′7 in formula II or
            in the definition of R6, R7, R8, R′6, R′7, R′′′6 or R′′7 in formula III or
            in the definition of R18, R19, R20, R′18, R′19, R′20 in the group number
        
        
    
    






    
    
        
        
             for either R′′′2 in formula III or for R24 in formula I, II or III via the radicals R2 or R′2;
        
        
        R′′2 in formula II or
        
            in the group (CO)R′′2 in R1 of formula I or
            in the group
        
        
    
    






    
    
        
        
             in R15 in formula I via the radicals R1 or R14 or in formula II via the radicals R12 or R13 or in formula III via the radicals R12 or R13, or
        
        
        R′′′2 in formula III
        is NR12R13 or
    
    






    (b) at least one of
    
        R2 in formula I or III,
        R′2 in the group (CO)R′2 
        
            in the definition of R3, R4, R5, R6, R7, R′6 or R′7 in formula I or
            in the definition of R6, R7, R8, R′6, R′7, R′8, R′′6 or R′′7 in formula II or
            in the definition of R6, R7, R8, R′6, R′7, R′′′6 or R′′7 in formula III or
            in the definition of R18, R19, R20, R′18, R′20 in the group
        
        
    
    






    
    
        
        
             for either R′′′2 in formula III or for R24 in formula I, II or III via the radicals R2 or R′2;
        
        
        R′′2 in formula II or
        
            in the group (CO)R′′2 in R1 of formula I or
            in the group
        
        
    
    






    
    
        
        
             in R15 in formula I via the radicals R1 or R14 or in formula II via the radicals R12 or R13 or in formula III via the radicals R12 or R13, or
        
        
        R′′′2 in formula III
        forms a ring with one of the C-atoms of the phenyl or naphthyl ring to which the corresponding group
    
    






    
    
         (CO)R′2 or (CO)R′′′2 is attached; or
    
    
    (c) at least one of
    
        R2 in formula I or III,
        R′2 in the group (CO)R′2 
        
            in the definition of R3, R4, R5, R6, R7, R′6 or R′7 in formula I or
            in the definition of R6, R7, R8, R′6, R′7, R′8, R′′6 or R′′7 in formula II or
            in the definition of R6, R7, R8, R′6, R′7, R′′′6 or R′′7 in formula III or
            in the definition of R18, R19, R20, R′18, R′20 in the group
        
        
    
    






    
    
        
        
             for either R′′′2 in formula III or for R24 in formula I, II or III via the radicals R2 or R′2;
        
        
        R′′2 in formula II or
        
            in the group (CO)R′′2 in R1 of formula I or
            in the group
        
        
    
    






    
    
        
        
             in R15 in formula I via the radicals R1 or R14 or in formula II via the radicals R12 or R13 or in formula III via the radicals R12 or R13, or
        
        
        R′′′2 in formula III
        contains one or more C—C multiple bonds; or
    
    
    (d) at least one of
    
        R2 in formula I or III,
        R′2 in the group (CO)R′2 
        
            in the definition of R3, R4, R5, R6, R7, R′6 or R′7 in formula I or
            in the definition of R6, R7, R8, R′6, R′7, R′8, R′′6 or R′′7 in formula II or
            in the definition of R6, R7, R8, R′6, R′7, R′′′6 or R′′7 in formula III or
            in the definition of R18, R19, R20, R′18, R′19, R′20 in the group
        
        
    
    






    
    
        
        
             for either R′′′2 in formula III or for R24 in formula I, II or III via the radicals R2 or R′2;
        
        
        R′′2 in formula II or
        
            in the group (CO)R′′2 in R1 of formula I or
            in the group
        
        
    
    






    
    
        
        
             in R15 in formula I via the radicals R1 or R14 or in formula II via the radicals R12 or R13 or in formula III via the radicals R12 or R13, and
        
        
        R′′′2 in formula III or
        R10 or R11 occurring in the groups SR10, OR11 or COOR11 as a substituent in any of the formula I, II or III
        is C1-C20alkyl which is substituted by one or more C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S or
    
    






    
    
         or
    
    
    (e) at least one of
    
        R′′′2 in formula III or
        R10 or R11 occurring in the groups SR10, OR11 or COOR11 as a substituent in any of the formula I, II or III
    
    
    is an unsubstituted or substituted C1-C20heteroaryl.


The definitions of the compounds of the formula I, II and III as given above, are restricted by provisos (a)-(e) as given above and in other words provisos (a′)-(e′) below

    (a′) at least one of R2, R′2, R′′2 and R′′′2 is NR12R13 or






     or
    (b′) at least one of R2, R′2, R′′2 and R′′′2 forms a ring with one of the C-atoms of the phenyl or naphthyl ring to which the corresponding group






    
    
        (CO)R′2 or (CO)R′′′2 is attached; or
    
    
    (c′) at least one of R2, R′2, R′′2 and R′′′2 contains one or more C—C multiple bonds; or
    (d′) at least one of R2, R′2, R′′2, R′′′2, R10 and R11 is C1-C20alkyl which is substituted by one or more C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S or






    
    
        or
    
    
    (e′) at least one of R′′′2, R10, and R11 is an unsubstituted or substituted C1-C20heteroaryl.


The compounds of the formula I, II and III are characterized in at least one specific substituent as defined above [(a)-(d)] is present in the molecule.
In accordance with the invention, the compounds of the formula I, II and III can be used as photoinitiators for the photopolymerization of ethylenically unsaturated compounds or of mixtures which comprise such compounds.
C1-C20alkyl is linear or branched and is, for example, C1-C18—, C1-C14—, C1-C12—, C1-C8—, C1-C6— or C1-C4alkyl. Examples are methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, pentyl, hexyl, heptyl, 2,4,4-trimethylpentyl, 2-ethylhexyl, octyl, nonyl, decyl, dodecyl, tetradecyl, pentadecyl, hexadecyl, octadecyl and icosyl. C1-C18alkyl, C1-C14alkyl, C1-C12alkyl, C1-C8alkyl, C1-C6alkyl and C1-C4alkyl have the same meanings as given above for C1-C20alkyl up to the corresponding number of C-atoms.
C2-C20alkyl interrupted by O, CO or NR14 is for example interrupted once or more times, e.g. 1-9, 1-7 or once or twice by O, CO or NR14, respectively. In case the groups are interrupted by more than one O, said O-atoms are separated from one another by at least one methylene group, i.e. the O-atoms are non-consecutive. Examples are the following structural units —CH2—O—CH3, —CH2CH2—O—CH2CH3, —[CH2CH2O]y—CH3, with y=1-9, —(CH2CH2O)7CH2CH3, —CH2—CH(CH3)—O—CH2—CH2CH3, or —CH2—CH(CH3)—O—CH2CH3.
C1-C4haloalkyl is C1-C4-alkyl mono- or poly-substituted by halogen, C1-C4-alkyl being, for example, as defined above. The alkyl radical is for example mono- or poly-halogenated, up to the exchange of all H-atoms by halogen. Examples are chloromethyl, trichloromethyl, fluoromethyl, difluoromethyl, trifluoromethyl or 2-bromopropyl, especially trifluoromethyl or trichloromethyl.
C1-C20alkyl, substituted C1-C20alkyl and interrupted C2-C20alkyl which contains C—C multiple bonds is meant to comprise either one or more, e.g. 1, 2 or 3, in particular 1, C—C double bond or C—C triple bond. C1-C20alkyl which contains C—C multiple bonds is for example C1-C6alkenyl as described below.
C3-C12Cycloalkyl is for example cyclopropyl, cyclopentyl, cyclohexyl, cyclooctyl, cyclo-dodecyl, especially cyclopentyl and cyclohexyl, preferably cyclohexyl.
C3-C12Cycloalkyl in the context of the present application is to be understood as alkyl which at least comprises one ring. For example cyclopropyl, methyl-cyclopentyl, cyclopentyl, cyclohexyl, methyl- or dimethylcyclohexyl, cyclooctyl, especially cyclopentyl and cyclohexyl, preferably cyclohexyl are also meant. Further examples are structures like




as well as bridged or fused ring systems, e.g.





etc. are also meant to be coverd by the term.

C3-C12Cycloalkyl interrupted by O, CO or NR14 has the meanings given above, wherein at least one CH2-group of the alkyl is exchanged by either O, CO or NR14. Examples are structures like




etc.

C3-C10cycloalkyl which contains C—C multiple bonds is meant to comprise either one or more, e.g. 1, 2 or 3, in particular 1, C—C double bond or C—C triple bond. C3-C10cycloalkyl which contains C—C multiple bonds is for example C3-C8cycloalkenyl as described below.
Phenyl-C1-C4alkyl is for example benzyl, phenylethyl, α-methylbenzyl, phenylbutyl, phenylpropyl or α,α-dimethylbenzyl, especially benzyl. Substituted phenyl-C1-C4alkyl is substituted one to four times, for example once, twice or three times, especially twice or three times, preferably on the phenyl ring.
C2-C12alkenyl radicals are mono or polyunsaturated, linear or branched and are for example C2-C8—, C2-C6—, C2-C5— or C2-C4alkenyl. Examples are allyl, methallyl, vinyl, 1,1-dimethylallyl, 1-butenyl, 3-butenyl, 2-butenyl, 1,3-pentadienyl, 5-hexenyl or 7-octenyl, especially allyl or vinyl.
C4-C8cycloalkenyl, has one or more double bonds and is for example C4-C6cycloalkenyl or C6-C8-cycloalkenyl. Examples are cyclobutenyl, cyclopentenyl, cyclohexenyl or cyclooctenyl, especially cyclopentenyl and cyclohexenyl, preferably cyclohexenyl.
C2-C12alkynyl or C2-C12alkinyl radicals are mono or polyunsaturated, linear or branched and are for example C2-C8—, C2-C6— or C2-C4alkinyl. Examples are ethinyl, propinyl, butinyl, 1-butinyl, 3-butinyl, 2-butinyl, pentinyl hexinyl, 2-hexinyl, 5-hexinyl, octinyl, etc.
C1-C20alkylphenyl corresponds to phenyl that is substituted once or more times by alkyl at the phenyl ring and is for example C1-C12alkyl-, C1-C8alkyl- or C1-C4alkylphenyl, wherein the number of the alkyl corresponds to the total number of all C-atoms in all alkyl-substituents at the phenyl ring. Examples are tolyl, xylyl, mesityl, ethylphenyl, diethylphenyl, in particular tolyl and mesityl.
C1-C20alkoxy is linear or branched and is for example C1-C18—, C1-C16—, C1-C12—, C1-C6— or C1-C4-alkoxy. Examples are methoxy, ethoxy, propoxy, isopropoxy, n-butyloxy, sec-butyloxy, iso-butyloxy, tert-butyloxy, pentyloxy, hexyloxy, heptyloxy, 2,4,4-trimethylpentyloxy, 2-ethylhexyloxy, octyloxy, nonyloxy, decyloxy, dodecyloxy, hexadecyloxy, octadecyloxy or icosyloxy, in particular methoxy, ethoxy, propoxy, isopropoxy, n-butyloxy, sec-butyloxy, iso-butyloxy, tert-butyloxy, especially methoxy.
C1-C12alkylsulfanyl is C1-C12alkyl, which at the “yl” moiety bears one-S-atom. C1-C12alkyl has the same meanings as given above for C1-C20alkyl up to the corresponding number of C-atoms. C1-C12alkylsulfanyl is linear or branched, for example, methylsulfanyl, ethylsulfanyl, propylsulfanyl, isopropylsulfanyl, n-butylsulfanyl, sec-butylsulfanyl, isobutylsulfanyl, tert-butylsulfanyl
C3-C6alkenoxy radicals are mono or polyunsaturated and are for example allyloxy, methallyloxy, butenyloxy, pentenoxy, 1,3-pentadienyloxy, 5-hexenyloxy.
C1-C20alkylcarbonyl corresponds to C1-C20alkanoyl and is linear or branched and is, for example, C1-C18—, C1-C14—, C1-C12—, C2-C8—, C1-C6— or C1-C4alkanoyl or C4-C12— or C4-C8alkanoyl. Examples are formyl, acetyl, propionyl, butanoyl, isobutanoyl, pentanoyl, hexanoyl, heptanoyl, octanoyl, nonanoyl, decanoyl, dodecanoyl, tetradecanoyl, pentadecanoyl, hexadecanoyl, octadecanoyl, icosanoyl, preferably acetyl. C2-C8alkanoyl, C2-C6alkanoyl and C2-C4alkanoyl have the same meanings as given above for C2-C20alkanoyl up to the corresponding number of C-atoms.
C3-C6alkenoyl radicals are mono or polyunsaturated and are for example propenoyl, 2-methyl-propenoyl, butenoyl, pentenoyl, 1,3-pentadienoyl, 5-hexenoyl.
C3-C10cycloalkylcarbonyl corresponds to cycloalkyl as defined above, wherein the “yl” is attached to a CO moiety. Examples are cyclohexylcarbonyl, cyclopentylcarbonyl,




as well as bridged or fused ring systems, e.g.





etc. are also meant to be covered.

C3-C10cycloalkylcarbonyl interrupted by O or NR14 corresponds to C3-C10cycloalkylcarbonyl as defined above, wherein at least one CH2-group of the alkyl is replaced by O or NR14. Examples are




etc.

C2-C12alkoxycarbonyl is a linear or branched and is, for example, methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, n-butyloxycarbonyl, isobutyloxycarbonyl, 1,1-dimethylpropoxycarbonyl, pentyloxycarbonyl, hexyloxycarbonyl, heptyloxycarbonyl, octyloxycarbonyl, nonyloxycarbonyl, decyloxycarbonyl or dodecyloxycarbonyl, especially methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, n-butyloxycarbonyl or iso-butyloxycarbonyl, preferably methoxycarbonyl. C2-C6alkoxycarbonyl and C2-C4alkoxycarbonyl have the same meanings as given above for C2-C12alkoxycarbonyl up to the corresponding number of C-atoms.
C2-C12alkoxycarbonyl which is interrupted by one or more —O— is linear or branched. The number of atoms is from 1 to 5, for example 1 to 4, 1 to 3, 1 or 2. Two O-atoms are separated by at least two methylene groups, namely ethylene.
Phenyloxycarbonyl is




naphthyloxycarbonyl corresponds to





Substituted phenoxycarbonyl and naphthyloxycarbonyl radicals are substituted one to four times, for example one, two or three times, especially two or three times. Substituents on the phenyl ring are preferably in positions 4 or in 3,4-, 3,4,5-, 2,6-, 2,4- or 2,4,6-configuration on the phenyl ring, in particular in 4- or 3,4-configuration.
C3-C10cycloalkyloxycarbonyl corresponds to cycloalkyl as defined above, wherein the “yl” is attached to a —O(CO)-moiety. Examples are cyclohexyloxycarbonyl, cyclopentyloxycarbonyl,




as well as bridged or fused ring systems, e.g.





etc. are also meant to be covered.

C3-C10cycloalkyloxycarbonyl interrupted by O or NR14 corresponds to radicals as defined above, wherein at least one CH2-group of the alkyl is replaced by O or NR14. Examples are




etc.

C1-C6alkylene is linear or branched alkylene, for example methylene, ethylene, propylene, 1-methylethylene 1,1-dimethylethylene, butylene, 1-methylpropylene, 2-methyl-propylene, pentylene or hexylene.
C2-C6alkenylene is mono- or polyunsaturated and is, for example, ethenylene, 1-propenylene, 1-butenylene, 3-butenylene, 2-butenylene, 1,3-pentadienylene or 5-hexenylene.
Halogen is fluorine, chlorine, bromine and iodine, especially fluorine, chlorine and bromine, preferably fluorine and chlorine.
Heteroaryl is e.g. C1-C20heteroaryl and in the context of the present invention is meant to comprise either one ring or a multiple ring system, e.g. a fused ring-system, wherein one or more of the rings optionally are substituted, in particular by one or more C1-C20alkyl and/or C1-C20alkoxy. Examples are thienyl, benzo[b]thienyl, naphtho[2,3-b]thienyl, thianthrenyl, dibenzofuryl, chromenyl, xanthenyl, thioxanthyl, phenoxathiinyl, pyrrolyl, imidazolyl, pyrazolyl, pyrazinyl, pyrimidinyl, pyridazinyl, indolizinyl, isoindolyl, indolyl, indazolyl, purinyl, quinolizinyl, isoquinolyl, quinolyl, phthalazinyl, naphthyridinyl, quinoxalinyl, quinazolinyl, cinnolinyl, pteridinyl, carbazolyl, β-carbolinyl, phenanthridinyl, acridinyl, perimidinyl, phenanthrolinyl, phenazinyl, isothiazolyl, phenothiazinyl, isoxazolyl, furazanyl, phenoxazinyl, 7-phenanthryl, anthraquinone-2-yl (=9,10-dioxo-9,10-dihydroanthracen-2-yl), 3-benzo[b]thienyl, 5-benzo[b]thienyl, 2-benzo[b]thienyl, 4-dibenzofuryl, 4,7-dibenzofuryl, 4-methyl-7-dibenzofuryl, 2-xanthenyl, 8-methyl-2-xanthenyl, 3-xanthenyl, 2-phenoxyathiinyl, 2,7-phenoxathiinyl, 2-pyrrolyl, 3-pyrrolyl, 5-methyl-3-pyrrolyl, 2-imidazolyl, 4-imidazolyl, 5-imidazolyl, 2-methyl-4-imidazolyl, 2-ethyl-4-imidazolyl, 2-ethyl-5-imidazolyl, 3-pyrazolyl, 1-methyl-3-pyrazolyl, 1-propyl-4-pyrazolyl, 2-pyrazinyl, 5,6-dimethyl-2-pyrazinyl, 2-indolizinyl, 2-methyl-3-isoindolyl, 2-methyl-1-isoindolyl, 1-methyl-2-indolyl, 1-methyl-3-indolyl, 1,5-dimethyl-2-indolyl, 1-methyl-3-indazolyl, 2,7-dimethyl-8-purinyl, 2-methoxy-7-methyl-8-purinyl, 2-quinolizinyl, 3-isoquinolyl, 6-isoquinolyl, 7-isoquinolyl, 3-methoxy-6-isoquinolyl, 2-quinolyl, 6-quinolyl, 7-quinolyl, 2-methoxy-3-quinolyl, 2-methoxy-6-quinolyl, 6-phthalazinyl, 7-phthalazinyl, 1-methoxy-6-phthalazinyl, 1,4-dimethoxy-6-phthalazinyl, 1,8-naphthyridin-2-yl, 2-quinoxalinyl, 6-quinoxalinyl, 2,3-dimethyl-6-quinoxalinyl, 2,3-dimethoxy-6-quinoxalinyl, 2-quinazolinyl, 7-quinazolinyl, 2-dimethylamino-6-quinazolinyl, 3-cinnolinyl, 6-cinnolinyl, 7-cinnolinyl, 3-methoxy-7-cinnolinyl, 2-pteridinyl, 6-pteridinyl, 7-pteridinyl, 6,7-dimethoxy-2-pteridinyl, 2-carbazolyl, 3-carbazolyl, 9-methyl-2-carbazolyl, 9-methyl-3-carbazolyl, 3-carbolin-3-yl, 1-methyl-β-carbolin-3-yl, 1-methyl-β-carbolin-6-yl, 3-phenanthridinyl, 2-acridinyl, 3-acridinyl, 2-perimidinyl, 1-methyl-5-perimidinyl, 5-phenanthrolinyl, 6-phenanthrolinyl, 1-phenazinyl, 2-phenazinyl, 3-isothiazolyl, 4-isothiazolyl, 5-isothiazolyl, 2-phenothiazinyl, 3-phenothiazinyl, 10-methyl-3-phenothiazinyl, 3-isoxazolyl, 4-isoxazolyl, 5-isoxazolyl, 4-methyl-3-furazanyl, 2-phenoxazinyl or 10-methyl-2-phenoxazinyl.
C1-C20heteroaryl-(CO)O denote radicals as defined above, additionally bearing a COO as the bonding group.
C1-C20heteroaryl-S denote radicals as defined above, additionally bearing a S as the bonding group.
The terms “and/or” or “or/and” in the present context are meant to express that not only one of the defined alternatives (substituents) may be present, but also several of the defined alternatives (substituents) together, namely mixtures of different alternatives (substituents).
The term “at least” is meant to define one or more than one, for example one or two or three, preferably one or two.
The term “optionally substituted” means, that the radical to which it refers is either unsubstituted or substituted.
Throughout this specification and the claims which follow, unless the context requires otherwise, the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
If R2, R′2, R′′2 or R′′′2 forms a ring with one of the C-atoms of the phenyl or naphthyl ring to which the corresponding group




(CO)R′2 or (CO)R′′′2 is attached for example structures








wherein the radicals

R1, R2, R′′′2, R3, R4, R5, R6, R′6, R′′6, R7, R′7, R′′′6, R′′7, R′′′7, R8, R′8 and R9 are as defined above, are formed. The formed ring is unsubstituted or substituted. Substitutents are for example the radicals as defined for R9 above. In particular e.g. C3-C8cycloalkyl, C2-C5alkenyl, C1-C20alkoxy, C1-C20alkyl, phenyl, naphthyl, benzyloxy or phenoxy.
If R3, R4 or R5 as (CO)R′2, SR10, OR11, SOR10, SO2R10 or NR12R13 form a 5- or 6-membered ring via the radicals R10, R11, R12, R13 or R′2 with further substituents at the phenyl ring or with a C-atom of the phenyl ring, for example the following structures of the following kind are covered




etc.

If R′′6 and R′′7 in formula II together are C1-C6alkylene or C2-C6alkenylene to form a bicyclic ring together with the phenyl to which they are attached, wherein said bicyclic ring optionally is substituted, and provided that the group




is attached to either ring, for example structures of the following formula are defined:








etc., wherein the bicyclic ring system optionally has further substituents as defined above.

If R′′′6 and R′′′7 in formula III together are C2-C6alkylene or C2-C6alkenylene to form a bicyclic ring together with the phenyl to which they are attached, wherein said bicyclic ring, optionally substituted, and provided that one or more groups (CO)R′′2 are attached to either ring, for example structures of the following formula are defined:







etc., wherein the bicyclic ring system optionally has further substituents as defined above.

If R10 is phenyl or naphtyl which forms a 5- or 6-membered ring with the phenyl ring to which the SR10 is attached via a direct bond, C1-C4alkylene, O, S, NR14 or CO, wherein said phenyl or naphthyl is unsubstituted or substituted for example compounds with structures of the following kind are defined




etc., wherein the phenyl or naphthoyl optionally is further substituted.

If R12 and R13 independently of each other are C2-C5alkylene or C2-C5alkenylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR12R13 is attached, for examples structures of the following kind are defined,




etc., wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O or NR14:





etc.

If R12 and R13 independently of one another are phenyl which is attached via a direct bond to the phenyl ring on which the NR12R13 is for example compounds comprising the following structure are defined




If R12 and R13 together with the N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring which optionally is interrupted by O, N or NR14, saturated or unsaturated rings are formed, for example aziridine, pyrrole, pyrrolidine, imidazole, triazole, oxazole, pyridine, 1,3-diazine, 1,2-diazine, piperidine or morpholine.
If R12 and R13 together with the N-atom to which they are attached form a heteroaromatic ring system, said ring system is meant to comprise more than one ring, e.g. two or three rings, as well as one or more than one heteroatoms, from the same kind or different ones. Suitable heteroatoms are for example, N, S, O or P, in particular N, S or O. Examples are, carbazole, indole, isoindole, indazole, purine, isoquinoline, quinoline, carboline, phenothiazine etc.
If R16 and R17 together with N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring, which optionally is interrupted by O, S or NR14, saturated or unsaturated rings are formed, for example aziridine, pyrrole, thiazole, pyrrolidine, oxazole, pyridine, 1,3-diazine, 1,2-diazine, piperidine or morpholine.
If R16 and R17 independently of one another are C2-C5alkylene or C2-C5alkenylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR16R17 is attached, wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O or NR15, and to which C2-C5alkylene or C2-C5alkenylene optionally a benzene ring is condensed structures of the following kind are meant:




etc.

In the compounds of the formula I and III, the oxime group preferably is positioned para to the N-atom, i.e. in position 3 of the carbazole ring:




In the compounds of the formula II, the oxime group preferably is positioned para to the N-atom, i.e. in position 4 of the phenyl ring:




In the compounds of the formula III, the acyl group (CO)R′′′2 preferably is positioned para to the N-atom, i.e. in position 4 of the phenyl ring:




Interesting are the compounds of the formula III, wherein the oxime group and the acyl group (CO)R′′′2 preferably are positioned para to the N-atom:




R1 for example is phenyl, phenyl-C1-C4alkyl, C1-C20alkyl, in particular C1-C8alkyl or C2-C20alkyl which is interrupted by O or NR14; or R1 is C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14. Preferably R1 is C1-C20alkyl or C3-C10cycloalkyl which optionally is interrupted by O.
R2, R′2, R′′2 and R′′′2 for example independently of each other are C1-C20alkyl which optionally contains one or more C—C multiple bonds; C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14 and which uninterrupted or interrupted C3-C10cycloalkyl optionally contains one or more C—C multiple bonds; or are C1-C20alkyl substituted by halogen, OR11, phenyl, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, or




or R2 and R′2 are unsubstituted phenyl or naphthyl, in particular phenyl, or are phenyl or naphthyl, in particular phenyl, which is substituted by one or more C1-C12alkyl, phenyl, halogen, SR10, OR11 or NR12R13; wherein also the provisos as given above apply.

Preferably R2, R′2, R′′2 and R′′′2 are C1-C20alkyl which optionally contains one or more C—C multiple bonds; C1-C20alkyl substituted by halogen, OR11, phenyl, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, or




or are unsubstituted phenyl or phenyl, which is substituted by one or more C1-C12alkyl, SR10, OR11 or NR12R13, wherein also the provisos as given above apply. R′′2 in all cases additionally is





and R′′′2 in all cases additionally is





R3, R4, and R5 for example independently of one another are hydrogen, C1-C20alkyl,




C2-C20alkyl which is interrupted by O or NR14, phenyl-C1-C4alkyl or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14; phenyl which is unsubstituted or substituted by one or more SR10, OR11 or NR12R13; or R3, R4, and R5 are (CO)R′2, SR10, OR11, SOR10, SO2R10 or NR12R13; preferably R3, R4, and R5 for example independently of one another are hydrogen, C1-C20alkyl, (CO)R′2, SR10, OR11 or NR12R13.

R6, R′6, R7 and R′7 for example are hydrogen or C1-C20alkyl, in particular hydrogen and R8 for example is hydrogen, C1-C20alkyl or (CO)R′2, in particular hydrogen or (CO)R′2.
Interesting are the compounds of the formula II, wherein R′8 is the group hydrogen, C1-C20alkyl or (CO)R′2, in particular (CO)R′2 at the position para to the N-atom, i.e.




R′′6 and R′′7 for example are hydrogen or C1-C20alkyl, in particular hydrogen; or R′′6 and R′′7 in formula II together are C1-C6alkylene or C2-C6alkenylene to form a bicyclic ring together with the phenyl to which they are attached; provided that the group




is attached to either ring.

R′′′6 and R′′′7 for example are hydrogen or C1-C20alkyl, in particular hydrogen; or R′′′6 and R′′′7 in formula IIII together are C2-C6alkylene or C2-C6alkenylene to form a bicyclic ring together with the phenyl to which they are attached, provided that one or more groups (CO)R′′2 are attached to either ring.
R9 is for example hydrogen, C3-C8cycloalkyl, unsubstituted C1-C20alkyl or C1-C20alkyl which is substituted by phenyl or C1-C20alkylphenyl; or is phenyl or naphthyl, both of which are unsubstituted or substituted by one or more C1-C6alkyl, halogen, CN, OR11, SR10 and/or NR12R13; in particular R9 is C3-C8cycloalkyl, C1-C20alkyl or phenyl, preferably C1-C20alkyl.
R10 is preferably phenyl, or phenyl which forms a 5- or 6-membered ring with the phenyl ring to which the SR10 is attached via a direct bond, C1-C4alkylene, O, S, NR14 or CO, in particular via CO, wherein said phenyl is unsubstituted or substituted by one or more C1-C20alkyl.
If R10 is phenyl which forms a 5- or 6-membered ring with the phenyl ring to which the SR10 is attached via a CO, a thioxanthyl group is formed.
R11 is for example C1-C20alkyl, phenyl-C1-C4alkyl; C2-C20alkyl which is interrupted by one or more O; or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14; preferably C1-C20alkyl or C3-C10cycloalkyl which optionally is interrupted by O.
R12 and R13 for example are hydrogen, C1-C20alkyl, C2-C20alkyl which is interrupted by O or NR14, C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;

    or R12 and R13 are phenyl or naphthyl, in particular phenyl, each of which is unsubstituted or substituted by one or more (CO)R15, NR16R17, SR10, OR11 or C1-C20alkyl;
    or R12 and R13 independently of each other are C2-C5alkylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR12R13 is attached, wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O or NR14; or
    R12 and R13 independently of one another are phenyl which is attached via a direct bond to the phenyl ring on which the NR12R13 is positioned; or
    R12 and R13 together with the N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring which optionally is interrupted by O, N or NR14, in particular by O, and which ring is unsubstituted or substituted by one or more C1-C20alkyl, SR10, OR11, NR16R17 or (CO)R15; or
    R12 and R13 together with the N-atom to which they are attached form a heteroaromatic ring system, which heteroaromatic ring system is unsubstituted or substituted by one or more C1-C20alkyl, SR10, OR11, NR16R17 or (CO)R15.


The unsubstituted or substituted heteroaromatic ring system preferably is unsubstituted or substituted carbazole or unsubstituted or substituted indole.
R14 is for example hydrogen or C1-C20alkyl.
R15 for example is C1-C20alkyl, C2-C20alkyl which interrupted by O or NR14, or is phenyl or C3-C10cycloalkyl which optionally is interrupted by O; in particular C1-C20alkyl.
R16 and R17 independently of each other are for example hydrogen, C1-C20alkyl, C3-C10cycloalkyl or phenyl; or

    R16 and R17 together with N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring, which optionally is interrupted by O, S or NR14;
    or R16 and R17 independently of one another are C2-C5alkylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR16R17 is attached, wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O or NR15, and to which C2-C5alkylene or C2-C5alkenylene optionally a benzene ring is condensed; preferably R16 and R17 are C1-C20alkyl or are C2-C5alkylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR16R17 is attached, and to which C2-C5alkylene optionally a benzene ring is condensed.


R18, R19, R20, R′18, R′19, and R′20 independently of one another have one of the meanings as given for R6, R7, R8, R′6, R′7 and R′8; R′′18 and R′′19 independently of each other have one of the meanings as given for R′′6 and R′′7; and R′′′18 and R′′′19 independently of each another have one of the meanings as given for R′′′6 and R′′′7.
R21 is COOR11, CONR12R13, (CO)R9; or has one of the meanings as given for R15; that means it is COOR11, CONR12R13, (CO)R9, hydrogen, OH, C1-C20alkyl, C1-C4haloalkyl, C2-C20alkyl which interrupted by O, CO or NR14, C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or is phenyl-C1-C4alkyl, SR10, OR11 or NR12R13;

    or is phenyl or naphthyl, each of which is unsubstituted or substituted by one or more SR10, OR11, NR12R13,






     CN, NO2, halogen, C1-C20alkyl, C1-C4haloalkyl, C2-C20alkyl which is interrupted by O, CO or NR14 or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14.


R21 in particular is (CO)R9. Preferably, R9 in this radical denotes C1-C20alkyl.
R22 is COOR11, CONR12R13, (CO)R9; or has one of the meanings as given for R12 and R13; that means it is COOR11, CONR12R13, (CO)R9, hydrogen, C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, C2-C4hydroxyalkyl, C1-C12alkoxy, phenyl-C1-C4alkyl, (CO)R15, C2-C10alkoxyalkyl, C3-C5alkenyl, or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;

    or is phenyl or naphthyl, each of which is unsubstituted or substituted by one or more halogen, C1-C4haloalkyl, C1-C20alkoxy, (CO)R15, phenyl, NR16R17, SR10, OR11,






C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;

    or is C2-C5alkylene or C2-C5alkenylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR12R13 is attached, wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O, CO or NR14;
    R22 in particular is C1-C20alkyl or (CO)R9. Preferably, R9 in this radical denotes C1-C20alkyl.


X is O, S, SO or SO2; for example O or S, in particular O.
R24 is for example hydrogen, C1-C20alkyl; C2-C20alkenyl; C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14; C1-C20alkyl which is substituted by one or more halogen, OR11, COOR11, NR12R13, C5-C20heteroaryl, C5-C20heteroaryl-(CO)O, C5-C20heteroaryl-S, CONR12R13,




or phenyl;

    or R24 is phenyl, naphthyl, coumarinyl or heteroaryl, each of which optionally is substituted by one or more C1-C12alkyl, phenyl, halogen, C1-C4haloalkyl, CN, NO2, SR10, OR11, NR12R13 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
    or R24 forms a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group






     is attached, wherein said formed ring is unsubstituted or substituted.


Preferences for R23 are according to the ones as given for R9.
In the compounds of the formula I at least one of R3, R4 or R5 is other than hydrogen or C1-C20alkyl.
In the compounds of formula I, if one of R3, R4 or R5 in the para position of the phenyl ring is SR10 then R10 is not unsubstituted phenyl.
Interesting are compounds of the formula I, wherein, if one of R3, R4 or R5 is SR10 then R10 is not unsubstituted phenyl.
Further interesting are compounds of the formula I, wherein if one of R3, R4 or R5 in the para position of the phenyl ring is SR10 then R10 is not phenyl.
Other interesting compounds of the formula I are such, wherein if one of R3, R4 or R5 is SR10 then R10 is not phenyl.
In the compounds of formula I, if one of R3, R4 or R5 in the para position of the phenyl ring is NR12R13, then R12 and R13 are not both C1-C20alkyl.
Further interesting are compounds of the formula I, wherein if one of R3, R4 or R5 is NR12R13, then R12 and R13 are not both C1-C20alkyl.
In the compounds of formula I, if one of R3, R4 or R5 in the para position of the phenyl ring is NR12R13 and R12 and R13 together with the N-atom to which they are attached form a ring, said ring is not a morpholino ring.
Other interesting compounds of the formula I are such, wherein if one of R3, R4 or R5 is NR12R13 and R12 and R13 together with the N-atom to which they are attached form a ring, said ring is not a morpholino ring.
In the compounds of formula I, if R3 is hydrogen, R4 is C1-C20alkyl in the ortho-position of the phenyl ring and R5 is OR11 in the para-position of the phenyl ring, then R11 is not C3-C10cycloalkyl which is interrupted by O.
Interesting also are compounds of the formula Ia, as described below, wherein if R3 is hydrogen, R4 is C1-C20alkyl in the ortho-position of the phenyl ring and R5 is OR11 in the para-position of the phenyl ring, then R11 is not C3-C10cycloalkyl which is interrupted by O.
Interesting are the compounds of the formula I, II and III, wherein

    R1 is, C1-C20alkyl;
    R2 and R′2 independently of each other are C1-C20alkyl which C1-C20alkyl optionally contains one or more C—C multiple bonds;
    or R2 and R′2 are C1-C20alkyl which is substituted by one or more COOR11, C1-C20heteroaryl-S or






    or R2 and R′2 are unsubstituted phenyl or C1-C20heteroaryl; or are phenyl which is substituted by one or more C1-C12alkyl or SR10;
    or R2 and R′2 are






    or R2 and R′2 form a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group






     or (CO)R′2 is attached, wherein said formed ring is unsubstituted or substituted;
    R′′2 has one of the meanings given for R2 and R′2;
    R′′′2 has one of the meanings given for R2 and R′2 or is






    R3, R4, and R5 independently of one another are hydrogen,
    or R3, R4, and R5 are (CO)R′2, or NR12R13,
    R6, R7, R8, R′6, R′7, R′8, R′′6, R′′7, R′′′6 and R′′′7 independently of one another have one of the meanings as given for R3, R4 and R5;
    R9 is C1-C20alkyl;
    R10 is C1-C20heteroaryl;
    R11 is C1-C20alkyl;
    R12 and R13 together with the N-atom to which they are attached form a heteroaromatic ring system;
    R18, R19, R20, R′18, R′19, and R′20 are hydrogen,
    or R18, R19, R20, R′18, R′19, and R′20 are phenyl which is unsubstituted or substituted by one or more C1-C20alkyl;
    R21 is (CO)R9;
    R22 is, (CO)R9;
    X is O;
    X2 is a direct bond;
    m is an integer 1;
    R23 has one of the meanings as given for R9; and
    R24 is C1-C20alkyl; including the provisos (a)-(e) as defined above 1.


Preference is given to compounds of the formula I, II and III, wherein

    R1 is C1-C20alkyl or C3-C10cycloalkyl which optionally is interrupted by O;
    R2 and R′2 independently of each other are C1-C20alkyl which C1-C20alkyl optionally contains one or more C—C multiple bonds and which C1-C20alkyl optionally is substituted by one or more NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,






    or R2 and R′2 are NR12R13 or






    or R2 and R′2 form a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group






     or (CO)R′2 is attached, wherein said formed ring is unsubstituted or substituted;
    or R2 and R′2 are unsubstituted phenyl or C1-C20heteroaryl, or are phenyl or C1-C20heteroaryl which is substituted by C1-C12alkyl, OR11 and/or NR12R13;
    R′′2 has one of the meanings given for R2 and R′2;
    R′′′2 has one of the meanings given for R2 and R′2 or is






    R3, R4, and R5 independently of one another are hydrogen, C1-C20alkyl,
    or R3, R4, and R5 are (CO)R′2, SR10, OR11 or NR12R13;
    R6, R7, R8, R′6, R′7, R′8, R′′6, R′′7, R′′′6 and R′′′7 independently of one another have one of the meanings as given for R3, R4, and R5;
    R9 is C1-C20alkyl;
    R10 is phenyl which forms a 5- or 6-membered ring with the phenyl ring to which the SR10 is attached via CO, wherein said phenyl is unsubstituted or substituted by one or more C1-C20alkyl;
    R11 is C1-C20alkyl or C3-C10cycloalkyl which optionally is interrupted by O;
    R12 and R13 independently of one another are C1-C20alkyl, (CO)R15 or are phenyl which is unsubstituted or substituted by NR16R17,
    or R12 and R13 either independently of each other or both are C2-C5alkylene which is attached to one of the C-atoms of the phenyl ring to which the NR12R13 is attached; or
    R12 and R13 independently of one another are phenyl which is attached via a direct bond to the phenyl ring on which the NR12R13 is positioned; or
    R12 and R13 together with the N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring which optionally is interrupted by O or N; or
    R12 and R13 together with the N-atom to which they are attached form a heteroaromatic ring system, which heteroaromatic ring system is unsubstituted or substituted by one or more C1-C20alkyl or OR11;
    R15 is C1-C20alkyl;
    R16 and R17 independently of each other are C1-C20alkyl;
    or R16 and R17 independently of one another are C2-C5alkylene which is attached to one of the C-atoms of the phenyl ring to which the NR16R17 is attached, and to which C2-C5alkylene or C2-C5alkenylene optionally a benzene ring is condensed;
    R18, R19, R20, R′18, R′19, and R′20 independently of one another have one of the meanings as given for R6, R7, R8, R′6, R′7 and R′8;
    R′′18 and R′′19 independently of each other have one of the meanings as given for R′′6 and R′′7;
    R′′′18 and R′′′19 independently of each another have one of the meanings as given for R′′6 and R′′′7; and
    m, R21, R22, R23 and R24 are as defined in claim 1;
    provided that
    (a′) at least one of R2, R′2, R′′2 and R′′′2 is NR12R13 or






     or
    (b′) at least one of R2, R′2, R′′2 and R′′′2 forms a ring with one of the C-atoms of the phenyl or naphthyl ring to which the corresponding group






(CO)R′2 or (CO)R′′′2 is attached; or

    (c′) at least one of R2, R′2, R′′2 and R′′′2 contains one or more C—C multiple bonds; or
    (d′) at least one of R2, R′2, R′′2 and R′′′2 is C1-C20alkyl which is substituted by one or more C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S or






     or
    (e′) R′′′2 is an unsubstituted or substituted C1-C20heteroaryl.


Specific examples of preferable structures are shown by combination of the substituents in the tables below.










The preferences referring to the compounds of the formula I, II and III as given hereinbefore and in the context of the whole text, are intended not to refer to the compounds as such only, but to all categories of the claims. That is to the compositions, comprising the compounds of the formula I, II or III, to the photoinitiator mixtures comprising said compounds, as well as the use or process claims in which said compounds are employed.
Oxime esters of formula I, II and III are prepared by methods described in the literature, for example by reaction of the corresponding oximes with an acyl halide, in particular a chloride, or an anhydride in an inert solvent such as for example t-butyl methyl ether, tetrahydrofurane (THF) or dimethylformamide in the presence of a base, for example triethylamine or pyridine, or in a basic solvent such as pyridine. For example:




R1, R2, R′2, R′′2, R3, R4, R5, R6, R′6, R′′6, R′′′6, R7, R′7, R′′7, R′′7, R8, R′8 and R9 are as defined above, Hal means a halogen atom, in particular Cl.
R9 preferably is methyl.
Such reactions are well known to those skilled in the art, and are generally carried out at temperatures of −15 to +50° C., preferably 0 to 25° C.
Subject of the invention therefore is a process for the preparation of a compound of the formula I, II or III by reacting an oxime compound of formula Ia, IIa or IIIa




    wherein R1, R2, R′2, R′′2, R′′′2, R3, R4, R5, R6, R′6, R′′6, R′′′6, R7, R′7, R′′7, R′′′7, R8 and R′8 are as defined above; including the given provisos (a)-(e),
    with an acyl halide or an anhydride of formula V or VI






    wherein Hal denotes a halogen atom and R9 is as defined above, in the presence of a base or a mixture of bases.


The oximes required as starting materials can be obtained by a variety of methods described in standard chemistry textbooks (for instance in J. March, Advanced Organic Chemistry, 4th Edition, Wiley Interscience, 1992), or in specialized monographs, for example, S. R. Sandler & W. Karo, Organic functional group preparations, Vol. 3, Academic Press.
One of the most convenient methods is, for example, the reaction of aldehydes or ketones with hydroxylamine or its salt in polar solvents like dimethylacetamide (DMA), aqueous DMA, ethanol or aqueous ethanol. In that case, a base such as sodium acetate or pyridine is added to control the pH of the reaction mixture. It is well known that the rate of the reaction is pH-dependent, and the base can be added at the beginning or continuously during the reaction. Basic solvents such as pyridine can also be used as base and/or solvent or cosolvent. The reaction temperature is generally from room temperature to the refluxing temperature of the mixture, usually about 20-120° C.
The corresponding ketone intermediates are for example prepared by the methods described in the literature, for example in WO2005-080337A1 or JP2005-54012-A. Such reactions are well known to those skilled in the art.
Another convenient synthesis of oximes is the nitrosation of “active” methylene groups with nitrous acid or an alkyl nitrite. Both alkaline conditions, as described for example in Organic Syntheses coll. Vol. VI (J. Wiley & Sons, New York, 1988), pp 199 and 840, and acidic conditions, as described, for example, in Organic Synthesis coll. vol V, pp 32 and 373, coll. vol. III, pp 191 and 513, coll. vol. II, pp. 202, 204 and 363, are suitable for the preparation of the oximes used as starting materials in the invention. Nitrous acid is usually generated from sodium nitrite. The alkyl nitrite can be for example methyl nitrite, ethyl nitrite, isopropyl nitrite, butyl nitrite, or isoamyl nitrite.
Every oxime ester group can exist in two configurations, (Z) or (E). It is possible to separate the isomers by conventional methods, but it is also possible to use the isomeric mixture as such as photoinitiating species. Therefore, the invention also relates to mixtures of configurational isomers of compounds of the formula I, II and III.
Another subject of the invention are the compounds of the formula Ia, IIa and IIIa,




    wherein R1, R2, R′2, R′′2, R′′′2, R3, R4, R5, R6, R′6, R′′6, R′′′6, R7, R′7, R′′7, R′′′7, R8 and R′8 are as defined above; including the given provisos (a)-(e).


Another subject of the present invention therefore is a photopolymerizable composition comprising

    (a) at least one ethylenically unsaturated photopolymerizable compound and
    (b) as photoinitiator, at least one compound of the formula I, II or III as defined above.


The composition may comprise additionally to the photoinitiator (b) at least one further photoinitiator (c), and/or other additives (d).
The unsaturated compounds (a) may include one or more olefinic double bonds. They may be of low (monomeric) or high (oligomeric) molecular mass. Examples of monomers containing a double bond are alkyl, hydroxyalkyl, cycloalkyl (which optionally interrupted by O) or amino acrylates, or alkyl, hydroxyalkyl, cycloalkyl (which optionally interrupted by O) or amino methacrylates, for example methyl, ethyl, butyl, 2-ethylhexyl or 2-hydroxyethyl acrylate, tetrahydrofurfuryl acrylate, isobornyl acrylate, methyl methacrylate, cyclohexyl methacrylate or ethyl methacrylate. Silicone acrylates are also advantageous. Other examples are acrylonitrite, acrylamide, methacrylamide, N-substituted (meth)acrylamides, vinyl esters such as vinyl acetate, vinyl ethers such as isobutyl vinyl ether, styrene, alkyl- and halostyrenes, N-vinylpyrrolidone, vinyl chloride or vinylidene chloride.
Examples of monomers containing two or more double bonds are the diacrylates of ethylene glycol, propylene glycol, neopentyl glycol, hexamethylene glycol or of bisphenol A, and 4,4′-bis(2-acryl-oyloxyethoxy)diphenylpropane, trimethylolpropane triacrylate, pentaerythritol triacrylate or tetraacrylate, vinyl acrylate, divinylbenzene, divinyl succinate, diallyl phthalate, triallyl phosphate, triallyl isocyanurate or tris(2-acryloylethyl) isocyanurate.
Examples of polyunsaturated compounds of relatively high molecular mass (oligomers) are acrylated epoxy resins, polyesters containing acrylate-, vinyl ether- or epoxy-groups, and also polyurethanes and polyethers. Further examples of unsaturated oligomers are unsaturated polyester resins, which are usually prepared from maleic acid, phthalic acid and one or more diols and have molecular weights of from about 500 to 3000. In addition it is also possible to employ vinyl ether monomers and oligomers, and also maleate-terminated oligomers with polyester, polyurethane, polyether, polyvinyl ether and epoxy main chains. Of particular suitability are combinations of oligomers which carry vinyl ether groups and of polymers as described in WO 90/01512. However, copolymers of vinyl ether and maleic acid-functionalized monomers are also suitable. Unsaturated oligomers of this kind can also be referred to as prepolymers.
Particularly suitable examples are esters of ethylenically unsaturated carboxylic acids and polyols or polyepoxides, and polymers having ethylenically unsaturated groups in the chain or in side groups, for example unsaturated polyesters, polyamides and polyurethanes and co-polymers thereof, polymers and copolymers containing (meth)acrylic groups in side chains, and also mixtures of one or more such polymers.
Examples of unsaturated carboxylic acids are acrylic acid, methacrylic acid, crotonic acid, itaconic acid, cinnamic acid, and unsaturated fatty acids such as linolenic acid or oleic acid. Acrylic and methacrylic acid are preferred.
Suitable polyols are aromatic and, in particular, aliphatic and cycloaliphatic polyols. Examples of aromatic polyols are hydroquinone, 4,4′-dihydroxydiphenyl, 2,2-di(4-hydroxyphenyl)propane, and also novolaks and resols. Examples of polyepoxides are those based on the abovementioned polyols, especially the aromatic polyols, and epichlorohydrin. Other suitable polyols are polymers and copolymers containing hydroxyl groups in the polymer chain or in side groups, examples being polyvinyl alcohol and copolymers thereof or polyhydroxyalkyl methacrylates or copolymers thereof. Further polyols which are suitable are oligoesters having hydroxyl end groups.
Examples of aliphatic and cycloaliphatic polyols are alkylenediols having preferably 2 to 12 C atoms, such as ethylene glycol, 1,2- or 1,3-propanediol, 1,2-, 1,3- or 1,4-butanediol, pentanediol, hexanediol, octanediol, dodecanediol, diethylene glycol, triethylene glcyol, polyethylene glycols having molecular weights of preferably from 200 to 1500, 1,3-cyclopentanediol, 1,2-, 1,3- or 1,4-cyclohexanediol, 1,4-dihydroxymethylcyclohexane, glycerol, tris-(β-hydroxyethyl)amine, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol and sorbitol.
The polyols may be partially or completely esterified with one carboxylic acid or with different unsaturated carboxylic acids, and in partial esters the free hydroxyl groups may be modified, for example etherified or esterified with other carboxylic acids.
Examples of esters are:

    trimethylolpropane triacrylate, trimethylolethane triacrylate, trimethylolpropane trimeth-acrylate, trimethylolethane trimethacrylate, tetramethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol diacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol diacrylate, dipentaerythritol triacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, tripentaerythritol octaacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate, dipentaerythritol dimethacrylate, dipentaerythritol tetramethacrylate, tripentaerythritol octamethacrylate, pentaerythritol diitaconate, dipentaerythritol tris-itaconate, dipentaerythritol pentaitaconate, dipentaerythritol hexaitaconate, ethylene glycol diacrylate, 1,3-butanediol diacrylate, 1,3-butanediol dimethacrylate, 1,4-butanediol diitaconate, sorbitol triacrylate, sorbitol tetraacrylate, pentaerythritol-modified triacrylate, sorbitol tetra methacrylate, sorbitol pentaacrylate, sorbitol hexaacrylate, oligoester acrylates and methacrylates, glycerol diacrylate and triacrylate, 1,4-cyclohexane diacrylate, bisacrylates and bismethacrylates of polyethylene glycol with a molecular weight of from 200 to 1500, or mixtures thereof.


Also suitable as components (a) are the amides of identical or different, unsaturated carboxylic acids with aromatic, cycloaliphatic and aliphatic polyamines having preferably 2 to 6, especially 2 to 4, amino groups. Examples of such polyamines are ethylenediamine, 1,2- or 1,3-propylenediamine, 1,2-, 1,3- or 1,4-butylenediamine, 1,5-pentylenediamine, 1,6-hexylenediamine, octylenediamine, dodecylenediamine, 1,4-diaminocyclohexane, isophoronediamine, phenylenediamine, bisphenylenediamine, di-R-aminoethyl ether, diethylenetriamine, triethylenetetramine, di(R-aminoethoxy)- or di(R-aminopropoxy)ethane. Other suitable polyamines are polymers and copolymers, preferably with additional amino groups in the side chain, and oligoamides having amino end groups. Examples of such unsaturated amides are methylenebisacrylamide, 1,6-hexamethylenebisacrylamide, diethylenetriaminetrismethacrylamide, bis(methacrylamidopropoxy)ethane, R-methacrylamidoethyl methacrylate and N-[(β-hydroxyethoxy)ethyl]acrylamide.
Suitable unsaturated polyesters and polyamides are derived, for example, from maleic acid and from diols or diamines. Some of the maleic acid can be replaced by other dicarboxylic acids. They can be used together with ethylenically unsaturated comonomers, for example styrene. The polyesters and polyamides may also be derived from dicarboxylic acids and from ethylenically unsaturated diols or diamines, especially from those with relatively long chains of, for example 6 to 20 C atoms. Examples of polyurethanes are those composed of saturated or unsaturated diisocyanates and of unsaturated or, respectively, saturated diols.
Polymers with (meth)acrylate groups in the side chain are likewise known. They may, for example, be reaction products of epoxy resins based on novolaks with (meth)acrylic acid, or may be homo- or copolymers of vinyl alcohol or hydroxyalkyl derivatives thereof which are esterified with (meth)acrylic acid, or may be homo- and copolymers of (meth)acrylates which are esterified with hydroxyalkyl (meth)acrylates.
Other suitable polymers with acrylate or methacrylate groups in the side chains are, for example, solvent soluble or alkaline soluble polyimide precursors, for example poly(amic acid ester) compounds, having the photopolymerizable side groups either attached to the backbone or to the ester groups in the molecule, i.e. according to EP 624826. Such oligomers or polymers can be formulated with the new photoinitiators and optionally reactive diluents, like polyfunctional (meth)acrylates in order to prepare highly sensitive polyimide precursor resists.
The photopolymerizable compounds can be used alone or in any desired mixtures. It is preferred to use mixtures of polyol (meth)acrylates.
Examples of the component (a) are also polymers or oligomers having at least two ethylenically unsaturated groups and at least one carboxyl function within the molecule structure, such as a resin obtained by the reaction of a saturated or unsaturated polybasic acid anhydride with a product of the reaction of an epoxy compound and an unsaturated monocarboxylic acid, for example, photosensitive compounds as described in JP 6-1638 and JP 10301276 and commercial products such as EB9696, UCB Chemicals; KAYARAD TCR1025, Nippon Kayaku Co., LTD., or an addition product formed between a carboxyl group-containing resin and an unsaturated compound having an α,β-unsaturated double bond and an epoxy group (for example, ACA200M, Daicel Industries, Ltd.).
As diluent, a mono- or multi-functional ethylenically unsaturated compound, or mixtures of several of said compounds, can be included in the above composition up to 70% by weight based on the solid portion of the composition.
Subject of the invention also is a photopolymerizable composition as described above, wherein the component (a) is a resin obtained by the reaction of a saturated or unsaturated polybasic acid anhydride with a product of the reaction of an epoxy resin and an unsaturated monocarboxylic acid.
Such components are for example described in JP06-1938, JP08-278629, JP08-278630, JP10-301276, JP2001-40022, JP10-221843, JP11-231523, JP2002-206014-A or JP2006-53569-A, the disclosure of which hereby is incorporated by reference.
The unsaturated compounds (a) can also be used as a mixture with non-photopolymerizable, film-forming components. These may, for example, be physically drying polymers or solutions thereof in organic solvents, for instance nitrocellulose or cellulose acetobutyrate. They may also, however, be chemically and/or thermally curable (heat-curable) resins, examples being polyisocyanates, polyepoxides and melamine resins, as well as polyimide precursors. The use of heat-curable resins at the same time is important for use in systems known as hybrid systems, which in a first stage are photopolymerized and in a second stage are crosslinked by means of thermal aftertreatment.
The invention also provides compositions comprising as component (a) at least one ethylenically unsaturated photopolymerizable compound which is emulsified or dissolved in water. Many variants of such radiation-curable aqueous prepolymer dispersions are commercially available. A prepolymer dispersion is understood as being a dispersion of water and at least one prepolymer dispersed therein. The concentration of water in these systems is, for example, from 5 to 80% by weight, in particular from 30 to 60% by weight. The concentration of the radiation-curable prepolymer or prepolymer mixture is, for example, from 95 to 20% by weight, in particular from 70 to 40% by weight. In these compositions the sum of the percentages given for water and prepolymer is in each case 100, with auxiliaries and additives being added in varying quantities depending on the intended use.
The radiation-curable, film-forming prepolymers which are dispersed in water and are often also dissolved are aqueous prepolymer dispersions of mono- or polyfunctional, ethylenically unsaturated prepolymers which are known per se, can be initiated by free radicals and have for example a content of from 0.01 to 1.0 mol of polymerizable double bonds per 100 g of pre-polymer and an average molecular weight of, for example, at least 400, in particular from 500 to 10,000. Prepolymers with higher molecular weights, however, may also be considered depending on the intended application. Use is made, for example, of polyesters containing polymerizable C—C double bonds and having an acid number of not more than 10, of polyethers containing polymerizable C—C double bonds, of hydroxyl-containing reaction products of a polyepoxide, containing at least two epoxide groups per molecule, with at least one α,β-ethylenically unsaturated carboxylic acid, of polyurethane (meth)acrylates and of acrylic copolymers which contain α,β-ethylenically unsaturated acrylic radicals, as are described in EP 12339. Mixtures of these prepolymers can likewise be used. Also suitable are the polymerizable prepolymers described in EP 33896, which are thioether adducts of polymerizable prepolymers having an average molecular weight of at least 600, a carboxyl group content of from 0.2 to 15% and a content of from 0.01 to 0.8 mol of polymerizable C—C double bonds per 100 g of prepolymer. Other suitable aqueous dispersions, based on specific alkyl (meth)acrylate polymers, are described in EP 41125, and suitable waterdispersible, radiation-curable prepolymers of urethane acrylates can be found in DE 2936039. Further additives which may be included in these radiation-curable aqueous prepolymer dispersions are dispersion auxiliaries, emulsifiers, antioxidants, e.g. 2,2-thiobis(4-methyl-6-t-butylphenol) or 2,6-di-t-butylphenol, light stabilizers, dyes, pigments, fillers, such as glass or alumina, for example talc, gypsum, silicic acid, rutile, carbon black, zinc oxide, iron oxides, reaction accelerators, levelling agents, lubricants, wetting agents, thickeners, flatting agents, antifoams and other auxiliaries customary in paint technology. Suitable dispersion auxiliaries are water-soluble organic compounds which are of high molecular mass and contain polar groups, examples being polyvinyl alcohols, polyvinylpyrrolidone or cellulose ethers. Emulsifiers which can be used are nonionic emulsifiers and, if desired, ionic emulsifiers as well.
In certain cases it may be of advantage to use mixtures of two or more of the novel photoinitiators. It is of course also possible to use mixtures with known photoinitiators (c), for example mixtures with camphor quinone; benzophenone, benzophenone derivatives, such as 2,4,6-trimethylbenzophenone, 2-methylbenzophenone, 3-methylbenzophenone, 4-methylbenzophenone, 2-methoxycarbonylbenzophenone 4,4′-bis(chloromethyl)benzophenone, 4-chlorobenzophenone, 4-phenylbenzophenone, 3,3′-dimethyl-4-methoxy-benzophenone, [4-(4-methylphenylthio)phenyl]-phenylmethanone, methyl-2-benzoylbenzoate, 3-methyl-4′-phenylbenzophenone, 2,4,6-trimethyl-4′-phenylbenzophenone, 4,4′-bis(dimethylamino)benzophenone, 4,4′-bis(diethylamino)benzophenone; ketal compounds, as for example benzildimethylketal (IRGACURE® 651); acetophenone, acetophenone derivatives, for example α-hydroxycycloalkyl phenyl ketones, e.g. 2-hydroxy-2-methyl-1-phenyl-propanone (DAROCUR® 1173), 1-hydroxy-cyclohexyl-phenyl-ketone (IRGACURE® 184); 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propan-1-one (IRGACURE®2959); 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]-phenyl}-2-methyl-propan-1-one (IRGACURE® 127); 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-phenoxy]-phenyl}-2-methyl-propan-1-one; dialkoxyacetophenones, α-hydroxy- or α-aminoacetophenones, e.g. (4-methylthiobenzoyl)-1-methyl-1-morpholinoethane (IRGACURE® 907), (4-morpholinobenzoyl)-1-benzyl-1-dimethylaminopropane (IRGACURE® 369), (4-morpholinobenzoyl)-1-(4-methylbenzyl)-1-dimethylaminopropane (IRGACURE® 379), (4-(2-hydroxyethyl)aminobenzoyl)-1-benzyl-1-dimethylaminopropane), 2-benzyl-2-dimethylamino-1-(3,4-dimethoxyphenyl) butanone-1; 4-aroyl1,3-dioxolanes, benzoin alkyl ethers and benzil ketals, phenylglyoxalic esters and derivatives thereof, e.g. oxo-phenyl-acetic acid 2-(2-hydroxy-ethoxy)-ethyl ester, dimeric phenylglyoxalic esters, e.g. oxo-phenyl-acetic acid 1-methyl-2-[2-(2-oxo-phenylcetoxy)-propoxy]-ethyl ester (IRGACURE® 754); further oximeesters, e.g. 1,2-octanedione 1-[4-(phenylthio)phenyl]2-(O-benzoyloxime) (IRGACURE® OXE01), ethanone 1-[9-ethyl-6-(2-methylbenzoyl)-9Hcarbazol-3-yl]-1-(O-acetyloxime) (IRGACURE®-OXE02), 9H-thioxanthene-2-carboxaldehyde 9-oxo-2-(O-acetyloxime), peresters, e.g. benzophenone tetracarboxylic peresters as described for example in EP126541, monoacyl phosphine oxides, e.g. (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (DAROCUR® TPO), bisacylphosphine oxides, e.g. bis(2,6-dimethoxy-benzoyl)-(2,4,4-trimethyl-pentyl)phosphine oxide, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide (IRGACURE® 819), bis(2,4,6-trimethylbenzoyl)-2,4-dipentoxyphenylphosphine oxide, trisacylphosphine oxides, halomethyltriazines, e.g. 2-[2-(4-methoxyphenyl)-vinyl]-4,6-bis-trichloromethyl-[1,3,5]triazine, 2-(4-methoxyphenyl)-4,6-bis-trichloromethyl-[1,3,5]triazine, 2-(3,4-dimethoxy-phenyl)-4,6-bistri-chloromethyl-[1,3,5]triazine, 2methyl-4,6-bis-trichloromethyl-[1,3,5]triazine, hexaarylbisimidazole/coinitiators systems, e.g. ortho-chlorohexaphenyl-bisimidazole combined with 2-mercaptobenzthiazole, and 4,4′-bis(diethylamino)benzophenone ferrocenium compounds, or titanocenes, e.g. bis(cyclopentadienyl)-bis(2,6-difluoro-3-pyrryl-phenyl)titanium (IRGACURE®784). Further, borate compounds can be used as coinitiators. Where the novel photoinitiator systems are employed in hybrid systems, use is made, in addition to the novel free-radical hardeners, of cationic photoinitiators, of peroxide compounds, such as benzoyl peroxide (other suitable peroxides are described in U.S. Pat. No. 4,950,581 column 19, lines 17-25), of aromatic sulfonium-, phosphonium- or iodonium salts as described for example in U.S. Pat. No. 4,950,581, column 18, line 60 to column 19, line 10 or cyclopentadienyl-arene-iron(II) complex salts, for example (η6-iso-propylbenzene)(η5-cyclopentadienyl)iron(II) hexafluorophosphate, as well as oxime sulfonic acid esters, as are, for example described in EP780729. Also pyridinium and (iso)quinolinium salts as described e.g. in EP497531 and EP 441232 may be used in combination with the new photoinitiators.
The new photoinitiators, either alone or in mixtures with other known photoinitiators and sensitizers, can be used also in the form of a dispersion or emulsion in water or aqueous solutions.
Interesting are compositions comprising besides the compound of formula I, II and III at least one α-aminoketone, in particular (4-methylthiobenzoyl)-1-methyl-1-morpholinoethane or (4-morpholinobenzoyl)-1-(4-methylbenzyl)-1-dimethylaminopropane.
The photopolymerizable compositions generally comprise 0.005 to 25% by weight, preferably 0.01 to 20% by weight, in particular 0.01 to 15% by weight of the photoinitiator, based on the solid composition. The amount refers to the sum of all photoinitiators added, if mixtures of initiators are employed. Accordingly, the amount either refers to the photoinitiator (b) or the photoinitiators (b)+(c).
In addition to the photoinitiator the photopolymerizable mixtures may include various additives (d). Examples of these are thermal inhibitors, which are intended to prevent premature polymerization, examples being hydroquinone, hydroquinone derivatives, p-methoxyphenol, R-naphthol or sterically hindered phenols, such as 2,6-di-tert-butyl-p-cresol In order to increase the stability on storage in the dark it is possible, for example, to use copper compounds, such as copper naphthenate, stearate or octoate, phosphorus compounds, for example triphenylphosphine, tributylphosphine, triethyl phosphite, triphenyl phosphite or tribenzyl phosphite, quaternary ammonium compounds, for example tetramethylammonium chloride or trimethylbenzylammonium chloride, or hydroxylamine derivatives, for example N-diethyl-hydroxylamine. To exclude atmospheric oxygen during the polymerization it is possible to add paraffin or similar wax-like substances which, being of inadequate solubility in the polymer, migrate to the surface in the beginning of polymerization and form a transparent surface layer which prevents the ingress of air. It is also possible to apply an oxygen-impermeable layer on top of the coating, for example poly(vinylalcohol-co-vinylacetate). Light stabilizers which can be added in a small quantity are UV absorbers, for example those of the hydroxyphenylbenzotriazole, hydroxyphenyl-benzophenone, oxalamide or hydroxyphenyl-s-triazine type. These compounds can be used individually or in mixtures, with or without sterically hindered amines (HALS).
Examples of such UV absorbers and light stabilizers are

    1. 2-(2′-hydroxyphenyl)benzotriazoles for example 2-(2′-hydroxy-5′-methylphenyl)benzotriazole, 2-(3′,5′-di-tert-butyl-2′-hydroxyphenyl)benzotriazole, 2-(5′-tert-butyl-2′-hydroxyphenyl)benzotriazole, 2-(2′-hydroxy-5′-(1,1,3,3-tetramethylbutyl)phenyl)benzotriazole, 2-(3′,5′-di-tert-butyl-2′-hydroxyphenyl)-5-chlorobenzotriazole, 2-(3′-tert-butyl-2′-hydroxy-5′-methylphenyl)-5-chlorobenzotriazole, 2-(3′-sec-butyl-5′-tert-butyl-2′-hydroxyphenyl)benzotriazole, 2-(2′-hydroxy-4′-octoxyphenyl)benzotriazole, 2-(3′,5′-di-tert-amyl-2′-hydroxyphenyl)benzotriazole, 2-(3′,5′-bis-(α,α-dimethylbenzyl)-2′-hydroxyphenyl)-benzotriazole, mixture of 2-(3′-tert-butyl-2′-hydroxy-5′-(2-octyloxycarbonylethyl)phenyl)-5-chlorobenzotriazole, 2-(3′-tert-butyl-5′-[2-(2-ethyl-hexyl-oxy)carbonylethyl]-2′-hydroxyphenyl)-5-chlorobenzotriazole, 2-(3′-tert-butyl-2′-hydroxy-5′-(2-methoxycarbonylethyl)phenyl)-5-chlorobenzotriazole, 2-(3′-tert-butyl-2′-hydroxy-5′-(2-methoxycarbonylethyl)phenyl)-benzotriazole, 2-(3′-tert-butyl-2′-hydroxy-5′-(2-octyloxycarbonylethyl)phenyl)benzotriazole, 2-(3′-tert-butyl-5′-[2-(2-ethylhexyloxy)carbonylethyl]-2′-hydroxyphenyl)benzotriazole, 2-(3′-dodecyl-2′-hydroxy-5′-methylphenyl)benzotriazole, and 2-(3′-tert-butyl-2′-hydroxy-5′-(2-isooctyloxycarbonylethyl)phenylbenzothiazole, 2,2′-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-benzotriazol-2-yl-phenol]; transesterification product of 2-[3′-tert-butyl-5′-(2-methoxycarbonylethyl)-2′-hydroxy-phenyl]-benzotriazole with polyethylene glycol 300; [R—CH2CH2—COO(CH2)3]2— where R=3′-tert-butyl-4′-hydroxy-5′-2H-benzotriazol-2-yl-phenyl.
    2. 2-Hydroxybenzophenones, for example the 4-hydroxy-, 4-methoxy-, 4-octoxy-, 4-decyloxy-, 4-dodecyloxy-, 4-benzyloxy-, 4,2′,4′-trihydroxy- and 2′-hydroxy-4,4′-dimethoxy derivative.
    3. Esters of substituted or unsubstituted benzoicacids, for example 4-tert-butylphenyl salicylate, phenyl salicylate, octylphenyl salicylate, dibenzoylresorcinol, bis(4-tert-butylbenzoyl)resorcinol, benzoylresorcinol, 2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate, hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, octadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, and 2-methyl-4,6-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate.
    4. Acrylates, for example isooctyl or ethyl α-cyano-β,β-diphenyl acrylate, methyl α-carbomethoxycinnamate, butyl or methyl α-cyano-R-methyl-p-methoxycinnamate, methyl α-carboxymethoxy-p-methoxycinnamate and N—(R-carbomethoxy-R-cyanovinyl)-2-methylindoline.
    5. Sterically hindered amines, for example bis(2,2,6,6-tetramethylpiperidyl) sebacate, bis(2,2,6,6-tetramethylpiperidyl) succinate, bis(1,2,2,6,6-pentamethylpiperidyl) sebacate, bis-(1,2,2,6,6-pentamethylpiperidyl) n-butyl-3,5-di-tert-butyl-4-hydroxybenzylmalonate, condensation product of 1-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinic acid, condensation product of N,N′-bis-(2,2,6,6-tetramethyl-4-piperidyl)hexa-methylenediamine and 4-tert-octylamino-2,6-dichloro-1,3,5-s-triazine, tris-(2,2,6,6-tetramethyl-4-piperidyl) nitrilotriacetate, tetrakis-(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butane tetraoate, 1,1′-(1,2-ethanediyl)-bis(3,3,5,5-tetramethyl-piperazinone), 4-benzoyl-2,2,6,6-tetramethylpiperidine, 4-stearyloxy-2,2,6,6-tetramethylpiperidine, bis-(1,2,2,6,6-pentamethylpiperidyl) 2-n-butyl-2-(2-hydroxy-3,5-di-tert-butylbenzyl) malonate, 3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro-[4.5]decane-2,4-dione, bis-(1-octyloxy-2,2,6,6-tetramethylpiperidyl) sebacate, bis-(1-octyloxy-2,2,6,6-tetramethylpiperidyl) succinate, condensation product of N,N′-bis-(2,2,6,6-tetra-methyl-4-piperidyl)hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine, condensation product of 2-chloro-4,6-di-(4-n-butylamino-2,2,6,6-tetramethylpiperidyl)-1,3,5-triazine and 1,2-bis-(3-aminopropyl-amino)ethane, condensation product of 2-chloro-4,6-di-(4-n-butylamino-1,2,2,6,6-pentamethylpiperidyl)-1,3,5-triazine and 1,2-bis-(3-aminopropylamino)ethane, 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione, 3-dodecyl-1-(2,2,6,6-tetramethyl-4-piperidyl)pyrrolidine-2,5-dione and 3-dodecyl-1-(1,2,2,6,6-pentamethyl-4-piperidyl)-pyrrolidine-2,5-dione.
    6. Oxalamides, for example 4, 4′-dioctyloxyoxanilide, 2,2′-diethoxyoxanilide, 2,2′-dioctyloxy-5,5′-di-tert-butyloxanilide, 2,2′-didodecyloxy-5,5′ di-tert-butyloxanilide, 2-ethoxy-2′-ethyloxanilide, N,N′-bis-(3-dimethylaminopropyl)oxalamide, 2-ethoxy-5-tert-butyl-2′-ethyloxanilide and its mixture with 2-ethoxy-2′-ethyl-5,4′-di-tert-butyloxanilide, mixtures of o- and p-methoxy- and of o- and p-ethoxy-disubstituted oxanilides.
    7. 2-(2-Hydroxyphenyl)-1,3,5-triazines, for example 2,4,6-tris(2-hydroxy-4-octyloxyphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis-(2,4-dimethylphenyl)-1,3,5-triazine, 2-(2,4-dihydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2,4-bis(2-hydroxy-4-propyloxy-phenyl)-6-(2,4-dimethylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(4-methylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-dodecyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-[2-hydroxy-4-(2-hydroxy-3-butyloxy-propyloxy)phenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-[2-hydroxy-4-(2-hydroxy-3-octyloxy-propyloxy)phenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-[4-dodecyl/tridecyl-oxy-(2-hydroxypropyl)oxy-2-hydroxy-phenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine.
    8. Phosphites and phosphonites, for example triphenyl phosphite, diphenyl alkyl phosphites, phenyl dialkyl phosphites, tris(nonylphenyl) phosphite, trilauryl phosphite, trioctadecyl phosphite, distearyl pentaerythrityl diphosphite, tris-(2,4-di-tert-butylphenyl) phosphite, diisodecyl pentaerythrityl diphosphite, bis-(2,4-di-tert-butylphenyl) pentaerythrityl diphosphite, bis-(2,6-di-tert-butyl-4-methylphenyl) pentaerythrityl diphosphite, bis-isodecyloxy pentaerythrityl diphosphite, bis-(2,4-di-tert-butyl-6-methylphenyl) pentaerythrityl diphosphite, bis-(2,4,6-tri-tert-butylphenyl) pentaerythrityl diphosphite, tristearyl sorbityl triphosphite, tetra-kis(2,4-di-tert-butylphenyl)-4,4′-bi phenylene diphosphonite, 6-isooctyloxy-2,4,8,10-tetra-tert-butyl-12H-dibenzo[d,g]-1,3,2-dioxaphosphocine, 6-fluoro-2,4,8,10-tetra-tert-butyl-12-methyl-dibenzo[d,g]-1,3,2-dioxaphosphocine, bis-(2,4-di-tert-butyl-6-methylphenyl)methyl phosphite and bis(2,4-di-tert-butyl-6-methylphenyl)ethyl phosphite.


To accelerate the photopolymerization it is possible to add amines as component (d), for example triethanolamine, N-methyldiethanolamine, ethyl-p-dimethylaminobenzoate, 2-(dimethylamino)ethyl benzoate, 2-ethylhexyl-p-dimethylaminobenzoate, octyl-para-N,N-dimethyl-aminobenzoate, N-(2-hydroxyethyl)-N-methyl-para-toluidine or Michler's ketone. The action of the amines can be intensified by the addition of aromatic ketones of the benzophenone type. Examples of amines which can be used as oxygen scavengers are substituted N,N-dialkylanilines, as are described in EP339841. Other accelerators, coinitiators and autoxidizers are thiols, thioethers, disulfides, phosphonium salts, phosphine oxides or phosphines, as described, for example, in EP438123, in GB2180358 and in JP Kokai Hei 6-68309.
It is further possible to add chain transfer agents which are customary in the art to the compositions according to the invention as component (d). Examples are mercaptans, amines and benzothiazol.
Photopolymerization can also be accelerated by adding further photosensitizers or coinitiators (as component (d)) which shift or broaden the spectral sensitivity. These are, in particular, aromatic compounds, for example benzophenone and derivatives thereof, thioxanthone and derivatives thereof, anthraquinone and derivatives thereof, coumarin and phenothiazine and derivatives thereof, and also 3-(aroylmethylene)thiazolines, rhodanine, camphorquinone, but also eosine, rhodamine, erythrosine, xanthene, thioxanthene, acridine, e.g. 9-phenylacridine, 1,7-bis(9-acridinyl)heptane, 1,5-bis(9-acridinyl)pentane, cyanine and merocyanine dyes. Specific examples of such compounds are
1. Thioxanthones


    Thioxanthone, 2-isopropylthioxanthone, 2-chlorothioxanthone, 1-chloro-4-propoxythioxanthone, 2-dodecylthioxanthone, 2,4-diethylthioxanthone, 2,4-dimethylthioxanthone, 1-methoxy-carbonylthioxanthone, 2-ethoxycarbonylthioxanthone, 3-(2-methoxyethoxycarbonyl)-thioxanthone, 4-butoxycarbonylthioxanthone, 3-butoxycarbonyl-7-methylthioxanthone, 1-cyano-3-chlorothioxanthone, 1-ethoxycarbonyl-3-chlorothioxanthone, 1-ethoxycarbonyl-3-ethoxythioxanthone, 1-ethoxycarbonyl-3-aminothioxanthone, 1-ethoxycarbonyl-3-phenylsulfurylthioxanthone, 3,4-di-[2-(2-methoxyethoxy)ethoxycarbonyl]-thioxanthone, 1,3-dimethyl-2-hydroxy-9H-thioxanthen-9-one 2-ethylhexylether, 1-ethoxycarbonyl-3-(1-methyl-1-morpholinoethyl)-thioxanthone, 2-methyl-6-dimethoxymethyl-thioxanthone, 2-methyl-6-(1,1-dimethoxybenzyl)-thioxanthone, 2-morpholinomethylthioxanthone, 2-methyl-6-morpholinomethylthioxanthone, N-allylthioxanthone-3,4-dicarboximide, N-octylthioxanthone-3,4-dicarboximide, N-(1,1,3,3-tetramethylbutyl)-thioxanthone-3,4-dicarboximide, 1-phenoxythioxanthone, 6-ethoxycarbonyl-2-methoxythioxanthone, 6-ethoxycarbonyl-2-methylthioxanthone, thioxanthone-2-carboxylic acid polyethyleneglycol ester, 2-hydroxy-3-(3,4-dimethyl-9-oxo-9H-thioxanthon-2-yloxy)-N,N,N-trimethyl-1-propanaminium chloride;

2. Benzophenones

    benzophenone, 4-phenyl benzophenone, 4-methoxy benzophenone, 4,4′-dimethoxy benzophenone, 4,4′-dimethyl benzophenone, 4,4′-dichlorobenzophenone 4,4′-bis(dimethylamino)-benzophenone, 4,4′-bis(diethylamino)benzophenone, 4,4′-bis(methylethylamino)benzophenone, 4,4′-bis(p-isopropylphenoxy)benzophenone, 4-methyl benzophenone, 2,4,6-trimethylbenzophenone, 4-(4-methylthiophenyl)-benzophenone, 3,3′-dimethyl-4-methoxy benzophenone, methyl-2-benzoylbenzoate, 4-(2-hydroxyethylthio)-benzophenone, 4-(4-tolylthio)-benzophenone, 1-[4-(4-benzoyl-phenylsulfanyl)-phenyl]-2-methyl-2-(toluene-4-sulfonyl)-propan-1-one, 4-benzoyl-N,N,N-trimethylbenzenemethanaminium chloride, 2-hydroxy-3-(4-benzoylphenoxy)-N,N,N-trimethyl-1-propanaminium chloride monohydrate, 4-(13-acryloyl-1,4,7,10,13-pentaoxamidecyl)-benzophenone, 4-benzoyl-N,N-dimethyl-N-[2-(1-oxo-2-propenyl)oxy]ethyl-benzenemethanaminium chloride;

3. Coumarins

    Coumarin 1, Coumarin 2, Coumarin 6, Coumarin 7, Coumarin 30, Coumarin 102, Coumarin 106, Coumarin 138, Coumarin 152, Coumarin 153, Coumarin 307, Coumarin 314, Coumarin 314T, Coumarin 334, Coumarin 337, Coumarin 500, 3-benzoyl coumarin, 3-benzoyl-7-methoxycoumarin, 3-benzoyl-5,7-dimethoxycoumarin, 3-benzoyl-5,7-dipropoxycoumarin, 3-benzoyl-6,8-dichlorocoumarin, 3-benzoyl-6-chloro-coumarin, 3,3′-carbonyl-bis[5,7-di(propoxy)-coumarin], 3,3′-carbonyl-bis(7-methoxycoumarin), 3,3′-carbonyl-bis(7-diethylamino-coumarin), 3-isobutyroylcoumarin, 3-benzoyl-5,7-dimethoxy-coumarin, 3-benzoyl-5,7-diethoxy-coumanin, 3-benzoyl-5,7-dibutoxycoumarin, 3-benzoyl-5,7-di(methoxyethoxy)-coumarin, 3-benzoyl-5,7-di(allyloxy)coumarin, 3-benzoyl-7-dimethylaminocoumarin, 3-benzoyl-7-diethylaminocoumarin, 3-isobutyroyl-7-dimethylaminocoumarin, 5,7-dimethoxy-3-(1-naphthoyl)-coumarin, 5,7-diethoxy-3-(1-naphthoyl)-coumarin, 3-benzoylbenzo[f]coumarin, 7-diethylamino-3-thienoylcoumarin, 3-(4-cyanobenzoyl)-5,7-dimethoxycoumarin, 3-(4-cyanobenzoyl)-5,7-dipropoxycoumarin, 7-dimethylamino-3-phenylcoumarin, 7-diethylamino-3-phenylcoumarin, the coumarin derivatives disclosed in JP 09-179299-A and JP 09-325209-A, for example 7-[{4-chloro-6-(diethylamino)-S-triazine-2-yl}amino]-3-phenylcoumarin;

4. 3-(aroylmethylene)-thiazolines

    3-methyl-2-benzoylmethylene-β-naphthothiazoline, 3-methyl-2-benzoylmethylene-benzothiazoline, 3-ethyl-2-propionylmethylene-β-naphthothiazoline;

5. Rhodanines

    4-dimethylaminobenzalrhodanine, 4-diethylaminobenzalrhodanine, 3-ethyl-5-(3-octyl-2-benzothiazolinylidene)-rhodanine, the rhodanine derivatives, formulae [1], [2], [7], disclosed in JP 08-305019A;

6. Other Compounds

    acetophenone, 3-methoxyacetophenone, 4-phenylacetophenone, benzil, 4,4′-bis(dimethylamino)benzil, 2-acetylnaphthalene, 2-naphthaldehyde, dansyl acid derivatives, 9,10-anthraquinone, anthracene, pyrene, aminopyrene, perylene, phenanthrene, phenanthrenequinone, 9-fluorenone, dibenzosuberone, curcumin, xanthone, thiomichler's ketone, α-(4-dimethylaminobenzylidene) ketones, e.g. 2,5-bis(4-diethylaminobenzylidene)cyclopentanone, 2-(4-dimethylamino-benzylidene)-indan-1-one, 3-(4-dimethylamino-phenyl)-1-indan-5-yl-propenone, 3-phenylthiophthalimide, N-methyl-3,5-di(ethylthio)-phthalimide, N-methyl-3,5-di(ethylthio)-phthalimide, phenothiazine, methylphenothiazine, amines, e.g. N-phenylglycine, ethyl 4-dimethylaminobenzoate, butoxyethyl 4-dimethylaminobenzoate, 4-dimethylaminoacetophenone, triethanolamine, methyldiethanolamine, dimethylaminoethanol, 2-(dimethylamino)ethyl benzoate, poly(propylenegylcol)-4-(dimethylamino) benzoate.


A photopolymerizable composition, comprising as further additive (d) a photosensitizer compound selected from the group consisting of benzophenone and its derivatives, thioxanthone and its derivatives, anthraquinone and its derivatives, or coumarin derivatives is preferred.
The curing process can be assisted by adding photosensitizers, in particular, in compositions which are pigmented (for example with titanium dioxide), and also by adding a component which under thermal conditions forms free radicals, for example an azo compound such as 2,2′-azobis(4-methoxy-2,4-dimethylvaleronitrile), a triazene, diazo sulfide, pentazadiene or a peroxy compound, for instance a hydroperoxide or peroxycarbonate, for example t-butyl hydroperoxide, as described for example in EP245639.
The compositions according to the invention may comprise as further additive (d) a photoreducable dye, e.g., xanthene-, benzoxanthene-, benzothioxanthene, thiazine-, pyronine-, porphyrine- or acridine dyes, and/or trihalogenmethyl compounds which can be cleaved by irradiation. Similar compositions are for example described in EP445624.
Further additives known in the art may be added as component (d), as for example flow improvers, adhesion promoters, such as vinyltrimethoxysilane, vinyltriethoxysilane vinyltris-(2-methoxyethoxy)silane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane. Surfactants, optical brighteners, pigments, dyes, wetting agents, levelling assistants, dispersants, aggregation preventers, antioxidants or fillers are further examples for additives (d). In order to cure thick and pigmented coatings it is appropriate to add glass microspheres or pulverized glass fibres, as described for example in U.S. Pat. No. 5,013,768.
Further suitable components (d) are, as already mentioned above, surfactants and dispersants and other components, in particular to support the application of pigments or colorants in the formulation.
It is preferred to apply a surface treatment to the pigments in order to make the pigment easy to disperse and to stabilize the resultant pigment dispersion. The surface treatment reagents are, for example, surfactants, polymeric dispersants, general texture improving agents, pigment derivatives and mixtures thereof. It is especially preferred when the composition according to the invention comprises at least one polymeric dispersant and/or at least pigment derivative.
Suitable surfactants include anionic surfactants such as alkylbenzene- or alkylnaphthalene-sulfonates, alkylsulfosuccinates or naphthalene formaldehyde sulfonates; cationic surfactants including, for example, quaternary salts such as benzyl tributyl ammonium chloride; or nonionic or amphoteric surfactants such as polyoxyethylene surfactants and alkyl- or amidopropyl betaines, respectively.
Illustrative examples of the surfactant include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether and polyoxyethylene ° leyl ether; polyoxyethylene alkylphenyl ethers such as polyoxyethylene octylphenyl ether and polyoxyethylene nonylphenyl ether; polyethylene glycol diesters such as polyethylene glycol dilaurate and polyethylene glycol distearate; sorbitan fatty acid esters; fatty acid modified polyesters; tertiary amine modified polyurethanes; polyethyleneimines; those available under the trade names of KP (a product of Shin-Etsu Chemical Co., Ltd), Polyflow (a product of KYOEISHA CHEMICAL Co., Ltd), F-Top (a product of Tochem Products Co., Ltd), MEGAFAC (a product of Dainippon Ink & Chemicals, Inc.), Fluorad (a product of Sumitomo 3M Ltd), Asahi Guard and Surflon (products of Asahi Glass Co., Ltd); and the like.
These surfactants may be used alone or in admixture of two or more. The surfactant is generally used in an amount of 50 parts or less by weight, preferably 0 to 30 parts by weight, based on 100 parts by weight of the colorant composition.
Polymeric dispersants include high molecular weight polymers with pigment affinic groups. Examples are: statistical co-polymers comprised from, for instance, styrene derivatives, (meth)acrylates and (meth)acrylamides, and such statistical co-polymers modified by post modification; block co-polymers and/or comb polymers comprised from, for instance, styrene derivatives, (meth)acrylates and (meth)acrylamides, and such block co-polymers and/or comb polymers modified by post modification; polyethylenimines, which for instance is crafted with polyesters; polyamines, which for instance is crafted with polyesters; and many kinds of (modified) polyurethanes.
Polymeric dispersants may also be employed. Suitable polymeric dispersants are, for example, BYK's DISPERBYK® 101, 115, 130, 140, 160, 161, 162, 163, 164, 166, 168, 169, 170, 171, 180, 182, 2000, 2001, 2020, 2050, 2090, 2091, 2095, 2096, 2150, Ciba Specialty Chemicals' Ciba® EFKA® 4008, 4009, 4010, 4015, 4046, 4047, 4050, 4055, 4060, 4080, 4300, 4330, 4340, 4400, 4401, 4402, 4403, 4406, 4500, 4510, 4520, 4530, 4540, 4550, 4560, Ajinomoto Fine Techno's PB®711, 821, 822, 823, 824, 827, Lubrizol's SOLSPERSE® 1320, 13940, 17000, 20000, 21000, 24000, 26000, 27000, 28000, 31845, 32500, 32550, 32600, 33500, 34750, 36000, 36600, 37500, 39000, 41090, 44000, 53095 and combinations thereof.
It is preferred to use Ciba® EFKA® 4046, 4047, 4060, 4300, 4330, 4340, DISPERBYK® 161, 162, 163, 164, 165, 166, 168, 169, 170, 2000, 2001, 2020, 2050, 2090, 2091, 2095, 2096, 2105, 2150, PB®711, 821, 822, 823, 824, 827, SOLSPERSE® 24000, 31845, 32500, 32550, 32600, 33500, 34750, 36000, 36600, 37500, 39000, 41090, 44000, 53095 and combinations thereof as dispersant.
Suitable texture improving agents are, for example, fatty acids such as stearic acid or behenic acid, and fatty amines such as laurylamine and stearylamine. In addition, fatty alcohols or ethoxylated fatty alcohols polyols such as aliphatic 1,2-diols or epoxidized soy bean oil, waxes, resin acids and resin acid salts may be used for this purpose.
Suitable pigment derivatives are, for example, copper phthalocyanine derivatives such as Ciba Specialty Chemicals' Ciba® EFKA® 6745, Lubrizol's SOLSPERSE® 5000, 12000, BYK's Synergist 2100 and azo derivatives such as Ciba® EFKA® 6750, SOLSPERSE® 22000 and Synergist 2105.
The above mentioned dispersants and surfactants for pigments are for example employed in compositions of the present invention which are used as resist formulations, in particular in color filter formulations.
The choice of additive(s) (d) is made depending on the field of application and on properties required for this field. The additives described above are customary in the art and accordingly are added in amounts which are usual in the respective application.
Binders (e) as well can be added to the novel compositions. This is particularly expedient when the photopolymerizable compounds are liquid or viscous substances. The quantity of binder may, for example, be 2-98%, preferably 5-95% and especially 20-90%, by weight relative to the overall solids content. The choice of binder is made depending on the field of application and on properties required for this field, such as the capacity for development in aqueous and organic solvent systems, adhesion to substrates and sensitivity to oxygen.
Examples of suitable binders are polymers having a molecular weight of about 2,000 to 2,000,000, preferably 3,000 to 1,000,000. Examples of alkali developable binders are acrylic polymer having carboxylic acid function as a pendant group, such as conventionally known copolymers obtained by copolymerizing an ethylenic unsaturated carboxylic acid such as (meth)acrylic acid, 2-carboxyethyl (meth)acrylic acid, 2-carboxypropyl (meth)acrylic acid itaconic acid, crotonic acid, maleic acid, fumaric acid and ω-carboxypolycaprolactone mono(meth)acrylate, with one or more monomers selected from esters of (meth)acrylic acid, such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, benzyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, glycerol mono(meth)acrylate, tricyclo[5.2.1.02,6]decan-8-yl (meth)acrylate, glycidyl (meth)acrylate, 2-methylglycidyl (meth)acrylate, 3,4-epoxybutyl (meth)acrylate, 6,7-epoxyheptyl (meth)acrylate; vinyl aromatic compounds, such as styrene, α-methylstyrene, vinyltoluene, p-chlorostyrene, vinylbenzyl glycidyl ether; amide type unsaturated compounds, (meth)acrylamide diacetone acrylamide, N-methylolacrylamide, N-butoxymethacrylamide; and polyolefin type compounds, such as butadiene, isoprene, chloroprene and the like; methacrylonitrile, methyl isopropenyl ketone, mono-2-[(meth)acryloyloxy]ethyl succinate, N-phenylmaleimide, maleic anhydride, vinyl acetate, vinyl propionate, vinyl pivalate, polystyrene macromonomer, or polymethyl (meth)acrylate macromonomer. Examples of copolymers are copolymers of acrylates and methacrylates with acrylic acid or methacrylic acid and with styrene or substituted styrene, phenolic resins, for example novolak, (poly)hydroxystyrene, and copolymers of hydroxystyrene with alkyl acrylates, acrylic acid and/or methacrylic acid. Preferable examples of copolymers are copolymers of methyl methacrylate/methacrylic acid, copolymers of benzyl methacrylate/methacrylic acid, copolymers of methyl methacrylate/ethyl acrylate/methacrylic acid, copolymers of benzyl methacrylate/methacrylic acid/styrene, copolymers of benzyl methacrylate/methacrylic acid/hydroxyethyl methacrylate, copolymers of methyl methacrylate/butyl methacrylate/methacrylic acid/styrene, copolymers of methyl methacrylate/benzyl methacrylate/methacrylic acid/hydroxyphenyl methacrylate. Examples of solvent developable binder polymers are poly(alkyl methacrylates), poly(alkyl acrylates), poly(benzylmethacrylate-co-hydroxyethylmethacrylate-co-methacrylic acid), poly(benzylmethacrylate-co-methacrylic acid); cellulose esters and cellulose ethers, such as cellulose acetate, cellulose acetobutyrate, methylcellulose, ethylcellulose; polyvinylbutyral, polyvinylformal, cyclized rubber, polyethers such as polyethylene oxide, polypropylene oxide and polytetrahydrofuran; polystyrene, polycarbonate, polyurethane, chlorinated polyolefins, polyvinyl chloride, vinyl chloride/vinylidene copolymers, copolymers of vinylidene chloride with acrylonitrile, methyl methacrylate and vinyl acetate, polyvinyl acetate, copoly(ethylene/vinyl acetate), polymers such as polycaprolactam and poly(hexamethylene adipamide), and polyesters such as poly(ethylene glycol terephtalate) and poly(hexamethylene glycol succinate) and polyimide binder resins.
The polyimide binder resin in the present invention can either be a solvent soluble polyimide or a polyimide precursor, for example, a poly(amic acid).
Preferred is a photopolymerizable composition, comprising as binder polymer (e), a copolymer of methacrylate and methacrylic acid.
Interesting further are polymeric binder components as described e.g. in JP 10-171119-A, in particular for use in color filters.
The photopolymerizable compositions can be used for various purposes, for example as printing ink, e.g. screen printing inks, inks for offset- or flexo printing, as a clear finish, as a white or colored finish, for example for wood or metal, as powder coating, as a coating material, inter alia for paper, wood, metal or plastic, as a daylight-curable coating for the marking of buildings and roadmarking, for photographic reproduction techniques, for holographic recording materials, for image recording techniques or to produce printing plates which can be developed with organic solvents or with aqueous alkalis, for producing masks for screen printing, as dental filling compositions, as adhesives, as pressure-sensitive adhesives, as laminating resins, as etch resists, solder resists, electroplating resists, or permanent resists, both liquid and dry films, as photostructurable dielectric, for printed circuit boards and electronic circuits, as resists to manufacture color filters for a variety of display applications or to generate structures in the manufacturing process of plasma-display panels and electroluminescence displays, (as for example described in U.S. Pat. No. 5,853,446, EP863534, JP 09-244230-A, JP10-62980-A, JP08-171863-A, U.S. Pat. No. 5,840,465, EP855731, JP05-271576-A, JP 05-67405-A) for the production of holographic data storage (HDS) material, for the production of optical switches, optical lattices (interference lattice), light circuits, for producing three-dimensional articles by mass curing (UV curing in transparent moulds) or by the stereolithography technique, as is described, for example, in U.S. Pat. No. 4,575,330, to produce composite materials (for example styrenic polyesters, which may, if desired, contain glass fibres and/or other fibres and other auxiliaries) and other thick-layered compositions, for coating or sealing electronic components and integrated circuits, or as coatings for optical fibres, or for producing optical lenses, e.g. contact lenses or Fresnel lenses. The compositions according to the invention are further suitable for the production of medical equipment, auxiliaries or implants. Further, the compositions according to the invention are suitable for the preparation of gels with thermotropic properties, as for example described in DE19700064 and EP678534.
The novel photoinitiators may additionally be employed as initiators for emulsion polymerizations, pearl polymerizations or suspension polymerizations, as polymerization initiators for fixing ordered states of liquid-crystalline monomers and oligomers, or as initiators for fixing dyes on organic materials.
In coating materials, use is frequently made of mixtures of a prepolymer with polyunsaturated monomers, which may additionally include a monounsaturated monomer as well. It is the prepolymer here which primarily dictates the properties of the coating film, and by varying it the skilled worker is able to influence the properties of the cured film. The polyunsaturated monomer functions as a crosslinking agent which renders the film insoluble. The monounsaturated monomer functions as a reactive diluent, which is used to reduce the viscosity without the need to employ a solvent.
Unsaturated polyester resins are usually used in two-component systems together with a monounsaturated monomer, preferably with styrene. For photoresists, specific one-component systems are often used, for example polymaleimides, polychalcones or polyimides, as described in DE 2308830.
The novel photoinitiators and mixtures thereof can also be used for the polymerization of radiation-curable powder coatings. The powder coatings can be based on solid resins and monomers containing reactive double bonds, for example maleates, vinyl ethers, acrylates, acrylamides and mixtures thereof. A free-radically UV-curable powder coating can be formulated by mixing unsaturated polyester resins with solid acrylamides (for example methyl methylacrylamidoglycolate) and a novel free-radical photoinitiator, such formulations being as described, for example, in the paper “Radiation Curing of Powder Coating”, Conference Proceedings, Radtech Europe 1993 by M. Wittig and Th. Gohmann. The powder coatings can also contain binders, as are described, for example, in DE4228514 and in EP636669. Free-radically UV-curable powder coatings can also be formulated by mixing unsaturated polyester resins with solid acrylates, methacrylates or vinyl ethers and with a novel photoinitiator (or photoinitiator mixture). The powder coatings may also comprise binders as are described, for example, in DE4228514 and in EP636669. The UV-curable powder coatings may additionally comprise white or coloured pigments. For example, preferably rutiletitanium dioxide can be employed in concentrations of up to 50% by weight in order to give a cured powder coating of good hiding power. The procedure normally comprises electrostatic or tribostatic spraying of the powder onto the substrate, for example metal or wood, melting of the powder by heating, and, after a smooth film has formed, radiation-curing of the coating with ultraviolet and/or visible light, using for example medium-pressure mercury lamps, metal halide lamps or xenon lamps. A particular advantage of the radiation-curable powder coatings over their heat-curable counterparts is that the flow time after melting the powder particles can be delayed in order to ensure the formation of a smooth, high-gloss coating. In contrast to heat-curable systems, radiation-curable powder coatings can be formulated to melt at lower temperatures without the unwanted effect of shortening their lifetime. For this reason, they are also suitable as coatings for heat-sensitive substrates, for example wood or plastics. In addition to the novel photoinitiator systems, the powder coating formulations may also include UV absorbers. Appropriate examples are listed above in sections 1.-8.
The novel photocurable compositions are suitable, for example, as coating materials for substrates of all kinds, for example wood, textiles, paper, ceramics, glass, plastics such as polyesters, polyethylene terephthalate, polyolefins or cellulose acetate, especially in the form of films, and also metals such as Al, Cu, Ni, Fe, Zn, Mg or Co and GaAs, Si or SiO2 to which it is intended to apply a protective layer or, by means of imagewise exposure, to generate an image.
The novel radiation-sensitive compositions further find application as negative resists, having a very high sensitivity to light and being able to be developed in an aqueous alkaline medium without swelling. They are suitable for the production of printing forms for relief printing, planographic printing, photogravure or of screen printing forms, for the production of relief copies, for example for the production of texts in braille, for the production of stamps, for use in chemical milling or as a microresist in the production of integrated circuits. The compositions further may be used as photopatternable dielectric layer or coating, encapsulating material and isolating coating in the production of computer chips, printed boards and other electric or electronic components. The possible layer supports, and the processing conditions of the coating substrates, are just as varied.
The novel composition also relates to a photosensitive thermosetting resin composition and a method of forming a solder resist pattern by the use thereof, and more particularly relates to a novel photosensitive thermosetting resin composition useful as materials for the production of printed circuit boards, the precision fabrication of metallic articles, the etching of glass and stone articles, the relief of plastic articles, and the preparation of printing plates and particularly useful as a solder resist for printed circuit boards and to a method of forming a solder resist pattern by the steps of exposing a layer of the resin composition selectively to an actinic ray through a photomask having a pattern and developing the unexposed part of the layer.
The solder resist is a substance which is used during the soldering of a given part to a printed circuit board for the purpose of preventing molten solder from adhering to irrelevant portions and protecting circuits. It is, therefore, required to possess such properties as high adhesion, insulation resistance, resistance to soldering temperature, resistance to solvents, resistance to alkalis, resistance to acids, and resistance to plating.
Because the photocurable compositions according to the invention have a good thermal stability and are sufficiently resistant to inhibition by oxygen, they are particularly suitable for the production of color filters or color mosaic systems, such as described, for example, in EP 320 264. Color filters usually are employed in the manufacturing of flat panel displays such as LCD's, PDP (plasma panel display), EL (electroluminessence) display, and projection systems, image sensors, CCD (charge coupled device), and CMOS (complementary metal oxide semiconductor) sensors for scanner, digital camera and video camera.
The color filters usually are prepared by forming red, green and blue pixels and a black matrix on a glass substrate. In these processes photocurable compositions according to the invention can be employed. A particularly preferred method of use comprises adding of the coloring matters, dyes and pigments of red, green and blue colors to the light-sensitive resin composition of the present invention, coating of the substrate with the composition, drying of the coating with a short heat treatment, patternwise exposure of the coating to actinic radiation and subsequent development of the pattern in an aqueous alkaline developer solution and optionally a heat treatment. Thus, by subsequently applying a red, green and blue pigmented coating, in any desired order, on top of each other with this process a color filter layer with red, green and blue color pixels can be produced.
The development is carried out by washing out the areas which were not polymerized with a suitable alkali developing solution. This process is repeated to form the image having plural colors.
In the light-sensitive resin composition of the present invention, with a process in which at least one or more picture elements are formed on a transparent substrate and then an exposure is given from a side of the transparent substrate, on which the above picture elements are not formed, the above picture elements can be utilized as a light-shielding mask. In this case, for example, in the case where an overall exposure is given, a position adjustment of a mask gets unnecessary and a concern on a position slippage thereof is removed. And, it is possible to cure all of the part on which the above picture elements are not formed. Further, in this case, it is possible as well to develop and remove a part of the portion on which the above picture elements are not formed by using partially a light-shielding mask.
Since in either case, no gap is formed between the picture elements which are formed formerly and those which are formed later, the composition of the present invention is suitable for, for example, a forming material for a color filter. To be concrete, the coloring matters, dyes and pigments of red, green and blue colors are added to the light-sensitive resin composition of the present invention, and the processes for forming an image are repeated to form the picture elements of red, green and blue colors. Then, the light-sensitive resin composition to which, for example, the black coloring materials, dyes and pigments are added is provided on an overall face. An overall exposure (or a partial exposure via a light-shielding mask) can be provided thereon to form the picture elements of a black color all over the spaces (or all but a partial region of the light-shielding mask) between the picture elements of red, green and blue colors.
In addition to a process in which the light-sensitive resin composition is coated on a substrate and dried, the light-sensitive resin composition of the present invention can be used as well for a layer transfer material. That is, the light-sensitive resin composition is layer-wise provided directly on a temporary support, preferably on a polyethylene terephthalate film, or on a polyethylene terephthalate film on which an oxygen-shielding layer and a peeling layer or the peeling layer and the oxygen-shielding layer are provided. Usually, a removable cover sheet made of a synthetic resin is laminated thereon for a protection in handling. Further, there can be applied as well a layer structure in which an alkali soluble thermoplastic resin layer and an intermediate layer are provided on a temporary support and further a light-sensitive resin composition layer is provided thereon (JP 5-173320-A).
The above cover sheet is removed in use and the light-sensitive resin composition layer is laminated on a permanent support. Subsequently, peeling is carried out between those layer and a temporary support when an oxygen-shielding layer and a peeling layer are provided, between the peeling layer and the oxygen-shielding layer when the peeling layer and the oxygen-shielding layer are provided, and between the temporary support and the light-sensitive resin composition layer when either the peeling layer or the oxygen-shielding layer is not provided, and the temporary support is removed.
A metal support, glass, ceramics, and a synthetic resin film can be used as a support for a color filter. Glass and a synthetic resin film which is transparent and have an excellent dimension stability is particularly preferred.
The thickness of the light-sensitive resin composition layer is usually 0.1 to 50 micrometers, in particular 0.5 to 5 micrometers.
A diluted aqueous solution of an alkaline substance can be used as a developing solution for the light-sensitive resin composition of the present invention if the composition contains alkali soluble resin or alkali soluble monomers or oligomers, and further a developer solution prepared by adding a small amount of a water-miscible organic solvent thereto is included as well.
Examples of suitable alkaline materials include alkali metal hydroxides (for example, sodium hydroxide and potassium hydroxide), alkali metal carbonates (for example, sodium carbonate and potassium carbonate), alkali metal bicarbonates (for example, sodium bicarbonate and potassium bicarbonate), alkali metal silicates (for example, sodium silicate and potassium silicate), alkali metal metasilicates (for example, sodium metasilicate and potassium metasilicate), triethanolamine, diethanolamine, monoethanolamine, morpholine, tetraalkylammonium hydroxides (for example, tetramethylammonium hydroxide), or trisodium phosphate. The concetration of the alkaline substance is 0.01 to 30 weight %, and pH is preferably 8 to 14.
Suitable organic solvents which are miscible with water include methanol, ethanol, 2-propanol, 1-propanol, butanol, diacetone alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-butyl ether, diethyleneglycol dimethyl ether, propyleneglycol monomethyl ether acetate, ethyl-3-ethoxypropionate, methyl-3-methoxypropionate, n-butyl acetate, benzyl alcohol, acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone, 2-pentanone, epsilon-caprolactone, gamma-butylolactone, dimethylformamide, dimethylacetoamide, hexamethylphosphoramide, ethyl lactate, methyl lactate, epsilon-caprolactam, and N-methyl-pyrrolidinone. The concentration of the organic solvent which is miscible with water is 0.1 to 30 weight %.
Further, a publicly known surface active agent can be added. The concentration of the surface active agent is preferably 0.001 to 10 weight %.
The light sensitive resin composition of the present invention can also be developed with organic solvents, including blends of two or more solvents, not containing alkaline compounds. Suitable solvents include methanol, ethanol, 2-propanol, 1-propanol, butanol, diacetone alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-butyl ether, diethyleneglycol dimethyl ether, propyleneglycol monomethyl ether acetate, ethyl-3-ethoxypropionate, methyl-3-methoxypropionate, n-butyl acetate, benzyl alcohol, acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone, 2-pentanone, epsilon-caprolactone, gamma-butylolactone, dimethylformamide, dimethylacetamide, hexamethylphosphoramide, ethyl lactate, methyl lactate, epsilon-caprolactam, and N-methylpyrrolidinone. Optionally, water can be added to these solvents up to a level at which still a clear solution is obtained and at which sufficient solubility of the unexposed areas of the light sensitive composition is maintained.
The developer solution can be used in all forms known to the person skilled in the art, for example in form of a bath solution, puddle, or a spraying solution. In order to remove the non-cured portion of the light-sensitive resin composition layer, there can be combined the methods such as rubbing with a rotary brush and rubbing with a wet sponge. Usually, the temperature of the developing solution is preferably at and around room temperature to 40° C. The developing time is changeable according to the specific kind of the light-sensitive resin composition, the alkalinity and temperature of the developing solution, and the kind and concentration of the organic solvent in the case where it is added. Usually, it is 10 seconds to 2 minutes. It is possible to put a rinsing step after the development processing.
A final heat treatment is preferably carried out after the development processing. Accordingly, a support having a layer which is photopolymerized by exposing (hereinafter referred to as a photocured layer) is heated in an electric furnace and a drier, or the photocured layer is irradiated with an infrared lamp or heated on a hot plate. The heating temperature and time depend on the composition used and the thickness of the formed layer. In general, heating is preferably applied at about 120° C. to about 250° C., for about 5 to about 60 minutes.
The pigment which can be comprised in the composition according to the present invention, including a pigmented color filter resist composition, is preferably a processed pigment, for example a powdery or pasty product prepared by finely dispersing a pigment into at least one resin selected from the group consisting of acrylic resin, vinyl chloride-vinyl acetate copolymer, maleic acid resin and ethyl cellulose resin.
The red pigment comprises, for example, an anthraquinone type pigment alone, a diketopyrolopyrole type pigment alone, a mixture of them or a mixture consisting of at least one of them and a disazo type yellow pigment or an isoindoline type yellow pigment, in particular C. I. Pigment Red 177 alone, C. I. Pigment Red 254 alone, a mixture of C. I. Pigment Red 177 and C. I. Pigment Red 254 or a mixture consisting of at least one member of C. I. Pigment Red 177 and C. I. Pigment Red 254, and C. I. Pigment Yellow 83 or C. I. Pigment Yellow 139 (“CI” refers to the Color Index, known to the person skilled in the art and publicly available).
Further suitable examples for the pigment are C.I. Pigment Red 9, 97, 105, 122, 123, 144, 149, 168, 176, 179, 180, 185, 202, 207, 209, 214, 222, 242, 244, 255, 264, 272 and C.I. Pigment Yellow 12, 13, 14, 17, 20, 24, 31, 53, 55, 93, 95, 109, 110, 128, 129, 138, 139, 150, 153, 154, 155, 166, 168, 185, 199, 213 and C.I. Pigment Orange 43.
Examples of the dyes for red color are C. I. Solvent Red 25, 27, 30, 35, 49, 83, 89, 100, 122, 138, 149, 150, 160, 179, 218, 230, C. I. Direct Red 20, 37, 39, 44, and C. I. Acid Red 6, 8, 9, 13, 14, 18, 26, 27, 51, 52, 87, 88, 89, 92, 94, 97, 111, 114, 115, 134, 145, 151, 154, 180, 183, 184, 186, 198, C. I. Basic Red 12, 13, C. I. Disperse Red 5, 7, 13, 17 and 58. The Red dyes can be used in combination with yellow and/or orange dyes.
The green pigment comprises for instance a halogenated phthalocyanine type pigment alone or its mixture with a disazo type yellow pigment, an quinophthalone type yellow pigment or a metal complex, in particular C. I. Pigment Green 7 alone, C. I. Pigment Green 36 alone, or a mixture consisting of at least one member of C. I. Pigment Green 7, C. I. Pigment Green 36 and C. I. Pigment Yellow 83, C. I. Pigment Yellow 138 or C. I. Pigment Yellow 150. Other suitable green pigments are C.I. Pigment Green 15, 25 and 37.
Examples for suitable green dyes are C. I. Acid Green 3, 9, 16, C. I. Basic Green 1 and 4.
Examples for suitable blue pigments are phthalocyanine type pigments, used either alone or in combination with an dioxazine type violet pigment, for instance, C. I. Pigment Blue 15:6 alone, a combination of C. I. Pigment Blue 15:6 and C. I. Pigment Violet 23. Further examples for blue pigments are such of C. I. Pigment Blue 15:3, 15:4, 16, 22, 28 and 60. Other suitable pigments are C. I. Pigment Violet 14, 19, 23, 29, 32, 37, 177 and C. I. Orange 73.
Examples for suitable blue dyes are C. I. Solvent Blue 25, 49, 68, 78, 94, C. I. Direct Blue 25, 86, 90, 108, C. I. Acid Blue 1, 7, 9, 15, 103, 104, 158, 161, C. I. Basic Blue 1, 3, 9, 25, and C. I. Disperse Blue 198.
The pigment of the photopolymeric composition for black matrix preferably comprises at least one member selected from the group consisting of carbon black, titanium black and iron oxide. However, a mixture of other pigments which, in total, give the black appearance, can also be used. For example, also C. I. Pigment Black 1, 7 and 31 can be used alone or in combination.
Other examples of the dyes used for color filter are C. I. Solvent Yellow 2, 5, 14, 15, 16, 19, 21, 33, 56, 62, 77, 83, 93, 162, 104, 105, 114, 129, 130, 162, C. I. Disperse Yellow 3, 4, 7, 31, 54, 61, 201, C. I. Direct Yellow 1, 11, 12, 28, C. I. Acid Yellow 1, 3, 11, 17, 23, 38, 40, 42, 76, 98, C. I. Basic Yellow 1, C. I. Solvent Violet 13, 33, 45, 46, C. I. Disperse Violet 22, 24, 26, 28, C. I. Acid Violet 49, C. I. Basic Violet 2, 7, 10, C. I. Solvent Orange 1, 2, 5, 6, 37, 45, 62, 99, C. I. Acid Orange 1, 7, 8, 10, 20, 24, 28, 33, 56, 74, C. I. Direct Orange 1, C. I. Disperse Orange 5, C. I. Direct Brown 6, 58, 95, 101, 173, C. I. Acid Brown 14, C. I. Solvent Black 3, 5, 7, 27, 28, 29, 35, 45 and 46.
In some special cases of manufacturing color filters, complementary colors, yellow, magenta, cyan and optionally green, are used instead of red, green and blue. As yellow for this type of color filters, the abovementioned yellow pigments and dyes can be employed. Examples of the colorants suitable for magenta color are C. I. Pigment Red 122, 144, 146, 169, 177, C. I. Pigment Violet 19 and 23. Examples of cyan color are aluminum phthalocyanine pigments, titanium phthalocyanine pigments, cobalt phthalocyanine pigments, and tin phthalocyanine pigments.
For any color, combinations of more than two pigments can also be used. Especially suitable in color filter applications are powdery processed pigments prepared by finely dispersing the above mentioned pigments into a resin.
The concentration of the pigment in the total solid component (pigments of various colors and resin) is for example in the range of 5% to 80% by weight, in particular in the range of 20% to 45% by weight.
The pigments in the color filter resist composition have preferably a mean particle diameter smaller than the wavelength of visible light (400 nm to 700 nm). Particularly preferred is a mean pigment diameter of <100 nm.
If necessary, the pigments may be stabilized in the photosensitive composition by pretreatment of the pigments with a dispersant to improve the dispersion stability of the pigment in the liquid formulation. Suitable additives are described above.
Preferably, the color filter resist composition according to the present invention contains additionally at least one addition polymerizable monomeric compound as component (a).
The ethylenically unsaturated compounds (a) include one or more olefinic double bonds. They may be of low (monomeric) or high (oligomeric) molecular mass. Examples of compounds containing a double bond are (meth)acrylic acid, alkyl, hydroxyalkyl or aminoalkyl (meth)acrylates, for example methyl, ethyl, n-butyl, isobutyl, tert-butyl, n-propyl, isopropyl, n-hexyl, cyclohexyl, 2-ethylhexyl, isobornyl, benzyl, 2-hydroxyethyl, 2-hydroxypropyl, methoxyethyl, ethoxyethyl, glycerol, phenoxyethyl, methoxydiethylene glycol, ethoxydiethylene glycol, polyethylene glycol, polypropylene glycol, glycidyl, N,N-dimethylaminoethyl, and N,N-diethylaminoethyl (meth)acrylates. Other examples are (meth)acrylonitrile, (meth)acrylamide, N-substituted (meth)acrylamides such as N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N,N-dibutyl (meth)acrylamide, N-methyl (meth)acrylamide, N-ethyl (meth)acrylamide, N-butyl (meth)acrylamide, and N-(meth)acryloylmorpholine, vinyl esters such as vinyl acetate, vinyl ethers such as isobutyl vinyl ether, styrene, alkyl-, hydroxy- and halostyrenes, N-vinylpyrrolidone, N-vinylcaprolactam, N-vinylacetoamide, N-vinylformamide, vinyl chloride and vinylidene chloride.
Examples of polyunsaturated compounds of relatively high molecular mass (oligomers) are polyesters, polyurethanes, polyethers and polyamides, which contain ethylenically unsaturated carboxylates.
Particularly suitable examples are esters of an ethylenically unsaturated carboxylic acid with a polyol or polyepoxide.
Examples of unsaturated carboxylic acids are acrylic acid, methacrylic acid, crotonic acid, itaconic acid, cinnamic acid, and unsaturated fatty acids such as linolenic acid or oleic acid. Acrylic and methacrylic acids are preferred.
Suitable polyols are aromatic, in particular, aliphatic and cycloaliphatic polyols. Examples of aromatic polyols are hydroquinone, 4,4′-dihydroxydiphenyl, 2,2-bis(4-hydroxyphenyl)methane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)hexafluoropropane, 9,9-bis(4-hydroxyphenyl)fluorene, novolacs and resols. Examples of aliphatic and cycloaliphatic polyols are alkylenediols having preferably 2 to 12 C atoms, such as ethylene glycol, 1,2- or 1,3-propanediol, 1,2-, 1,3- or 1,4-butanediol, pentanediol, hexanediol, octanediol, dodecanediol, diethylene glycol, triethylene glycol, polyethylene glycols having molecular weights of preferably from 200 to 1500, 1,3-cyclopentanediol, 1,2-, 1,3- or 1,4-cyclohexanediol, 1,4-dihydroxymethylcyclohexane, glycerol, triethanolamine, trimethylolethane, trimethylolpropane, pentaerythritol, pentaerythritol monooxalate, dipentaerythritol, ethers of pentaerythritol with ethylene glycol or propylene glycol, ethers of dipentaerythritol with ethylene glycol or propylene glycol, sorbitol, 2,2-bis[4-(2-hydroxyethoxy)phenyl]methane, 2,2-bis[4-(2-hydroxyethoxy)phenyl]propane and 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene. Other suitable polyols are polymers and copolymers containing hydroxyl groups in the polymer chain or in side groups, examples being homopolymers or copolymers comprising vinyl alcohol or comprising hydroxyalkyl (meth)acrylates. Further polyols which are suitable are esters and urethanes having hydroxyl end groups.
The polyols may be partially or completely esterified with one unsaturated carboxylic acid or with different unsaturated carboxylic acids, and in partial esters the free hydroxyl groups may be modified, for example etherified or esterified with other carboxylic acids.
Examples of esters based on polyols are trimethylolpropane tri(meth)acrylate, trimethylolpropane tri(acryloyloxypropyl)ether, trimethylolethane tri(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, tetramethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate monooxalate, dipentaerythritol di(meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol penta(meth)acrylate mono(2-hydroxyethyl)ether, tripentaerythritol octa(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol diitaconate, hexanediol di(meth)acrylate, 1,4-cyclohexanediol di(meth)acrylate, sorbitol tri(meth)acrylate, sorbitol tetra(meth)acrylate, sorbitol penta(meth)acrylate, sorbitol hexa(meth)acrylate, oligoester (meth)acrylates, glycerol di(meth)acrylate and tri(meth)acrylate, di(meth)acrylates of polyethylene glycol with a molecular weight of from 200 to 1500, pentaerythritol diitaconate, dipentaerythritol trisitaconate, dipentaerythritol pentaitaconate, dipentaerythritol hexaitaconate, ethylene glycol diitaconate, propylene glycol diitaconate, 1,3-butanediol diitaconate, 1,4-butanediol diitaconate, tetramethylene glycol diitaconate, sorbitol tetraitaconate, ethylene glycol dicrotonate, tetramethylene glycol dicrotonate, pentaerythritol dicrotonate, ethylene glycol dimaleate, tiethylene glycol dimaleate, pentaerythritol dimaleate, sorbitol tetramaleate, or mixtures thereof.
Other examples are pentaerythritol and dipentaerythritol derivatives shown in the following formula (XII) and (XIII):




wherein

    M1 is —(CH2CH2O)— or —[CH2CH(CH3)O]—,
    R100 is —COCH═CH2 or —COC(CH3)═CH2,
    p is 0 to 6 (total of p: 3-24), and q is 0 to 6 (total of q: 2-16).


Examples of polyepoxides are those based on the abovementioned polyols and epichlorohydrin. Typical examples are bis(4-glycidyloxyphenyl)methane, 2,2-bis(4-glycidyloxyphenyl)propane, 2,2-bis(4-glycidyloxyphenyl)hexafluoropropane, 9,9-bis(4-glycidyloxyphenyl)fluorene, bis[4-(2-glycidyloxyethoxy)phenyl]methane, 2,2-bis[4-(2-glycidyloxyethoxy)phenyl]propane, 2,2-bis[4-(2-glycidyloxyethoxy)phenyl]hexafluoropropane, 9,9-bis[4-(2-glycidyloxyethoxy)phenyl]fluorene, bis[4-(2-glycidyloxypropoxy)phenyl]methane, 2,2-bis[4-(2-glycidyloxypropoxy)phenyl]propane, 2,2-bis[4-(2-glycidyloxypropoxy)phenyl]hexafluoropropane, 9,9-bis[4-(2-glycidyloxypropoxy)phenyl]fluorene, and glycidyl ethers of phenol and cresol novolacs.
Typical examples of component (a) based on polyepoxides are 2,2-bis[4-{(2-hydroxy-3-acryloxy)propoxy}phenyl]propane, 2,2-bis[4-{(2-hydroxy-3-acryloxy)propoxyethoxy}phenyl]propane, 9,9-bis[4-{(2-hydroxy-3-acryloxy)propoxy}phenyl]fluorene, 9,9-bis[4-{(2-hydroxy-3-acryloxy)propoxyethoxy}phenyl]fluorine, and reaction products of epoxy resins based on novolacs with (meth)acrylic acid.
Polyethers obtained from the reaction of the abovementioned polyols or polyepoxides with the unsaturated compounds with a hydroxy group such as 2-hydroxyethyl (meth)acrylate, vinyl alcohol can also be used as component (a).
Also suitable as components (a) are the amides of identical or different, unsaturated carboxylic acids with aromatic, cycloaliphatic and aliphatic polyamines having preferably 2 to 6, especially 2 to 4, amino groups. Examples of such polyamines are ethylenediamine, 1,2- or 1,3-propylenediamine, 1,2-, 1,3- or 1,4-butylenediamine, 1,5-pentylenediamine, 1,6-hexylenediamine, octylenediamine, dodecylenediamine, 1,4-diaminocyclohexane, isophoronediamine, phenylenediamine, bisphenylenediamine, di-R-aminoethyl ether, diethylenetriamine, triethylenetetramine, di(R-aminoethoxy)- or di(R-aminopropoxy)ethane. Other suitable polyamines are polymers and copolymers, preferably with additional amino groups in the side chain, and oligoamides having amino end groups. Examples of such unsaturated amides are methylenebisacrylamide, 1,6-hexamethylenebisacrylamide, diethylenetriaminetrismethacrylamide, bis(methacrylamidopropoxy)ethane, R-methacrylamidoethyl methacrylate and N[(β-hydroxyethoxy)ethyl]acrylamide.
Other examples are unsaturated urethanes derived from a polyisocyanate and an unsaturated compound having a hydroxy group or from a polyisocyanate, a polyol and an unsaturated compound having a hydroxy group.
Other examples are polyesters, polyamides, or polyurethanes having ethylenically unsaturated groups in the chain. Suitable unsaturated polyesters and polyamides are also derived, for example, from maleic acid and diols or diamines. Some of the maleic acid can be replaced by other dicarboxylic acids. The polyesters and polyamides may also be derived from dicarboxylic acids and ethylenically unsaturated diols or diamines, especially from those with relatively long chains of, for example 6 to 20 C atoms. Examples of polyurethanes are those composed of saturated or unsaturated diisocyanates and of unsaturated or, respectively, saturated diols.
Other suitable polymers with acrylate or methacrylate groups in the side chains are, for example, solvent soluble or alkaline soluble polyimide precursors, for example poly(amic acid ester) compounds, having the photopolymerizable side groups either attached to the backbone or to the ester groups in the molecule, i.e. according to EP624826. Such oligomers or polymers can be formulated optionally with reactive diluents, like polyfunctional (meth)acrylates in order to prepare highly sensitive polyimide precursor resists.
Further examples of the component a) are also polymers or oligomers having at least one carboxyl function and at least two ethylenically unsaturated groups within the molecular structure, such as a resin obtained by the reaction of a saturated or unsaturated polybasic acid anhydride with a product of the reaction of phenol or cresol novolac epoxy resin and an unsaturated monocarboxylic acid, for example, commercial products such as EB9696, UCB Chemicals; KAYARAD TCR1025, Nippon Kayaku Co., LTD. Examples of the polybasic acid anhydride are maleic anhydride, succinic anhydride, itaconic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyltetrahydrophathalic anhydride, glutaric anhydride, glutaconic anhydride, citraconic anhydride, diglycolic anhydride, iminodiacetic anhydride, 1,1-cyclopentanediacetic anhydride, 3,3-dimethylglutaric anhydride, 3-ethyl-3-methylglutaric anhydride, 2-phenylglutaric anhydride, homophthalic anhydride, trimellitic anhydride, chlorendic anhydride, pyromellitic dianhydride, benzophenone tetracarboxylic acid dianhydride, biphenyl tetracarboxylic acid dianhydride, and biphenylether tetracarboxylic acid dianhydride.
Other examples are the products from the polycondensation reaction and/or addition reaction of the compound of formula (XIV) with one or more abovementioned polybasic acid anhydrides.




    wherein Y1 is






    R200 is hydrogen or methyl,
    R300 and R400 independently of each other are hydrogen, methyl, Cl, or Br, M2 is substituted or unsubstituted alkylene having 1 to 10 carbon atoms, x is 0 to 5, and y is 1 to 10. Examples of such compounds as component (a) are described in JP2002-206014A, JP2004-69754A, JP2004-302245A, JP2005-77451A, JP2005-316449A, JP2005-338328A and JP3754065B2.


An example of the compound (XIV) is




which is obtained by a reaction of





with acrylic acid.

Polymers or oligomers as abovementioned have for example a molecular weight of about 1,000 to 1,000,000, preferably 2,000 to 200,000 and an acid value of about 10 to 200 mg KOH/g, preferably 20 to 180 mg KOH/g.
A preferred photopolymerizable composition comprises as component (a) a compound having at least two ethylenically unsaturated bonds and at least one carboxylic acid group in the molecule, in particular a reaction product obtained by adding an epoxy group containing unsaturated compound to a part of the carboxyl groups of a carboxylic acid group containing polymer or a reaction product of the compound shown below with one or more polybasic acid anhydrides. Further preferred components (a) comprise a compound obtained from the reaction of a compound of the formula XIV with one or more polybasic acid anhydrides.
Further examples are reaction products obtained by adding an epoxy group containing unsaturated compound to a part of the carboxyl groups of a carboxylic acid group containing polymer. As the carboxylic acid containing polymer, the abovementioned binder polymers which are resulting from the reaction of an unsaturated carboxylic acid compound with one or more polymerizable compounds, for example, copolymers of (meth)acrylic acid, benzyl (meth)acrylate, styrene and 2-hydroxyethyl (meth)acrylate, copolymers of (meth)acrylic acid, styrene and α-methystyrene, copolymers of (meth)acrylic acid, N-phenylmaleimide, styrene and benzyl (meth)acrylate, copolymers of (meth)acrylic acid and styrene, copolymers of (meth)acrylic acid and benzyl (meth)acrylate, copolymers of tetrahydrofurfuryl (meth)acrylate, styrene and (meth)acrylic acid, and the like.
Examples of the unsaturated compounds having an epoxy group are given below in the formula (V-1) (V-15);







    wherein R50 is hydrogen or methyl group, M3 is substituted or unsubstituted alkylene having 1 to 10 carbon atoms.


Among these compounds, compounds having alicyclic epoxy groups are particularly preferred, because these compounds have a high reactivity with carboxyl group-containing resins, accordingly the reaction time can be shortened. These compounds further do not cause gelation in the process of reaction and make it possible to carry out the reaction stably. On the other hand, glycidyl acrylate and glycidyl methacrylate are advantageous from the viewpoint of sensitivity and heat resistance because they have a low molecular weight and can give a high conversion of esterification.
Concrete examples of the abovementioned compounds are, for example a reaction product of a copolymer of styrene, α-methyl styrene and acrylic acid or a copolymer of methyl methacrylate and acrylic acid with 3,4-epoxycyclohexylmethyl (meth)acrylate.
Unsaturated compounds having a hydroxy group such as 2-hydroxyethyl (meth)acrylate and glycerol mono(meth)acrylate can be used instead of the above mentioned epoxy group containing unsaturated compounds as the reactant for carboxylic acid group containing polymers.
Other examples are half esters of anhydride containing polymers, for example reaction products of a copolymer of maleic anhydride and one or more other polymerizable compounds with (meth)acrylates having an alcoholic hydroxy group such as 2-hydroxyethyl (meth)acrylate or having an epoxy group for example such as the compounds described in the formula (V-1) (V-15).
Reaction products of polymers having alcoholic hydroxy groups such as copolymers of 2-hydroxyethyl (meth)acrylate, (meth)acrylic acid, benzyl methacylate and styrene, with (meth)acrylic acid or (meth)acryl chloride can also be used as component (a).
Other examples are reaction products of a polyester with terminal unsaturated groups, which is obtained from the reaction of a dibasic acid anhydride and a compound having at least two epoxy groups followed by further reaction with an unsaturated compound, with a polybasic acid anhydride.
Further examples are resins obtained by the reaction of a saturated or unsaturated polybasic acid anhydride with a reaction product obtained by adding epoxy group containing (meth)acrylic compound to all of the carboxyl groups of a carboxylic acid containing polymer as mentioned above.
The photopolymerizable compounds can be used alone or in any desired mixtures.
In a color filter resist composition the whole amount of the monomers contained in the photopolymerizable composition is preferably 5 to 80% by weight, in particular 10 to 70% by weight based on the whole solid contents of the composition, i.e. the amount of all components without the solvent(s).
As the binder used in the color filter resist composition, which is soluble in an alkaline aqueous solution and insoluble in water, for example, a homopolymer of a polymerizable compound having one or more acid groups and one or more polymerizable unsaturated bonds in the molecule, or a copolymer of two or more kinds thereof, and a copolymer of one or more polymerizable compounds having one or more unsaturated bonds copolymerizable with these compounds and containing no acid group, can be used. Such compounds can be obtained by copolymerizing one or more kinds of a low molecular compound having one or more acid groups and one or more polymerizable unsaturated bonds in the molecule with one or more polymerizable compounds having one or more unsaturated bonds copolymerizable with these compounds and containing no acid group. Examples of acids groups are, a —COOH group, a —SO3H group, a —SO2NHCO— group, a phenolic hydroxy group, a —SO2NH— group, and a —CO—NH—CO— group. Among those, a high molecular compound having a —COOH group is particularly preferred.
Preferably, the organic polymer binder in the color filter resist composition comprises an alkali soluble copolymer comprising, as addition polymerizable monomer units, at least an unsaturated organic acid compound such as acrylic acid, methacrylic acid and the like. It is preferred to use as a further co-monomer for the polymer binder an unsaturated organic acid ester compound such as methyl acrylate, ethyl (meth)acrylate, benzyl (meth)acrylate, styrene and the like to balance properties such as alkaline solubility, adhesion rigidity, chemical resistance etc.
The organic polymer binder can either be a random co-polymer or a block-co-polymer, for example, such as described in U.S. Pat. No. 5,368,976.
Examples of polymerizable compounds having one or more acid group and one or more polymerizable unsaturated bond in the molecule include the following compounds:
Examples of the polymerizable compounds having one or more —COOH groups and one or more polymerizable unsaturated bonds in a molecule are (meth)acrylic acid, 2-carboxyethyl (meth)acrylic acid, 2-carboxypropyl (meth)acrylic acid, crotonic acid, cinnamic acid, mono[2-(meth)acryloyloxyethyl] succinate, mono[2-(meth)acryloyloxyethyl] adipate, mono[2-(meth)acryloyloxyethyl] phthalate, mono[2-(meth)acryloyloxyethyl] hexahydrophthalate, mono[2-(meth)acryloyloxyethyl] maleate, mono[2-(meth)acryloyloxypropyl] succinate, mono[2-(meth)acryloyloxypropyl] adipate, mono[2-(meth)acryloyloxypropyl] phthalate, mono[2-(meth)acryloyloxypropyl] hexahydrophthalate, mono[2-(meth)acryloyloxypropyl] maleate, mono[2-(meth)acryloyloxybutyl] succinate, mono[2-(meth)acryloyloxybutyl] adipate, mono[2-(meth)acryloyloxybutyl] phthalate, mono[2-(meth)acryloyloxybutyl] hexahydrophthalate, mono[2-(meth)acryloyloxybutyl] maleate, 3-(alkylcarbamoyl)acrylic acid, α-chloroacrylic acid, maleic acid, monoesterified maleic acid, fumaric acid, itaconic acid, citraconic acid, mesaconic acid, maleic anhydride, and ω-carboxypolycaprolactone mono(meth)acrylate. Vinylbenzenesulfonic acid and 2-(meth)acrylamide-2-methylpropanesulfonic acid are examples of the polymerizable compounds having one or more —SO3H groups and one or more polymerizable unsaturated bonds.
N-methylsulfonyl (meth)acrylamide, N-ethylsulfonyl (meth)acrylamide, N-phenylsulfonyl (meth)acrylamide, and N-(p-methylphenylsulfonyl) (meth)acrylamide are examples of the polymerizable compounds having one or more —SO2NHCO— groups and one or more polymerizable unsaturated bonds.
Examples of polymerizable compounds having one or more phenolic hydroxy groups and one or more polymerizable unsaturated bonds in a molecule include hydroxyphenyl (meth)acrylamide, dihydroxyphenyl (meth)acrylamide, hydroxyphenyl-carbonyloxyethyl (meth)acrylate, hydroxyphenyloxyethyl (meth)acrylate, hydroxyphenylthioethyl (meth)acrylate, dihydroxyphenylcarbonyloxyethyl (meth)acrylate, dihydroxyphenyloxyethyl (meth)acrylate, and dihydrooxy-phenylthioethyl (meth)acrylate.
Examples of the polymerizable compound having one or more —SO2NH— groups and one or more polymerizable unsaturated bonds in the molecule include compounds represented by formula (a) or (b):

CH2═CHA1-Y1-A2-SO2—NH-A3  (a)

CH2═CHA4-Y2-A5-NH—SO2-A6  (b)

wherein Y1 and Y2 each represents —COO—, —CONA7-, or a single bond; A1 and A4 each represents H or CH3; A2 and A5 each represents C1-C12alkylene optionally having a substituent, cycloalkylene, arylene, or aralkylene, or C2-C12alkylene into which an ether group and a thioether group are inserted, cycloalkylene, arylene, or aralkylene; A3 and A6 each represents H, C1-C12alkyl optionally having a substituent, a cycloalkyl group, an aryl group, or an aralkyl group; and A7 represents H, C1-C12alkyl optionally having a substituent, a cycloalkyl group, an aryl group, or an aralkyl group.

The polymerizable compounds having one or more —CO—NH—CO— group and one or more polymerizable unsaturated bond include maleimide and N-acryloyl-acrylamide. These polymerizable compounds become the high molecular compounds comprising a —CO—NH—CO— group, in which a ring is formed together with a primary chain by polymerization. Further, a methacrylic acid derivative and an acrylic acid derivative each having a —CO—NH—CO— group can be used as well. Such methacrylic acid derivatives and the acrylic acid derivatives include, for example, a methacrylamide derivative such as N-acetylmethacrylamide, N-propionylmethacrylamide, N-butanoylmethacrylamide, N-pentanoylmethacrylamide, N-decanoylmethacrylamide, N-dodecanoylmethacrylamide, N-benzoylmethacrylamide, N-(p-methylbenzoyl)methacryl-amide, N-(p-chlorobenzoyl)methacrylamide, N-(naphthyl-carbonyl)methacrylamide, N-(phenylacetyl)-methacryl-amide, and 4-methacryloylaminophthalimide, and an acrylamide derivative having the same substituent as these. These polymerizable compounds polymerize to be compounds having a —CO—NH—CO— group in a side chain.
Examples of polymerizable compounds having one or more polymerizable unsaturated bond and containing no acid group include a compound having a polymerizable unsaturated bond, selected from esters of (meth)acrylic acid, such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, benzyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, glycerol mono(meth)acrylate, dihydroxypropyl (meth)acrylate, allyl (meth)acrylate, cyclohexyl (meth)acrylate, phenyl (meth)acrylate, methoxyphenyl (meth)acrylate, methoxyethyl (meth)acrylate, phenoxyethyl (meth)acrylate, methoxydiethyleneglycol (meth)acrylate, methoxytriethyleneglycol (meth)acrylate, methoxypropyl (meth)acrylate, methoxydipropyleneglycol (meth)acrylate, isobornyl meth(acrylate), dicyclopentadienyl (meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, tricyclo[5.2.1.02,6]-decan-8-yl (meth)acrylate, aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, aminopropyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylate, glycidyl (meth)acrylate, 2-methylglycidyl (meth)acrylate, 3,4-epoxybutyl (meth)acrylate, 6,7-epoxyheptyl (meth)acrylate; vinyl aromatic compounds, such as styrene, α-methylstyrene, vinyltoluene, p-chlorostyrene, polychlorostyrene, fluorostyrene, bromostyrene, ethoxymethyl styrene, methoxystyrene, 4-methoxy-3-methystyrene, dimethoxystyrene, vinylbenzyl methyl ether, vinylbenzyl glycidyl ether, indene, 1-methylindene; vinyl or allyl esters, such as vinyl acetate, vinyl propionate, vinyl butylate, vinyl pivalate, vinyl benzoate, vinyl trimethylacetate, vinyl diethylacetate, vinyl barate, vinyl caproate, vinyl chloroacetate, vinyl dichloroacetate, vinyl methoxyacetate, vinyl butoxyacetate, vinyl phenylacetate, vinyl acetate, vinyl acetoacetate, vinyl lactate, vinyl phenylbutylate, vinyl cyclohexylcarboxylate, vinyl salicylate, vinyl chlorobenzoate, vinyl tetrachlorobenzoate, vinyl naphthoate, allyl acetate, allyl propionate, allyl butylate, allyl pivalate, allyl benzoate, allyl caproate, allyl stearate, allyl acetoacetate, allyl lactate; vinyl or allyl ethers, such as vinyl methyl ether, vinyl ethyl ether, vinyl hexyl ether, vinyl octyl ether, vinyl ethylhexyl ether, vinyl methoxyethyl ether, vinyl ethoxyethyl ether, vinyl chloroethyl ether, vinyl hydroxyethyl ether, vinyl ethylbutyl ether, vinyl hydroxyethoxyethyl ether, vinyl dimethylaminoethyl ether, vinyl diethylaminoethyl ether, vinyl butylaminoethyl ether, vinyl benzyl ether, vinyl tetrahydrofurfuryl ether, vinyl phenyl ether, vinyl tolyl ether, vinyl chlorophenyl ether, vinyl chloroethyl ether, vinyl dichlorophenyl ether, vinyl naphthyl ether, vinyl anthryl ether, allyl glycidyl ether; amide type unsaturated compounds, such as (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N,N-dibutyl (meth)acrylamide, N,N-diethylhexyl (meth)acrylamide, N,N-dicyclohexyl (meth)acrylamide, N,N-diphenyl (meth)acrylamide, N-methyl-N-phenyl (meth)acrylamide, N-hydroxyethyl-N-methyl (meth)acrylamide, N-methyl (meth)acrylamide, N-ethyl (meth)acrylamide, N-propyl (meth)acrylamide, N-butyl (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N-heptyl (meth)acrylamide, N-octyl (meth)acrylamide, N-ethyhexyl (meth)acrylamide, N-hydroxyethyl (meth)acrylamidecyclohexyl, N-benzyl (meth)acrylamide, N-phenyl (meth)acrylamide, N-tolyl (meth)acrylamide, N-hydroxyphenyl (meth)acrylamide, N-naphthyl (meth)acrylamide, N-phenylsulfonyl (meth)acrylamide, N-methylphenylsulfonyl (meth)acrylamide and N-(meth)acryloylmorpholine, diacetone acrylamide, N-methylol acrylamide, N-butoxyacrylamide; polyolefin type compounds, such as butadiene, isoprene, chloroprene and the like; (meth)acrylonitrile, methyl isopropenyl ketone, maleimide, N-phenylmaleimide, N-methylphenylmaleimide, N-methoxyphenylmaleimide, N-cyclohexylmaleimide, N-alkylmaleimide, maleic anhydride, polystyrene macromonomer, polymethyl (meth)acrylate macromonomer, polybutyl (meth)acrylate macromonomer; crotonates, such as butyl crotonate, hexyl crotonate, glycerine monocrotonate; and itaconates, such as dimethyl itaconate, diethyl itaconate, dibutyl itaconate; and maleates or fumarates, such as dimethyl mareate, dibutyl fumarate.
Preferable examples of copolymers are copolymers of methyl (meth)acrylate and (meth)acrylic acid, copolymers of benzyl (meth)acrylate and (meth)acrylic acid, copolymers of methyl (meth)acrylate/, ethyl (meth)acrylate and (meth)acrylic acid, copolymers of benzyl (meth)acrylate, (meth)acrylic acid and styrene, copolymers of benzyl (meth)acrylate, (meth)acrylic acid and 2-hydroxyethyl (meth)acrylate, copolymers of methyl (meth)acrylate/, butyl (meth)acrylate, (meth)acrylic acid and styrene, copolymers of methyl (meth)acrylate, benzyl (meth)acrylate, (meth)acrylic acid and hydroxyphenyl (meth)acrylate, copolymers of methyl (meth)acrylate, (meth)acrylic acid and polymethyl (meth)acrylate macromonomer, copolymers of benzyl (meth)acrylate, (meth)acrylic acid and polymethyl (meth)acrylate macromonomer, copolymers of tetrahydrofurfuryl (meth)acrylate, styrene and (meth)acrylic acid, copolymers of methyl (meth)acrylate, (meth)acrylic acid and polystyrene macromonomer, copolymers of benzyl (meth)acrylate, (meth)acrylic acid and polystyrene macromonomer, copolymers of benzyl (meth)acrylate, (meth)acrylic acid, 2-hydroxyethyl (meth)acrylate and polystyrene macromonomer, copolymers of benzyl (meth)acrylate, (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate and polystyrene macromonomer, copolymers of benzyl (meth)acrylate, (meth)acrylic acid, 2-hydroxy-3-phenoxypropyl (meth)acrylate and polymethyl (meth)acrylate macromonomer, copolymers of methyl (meth)acrylate, (meth)acrylic acid, 2-hydroxyethyl (meth)acrylate and polystyrene macromonomer, copolymers of benzyl (metha)crylate, (meth)acrylic acid, 2-hydroxyethyl (meth)acrylate and polymethyl (meth)acrylate macromonomer, copolymers of N-phenylmaleimide, benzyl (meth)acrylate, (meth)acrylic acid and styrene, copolymers of benzyl (meth)acrylate, (meth)acrylic acid, N-phenylmaleimide, mono-[2-(meth)acryloyloxyethyl] succinate and styrene, copolymers of allyl (meth)acrylate, (meth)acrylic acid, N-phenylmaleimide, mono-[2-(meth)acryloyloxyethyl] succinate and styrene, copolymers of benzyl (meth)acrylate, (meth)acrylic acid, N-phenylmaleimide, glycerol mono(meth)acrylate and styrene, copolymers of benzyl (meth)acrylate, ω-carboxypolycaprolactone mono(meth)acrylate, (meth)acrylic acid, N-phenylmaleimide, glycerol mono(meth)acrylate and styrene, and copolymers of benzyl (meth)acrylate, (meth)acrylic acid, N-cyclohexylmaleimide and styrene.
The term “(meth)acrylate” in the context of the present application is meant to refer to the acrylate as well as to the corresponding methacrylate.
There can be used as well hydroxystyrene homo- or co-polymers or a novolak type phenol resin, for example, poly(hydroxystyrene) and poly(hydroxystyrene-co-vinylcyclohexanol), a novolak resin, a cresol novolak resin, and a halogenated phenol novolak resin. More specifically, it includes, for example, the methacrylic acid copolymers, the acrylic acid copolymers, the itaconic acid copolymers, the crotonic acid copolymers, the maleic anhydride co-polymers, for example, with styrene as a co-monomer, and maleic acid copolymers, and partially esterified maleic acid copolymers each described in, for example, JP 59-44615-B4 (the term “JP-B4” as used herein refers to an examined Japanese patent publication), JP 54-34327-B4, JP 58-12577-B4, and JP 54-25957-B4, JP 59-53836-A, JP 59-71048-A, JP 60-159743-A, JP 60-258539-A, JP 1-152449-A, JP 2-199403-A, and JP 2-199404-A, and which copolymers can be further reacted with an amine, as e.g. disclosed in U.S. Pat. No. 5,650,263; further, a cellulose derivative having a carboxyl group on a side chain can be used, and particularly preferred are copolymers of benzyl (meth)acrylate and (meth)acrylic acid and copolymers of benzyl (meth)acrylate, (meth)acrylic acid and other monomers, for example as described in U.S. Pat. No. 4,139,391, JP 59-44615-B4, JP 60-159743-A and JP 60-258539-A.
With respect to those having carboxylic acid groups among the above organic binder polymers, it is possible to react some or all of the carboxylic acid groups with glycidyl(meth)acrylate or an epoxy(meth)acrylate to obtain photopolymerizable organic binder polymers for the purpose of improving the photosensitivity, coating film strength, the coating solvent and chemical resistance and the adhesion to the substrate. Examples are disclosed in, JP 50-34443-B4 and JP 50-34444-B4, U.S. Pat. No. 5,153,095, by T. Kudo et al. in J. Appl. Phys., Vol. 37 (1998), p. 3594-3603, U.S. Pat. No. 5,677,385, and U.S. Pat. No. 5,650,233.
The weight-average molecular weight of the binders is preferably 500 to 1,000,000, e.g. 3,000 to 1,000,000, more preferably 5,000 to 400,000.
These compounds may be used singly or as a mixture of two or more kinds. The content of the binder in the light-sensitive resin composition is preferably 10 to 95 weight %, more preferably 15 to 90 weight % based on the whole solid matters.
Further, in the color filter the total solid component of each color may contain an ionic impurity-scavenger, e.g. an organic compound having an epoxy group. The concentration of the ionic impurity scavenger in the total solid component generally is in the range from 0.1% by weight to 10% by weight.
Examples of color filters, especially with respect to the above described combinations of pigments and ionic impurity scavenger are given in EP320264. It is understood, that the photoinitiators according to the present invention, i.e. the compounds of the formulae I, II, and III in the color filter formulations described in EP320264 can replace the triazine initiator compounds.
The compositions according to this invention can comprise additionally a crosslinking agent which is activated by an acid, for example as described in JP 10 221843-A, and a compound which generates acid thermally or by actinic radiation and which activates a crosslinking reaction.
The compositions according to this invention can also comprise latent pigments which are transformed into finely dispersed pigments during the heat treatment of the latent pigment containing photosensitive pattern or coating. The heat treatment can be performed after exposure or after development of the latent pigment-containing photoimageable layer. Such latent pigments are soluble pigment precursors which can be transformed into insoluble pigments by means of chemical, thermal, photolytic or radiation induced methods as described, for example, in U.S. Pat. No. 5,879,855. This transformation of such latent pigments can be enhanced by adding a compound which generates acid at actinic exposure or by adding an acidic compound to the composition. Therefore, a color filter resist can also be prepared, which comprises a latent pigment in a composition according to this invention.
Examples for color filter resists, the composition of such resists and the processing conditions are given by T. Kudo et al., Jpn. J. Appl. Phys. Vol. 37 (1998) 3594; T. Kudo et al., J. Photopolym. Sci. Technol. Vol 9 (1996) 109; K. Kobayashi, Solid State Technol. November 1992, p. S15-S18; U.S. Pat. Nos. 5,368,976; 5,800,952; 5,882,843; 5,879,855; 5,866,298; 5,863,678; JP 06-230212-A; EP320264; JP 09-269410-A; JP 10-221843-A; JP 01-090516-A; JP 10-171119-A, U.S. Pat. Nos. 5,821,016, 5,847,015, 5,882,843, 5,719,008, EP881541, or EP902327.
The photoinitiators of the present invention can be used in color filter resists, for example, such as those given as examples above, or can partially or fully replace the known photoinitiators in such resists. It is understood by a person skilled in the art that the use of the new photoinitiators of the present invention is not limited to the specific binder resins, crosslinkers and formulations of the color filter resist examples given hereinbefore but can be used in conjunction with any radically polymerizable component in combination with a dye or color pigment or latent pigment to form a photosensitive color filter ink or color filter resist.
Accordingly, subject of the invention also is a color filter prepared by providing red, green and blue (RGB) colour elements and, optionally a black matrix, all comprising a photosensitive resin and a pigment on a transparent substrate and providing a transparent electrode either on the surface of the substrate or on the surface of the color filter layer, wherein said photosensitive resin comprises a polyfunctional acrylate monomer, an organic polymer binder and a photopolymerization initiator of formula I, II or III as described above. The monomer and binder components, as well as suitable pigments are as described above. In the manufacture of color filters the transparent electrode layer can either be applied on the surface of the transparent substrate or can be provided on the surface of the red, green and blue picture elements and the black matrix. The transparent substrate is for example a glass substrate which can additionally have an electrode layer on its surface.
It is preferred to apply a black matrix between the color areas of different color in order to improve the contrast of a color filter.
The photosensitive compositions of the present invention, as already stated above, are also suitable for the preparation of the black matrix of color filters. Said black matrix composition for example comprises

    
    
        a photoinitiator compound of the formula I or II of the present invention or a photoinitiator mixture of a compound of the formula I or II and a compound of the formula I′ or II′ according to the present invention as described above,
        an organic binder, in particular an organic binder, which is an epoxy acrylate resin having a carboxyl group,
        a black coloring material,
        a polymer dispersant, in particular a polymer dispersant containing a basic functional group.
    
    


The person skilled in the art is familiar with such formulations. Examples of suitable black matrix compositions and the components (other than the photoinitiator) as described above are given in JP Patent No. 375065, the disclosure of which hereby is incorporated by reference.
Subject of the invention also is a photopolymerizable composition as described above as further additive (d) comprising a pigment or a mixture of pigments.
Another subject of the invention is a photopolymerizable composition as described above as further additive (d), optionally in addition to the pigment or the mixture of pigments asfurther additive (d), comprising a dispersant or a mixture of dispersants.
Instead of forming a black matrix using a photosensitive composition and patterning the black photosensitive composition photolithographically by patternwise exposure (i.e. through a suitable mask) to form the black pattern separating the red green and blue coloured areas on the tranparent substrate it is alternatively possible to use an inorganic black matrix. Such inorganic black matrix can be formed from deposited (i.e. sputtered) metal (i.e. chromium) film on the transparent substrate by a suitable imaging process, for example utilizing photolithographic patterning by means of an etch resist, etching the inorganic layer in the areas not protected by the etch resist and then removing the remaining etch resist.
There are different methods known how and at which step in the color filter manufacturing process the black matrix can be applied. It can either be applied directly on the transparent substrate prior to formation of the red, green and blue (RGB) colour filter as already mentioned above, or it can be applied after the RGB colour filter is formed on the substrate.
In a different embodiment of a color filter for a liquid crystal display, according to U.S. Pat. No. 626,796, the black matrix can also be applied on the substrate opposite to the RGB color filter element-carrying substrate, which is separated from the former by a liquid crystal layer.
If the transparent electrode layer is deposited after applying the RGB color filter elements and—optionally—the black matrix, an additional overcoat film as a protective layer can be applied on the color filter layer prior to deposition of the electrode layer, for example, as described in U.S. Pat. No. 5,650,263.
To form an overcoat layer of a color filter, photosensitive resin or thermosetting resin compositions are employed. The photosensitive composition of the present invention can also be used to form such overcoat layers, because a cured film of the composition is excellent in flatness, hardness, chemical and thermal resistance, transparency especially in a visible region, adhesion to a substrate, and suitability for forming a transparent conductive film, e.g., an ITO film, thereon. In the production of a protective layer, there has been a demand that unnecessary parts of the protective layer, for example on scribing lines for cutting the substrate and on bonding pads of solid image sensors should be removed from the substrate as described in JP57-42009-A, JP1-130103-A and JP1-134306-A. In this regard, it is difficult to selectively form a protective layer with good precision using the above-mentioned thermosetting resins. The photosensitive composition, however, allows to easily remove the unnecessary parts of the protective layer by photolithography.
It is obvious to those skilled in the art, that the photosensitive compositions of the present invention can be used for generating red, green and blue color pixels and a black matrix, for the manufacture of a color filter, regardless of the above described differences in processing, regardless, of additional layers which can be applied and regardless of differences in the design of the color filter. The use of a composition according to the present invention to form colored elements shall not be regarded as limited by different designs and manufacturing processes of such color filters.
The photo-sensitive composition of the present invention can suitably be used for forming a color filter and a black matrix, but will not be limited to these applications. It is useful as well for a recording material, a resist material, a protective layer, a dielectric layer, in display applications and display elements, a paint, and a printing ink.
The photosensitive compositions according to the invention are also suitable for manufacturing interlayer insulating layers or dielectric layers in a liquid crystal display, and more particularly in a reflection type liquid crystal display including an active matrix type display having a thin film transistor (TFT) as a switching device, and a passive matrix type without a switching device. In recent years, liquid crystal displays have, for example, been widely used for pocket-type TV sets and terminal devices for communication by virtue of its small thickness and light weight. A reflection type liquid crystal display without necessity of using a back light is in particular in demand because it is ultra-thin and light-weight, and it can significantly reduce power consumption. However, even if a back light is removed out of a presently available transmission type color liquid crystal display and a light reflection plate is added to a lower surface of the display, it would cause a problem in that the efficiency of utilizing lights is low, and it is not possible to have practical brightness.
As a solution to this problem, there have been suggested various reflection type liquid crystal displays for enhancing an efficiency of utilizing lights. For instance, a certain reflection type liquid crystal display is designed to include a pixel electrode having reflection function. The reflection type liquid crystal display includes an insulating substrate and an opposing substrate spaced away from the insulating substrate. A space between the substrates is filled with liquid crystals. A gate electrode is formed on the insulating substrate, and both the gate electrode and the insulating substrate are covered with a gate insulating film. A semiconductor layer is then formed on the gate insulating film above the gate electrode. A source electrode and a drain electrode are also formed on the gate insulating film in contact with the semiconductor layer. The source electrode, the drain electrode, the semiconductor layer, and the gate electrode cooperate with one another to thereby constitute a bottom gate type TFT as a switching device.
An interlayer insulating film is formed covering the source electrode, the drain electrode, the semiconductor layer, and the gate insulating film therewith. A contact hole is formed throughout the interlayer insulating film on the drain electrode. A pixel electrode made of aluminum is formed on both the interlayer insulating film and an inner sidewall of the contact hole. The drain electrode of the TFT is eventually in contact with the pixel electrode through the interlayer insulating film. The interlayer insulating layer is generally designed to have a roughened surface by which the pixel electrode acts as a reflection plate which diffuses lights to get a wider angle for viewing (angle of visibility).
The reflection type liquid crystal display remarkably enhances an efficiency of using lights by virtue that the pixel electrode acts as a light reflection plate.
In the above-mentioned reflection type liquid crystal display, the interlayer insulating film is designed to have projections and recesses by photolithography. To form and control a fine shape of the projections and recesses in micrometer order for surface roughness and to form contact holes, photolithography methods using positive and negative photoresists are used. For these resists the compositions according to the invention are especially suitable.
The photosensitive compositions according to the invention can further be used for manufacturing spacers, which control a cell gap of the liquid crystal part in liquid crystal display panels. Since the properties of light transmitted or reflected through the liquid crystal layer in a liquid crystal display are dependent on the cell gap, the thickness accuracy and uniformity over the pixel array are critical parameters for the performance of the liquid crystal display unit. In a liquid crystal cell, the spacing between the substrates in the cell is maintained constant by sparsely distributing glass or polymer spheres about several micrometers in diameter as spacers between the substrates. The spacers are thus held between the substrates to maintain the distance between the substrates at a constant value. The distance is determined by the diameter of the spacers. The spacers assure the minimum spacing between the substrates; i.e., they prevent a decrease in distance between the substrates. However, they cannot prevent the substrates from being separated apart from each other, i.e., the increase in distance between the substrates. Additionally, this method of using spacer beads has problems of the uniformity in the diameter of spacer beads and difficulty in the even dispersion of spacer beads on the panel, as well as nonuniform orientation and decrease in brightness and/or optical aperture depending on the location of spacers on pixel array region. Liquid crystal displays having a large image display area have recently been attracting much attention. However, the increase in the area of a liquid crystal cell generally produces the distortion of the substrates constituting the cell. The layer structure of the liquid crystal tends to be destroyed due to the deformation of the substrate. Thus, even when spacers are used for maintaining the spacing between the substrates constant, a liquid crystal display having a large image display area is unfeasible because the display experiences disturbances. Instead of the above spacer sphere dispersion method, a method of forming columns in the cell gap as spacers has been proposed. In this method, columns of a resin are formed as spacers in the region between the pixel array region and the counter electrode to form a prescribed cell gap. Photosensitive materials having adhesive properties with photolithography are commonly used, for instance, in the manufacturing process of color filters. This method is advantageous compared with the conventional method using spacer beads in the points that location, number and height of the spacers may be controlled freely. In a color liquid crystal display panel, such spacers are formed in the nonimaging area under black matrix of color filter elements. Therefore, the spacers formed using photosensitive compositions do not decrease brightness and optical aperture.
Photosensitive compositions for producing protective layer with spacers for color filters are disclosed in JP 2000-81701-A and dry film type photoresists for spacer materials are also disclosed in JP 11-174459-A and JP 11-174464-A. As described in the documents, the photosensitive compositions, liquid and dry film photoresists, are comprising at least an alkaline or acid soluble binder polymer, a radically polymerizable monomer, and a radical initiator. In some cases, thermally crosslinkable components such as epoxide and carboxylic acid may additionally be included.
The steps to form spacers using a photosensitive composition are as follows:

    a photosensitive composition is applied to the substrate, for instance a color filter panel and after the substrate is prebaked, it is exposed to light through a mask. Then, the substrate is developed with a developer and patterned to form the desired spacers. When the composition contains some thermosetting components, usually a postbaking is carried out to thermally cure the composition.


The photocurable compositions according to the invention are suitable for producing spacers for liquid crystal displays (as described above) because of their high sensitivity.
The photosensitive compositions according to the invention are also suitable for manufacturing microlens arrays used in liquid crystal display panels, image sensors and the like.
Microlenses are microscopic passive optical components that fit on active optoelectronic devices such as detectors, displays, and light emitting devices (light-emitting diodes, transversal and vertical cavity lasers) to improve their optical input or output quality. The areas of applications are wide and cover areas such as telecommunications, information technology, audio-visual services, solar cells, detectors, solid-state light sources, and optical interconnects. Present optical systems use a variety of techniques to obtain efficient coupling between microlenses and microoptical devices.
The microlens arrays are used for condensing illuminating light on the picture element regions of a nonluminescent display device, such as a liquid crystal display devices, to increase the brightness of the display, for condensing incident light or as a means for forming an image on the photoelectric conversion regions of a line image sensor used for example in facsimiles and the like to improve the sensitivity of these devices, and for forming an image to be printed on a photosensitive means used in liquid crystal printers or light emitting diode (LED) printers.
The most common application is their use to improve the efficiency of photodetector arrays of a solid-state image sensing device such as a charge coupled device (CCD). In a detector array, the collection of as much light as possible in each detector element or pixel is wanted. If a microlens is put on top of each pixel, the lens collects incoming light and focuses it onto an active area that is smaller than the size of the lens.
According to the prior-art, microlens arrays can be produced by a variety of methods;

    (1) A method for obtaining convex lenses wherein a pattern of the lenses in a planar configuration is drawn on a thermoplastic resin by a conventional photolithographic technique or the like, and then the thermoplastic resin is heated to a temperature above the softening point of the resin to have flowability, thereby causing a sag in the pattern edge (so called “reflowing”) (see, e.g., JP 60-38989-A, JP 60-165623-A, JP 61-67003-A, and JP 2000-39503-A). In this method, when the thermoplastic resin used is photosensitive, a pattern of the lenses can be obtained by exposure of this resin to light.
    (2) A method for forming a plastic or glass material by the use of a mold or a stamper. As lens material, a photocurable resin and a thermosetting resin can be used in this method (see, e.g., WO99/38035).
    (3) A method for forming convex lenses on the basis of a phenomenon in which when a photosensitive resin is exposed to light in a desired pattern by the use of an aligner, unreacted monomers move from the unexposed regions to the exposed regions, resulting in a swell of the exposed regions (see, e.g., Journal of the Research Group in Microoptics Japanese Society of Applied Physics, Colloquium in Optics, Vol. 5, No. 2, pp. 118-123 (1987) and Vol. 6, No. 2, pp. 87-92 (1988)).


On the upper surface of a supporting substrate, a photosensitive resin layer is formed. Thereafter, with the use of a separate shading mask, the upper surface of the photosensitive resin layer is illuminated with light from a mercury lamp or the like, so that the photosensitive resin layer is exposed to the light. As a result, the exposed portions of the photosensitive resin layer swell into the shape of convex lenses to form the light condensing layer having a plurality of microlens.

    (4) A method for obtaining convex lenses wherein a photosensitive resin is exposed to light by a proximity exposure technique in which a photomask is not brought into contact with the resin, to cause a blur at the pattern edge, so that the amount of photochemical reaction products is distributed depending upon the degree of blurring at the pattern edge (see, e.g., JP 61-153602-A).
    (5) A method for generating a lens effect wherein a photosensitive resin is exposed to light with a particular intensity distribution to form a distribution pattern of refractive index depending upon the light intensity (see, e.g., JP 60-72927-A and JP 60-166946-A).


The photosensitive compositions according to the invention can be used in any one of the above-mentioned methods to form microlens arrays using photocurable resin compositions.
A particular class of techniques concentrates on forming microlenses in thermoplastic resins like photoresist. An example is published by Popovic et al. in the reference SPIE 898, pp. 23-25 (1988). The technique, named reflow technique, comprises the steps of defining the lenses' footprint in a thermoplastic resin, e.g. by photolithography in a photosensitive resin like a photoresist, and subsequently heating this material above its reflow temperature. The surface tension draws the island of photoresist into a spherical cap with a volume equal to the original island before the reflow. This cap is a plano-convex microlens. Advantages of the technique are, amongst others, the simplicity, the reproducibility, and the possibility of integration directly on top of a light-emitting or light-detecting optoelectronic device. In some cases, an overcoat layer is formed on the patterned lens units with a rectangular shape prior to reflowing to avoid a sagging of the island of the resin in the middle without reflow into a spherical cap in the reflow step. The overcoat acts as a permanent protective layer. The coating layer is also made of a photosensitive composition.
Microlens arrays can also be fabricated by the use of a mold or a stamper as, for example, disclosed in EP0932256. A process of manufacturing the planar microlens array is as follows: a release agent is coated on a shaping surface of a stamper on which convex portions are densely arranged, and a photocurable synthetic resin material having a high refractive index is set on the shaping surface of the stamper. Next, the base glass plate is pushed onto the synthetic resin material, thereby spreading the synthetic resin material, and the synthetic resin material is cured by irradiating with ultraviolet radiation or by heating and is shaped to form the convex microlenses. Thereafter the stamper is peeled off. Then, a photocurable synthetic resin material having a low refractive index is additionally coated onto the convex microlenses as an adhesive layer and a glass substrate which is made into a cover glass plate is pushed onto the synthetic resin material, thereby spreading the same. The synthetic resin material is then cured and finally the planar microlens array is formed.
As disclosed in U.S. Pat. No. 5,969,867, a similar method using a mold is applied for the production of a prism sheet, which is used as a part of backlight units for color liquid crystal display panels to enhance the brightness. A prism sheet forming a prism row on one side is mounted on the light-emitting surface of the backlight. For fabricating a prism sheet, an active energy ray-curable composition is cast and spread in a lens mold which is made of metal, glass or resin and forms the lens shape of the prism row, etc., after which a transparent substrate sheet is placed onto it and active energy rays from an active energy ray-emitting source are irradiated through the sheet for curing. The prepared lens sheet is then released from the lens mold to obtain the lens sheet.
The active energy ray-curable composition used to form the lens section must have a variety of properties, including adhesion to the transparent substrate, and suitable optical characteristics.
Lenses at least with some photoresists in the prior art are not desirable for some applications since the optical transmittance in the blue end of the optical spectrum is poor.
Because the photocurable compositions according to the invention have low yellowing properties, both thermally and photochemically, they are suitable for the production of microlens arrays as described above.
The novel radiation-sensitive compositions are also suitable for photo-lithographic steps used in the production process of plasma display panels (PDP), particularly for the imaging forming process of barrier rib, phosphor layer and electrodes.
The PDP is a planar display for displaying images and information by virtue of the emission of light by gas discharge. By the construction of panel and the method of operation, it is known in two types, i.e. DC (direct current) type and AC (alternating current) type.
By way of example, the principle of the DC type color PDP will be briefly explained. In the DC type color PDP, the space intervening between two transparent substrates (generally glass plates) is divided into numerous minute cells by latticed barrier ribs interposed between the transparent substrates. In the individual cells a discharge gas, such as He or Xe, is sealed. On the rear wall of each cell there is a phosphor layer which, on being excited by the ultraviolet light generated by the discharge of the discharge gas, emits visible light of three primary colors. On the inner faces of the two substrates, electrodes are disposed as opposed to each other across the relevant cells. Generally, the cathodes are formed of a film of transparent electroconductive material such as NESA glass. When a high voltage is applied between these electrodes formed on the fore wall and the rear wall, the discharge gas which is sealed in the cells induces plasma discharge and, by virtue of the ultraviolet light radiated consequently, incites the fluorescent elements of red, blue, and green colors to emit lights and effect the display of an image. In the full-color display system, three fluorescent elements severally of the three primary colors of red, blue, and green mentioned above jointly form one picture element.
The cells in the DC type PDP are divided by the component barrier ribs of a lattice, whereas those in the AC type PDP are divided by the barrier ribs which are arranged parallel to each other on the faces of the substrates. In either case, the cells are divided by barrier ribs. These barrier ribs are intended to confine the luminous discharge within a fixed area to preclude false discharge or cross talk between adjacent discharge cells and ensure ideal display.
The compositions according to the invention also find application for the production of one- or more-layered materials for the image recording or image reproduction (copies, reprography), which may be mono- or polychromatic. Furthermore the materials are suitable for color proofing systems. In this technology formulations containing microcapsules can be applied and for the image production the radiation curing can be followed by a thermal treatment. Such systems and technologies and their applications are for example disclosed in U.S. Pat. No. 5,376,459.
The compounds of the formula I, II and III are also suitable as photoinitiators in the holographic data storage application. Said photoinitiators generate radicals and initiate polymerization of monomer upon irradiation with blue laser radiation, suitable for holographic data storage. The wavelength range of the blue laser is 390-420 nm, preferably 400-410 nm and particularly 405 nm. Holographic storage systems (holographic recording media) are for example used to record and to retrieve a large amount of data with fast access time. The photoinitiators of the invention are for example in particular suitable for systems as described for example in WO 03/021358.
The holographic data storage system is preferably comprised of a matrix network of low-refractive index matrix precursors and high-refractive index photopolymerizable monomers.
The matrix precursor and photoactive monomer can be selected such that (a) the reaction by which the matrix precursor is polymerized during the cure is independent from the reaction by which the photoactive monomer will be polymerized during writing of a pattern, e.g. data, and (b) the matrix polymer and the polymer resulting from polymerization of the photoactive monomer (the photopolymer) are compatible with each other. The matrix is considered to be formed when the photorecording material, i.e. the matrix material plus the photoactive monomer, photoinitiator and/or additives, exhibits an elastic modulus of at least about 105 Pa, generally about 105 Pa to about 109 Pa.
The media matrix is formed by in-situ polymerization which yields as cross-linked network in the presence of the photopolymerizable monomers which remain “dissolved” and unreacted. The matrix containing unreacted, photopolymerizable monomers can also be formed by other means, for example by using a solid-resin matrix material in which the photoreactive, liquid monomer is homogeneously distributed. Then, monochromatic exposure generates the holographic pattern, which according to the light intensity distribution, polymerizes the photoreactive monomers in the solid pre-formed matrix. The unreacted monomers (where light intensity was at a minimum) diffuse through the matrix, producing a modulation of the refractive index that is determined by the difference between the refractive indices of the monomer and the matrix and by the relative volume fraction of the monomer. The thickness of the recording layer is in the range of several micrometers up to a thickness of one millimeter. Because of such thick holographic data storage layers it is required that the photoinitiator combines high photoreactivity with low absorbance, in order to render the layer transparent at the laser wavelength to assure that the extent of photopolymerization is as little as possible dependent on the exposure depth into the recording layer.
It was found that the photoinitiators of the present invention combine high reactivity with low absorbance at 405 nm and are suitable for this application. Dyes and sensitizers can also be added to the formulations. Suitable dyes and sensitizers for blue laser radiation are for example coumarines, xanthones, thioxanthones, see list above.
In particular relevant are thioxanthones, coumarins and benzophenones as mentioned under items 1, 2. and 3. in the list given above.
It was found that the photoinitiators allow photopolymerization of monomers in thick layers, such as required for holographic data storage, with high sensitivity and yield recording layers which are sensitive to blue laser radiation. The photoinitiators, when applied at a concentration of 2-8 wt % in the photosensitive layer of 20 micron thickness yield an absorbance of the layer which comprises the photoinitiator, of less than 0.4, preferably less than 0.2 at the laser wavelength.
The photoinitiators are in particular suitable for the preparation of optical articles (for example optical waveguides) or holographic recording media e.g. comprising a polymer and an organic photoinitiator as described above, having a maximum absorption at a UV wavelength in the range of 340-450 nm, wherein the refractive index contrast adjusted sensitivity is greater than 3×10−6 Δn/(mJ/cm2). For example, the polymer is formed by polymerizing a material comprising component 1 and component 2, wherein component 1 comprises a NCO-terminated pre-polymer and component 2 comprises a polyol. Component 1 is, for example, diphenylmethane diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, a derivative of hexamethylene diisocyanate, a methylenebiscyclohexylisocyanate, a derivative of methylenebiscyclohexylisocyanate. Component 2 is for example a polyol of propylene oxide. Preferably, the photoactive monomer is an acrylate monomer. In such media the shrinkage induced by writing is usually less than 0.25%.
Photocuring further is of great importance for printings, since the drying time of the ink is a critical factor for the production rate of graphic products, and should be in the order of fractions of seconds. UV-curable inks are particularly important for screen printing and offset inks.
As already mentioned above, the novel mixtures are highly suitable also for producing printing plates. This application uses, for example, mixtures of soluble linear polyamides or styrene/butadiene and/or styrene/isoprene rubber, polyacrylates or polymethyl methacrylates containing carboxyl groups, polyvinyl alcohols or urethane acrylates with photopolymerizable monomers, for example acrylamides and/or methacrylamides, or acrylates and/or methacrylates, and a photoinitiator. Films and plates of these systems (wet or dry) are exposed over the negative (or positive) of the printed original, and the uncured parts are subsequently washed out using an appropriate solvent or aqueous solutions.
Another field where photocuring is employed is the coating of metals, in the case, for example, of the coating of metal plates and tubes, cans or bottle caps, and the photocuring of polymer coatings, for example of floor or wall coverings based on PVC.
Examples of the photocuring of paper coatings are the colourless varnishing of labels, record sleeves and book covers.
Also of interest is the use of the novel photoinitiators for curing shaped articles made from composite compositions. The composite compound consists of a self-supporting matrix material, for example a glass fibre fabric, or alternatively, for example, plant fibres [cf. K.-P. Mieck, T. Reussmann in Kunststoffe 85 (1995), 366-370], which is impregnated with the photocuring formulation. Shaped parts comprising composite compounds, when produced using the novel compounds, attain a high level of mechanical stability and resistance. The novel compounds can also be employed as photocuring agents in moulding, impregnating and coating compositions as are described, for example, in EP7086. Examples of such compositions are gel coat resins, which are subject to stringent requirements regarding curing activity and yellowing resistance, and fibre-reinforced mouldings, for example, light diffusing panels which are planar or have lengthwise or crosswise corrugation. Techniques for producing such mouldings, such as hand lay-up, spray lay-up, centrifugal casting or filament winding, are described, for example, by P. H. Selden in “Glasfaserverstärkte Kunststoffe”, page 610, Springer Verlag Berlin-Heidelberg-New York 1967. Examples of articles which can be produced by these techniques are boats, fibre board or chipboard panels with a double-sided coating of glass fibre-reinforced plastic, pipes, containers, etc. Further examples of moulding, impregnating and coating compositions are UP resin gel coats for mouldings containing glass fibres (GRP), such as corrugated sheets and paper laminates. Paper laminates may be based on urea resins or melamine resins. Prior to production of the laminate, the gel coat is produced on a support (for example a film). The novel photocurable compositions can also be used for casting resins or for embedding articles, for example electronic components, etc.
The compositions and compounds according to the invention can be used for the production of holographies, waveguides, optical switches wherein advantage is taken of the development of a difference in the index of refraction between irradiated and unirradiated areas.
The use of photocurable compositions for imaging techniques and for the optical production of information carriers is also important. In such applications, as already described above, the layer (wet or dry) applied to the support is irradiated imagewise, e.g. through a photomask, with UV or visible light, and the unexposed areas of the layer are removed by treatment with a developer. Application of the photocurable layer to metal can also be carried out by electrodeposition. The exposed areas are polymeric through crosslinking and are therefore insoluble and remain on the support. Appropriate colouration produces visible images. Where the support is a metallized layer, the metal can, following exposure and development, be etched away at the unexposed areas or reinforced by electroplating. In this way it is possible to produce electronic circuits and photoresists. When used in image-forming materials the novel photoinitiators provide excellent performance in generating so called printout images, whereby a color change is induced due to irradiation. To form such printout images different dyes and/or their leuco form are used and examples for such print out image systems can be fount e.g. in WO96/41240, EP706091, EP511403, U.S. Pat. No. 3,579,339 and U.S. Pat. No. 4,622,286.
The novel photoinitiator is also suitable for a photopatternable composition for forming a dielectric layer of a multilayer layer circuit board produced by a sequential build-up process.
The invention, as described above, provides compositions for producing pigmented and non-pigmented paints and varnishes, powder coatings, printing inks, printing plates, adhesives, pressure-sensitive adhesives, dental compositions, gel coats, photoresists for electronics, electroplating resist, etch resist, both liquid and dry films, solder resist, as resists to manufacture color filters for a variety of display applications, to generate structures in the manufacturing processes of plasma-display panels (e.g. barrier rib, phosphor layer, electrode), electroluminescence displays and LCD (e.g. interlayer insulating layer, spacers, microlens array), for holographic data storage (HDS), as composition for encapsulating electrical and electronic components, for producing magnetic recording materials, micromechanical parts, waveguides, optical switches, plating masks, etch masks, colour proofing systems, glass fibre cable coatings, screen printing stencils, for producing three-dimensional objects by means of stereolithography, and as image recording material, for holographic recordings, microelectronic circuits, decolorizing materials, decolorizing materials for image recording materials, for image recording materials using microcapsules, as a photoresist material used for forming dielectric layers in a sequential build-up layer of a printed circuit board.
Substrates used for photographic information recordings include, for example, films of polyester, cellulose acetate or polymer-coated papers; substrates for offset printing formes are specially treated aluminium, substrates for producing printed circuits are copper-clad laminates, and substrates for producing integrated circuits are, for example, silicon wafers. The layer thickness of the photosensitive layer for photographic materials and offset printing forms is generally from about 0.5 μm to 10 μm, while for printed circuits it is from 0.1 μm to about 100 μm. Following the coating of the substrates, the solvent is removed, generally by drying, to leave a coat of the photoresist on the substrate.
Coating of the substrates can be carried out by applying to the substrate a liquid composition, a solution or a suspension. The choice of solvents and the concentration depend principally on the type of composition and on the coating technique. The solvent should be inert, i.e. it should not undergo a chemical reaction with the components and should be able to be removed again, after coating, in the course of drying. Examples of suitable solvents are ketones, ethers and esters, such as methyl ethyl ketone, isobutyl methyl ketone, cyclopentanone, cyclohexanone, N-methylpyrrolidone, dioxane, tetrahydrofuran, 2-methoxyethanol, 2-ethoxyethanol, 1-methoxy-2-propanol, 1,2-dimethoxyethane, ethyl acetate, n-butyl acetate, ethyl 3-ethoxypropionate, 2-methoxypropylacetate, methyl-3-methoxypropionate, 2-heptanone, 2-pentanone, and ethyl lactate.
The solution is applied uniformly to a substrate by means of known coating techniques, for example by spin coating, dip coating, knife coating, curtain coating, brushing, spraying, especially by electrostatic spraying, and reverse-roll coating, and also by means of electrophoretic deposition. It is also possible to apply the photosensitive layer to a temporary, flexible support and then to coat the final substrate, for example a copper-clad circuit board, or a glass substrate by transferring the layer via lamination.
The quantity applied (coat thickness) and the nature of the substrate (layer support) are dependent on the desired field of application. The range of coat thicknesses generally comprises values from about 0.1 μm to more than 100 μm, for example 0.1 μm to 1 cm, preferably 0.5 μm to 1000 μm.
Following the coating of the substrates, the solvent is removed, generally by drying, to leave an essentially dry resist film of the photoresist on the substrate.
The photosensitivity of the novel compositions can extend in general from about 150 nm to 600 nm, for example 190-600 nm, (UV-vis region). Suitable radiation is present, for example, in sunlight or light from artificial light sources. Consequently, a large number of very different types of light sources are employed. Both point sources and arrays (“lamp carpets”) are suitable. Examples are carbon arc lamps, xenon arc lamps, low-, medium-, high- and super high-pressure mercury lamps, possibly with metal halide dopes (metal-halogen lamps), microwave-stimulated metal vapour lamps, excimer lamps, superactinic fluorescent tubes, fluorescent lamps, argon incandescent lamps, electronic flashlights, photographic flood lamps, light emitting diodes (LED), electron beams and X-rays. The distance between the lamp and the substrate to be exposed in accordance with the invention may vary depending on the intended application and the type and output of lamp, and may be, for example, from 2 cm to 150 cm. Laser light sources, for example excimer lasers, such as F2 excimer lasers at 157 nm exposure, KrF excimer lasers for exposure at 248 nm and ArF excimer lasers for exposure at 193 nm are also suitable. Lasers in the visible region can also be employed.
The term “imagewise” exposure includes both, exposure through a photomask comprising a predetermined pattern, for example a slide, a chromium mask, a stencil mask or a reticle, as well as exposure by means of a laser or light beam, which for example is moved under computer control over the surface of the coated substrate and in this way produces an image. Suitable UV laser exposure systems for the purpose are, for example, provided by Etec and Orbotech (DP-100TM DIRECT IMAGING SYSTEM). Other examples of laser light sources are, for example excimer lasers, such as F2 excimer lasers at 157 nm exposure, KrF excimer lasers for exposure at 248 nm and ArF excimer lasers for exposure at 193 nm. Further suitable are solid state UV lasers (e.g. Gemini from ManiaBarco, DI-2050 from PENTAX) and violet laser diodes with 405 nm output (DI-2080, DI-PDP from PENTAX). Lasers in the visible region can also be employed. And the computer-controlled irradiation can also be achieved by electron beams. It is also possible to use masks made of liquid crystals that can be addressed pixel by pixel to generate digital images, as is, for example, described by A. Bertsch, J. Y. Jezequel, J. C. Andre in Journal of Photochemistry and Photobiology A: Chemistry 1997, 107, p. 275-281 and by K.-P. Nicolay in Offset Printing 1997, 6, p. 34-37.
Following the imagewise exposure of the material and prior to development, it may be advantageous to carry out thermal treatment for a short time. After the development a thermal post bake can be performed to harden the composition and to remove all traces of solvents. The temperatures employed are generally 50-250° C., preferably 80-220° C.; the duration of the thermal treatment is in general between 0.25 and 60 minutes.
The photocurable composition may additionally be used in a process for producing printing plates or photoresists as is described, for example, in DE4013358. In such a process the composition is exposed for a short time to visible light with a wavelength of at least 400 nm, without a mask, prior to, simultaneously with or following imagewise irradiation.
After the exposure and, if implemented, thermal treatment, the unexposed areas of the photosensitive coating are removed with a developer in a manner known per se.
As already mentioned, the novel compositions can be developed by aqueous alkalis or organic solvents. Particularly suitable aqueous-alkaline developer solutions are aqueous solutions of tetraalkylammonium hydroxides or of alkali metal silicates, phosphates, hydroxides and carbonates. Minor quantities of wetting agents and/or organic solvents may also be added, if desired, to these solutions. Examples of typical organic solvents, which may be added to the developer liquids in small quantities, are cyclohexanone, 2-ethoxyethanol, toluene, acetone and mixtures of such solvents. Depending on the substrate also solvents, e.g. organic solvents, can be used as developer, or, as mentioned above mixtures of aqueous alkalis with such solvents. Particularly useful solvents for solvent development include methanol, ethanol, 2-propanol, 1-propanol, butanol, diacetone alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-butyl ether, diethyleneglycol dimethyl ether, propyleneglycol monomethyl ether acetate, ethyl-3-ethoxypropionate, methyl-3-methoxypropionate, n-butyl acetate, benzyl alcohol, acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone, 2-pentanone, epsilon-caprolactone, gamma-butylolactone, dimethylformamide, dimethylacetamide, hexamethylphosphoramide, ethyl lactate, methyl lactate, epsilon-caprolactam, and N-methyl-pyrrolidinone. Optionally, water can be added to these solvents up to a level at which still a clear solution is obtained and at which sufficient solubility of the unexposed areas of the light sensitive composition is maintained.
The invention therefore also provides a process for the photopolymerization of compounds containing ethylenically unsaturated double bonds, i.e. monomeric, oligomeric or polymeric compounds containing at least one ethylenically unsaturated double bond, which comprises irradiating a composition as described above with electromagnetic radiation in the range from 150 to 600 nm, or with electron beam or with X-rays.
In other words, adding to these compounds containing ethylenically unsaturated double bonds at least one photoinitiator of the formula I, II or III as described above and irradiating the resulting composition with electromagnetic radiation, in particular light of the wavelength 150 to 600 nm, in particular 190-600 nm, with electron beam, or with X-rays.
The invention further provides a coated substrate which is coated on at least one surface with a composition as described above, and describes a process for the photographic production of relief images, in which a coated substrate is subjected to imagewise exposure and then the unexposed portions are removed with a developer. Imagewise exposure may be effected by irradiating through a mask or by means of a laser or electron beam as already described above. Of particular advantage in this context is the laser beam exposure already mentioned above.
The compounds of the invention have a good thermal stability and low volatility, and are also suitable for photopolymerisations in the presence of air (oxygen). Further, they cause only low yellowing in the compositions after photopolymerization.
The examples which follow illustrate the invention in more detail. Parts and percentages are, as in the remainder of the description and in the claims, by weight, unless stated otherwise.
Where alkyl radicals having more than three carbon atoms are referred to in the following examples without any mention of specific isomers, the n-isomers are meant in each case.


EXAMPLE 1
Synthesis of




1.a 1-(4-Carbazol-9-yl-phenyl)ethanone
To carbazole (5.02 g) in dimethylsulfoxide (DMSO) (50 mL) is added 4-fluoroacetophenone (3.45 g) and K2CO3 (10.4 g), and the mixture is stirred at 135° C. overnight. The mixture is poured into water to afford a precipitate, which is isolated by filtration and washed with water. The crude product thus obtained is further purified by recrystallization from tert-butyl methyl ether (TBME), giving the product as a light brown solid.
The structure is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 2.71 (s, 3H), 7.32 (ddd, 2H), 7.41-7.50 (m, 4H), 7.72 (d, 2H), 8.15 (d, 2H), 8.21 (d, 2H).
1.b. (E)-1-[9-(4-Acetyl-phenyl)-6-(thiophene-2-carbonyl)-carbazol-3-yl]-but-2-en-1-one
To 1-(4-carbazol-9-yl-phenyl)ethanone (30.0 g) in CH2Cl2 (1200 mL) is added thiophenecarbonyl chloride (15.4 g) and AlCl3 (28.4 g) at 0° C. After stirring overnight at room temperature, crotonyl chloride (11.3 g) and AlCl3 (15.5 g) are further added at 0° C. and the mixture is stirred at room temperature overnight. The reaction mixture is poured into ice-water, and the crude product is extracted twice with CH2Cl2. The combined organic layer is washed with H2O and brine, dried over MgSO4, and concentrated to give the residue, which is purified by washing with hot ethyl acetate.
The structure of the product, which is obtained as a white solid, is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 2.06 (d, 3H), 2.73 (s, 3H), 7.13-7.17 (m, 2H), 7.24 (t, 1H), 7.48 (d, 1H), 7.51 (d, 1H), 7.71-7.78 (m, 4H), 8.07 (d, 1H), 8.13 (d, 1H), 8.27 (d, 2H), 8.79 (s, 1H), 8.82 (s, 1H).
1.c. N-Acetyloxy-N-{3-[9-{4-(1-acetoxyiminoethyl)-phenyl}-6-(2-thiophenecarbonyl)-carbazole-3-yl]-1-methyl-3-oxo-propyl}-acetoamide
This compound is synthesized by a similar procedure as disclosed in WO2005-080337A1 with the compound obtained according to example 1.b. and the corresponding reagents. The structure of the product, which is obtained as a slightly yellowish solid, is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 1.36 (bd, 3H), 1.90-2.20 (bs, 3H), 2.26 (s, 3H), 2.32 (s, 3H), 2.52 (s, 3H), 3.24 (bs, 1H), 3.59 (dd, 1H), 5.11 (bs, 1H), 7.24 (dd, 1H), 7.44 (d, 1H), 7.48 (d, 1H), 7.65 (d, 2H), 7.75-7.79 (m, 2H), 8.02-8.10 (m, 3H), 8.13 (d, 1H), 8.81 (s, 1H), 8.84 (s, 1H).
EXAMPLE 2
Synthesis of




This compound is synthesized according to the procedure as disclosed in example 1 and WO2005-080337A1 with 1-(4-Carbazol-9-yl-phenyl)ethanone and the corresponding reagents.
EXAMPLE 3
Synthesis of




3.a. [9-Ethyl-6-(2-methyl-benzoyl)-carbazol-3-yl]-(4-fluoro-phenyl)-methanone
To N-ethylcarbazol (8.0 g) in CH2Cl2 (200 mL) is added 4-fluorobenzoyl chloride (6.5 g) and AlCl3 (5.6 g) at 0° C. After stirring overnight at room temperature, 2-toluoyl chloride (6.5 g) and AlCl3 (6.0 g) are further added at 0° C. and the mixture is stirred at room temperature overnight. The reaction mixture is poured into ice-water, and the crude product is extracted twice with CH2Cl2. The combined organic layer is washed with H2O and brine, dried over MgSO4, and concentrated to give the residue, which is used for the next step without further purification. The structure of the product, which is obtained as a beige solid, is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 1.52 (t, 3H), 2.35 (s, 3H), 4.46 (q, 2H), 7.20 (t, 2H), 7.27-7.46 (m, 4H), 7.50 (t, 2H), 7.86 (d, 1H), 7.88 (d, 1H), 8.02 (d, 1H), 8.07 (d, 1H), 8.54 (s, 1H), 8.55 (s, 1H).
3.b. (4-Carbazol-9-yl-phenyl)-[9-ethyl-6-(2-methyl-benzoyl)-carbazol-3-yl]-methanone
To carbazole (13.7 g) in NMP (100 mL) is added the compound as obtained in example 3.a (17.8 g) and K2CO3 (17.0 g), and the mixture is stirred at 150° C. for 2 days. The reaction mixture is poured into ice-water, which is then neutralized with HCl to give a neutral pH. The crude product is extracted from the mixture twice with CH2Cl2. The combined organic layer is washed with H2O and brine, dried over MgSO4, and concentrated to give the residue, which is purified by recrystallization from ethyl acetate.
The structure of the product, which is obtained as a white solid, is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 1.53 (t, 3H), 2.36 (s, 3H), 4.48 (q, 2H), 7.28-7.51 (m, 9H), 7.54-7.59 (m, 3H), 7.76 (d, 2H), 8.06-8.18 (m, 6H), 8.63 (s, 1H), 8.69 (s, 1H).
3.c. (E)-1-(9-{4-[9-Ethyl-6-(2-methyl-benzoyl)-carbazole-3-carbonyl]-phenyl}-carbazol-3-ylybut-2-en-1-one
To the compound obtained in example 3.b. (13.9 g) in CH2Cl2 (200 mL) are added crotonyl chloride (2.5 g) and AlCl3 (9.6 g) at 0° C. and the mixture is stirred at room temperature overnight. The reaction mixture is poured into ice-water, and the crude product is extracted twice with CH2Cl2. The combined organic layer is washed with H2O and brine, dried over MgSO4, and concentrated to give the residue, which is used for the next step without further purification. The structure of the product, which is obtained as a beige solid, is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 1.54 (t, 3H), 2.07 (d, 3H), 2.36 (s, 3H), 4.48 (q, 2H), 7.15-7.18 (m, 2H), 7.28-7.59 (m, 10H), 7.75 (d, 2H), 8.06 (d, 1H), 8.10-8.18 (m, 4H), 8.24 (d, 1H), 8.64 (s, 1H), 8.69 (s, 1H), 8.82 (s, 1H).
The compound of example 3 is synthesized according to the procedure as disclosed in WO2005-080337A1 with the compound of example 3.c. and the corresponding reagents.
The structure of the product, which is obtained as a slightly yellowish solid, is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 1.24 (d, 3H), 1.53 (t, 3H), 1.91 (bs, 3H), 2.26 (s, 3H), 2.35 (s, 3H), 2.36 (s, 3H), 3.38 (m, 2H), 4.48 (q, 2H), 4.97 (bs, 1H), 7.26-7.60 (m, 10H), 7.75 (d, 2H), 7.93 (d, 1H), 8.03-8.17 (m, 4H), 8.24 (d, 1H), 8.64 (s, 2H), 8.69 (s, 1H).
EXAMPLE 4
Synthesis of




This compound is synthesized according to the procedure as disclosed in example 3 and WO2005-080337A1 with the corresponding reagents.
EXAMPLE 5
Synthesis of




This compound is synthesized according to the procedure as disclosed in example 3 with the corresponding reagents.
EXAMPLE 6
Synthesis of




This compound is synthesized according to the procedure as disclosed in WO2005-080337A1 and WO2006-018405A1 with the corresponding reagents.
EXAMPLE 7
Synthesis of




7.a (4-Carbazol-9-yl-phenyl)-phenyl-methanone
The compound 7.a is synthesized as described in example 1.a with 4-fluorobenzophenone in stead of 4-fluoroacetophenone. The structure is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 7.32 (t, 2H), 7.44 (t, 2H), 7.51-7.57 (m, 4H), 7.64 (t, 1H), 7.72 (d, 2H), 7.90 (d, 2H), 8.07 (d, 2H), 8.15 (d, 2H).
7.b 1-[9-(4-Benzoyl-phenyl)-9H-carbazol-3-yl]-4-chloro-butan-1-one
The compound 7.b is synthesized with 7.a and 4-chlorobutyryl chloride in the presence of aluminium chloride as described in example 1.b. The structure is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 2.32 (quint, 2H), 3.35 (t, 2H), 3.75 (t, 2H), 7.40 (m, 1H), 7.50-7.59 (m, 5H), 7.66 (t, 1H), 7.73 (d, 2H), 7.92 (d, 2H), 8.09-8.14 (m, 3H), 8.23 (d, 1H), 8.83 (s, 1H).
7.c 1-[9-(4-Benzoyl-phenyl)-9H-carbazol-3-yl]-4-(benzothiazol-2-ylsulfanyl)-butan-1-one
The compound 7.c is synthesized with 7.b and 2-mercaptobenzothiazole in the presence of potassium carbonate as described in example 1.a. The structure is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 2.40 (quint, 2H), 3.37 (t, 2H), 3.55 (t, 2H), 7.34-7.42 (m, 2H), 7.46-7.59 (m, 6H), 7.64-7.75 (m, 4H), 7.81 (d, 1H), 7.92 (d, 2H), 8.08-8.13 (m, 3H), 8.18 (d, 1H), 8.79 (s, 1H).
7.d 1-[9-(4-Benzoyl-phenyl)-9H-carbazol-3-yl]-4-(benzothiazol-2-ylsulfanyl)-butan-1-one oxime O-acetate
The ketone 7.c is transformed to the corresponding oxime acetate 7.d according to the procedure in example 1.c. The structure is confirmed by the 1H-NMR spectrum (CDCl3). δ [ppm]: 2.24 (quint, 2H), 2.28 (s, 3H), 3.22 (t, 2H), 3.47 (t, 2H), 7.32-7.39 (m, 2H), 7.45-7.59 (m, 6H), 7.64-7.73 (m, 4H), 7.80 (d, 1H), 7.85 (d, 1H), 7.92 (d, 2H), 8.08 (d, 2H), 8.15 (d, 1H), 8.55 (s, 1H).
EXAMPLE 8
Synthesis of




This compound is synthesized according to the procedure as disclosed in example 7 and WO2005-080337A1 with the corresponding reagents.
EXAMPLE 9
Synthesis of




This compound is synthesized according to the procedure as disclosed in example 6 and example 7 with the corresponding reagents.
EXAMPLE 10
Synthesis of




This compound is synthesized according to the procedure as disclosed in example 4 and JP2005-54012A with the corresponding reagents.
EXAMPLE 11
Preparation of Poly(Benzylmethacrylate-co-Methacrylic Acid)
24 g of benzylmethacrylate, 6 g of methacrylic acid and 0.525 g of azobisisobutyronitrile (AIBN) are dissolved in 90 ml of propylene glycol 1-monomethyl ether 2-acetate (PGMEA). The resulting reaction mixture is placed in a preheated oil bath at 80° C. After stirring for 5 hours at 80° C. under nitrogen, the resulting viscous solution is cooled to room temperature and used without further purification. The solid content is about 25%.
EXAMPLE 12
Sensitivity Tests
A photocurable composition for a sensitivity test is prepared by mixing the following components:

    
    
        200.0 parts by weight of copolymer of benzylmethacrylate and methacrylic acid (benzylmethacrylate:methacrylic acid=80:20 by weight) 25% propylene glycol 1-monomethyl ether 2-acetate (PGMEA) solution, prepared in above example
        50.0 parts by weight of dipentaerythritol hexaacrylate ((DPHA), provided by UCB Chemicals),
    
    


0.1 parts by weight of photoinitiator, and
150.0 parts by weight of PGMEA
All operations are carried out under yellow light. The compositions are applied to an aluminum plate using an electric applicator with a wire wound bar. The solvent is removed by heating at 100° C. for 2 minutes in a convection oven. The thickness of the dry film is approximately 2 μm. A standardized test negative film with 21 steps of different optical density (Stouffer step wedge) is placed with an air gap of around 100 μm between the film and the resist. Exposure is carried out using a 250W super high pressure mercury lamp (USHIO, USH-250BY) at a distance of 15 cm. A total exposure dose measured by an optical power meter (ORC UV Light Measure Model UV-MO2 with UV-35 detector) on the test negative film is 250 mJ/cm2. After exposure, the exposed film is developed with an alkaline solution (5% aqueous solution of DL-A4, Yokohama Yushi) for 100 sec. at 28° C. by using a spray type developer (AD-1200, Takizawa Sangyo). The sensitivity of the initiator system used is characterized by indicating the highest number of the step remained (i.e. polymerized) after developing. The higher the number of steps, the more sensitive is the system tested. The results are listed in table 1.










TABLE 1








Highest number



Photoinitiator
of steps









Example 1
7










EXAMPLE 13
Sensitivity Tests in Black Matrix Resist


    
    
        20.0 parts by weight of REGAL 400R (carbon black, provided by CABOT)
        20.0 parts by weight of EFKA 4046 (dispersant, provided by Ciba)
        93.3 parts by weight of PGMEA
    
    


A black color dispersion is prepared by mixing the above components and dispersing them by using a Paint conditioner (SKANDEX) for 1.5 hours. The binder polymer solution (48.0 parts by weight) described in the above example is mixed with the dispersion by the Paint conditioner and further DPHA (7.0 parts by weight, dipentaerythritol hexaacrylate, provided by UCB Chemicals) and PGMEA (46.7 parts by weight) are added. The photoinitiators to be tested are added to the resist composition. The black matrix resists thus prepared are applied on a glass substrate by means of a spin coater. The coated substrates are dried at 80° C. for 10 min. The thickness of the dry film is approximately 1.1 μm. A standardized test negative mask with 9 steps of different optical density (EIA GRAY SCALE, EDMUND SCIENTIFIC) is placed on the resist. Exposure is carried out using a 250W super high pressure mercury lamp (USHIO, USH-250BY) at a distance of 15 cm. A total exposure dose measured by an optical power meter (ORC UV Light Measure Model UV-MO2 with UV-35 detector) on the test negative mask is 300 mJ/cm2. After exposure, the exposed film is developed with an alkaline solution (5% aqueous solution of DL-A4, Yokohama Yushi) at 28° C. by using a spray type developer (AD-1200, Takizawa Sangyo). The sensitivity of the photoinitiator is characterized by indicating the highest number of the step remained (i.e. polymerized) after developing. The higher the number of steps, the more sensitive is the photoinitiator tested. The results are listed in the following table 2.










TABLE 2








Highest number



Photoinitiator
of steps









Example 3
7



Example 7
8

## Claims

1. A compound of the formula I, II or III




wherein
R2 is hydrogen, C1-C20alkyl which C1-C20alkyl optionally contains one or more C—C multiple bonds;
C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14 and which uninterrupted or interrupted C3-C10cycloalkyl optionally contains one or more C—C multiple bonds;
or R2 is C1-C20cycloalkyl which is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O,C1-C20heteroaryl-S, CONR12R13,





phenyl or by phenyl which is substituted by SR10, OR11 or NR12R13, which substituted C1-C20alkyl optionally contains one or more C—C multiple bonds;
or R2 is C2-C20alkyl which is interrupted by one or more O and/or optionally is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,




 phenyl or by phenyl which is substituted by SR10, OR11, or NR12R13, which interrupted C2-C20alkyl optionally contains C—C multiple bonds;
or R2 is unsubstituted phenyl, naphthyl or C1-C20heteroaryl; or are phenyl, naphthyl or C1-C20heteroaryl which is substituted by one or more C1-C12alkyl, C2-C12alkenyl, C2-C12alkynyl, phenyl, halogen, CN, NO2, SR10, OR11, NR12R13 or by C3-C10cycloalkyl which optionally is interrupted by O,CO or NR14; 
or R2 is C2-C20alkanoyl, or benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, phenyl, SR10, OR11 or NR12R13; 
or R2 is C2-C12alkoxycarbonyl which optionally is interrupted by one or more O and/or optionally is substituted by one or more OH;
or R2 is phenoxycarbonyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, phenyl, SR10, OR11 or NR12R13; 
or R2 is are NR12R13 or




or R2 is form a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group




 is attached, wherein said formed ring is unsubstituted or substituted;
R′′2 has one of the meanings given for R2 or is




R′′′2 has one of the meanings given for R2 or is




R1 is hydrogen, (CO)R′′2, C1-C20alkoxycarbonyl, phenyl-C1-C4alkyl, C1-C20alkyl which optionally is substituted by one or more halogen, COOR11 or CONR12R13;
or R1 is C2-C20alkyl which is interrupted by O, CO or NR14; or is C2-C12alkenyl which optionally is interrupted by O, CO or NR14, or is C4-C8cycloalkenyl or C2-C12alkinyl;
or R1 is benzoyl, naphthoyl, phenyloxycarbonyl or naphtyloxycarbonyl; or is benzoyl, naphthoyl, phenyloxycarbonyl or naphtyloxycarbonyl each of which is substituted by one or more C1-C20alkyl, C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R1 is C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or is C3-C10cycloalkylcarbonyl which optionally is interrupted by O, CO or NR14, or is C3-C10cyclo-alkyloxycarbonyl which optionally is interrupted by O, CO or NR14;
or R1 is unsubstituted phenyl or naphthyl, or is phenyl or naphthyl which is substituted by one or more C1-C20alkyl, C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2, or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
R6, R7, R8, R′6, R′7, R′8, R′′6, R′′7, R′′′6 and R′′′7 independently of one another are hydrogen, halogen,




 C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or are C2-C12alkenyl which optionally is interrupted by O, CO or NR14, or are C4-C8cycloalkenyl, C2-C12alkinyl, phenyl-C1-C4alkyl, CN, NO2 or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R6, R7, R8, R′6, R′7, R′8, R′′6, R′′7, R′′′6 and R′′′7 are phenyl which is unsubstituted or substituted by one or more C1-C20alkyl, halogen, CN, SR10, OR11 or NR12R13;
or R6, R7, R8, R′6, R′7, R′8, R′′6, R′′7, R′′′6 and R′′′7 are (CO)R′2, SR10, OR11, SOR10, SO2R10 or NR12R13, wherein the substituents (CO)R′2, OR11, SR10 and NR12R13 optionally form 5- or 6-membered rings via the radicals R10, R11, R12 R13, and/or R′2 with further substituents on the phenyl ring or with one of the carbon atoms of the phenyl ring;
or R′′6 and R′′7 in formula II together are C1-C6alkylene or C2-C6alkenylene to form a bicyclic ring together with the phenyl to which they are attached, wherein said bicyclic ring optionally is substituted by one or more C1-C20alkyl, or by C2-C20alkyl which is interrupted by O, CO or NR14, or said bicyclic ring optionally is substituted by C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2, or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14; provided that the group




 is attached to either ring;
or R′′′6 and R′′′7 in formula III together are C2-C6alkylene or C2-C6alkenylene to form a bicyclic ring together with the phenyl to which they are attached, wherein said bicyclic ring optionally is substituted by one or more C1-C20alkyl, by C2-C20alkyl which is interrupted by O, CO or NR14, or said bicyclic ring optionally is substituted by C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2, or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
provided that one or more groups (CO)R′′′2 are attached to either ring;
R′2 is hydrogen, C1-C20alkyl which C1-C20alkyl optionally contains one or more C—C multiple bonds;
C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14 and which uninterrupted or interrupted C3-C10cycloalkyl optionally contains one or more C—C multiple bonds;
or R2 and R′2 are C1-C20alkyl which is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,




 phenyl or by phenyl which is substituted by SR10, OR11 or NR12R13, which substituted C1-C20alkyl optionally contains one or more C—C multiple bonds;
or R2 and R′2 are C2-C20alkyl which is interrupted by one or more O and/or optionally is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,




 phenyl or by phenyl which is substituted by SR10, OR11, or NR12R13, which interrupted C2-C20alkyl optionally contains C—C multiple bonds;
or R2 and R′2 are unsubstituted phenyl, naphthyl or C1-C20heteroaryl; or are phenyl, naphthyl or C1-C20heteroaryl which is substituted by one or more C1-C12alkyl, C2-C12alkenyl, C2-C12alkynyl, phenyl, halogen, CN, NO2, SR10, OR11, NR12R13 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R2 and R′2 are C2-C20alkanoyl, or benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, phenyl, SR10, OR11 or NR12R13;
or R2 and R′2 are C2-C12alkoxycarbonyl which optionally is interrupted by one or more O and/or optionally is substituted by one or more OH;
or R2 and R′2 are phenoxycarbonyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, phenyl, SR10, OR11 or NR12R13;
or R2 and R′2 are NR12R13 or




or R2 and R′2 form a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group (CO)R′2 is attached, wherein said formed ring is unsubstituted or substituted;
R9 is hydrogen, C3-C8cycloalkyl, C2-C5alkenyl, C1-C20alkoxy, unsubstituted C1-C20alkyl or C1-C20alkyl which is substituted by one or more halogen, phenyl, C1-C20alkylphenyl and/or CN;
or R9 is phenyl or naphthyl, both of which are unsubstituted or substituted by one or more C1-C6alkyl, halogen, CN, OR11, SR10 and/or NR12R13;
or R9 is benzyloxy or phenoxy both of which are unsubstituted or substituted by one or more C1-C6alkyl and/or halogen;
R10 is hydrogen, C1-C20alkyl, C3-C12alkenyl, C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14,
or R10 is phenyl-C1-C4alkyl or is C1-C20alkyl which is substituted by OH, SH, CN, C3-C6alkenoxy, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S,




 —OCH2CH2(CO)O(C1-C4alkyl),—O(CO)-(C1-C4alkyl), —O(CO)-phenyl, —(CO)OH or —(CO)O(C1-C4alkyl);
or R10 is C2-C20alkyl which is interrupted by one or more O or S;
or R10 is —(CH2CH2O)nH, —(CH2CH2O)n(CO)—(C1-C8alkyl), C2-C8alkanoyl, benzoyl, C3-C12alkenyl or C3-C6alkenoyl;
or R10 is phenyl, naphthyl or C1-C20heteroaryl, each of which is unsubstituted or substituted by one or more halogen, C1-C12alkyl, C1-C12alkoxy, phenyl-C1-C3alkyloxy, phenoxy, C1-C12alkylsulfanyl, phenylsulfanyl, —N(C1-C12alkyl)2, diphenylamino, —(CO)O(C1-C8alkyl) or by (CO)N(C1-C8alkyl)2;
or R10 is phenyl, naphtyl or C1-C20heteroaryl which forms a 5- or 6-membered ring with the phenyl ring to which the SR10 is attached via a direct bond, C1-C4alkylene, O, S, NR14 or CO, wherein said phenyl or naphthyl is unsubstituted or substituted by one or more C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or is substituted by C3-C10cycloalkyl which is optionally interrupted by O, CO or NR14, or is substituted by halogen, C1-C20alkoxy, C1-C20alkylcarbonyl or phenylcarbonyl;
n is an integer from 1-12;
R11 is hydrogen, C1-C20alkyl which optionally is substituted by one or more halogen; or
R11 is —(CH2CH2O)nH, —(CH2CH2O)n(CO)-(C-C8alkyl), C1-C8alkanoyl, C3-C12alkenyl, C3-C12alkenoyl, phenyl-C1-C4alkyl or is C2-C20alkyl which is interrupted by one or more O; or is C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R11 is C1-C20alkyl which is substituted by OH, SH, CN, C3-C6alkenoxy, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, —OCH2CH2CN, —OCH2CH2(CO)O(C1-C4alkyl),





—O(CO)-(C1-C4alkyl), —O(CO)-phenyl, —(CO)OH or —(CO)O(C1-C4alkyl);
or R11 is benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, OH or C1-C4alkoxy;
or R11 is phenyl, naphthyl or C1-C20heteroaryl each of which is unsubstituted or substituted by one or more halogen, OH, C1-C12alkyl, C3-C10cycloalkyl or C1-C12alkoxy;
R12 and R13 independently of one another are hydrogen, C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or are C2-C4hydroxyalkyl, C1-C12alkoxy, phenyl-C1-C4alkyl, (CO)R15, C2-C10alkoxyalkyl, C3-C5alkenyl or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R12 and R13 are phenyl or naphthyl, each of which is unsubstituted or substituted by one or more C1-C20alkoxy, (CO)R15, phenyl, NR16R17, SR10, OR11, C1-C20alkyl, by C2-C20alkyl which is interrupted by O, CO or NR14 or are substituted by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R12 and R13 independently of each other are C2-C5alkylene or C2-C5alkenylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR12R13 is attached, wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O, CO or NR14; or
R12 and R13 independently of one another are phenyl which is attached via a direct bond to the phenyl ring on which the NR12R13 is positioned; or
R12 and R13 together with the N-atom to which they are attached form a 5-or 6-membered saturated or unsaturated ring which optionally is interrupted by O, N or NR14, and which ring is unsubstituted or substituted by one or more C1-C20alkyl, C1-C20alkoxy, ═O, SR10, OR11, NR16R17, (CO)R15, NO2, CN, phenyl or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14; or
R12 and R13 together with the N-atom to which they are attached form a heteroaromatic ring system, which heteroaromatic ring system is unsubstituted or substituted by one or more C1-C20alkyl, C1-C20alkoxy, ═O, SR10, OR11, NR16R17, (CO)R15, NO2, CN, phenyl or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
R14 is hydrogen, C1-C20alkyl, C3-C8cycloalkyl, phenyl or (CO)R15;
R15 is hydrogen, OH, C1-C20alkyl, C1-C4haloalkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or is C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or is phenyl-C1-C4alkyl, SR10, OR11 or NR12R13;
or R15 is phenyl, naphthyl or C1-C20heteroaryl all of which are unsubstituted or substituted by one or more SR10, OR11, NR12R13,




 CN, NO2, halogen, C1-C20alkyl, C1-C10haloalkyl, by C2-C20alkyl which is interrupted by O, CO or NR14 or are substituted by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
R16 and R17 independently of each other are hydrogen, C1-C20alkyl, C3-C10cycloalkyl or phenyl; or
R16 and R17 together with N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring, which optionally is interrupted by O, S or NR14;
or R16 and R17 independently of one another are C2-C5alkylene or C2-C5alkenylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR16R17 is attached, wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O, CO or NR15, and to which C2-C5alkylene or C2-C5alkenylene optionally a benzene ring is condensed;
R18, R19, R20, R′18, R′19, and R′20 independently of one another are hydrogen, halogen,




 C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or are C2-C12alkenyl which optionally is interrupted by O, CO or NR14, or are C4-C8cycloalkenyl, C2-C12alkinyl, phenyl-C1-C4alkyl, CN, NO2 or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R18, R19, R20, R′18, R′19, and R′20 are phenyl which is unsubstituted or substituted by one or more C1-C20alkyl, halogen, CN, SR10, OR11 or NR12R13;
or R18, R19, R20, R′18, R′19, and R′20 are (CO)R′2, SR10, OR11, SOR10, SO2R10 or NR12R13, wherein the substituents (CO)R′2, OR11, SR10 and NR12R13 optionally form 5- or 6-membered rings via the radicals R10, R11, R12 R13, and/or R′2 with further substituents on the phenyl ring or with one of the carbon atoms of the phenyl ring;
R′′18 and R′′19 independently of each other have one of the meanings as given for R′′6 and
R′′7; and
R′′′18 and R′′′19 independently of each another have one of the meanings as given for R′′′6 and R′′′7;
R21 is COOR11, CONR12R13 or (CO)R9; or R21 has one of the meanings as given for R15;
R22 is COOR11, CONR12R13 or (CO)R9; or R22 has one of the meanings as given for R12 and R13;
X is O, S, SO or SO2;
X2 is a direct bond, C1-C20alkylene which optionally is interrupted by O, CO or NR14, and which uninterrupted or interrupted C1-C20alkylene is unsubstituted or substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13, 




 phenyl or by phenyl which is substituted by halogen, C1-C20alkyl, C1-C4haloalkyl, SR10, OR11, or NR12R13, and which unsubstituted or substituted, interrupted or non-interrupted C1-C20alkylene optionally contains one or more C—C multiple bonds;
m is an integer 1 or 2;
R23 has one of the meanings as given for R9;
R24 is hydrogen, C1-C20alkyl; C2-C20alkenyl; C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or R24 is C3-C10cycloalkenyl; C1-C20alkyl which is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,




 or by phenyl;
or R24 is C2-C20alkyl which is interrupted by one or more O and/or optionally is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,




 or by phenyl;
or R24 is phenyl, naphthyl or C1-C20heteroaryl, all of which optionally are substituted by one or more C1-C12alkyl, phenyl, halogen, C1-C4haloalkyl, CN, NO2, SR10, OR11, NR12R13 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R24 is C2-C20alkanoyl, or benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, phenyl, SR10, OR11 or NR12R13;
or R24 is C2-C12alkoxycarbonyl which optionally is interrupted by one or more O and/or optionally is substituted by one or more OH;
or R24 is phenoxycarbonyl which is unsubstituted or substituted by one or more C1-C6alkyl, C1-C4haloalkyl, halogen, phenyl, SR10, OR11 or NR12R13;
or R24 is NR12R13;
or R24 forms a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group




 is attached, wherein said formed ring is unsubstituted or substituted; or
R24 is




provided that
R2 in formula III and R′′2 in formula II
(i) are NR12R13 or






(ii) form a ring with one of the C-atoms of the phenyl or naphthyl ring to which the corresponding group






 ,(CO)R′2 or (CO)R′′′2 is attached;
(iii) are C1-C20alkyl which is substituted by one or more C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S or






 ; or
(iv) are unsubstituted or substituted C1-C20heteroaryl.

2. A compound of the formula II or III according to claim 1, wherein
R1 is, C1-C20alkyl;
R6, R7, R8, R′6, R′7, R′8, R′′6, R′′7, R′′′6 and R′′′7 independently of one another are hydrogen, (CO)R′2, or NR12R13;
R9 is C1-C20alkyl;
R10 is Cl-C20heteroaryl;
R11 is C1-C20alkyl;
R12 and R13 together with the N-atom to which they are attached form a heteroaromatic ring system;
R18, R19, R20, R′18, R′19, and R′20 are hydrogen,
or R18, R19, R20, R′18, R′19, and R′20 are phenyl which is unsubstituted or substituted by one or more C1-C20alkyl;
R21 is (CO)R9;
R22 is, (CO)R9;
X is O;
X2 is a direct bond;
m is an integer 1;
R23 has one of the meanings as given for R9; and
R24 is C1-C20alkyl.

3. A photopolymerizable composition comprising
(a) at least one ethylenically unsaturated photopolymerizable compound and
(b) as photoinitiator, at least one compound of the formula II or III according to claim 1.

4. A photopolymerizable composition according to claim 3 comprising in addition to the photoinitiator (b) at least one further photoinitiator (c) and/or other additives (d).

5. A photopolymerizable composition according to claim 4 comprising as further additive (d) a photosensitizer.

6. A photopolymerizable composition according to claim 5 wherein the photosensitizer is selected from the group consisting of benzophenones, thioxanthones, anthraquinones and coumarins.

7. A photopolymerizable composition according to claim 4, comprising 0.005 to 25% by weight of the photoinitiator (b), or the photoinitiators (b) and (c), based on the composition.

8. A photopolymerizable composition according to claim 3, wherein the component (a) is a resin obtained by the reaction of a saturated or unsaturated polybasic acid anhydride with a product of the reaction of an epoxy resin and an unsaturated monocarboxylic acid.

9. A photopolymerizable composition according to claim 3 additionally comprising a binder polymer (e).

10. A photopolymerizable composition according to claim 9 wherein the binder polymer is a copolymer of methacrylate and methacrylic acid.

11. A photopolymerizable composition according to claim 3 comprising as further additive (d) a pigment or a mixture of pigments.

12. A photopolymerizable composition according to claim 11 comprising as further additive (d) a dispersant or a mixture of dispersants.

13. A process for the photopolymerization of compounds containing ethylenically unsaturated double bonds, which comprises irradiating a composition according to claim 3 with electromagnetic radiation in the range from 150 to 600 nm, or with electron beam or with X-rays.

14. Coated substrate which is coated on at least one surface with a composition according to claim 3.

15. Process for the photographic production of relief images, in which a coated substrate according to claim 14 is subjected to imagewise exposure and then the unexposed portions are removed with a developer.

16. A color filter prepared by providing red, green and blue picture elements and a black matrix, all comprising a photosensitive resin according to claim 3 and a pigment on a transparent substrate and providing a transparent electrode either on the surface of the substrate or on the surface of the color filter layer, wherein said photosensitive resin comprises a polyfunctional acrylate monomer, an organic polymer binder and a photopolymerization initiator of formula II or III.

17. A process for the preparation of a compound of the formula II or III as defined in claim 1 by reacting an oxime compound of formula IIa or IIIa



wherein R2, R′′2, R′′′2, R6, R′6, R′′6, R′′′6, R7, R′7, R′′7, R′′′7, R8 and R′8 are as defined in claim 1,
with an acyl halide or an anhydride of formula V or VI




wherein Hal denotes a halogen atom and R9 is as defined in claim 1, in the presence of a base or a mixture of bases.

18. A compound of formula IIa or IIIa



R2 is hydrogen, C1-C20alkyl which C1-C20alkyl optionally contains one or more C—C multiple bonds;
C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14 and which uninterrupted or interrupted C3-C10cycloalkyl optionally contains one or more C—C multiple bonds;
or R2 is C1-C20alkyl which is substituted by one or more halogen, OR11, COOR11 , NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,





phenyl or by phenyl which is substituted by SR10, OR11 or NR12R13, which substituted C1-C20alkyl optionally contains one or more C—C multiple bonds;
or R2 is C2-C20alkyl which is interrupted by one or more O and/or optionally is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,




 ,phenyl or by which is substituted by SR10, OR11, or NR12R13, which interrupted C2-C20alkyl optionally contains C—C multiple bonds;
or R2 is unsubstituted phenyl, naphthyl or C1-C20heteroaryl; or are phenyl, naphthyl or C1-C20heteroaryl which is substituted by one or more C1-C12alkyl, C2-C12alkenyl, C2-C12alkynyl, phenyl, halogen, CN, NO2, SR10, OR11, NR12R13 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R2 is C2-C20alkanoyl, or benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, phenyl, SR10, OR11 or NR12R13;
or R2 is C2-C12alkoxycarbonyl which optionally is interrupted by one or more O and/or optionally is substituted by one or more OH;
or R2 is phenoxycarbonyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, phenyl, SR10, OR11 or NR12R13;
or R2 is are NR12R13 or




or R2 is form a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group




 is attached, wherein said formed ring is unsubstituted or substituted;
R′′2 has one of the meanings given for R2 or is




R′′′2 has one of the meanings given for R2 or is




R1 is hydrogen, (CO)R′′2, C1-C20alkoxycarbonyl, phenyl-C1-C4alkyl, C1-C20alkyl which optionally is substituted by one or more halogen, COOR11 or CONR12R13;
or R1 is C2-C20alkyl which is interrupted by O, CO or NR14; or is C2-C12alkenyl which optionally is interrupted by O, CO or NR14, or is C4-C8cycloalkenyl or C2-C12alkinyl;
or R1 is benzoyl, naphthoyl, phenyloxycarbonyl or naphtyloxycarbonyl; or is benzoyl, naphthoyl, phenyloxycarbonyl or naphtyloxycarbonyl each of which is substituted by one or more C1-C20alkyl, C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R1 is C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or is C3-C10cycloalkylcarbonyl which optionally is interrupted by O, CO or NR14, or is C3-C10cycloalkyloxycarbonyl which optionally is interrupted by O, CO or NR14;
or R1 is unsubstituted phenyl or naphthyl, or is phenyl or naphthyl which is substituted by one or more C1-C20alkyl, C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2, or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
R6, R7, R8, R′6, R′7, R′8, R′′6, R′′7, R′′′6 and R′′′7 independently of one another are hydrogen, halogen,




 C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or are C2-C12alkenyl which optionally is interrupted by O, CO or NR14, or are C4-C8cycloalkenyl, C2-C12alkinyl, phenyl-C1-C4alkyl, CN, NO2 or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R6, R7, R8, R′6, R′7, R′8, R′′6, R′′7, R′′′6 and R′′′7 are phenyl which is unsubstituted or substituted by one or more C1-C20alkyl, halogen, CN, SR10, OR11 or NR12R13;
or R6, R7, R8, R′6, R′7, R′8, R′′6, R′′7, R′′′6 and R′′′7 are (CO)R′2, SR10, OR11, SOR10, SO2R10 or NR12R13, wherein the substituents (CO)R′2, OR11, SR10 and NR12R13 optionally form 5- or 6-membered rings via the radicals R10, R11, R12 R13, and/or R′2 with further substituents on the phenyl ring or with one of the carbon atoms of the phenyl ring;
or R′′6 and R′′7 in formula IIa together are C1-C6alkylene or C2-C6alkenylene to form a bicyclic ring together with the phenyl to which they are attached, wherein said bicyclic ring optionally is substituted by one or more C1-C20alkyl, or by C2-C20alkyl which is interrupted by O, CO or NR14, or said bicyclic ring optionally is substituted by C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2, or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14; provided that the group




 is attached to either ring;
or R′′′6 and R′′′7 in formula IIIa together are C2-C6alkylene or C2-C6alkenylene to form a bicyclic ring together with the phenyl to which they are attached, wherein said bicyclic ring optionally is substituted by one or more C1-C20alkyl, by C2-C20alkyl which is interrupted by O, CO or NR14, or said bicyclic ring optionally is substituted by C1-C4haloalkyl, SR10, OR11, NR12R13, halogen, phenyl, COOR11, CONR12R13, CN, NO2, or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
provided that one or more groups (CO)R′′′2 are attached to either ring;
R′2 is hydrogen, C1-C20alkyl which C1-C20alkyl optionally contains one or more C—C multiple bonds;
C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14 and which uninterrupted or interrupted C3-C10cycloalkyl optionally contains one or more C—C multiple bonds;
or R2 and R′2 are C1-C20alkyl which is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,




 , phenyl or by phenyl which is substituted by SR10, OR11 or NR12 R13, which substituted C1-C20alkyl optionally contains one or more C—C multiple bonds;
or R2 and R′2 are C2-C20alkyl which is interrupted by one or more O and/or optionally is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,




 , phenyl or by phenyl which is substituted by SR10, OR11, or NR12R13, which interrupted C2-C20alkyl optionally contains C—C multiple bonds;
or R2 and R′2 are unsubstituted phenyl, naphthyl or C1-C20heteroaryl; or are phenyl, naphthyl or C1-C20heteroaryl which is substituted by one or more C1-C12alkyl, C2-C12alkenyl, C2-C12alkynyl, phenyl, halogen, CN, NO2, SR10, OR11, NR12R13 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R2 and R′2 are C2-C20alkanoyl, or benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, phenyl, SR10, OR11 or NR12R13;
or R2 and R′2 are C2-C12alkoxycarbonyl which optionally is interrupted by one or more O and/or optionally is substituted by one or more OH;
or R2 and R′2 are phenoxycarbonyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, phenyl, SR10, OR11 or NR12R13;
or R2 and R′2 are NR12R13 or




or R2 and R′2 form a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group (CO)R′2 is attached, wherein said formed ring is unsubstituted or substituted;
R9 is hydrogen, C3-C8cycloalkyl, C2-C5alkenyl, C1-C20alkoxy, unsubstituted C1-C20alkyl or C1-C20alkyl which is substituted by one or more halogen, phenyl, C1-C20alkylphenyl and/or CN;
or R9 is phenyl or naphthyl, both of which are unsubstituted or substituted by one or more C1-C6alkyl, halogen, CN, OR11, SR10, and/or NR12R13;
or R9 is benzyloxy or phenoxy both of which are unsubstituted or substituted by one or more C1-C6alkyl and/or halogen;
R10 is hydrogen, C1-C20alkyl, C3-C12alkenyl, C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14,
or R10 is phenyl-C1-C4alkyl or is C1-C20alkyl which is substituted by OH, SH, CN, C3-C6alkenoxy, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S,




 —OCH2CH2(CO)O(C1-C4alkyl), —O(CO)-(C1-C4alkyl), —O(CO)-phenyl, —(CO)OH or —(CO)O(C1-C4alkyl);
or R10 is C2-C20alkyl which is interrupted by one or more O or S;
or R10 is —(CH2CH2O)nH, —(CH2CH2O)n(CO)—(C1-C8alkyl), C2-C8alkanoyl, benzoyl, C3-C12alkenyl or C3-C6alkenoyl;
or R10 is phenyl, naphthyl or C1-C20heteroaryl, each of which is unsubstituted or substituted by one or more halogen, C1-C12alkyl, C1-C12alkoxy, phenyl-C1-C3alkyloxy, phenoxy, C1-C12alkylsulfanyl, phenylsulfanyl, —N(C1-C12alkyl)2, diphenylamino, —(CO)O(C1-C8alkyl) or by (CO)N(C1-C8alkyl)2;
or R10 is phenyl, naphtyl or C1-C20heteroaryl which forms a 5- or 6-membered ring with the phenyl ring to which the SR10 is attached via a direct bond, C1-C4alkylene, O, S, NR14 or CO, wherein said phenyl or naphthyl is unsubstituted or substituted by one or more C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or is substituted by C3-C10cycloalkyl which is optionally interrupted by O, CO or NR14, or is substituted by halogen, C1-C20alkoxy, C1-C20alkylcarbonyl or phenylcarbonyl;
n is an integer from 1-12;
R11 is hydrogen, C1-C20alkyl which optionally is substituted by one or more halogen; or
R11 is —(CH2CH2O)nH, —(CH2CH2O)n(CO)-(C1-C8alkyl), C1-C8alkanoyl, C3-C12alkenyl, C3-C6alkenoyl, phenyl-C1-C4alkyl or is C2-C20alkyl which is interrupted by one or more O; or is C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R11 is C1-C20alkyl which is substituted by OH, SH, CN, C3-C6alkenoxy, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, —OCH2CH2CN, —OCH2CH2(CO)O(C1-C4alkyl),





—O(CO)—(C1-C4alkyl), —O(CO)-phenyl, —(CO)OH or —(CO)O(C1-C4alkyl);
or R11 is benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, OH or C1-C4alkoxy;
or R11 is phenyl, naphthyl or C1-C20heteroaryl each of which is unsubstituted or substituted by one or more halogen, OH, C1-C12alkyl, C3-C10cycloalkyl or C1-C12alkoxy;
R12 and R13 independently of one another are hydrogen, C1-C20alkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or are C2-C4hydroxyalkyl, C1-C12alkoxy, phenyl-C1-C4alkyl, (CO)R15, C2-C10alkoxyalkyl, C3-C5alkenyl or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R12 and R13 are phenyl or naphthyl, each of which is unsubstituted or substituted by one or more C1-C20alkoxy, (CO)R15, phenyl, NR16R17, SR10, OR11, C1-C20alkyl, by C2-C20alkyl which is interrupted by O, CO or NR14 or are substituted by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R12 and R13 independently of each other are C2-C5alkylene or C2-C5alkenylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR12R13 is attached, wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O, CO or NR14; or
R12 and R13 independently of one another are phenyl which is attached via a direct bond to the phenyl ring on which the NR12R13 is positioned; or
R12 and R13 together with the N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring which optionally is interrupted by O, N or NR14, and which ring is unsubstituted or substituted by one or more C1-C20alkyl, C1-C20alkoxy, ═O, SR10, OR11, NR16R17, (CO)R15, NO2, CN, phenyl or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14; or
R12 and R13 together with the N-atom to which they are attached form a heteroaromatic ring system, which heteroaromatic ring system is unsubstituted or substituted by one or more C1-C20alkyl, C1-C20alkoxy, ═O, SR10, OR11, NR16R17, (CO)R15, NO2, CN, phenyl or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
R14 is hydrogen, C1-C20alkyl, C3-C8cycloalkyl, phenyl or (CO)R15;
R15 is hydrogen, OH, C1-C20alkyl, C1-C4haloalkyl, C2-C20alkyl which is interrupted by O, CO or NR14, or is C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or is phenyl-C1-C4alkyl, SR10, OR11 or NR12R13;
or R15, naphthyl or C1-C20heteroaryl all of which are unsubstituted or substituted by one or more SR10, OR11, NR12R13,




 CN, NO2, halogen, C1-C20alkyl, C1-C4haloalkyl, by C2-C20alkyl which is interrupted by O, CO or NR14 or are substituted by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
R16 and R17 independently of each other are hydrogen, C1-C20alkyl, C3-C10cycloalkyl or phenyl; or
R16 and R17 together with N-atom to which they are attached form a 5- or 6-membered saturated or unsaturated ring, which optionally is interrupted by O, S or NR14;
or R16 and R17 independently of one another are C2-C5alkylene or C2-C5alkenylene which is attached to one of the C-atoms of the phenyl or naphthyl ring to which the NR16R17 is attached, wherein said C2-C5alkylene or C2-C5alkenylene optionally is interrupted by O, CO or NR15, and to which C2-C5alkylene or C2-C5alkenylene optionally a benzene ring is condensed;
R18, R19, R20, R′18, R′19, and R′20 independently of one another are hydrogen, halogen,




 C1-C20alkyl, which is interrupted by O, CO or NR14, or are C2-C12alkenyl which optionally is interrupted by O, CO or NR14, or are C4-C8cycloalkenyl, C2-C12alkinyl, phenyl-C1-C4alkyl, CN, NO2 or C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R18, R19, R20, R′18, R′19, and R′20 are phenyl which is unsubstituted or substituted by one or more C1-C20alkyl, halogen, CN, SR10, OR11 or NR12R13;
or R18, R19, R20, R′18, R′19, and R′20 are (CO)R′2, SR10, OR11, SOR10, SO2R10 or NR12R13, wherein the substituents (CO)R′2, OR11, SR10, and NR12R13 optionally form 5- or 6-membered rings via the radicals R10, R11, R12 R13, and/or R′2 with further substituents on the phenyl ring or with one of the carbon atoms of the phenyl ring;
R′′18 and R′′19 independently of each other have one of the meanings as given for R′′6 and R′′7; and
R′′′18 and R′′′19 independently of each another have one of the meanings as given for R′′′6 and R′′′7;
R21 is COOR11, CONR12R13 or (CO)R9; or R21 has one of the meanings as given for R15;
R22 is COOR11, CONR12R13 or (CO)R9; or R22 has one of the meanings as given for R12 and R13;
X is O, S, SO or SO2;
X2 is a direct bond, C1-C20alkylene which optionally is interrupted by O, CO or NR14, and which uninterrupted or interrupted C1-C20alkylene is unsubstituted or substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,




 phenyl or by phenyl which is substituted by halogen, C1-C20alkyl, C1-C4haloalkyl, SR10, OR11, or NR12R13, and which unsubstituted or substituted, interrupted or non-interrupted C1-C20alkylene optionally contains one or more C—C multiple bonds;
m is an integer 1 or 2;
R23 has one of the meanings as given for R9;
R24 is hydrogen, C1-C20alkyl; C2-C20alkenyl; C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14, or R24 is C3-C10cycloalkenyl; C1-C20alkyl which is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13,




 or by phenyl;
or R24 is C2-C20alkyl which is interrupted by one or more O and/or optionally is substituted by one or more halogen, OR11, COOR11, NR12R13, C1-C20heteroaryl, C1-C0heteroaryl-(CO)O, C1-C20heteroaryl-S, CONR12R13, 




 or by phenyl;
or R24 is phenyl, naphthyl or C1-C20heteroaryl, all of which optionally are substituted by one or more C1-C12alkyl, phenyl, halogen, C1-C4haloalkyl, CN, NO2, SR10, OR11, NR12R13 or by C3-C10cycloalkyl which optionally is interrupted by O, CO or NR14;
or R24 is C2-C20alkanoyl, or benzoyl which is unsubstituted or substituted by one or more C1-C6alkyl, halogen, phenyl, SR10, OR11 or NR12R13;
or R24 is C2-C12alkoxycarbonyl which optionally is interrupted by one or more O and/or optionally is substituted by one or more OH;
or R24 is phenoxycarbonyl which is unsubstituted or substituted by one or more C1-C6alkyl, C1-C4haloalkyl, halogen, phenyl, SR10, OR11 or NR12R13;
or R24 is NR12R13;
or R24 forms a ring with one of the C-atoms of the phenyl or naphthyl ring to which the group




 is attached, wherein said formed ring is unsubstituted or substituted; or
R24 is




provided that
R2 in formula IIIa and R′′2 in formula IIa
(i) are NR12R13 or






(ii) form a ring with one of the C-atoms of the phenyl or naphthyl ring to which the corresponding group






 (CO)R′2 or (CO)R′′′2 is attached;
(iii) are C1-C20alkyl which is substituted by one or more C1-C20heteroaryl, C1-C20heteroaryl-(CO)O, C1-C20heteroaryl-S or






 or
(iv) are unsubstituted or substituted C1-C20heteroaryl.