Patent ID: 6558768
Filing Date: 2003-05-06
Classification: G11B,Y10T

Abstract:
An optical recording medium comprising a substrate and a recording layer formed thereon, said recording layer comprising at least one squarylium compound and one azo metal chelate compound comprising an azo moiety of formula (I-1) and a metal: wherein A and B are each independently a residue for forming an aromatic ring which may have a substituent or a heterocyclic ring which may have a substituent in combination with one or two carbon atoms bonded thereto; and X represents a substituent having an active hydrogen group, andwherein said squarylium compound is selected from the group consisting of: a compound represented by formula (II): wherein R1 and R2, which may be the same or different, are each a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group, or R1 and R2 may form a heterocyclic ring which may have a substituent in combination with a nitrogen atom bonded thereto; and R3 is represented by formula (III) dr (IV) wherein R4 and R5, which may be the same or different, are each a hydrogen atom or an alkyl group, or R4 and R5 may form a heterocyclic ring which may have a substituent in combination with a nitrogen atom bonded thereto; and R6, R7, R8, and R9, which may be the same or different, are each a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxyl group, hydroxyl group, or a halogen atom, and R4 and R6, and R5 and R7 may independently form a heterocyclic ring, which may have a substituent, in combination with a nitrogen atom and two carbon atoms bonded thereto; wherein Q1 is a carbon atom or a nitrogen atom; R10 and R11, which may be the same or different, are each a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, or hydroxyl group, provided that R11 does not exist when Q1 is a nitrogen atom; R12 is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group; R13 and R14, which may be the same or different, are each a hydrogen atom, a substituted or unsubstituted alkyl group, an alkoxyl group, or a halogen atom, or R13 and R14 may form an alicyclic hydrocarbon ring, an aromatic ring which may have a substituent, or a heterocyclic ring which may have a substituent, in combination with two carbon atoms bonded thereto; anda compound represented by formula (V) wherein Q2 is a carbon atom or a nitrogen atom; R15 is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group; R16 is a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted amino group, or a substituted or unsubstituted heterocyclic group; R17 and R18, which may be the same or different, are each a substituted or unsubstituted alkyl group, or when Q2 is a carbon atom, R17 and R18 may form an alicyclic hydrocarbon ring or a heterocyclic ring in combination with said carbon atom bonded thereto, whereas when Q2 is a nitrogen atom, R18 does not exist; R19 is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; R20 is a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, trifluoromethyl group, nitro group, cyano group, or a substituted or unsubstituted alkoxyl group; and n is an integer of 0 to 4, provided that when n is an integer of 2 to 4, a plurality of groups represented by R20 may be the same or different, and in this case, adjacent groups of R20 may form an aromatic ring which may have a substituent in combination with two carbon atoms bonded thereto.