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Patent US4853362 - Heat-sensitive recording sheet - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA heat-sensitive recording material has a support and a color-developing layer which comprises both as a colorless basic chromogenic dye at least one of a particular fluorane-type leuco dye and a particular divinyl compound and as a stabilizer a particular halogen-substituted zinc benzoate derivative....http://www.google.com/patents/US4853362?utm_source=gb-gplus-sharePatent US4853362 - Heat-sensitive recording sheetAdvanced Patent SearchPublication numberUS4853362 APublication typeGrantApplication numberUS 07/234,463Publication dateAug 1, 1989Filing dateAug 19, 1988Priority dateSep 14, 1987Fee statusLapsedAlso published asCA1296896C, DE3880599D1, EP0307836A2, EP0307836A3, EP0307836B1Publication number07234463, 234463, US 4853362 A, US 4853362A, US-A-4853362, US4853362 A, US4853362AInventorsToshimi Satake, Tadakazu Fukuchi, Toshiaki Minami, Tomoaki Nagai, Toshio Kaneko, Fumio FujimuraOriginal AssigneeJujo Paper Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (2), Referenced by (17), Classifications (18), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetHeat-sensitive recording sheet
US 4853362 AAbstract
A heat-sensitive recording material has a support and a color-developing layer which comprises both as a colorless basic chromogenic dye at least one of a particular fluorane-type leuco dye and a particular divinyl compound and as a stabilizer a particular halogen-substituted zinc benzoate derivative.
This heat-sensitive recording material is superior in light resistance, weather resistance, oil resistance and optical readability in the near infrared region.
1. A heat-sensitive recording material comprising a support having thereon a color-developing layer which contains as main ingredient a colorless or pale colored basic chromogenic dye and an organic colordeveloping agent, wherein the color-developing layer comprises as the colorless or pale colored basic chromogenic dye at least one substance selected from the group consisting of a fluorane-type leuco dye represented by the following general formula (I) and a divinyl compound represented by the following general formula (II), and as a stabilizer at least one halogen-substituted zinc benzoate derivative represented by the following general formula (III): ##STR17## wherein at least one of R1, R2, R3, R4, R5, R6, R7, R8 and R9 represents ##STR18## the remainders of R1, R2, R3, R4, R5, R6, R7, R8 and R9, which may be the same or different, represent a hydrogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, a halogen atom, a nitro group, a hydroxy group, an amino group, a substituted amino group, an aralkyl group, a substituted aralkyl group, an aryl group or a substituted aryl group;T1, T2 and T3, which may be the same or different, represent a hydrogen atom, a C3 -C9 alkyl group, a C3 -C9 alkenyl group, or a C3 -C9 alkinyl group; T4 represents a hydrogen atom, a C1 -C8 alkyl group, a C3 -C9 alkenyl group, a C3 -C9 alkinyl group or a phenyl group; in addition, T3 and T4 taken together with the nitrogen to which they are attached, may represent, a morpholino group, a pyrrolidino group, a piperidino group or a hexamethyleneimino group; and n represents an integer from 0 to 4; ##STR19## wherein R11 represents an alkyl group of not more than 6 carbon atoms; R12 represents an alkyl group of not more than 8 carbon atoms, a C5 -C7 cycloalkyl group, a benzyl group which may be substituted with a chlorine atom, a bromine atom and/or an alkyl group of not more than 4 carbon atoms, or a phenyl group which may be substituted with a chlorine atom, a bromine atom and/or an alkyl group of not more than 4 carbon atoms; X1 and X2, which may be the same or different, represent an alkyl group of not more than 8 carbon atoms, an alkoxy group of not more than 8 carbon atoms, a fluorine atom, a chlorine atom or a bromine atom; m and n each represents 0, 1, 2 or 3; each X1 of (X1)n, each X2 of (X2)n or each X3 of (X3)n can be the same or different; and X3 represents a chlorine atom or a bromine atom, in which at least one of X3 in (X3)4 represents a bromine atom; ##STR20## wherein X represents a halogen atom; A represents a halogen atom, a nitro group, a C1 -C12 alkyl group, a C1 -C12 alkoxy group, a C3 -C10 cycloalkyl group, a cyano group or a hydroxy group; l represents 1 or 2; and m represents an integer from 0 to 5. 2. The heat-sensitive recording material according to claim 1, wherein the fluorane-type leuco dye represented by the general formula (I) is at least one dye selected from the group consisting of 2-chloro-3-methyl-6-p-(p-phenylaminophenyl)aminoanilinofluorane and 2-methyl-6-p-(p-dimethylaminophenyl)aminoanilinofluorane.
3. The heat-sensitive recording material according to claim 1, wherein the divinyl compound represented by the general formula (II) is 3,3-bis-4,5,6,7-tetrabromophthalide.
4. The heat-sensitive recording material according to claim 1, wherein the color-developing layer further comprises at least one sulfonyl methane derivative selected from the group consisting of bis(p-dimethylaminostyryl)-p-methylphenylsulfonylmethane, bis(p-diethylaminostyryl)-p-methylphenylmethane and bis(p-dimethylaminostyryl)-benzenesulfonylmethane.
5. The heat-sensitive recording material according to claim 1, wherein the color-developing layer further comprises at least one fluorene leuco dye selected from the group consisting of 3,6-bis(dimethylamino)fluorene-9-spiro-3'-(6'-dimethylamino)phthalide, and 3,6-bis(diethylamino)fluorene-9-spiro-3'-(6'-diethylamino)phthalide.
6. The heat-sensitive recording material according to claim 1, wherein the organic color-developing agent is at least one substance selected from the group consisting of bisphenols A, 4-hydroxybenzoic acid esters, 4-hydroxyphthalic acid diesters, phthalic acid monoesters, bis-(hydroxyphenyl)sulfides, 4-hydroxyphenl arylsulfonate, 4-hydroxyphenyl arylsulfonates, 1,3-dibenzenes, 4-hydroxybenzoyl oxybenzoic acid esters and bisphenol sulfonates.
7. The heat-sensitive recording material according to claim 1, wherein the color-developing layer comprises 1-8 parts by weight of the organic color-developing agent, 0.1-5 parts by weight of the stabilizer and 1-20 parts by weight of filler, based on 1 part by weight of the colorless basic chromogenic dye, and 10-25 parts by weight of binder in total solid content.
8. The heat-sensitive recording material according to claim 1, wherein the support is a film.
In general, a heat-sensitive recording sheet is produced by applying on a support, such as paper, synthetic paper, film, plastic et., a coating which is prepared by individually grinding and dispersing a colorless chromogenic dyestuff and an organic color-developing agent, such as phenolic material, etc., into fine particles, mixing the resultant dispersion with each other and then adding thereto binder, filler, sensitizer, slipping agent and other auxiliaries. The coating, when heated by thermal pen, thermal head, hot stamp, laser beam, etc., undergoes instantaneously a chemical reaction which forms a color. These heat-sensitive recording sheets have now been finding a wide range of applications, including industrial measurement recording instruments, terminal printers of computer, facsimile equipments, automatic ticket vending machines, printer for bar-code-label, and so on. In recent years, as the application of such recording equipment is enhanced, high qualities are required for heat-sensitive recording sheets. For example, even with small heat energy in a high speed recoding, both the clear image with a high density and the better preservability such as better resistance to light, weather and oil, etc. are required. These heat-sensitive recording sheets are also utilized as thermosensitive labels. Since, however, color formation in these recording sheets is in the visible region, they cannot be adapted for reading by a semiconductor laser in the near infrared region which is widely used as a bar code scanner in a POS system, etc.
The above-mentioned objects can be performed as follows. The heat-sensitive recording material comprises a support having thereon a color-developing layer which comprises as a colorless or pale colored basic chromogenic dye at least one substance selected from the group consisting of a fluorane-type leuco dye represented by the following general formula (I) and a divinyl compound represented by the following general formula (II), and as a stabilizer at least one halogen-substituted zinc benzoate derivatives represented by the following general formula (III): ##STR1## wherein at least one of R1, R2, R3, R4, R5, R6, R7, R8 and R9 represents ##STR2## the remainders of R1, R2, R3, R4, R5, R6, R7, R8 and R9, which may be the same or different, represent a hydrogen atom, an alkyl group, an alkoxy group, a cycloalkyl group, a halogen atom, a nitro group, a hydroxy group, an amino group, a substituted amino group, an aralkyl group, a substituted aralkyl group, an aryl group or a substituted aryl group;
T1, T2 and T3, which may be the same or different, represent a hydrogen atom, a C3 -C9 alkyl group, a C3 -C9 alkenyl group, or a C3 -C9 alkinyl group;
T4 represents a hydrogen atom, a C1 -C8 alkyl group, a C3 -C9 alkenyl group, a C3 -C9 alkinyl group or a phenyl group; in addition,
T3 and T4 taken together with a nitrogen to which they are attached, may represent, a morpholino group, a pyrrolidino group, a piperidino group or a hexamethyleneimino group; and n represent an integer from 0 to 4; ##STR3## wherein
R11 represents an alkyl group of not more than 8 carbon atoms;
R12 represents an alkyl group of not more than 8 carbon atoms, a C5 -C7 cycloalkyl group, a benzyl group which may be substituted with a chlorine atom, a bromine atom and/or an alkyl group of not more than 4 carbon atoms, or a phenyl group which may be substituted with a chlorine atom, a bromine atom and/or an alkyl group of not more than 4 carbon atoms;
X1 and X2, which may be the same or different, represent an alkyl group of not more than 8 carbon atoms, an alkoxy group of not more than 8 carbon atoms, a fluorine atoms, a chlorine atom or a bromine atom; m and n each represents 0, 1, 2 or 3;
each X1 of (X1)n,
each X2 of (X2)n or
each X3 of (X3)n can be the same or different; and
X3 represents a chlorine atom or a bromine atom, in which at least one of X3 in (X3)4 represents a bromine atom; ##STR4## wherein X represents a halogen atom;
A represents a halogen atom, a nitro group, a C1 -C12 alkyl group, a C1 -C12 alkoxy group, a C3 -C10 cycloalkyl group, a cyano group or a hydroxy group; l represents 1 or 2; and m represents an integer from 0 to 5.
Among the fluorantype leuco dyes of the general formula (I), the dyes of the following general formula (IV) is preferable. ##STR5## wherein R1, R2, R3, R4, R5, R7, R8, T1, T2, T3, T4 and n are as defined above.
Taking the productivity, costs and performances into consideration, 2-methyl-6-p-(p-dimethylaminophenyl)aminoanilinofluoran (m.p 197�-230� C.) of the following formula (V) and 2-chloro-3-methyl-6-p-(p-phenylaminophenyl)aminoanilinofluoran (m.p: 191.5�-196� C.) of the following formula (VI) are most preferable. ##STR6## The fluoran type leuco dyes of this invention are not particularly limited and include, for example, 2-methyl-6-p-(p-dimethylaminophenyl)aminoanilinofluoran, 2-methoxy-6-p-(p-dimethylaminophenyl)aminoanilinofluoran, 2-chloro-6-p-(p-dimethylaminophenyl)aminoanilinofluoran, p-nitro-6-p-(p-diethylaminophenyl)aminoanilinofluoran, 2-amino-6-p-(p-diethylaminophenyl)aminoanilinofluoran, 2-diethylamino-6-p-(p-diethylaminophenyl)aminoanilinofluoran, 2-phenyl-6-(p-phenylaminophenyl)aminoanilinofluoran, 2-benzyl-6-p-(p-penylaminophenyl)aminoanilinofluoran, 2-hydroxy-6-p-(p-phenylaminophenyl) aminoanilinofluoran, 3-methyl-6-p-(p-dimethylaminophenyl)aminoanilinofluoran, 3-diethylamino-6-p-(p-diethylaminophenyl)aminoanilinofluoran, 3-diethylamino-6-p-(p-dibuthylaminophenyl)aminoanilinofluoran, 3-methyl-7-p-()p-dimethylaminophenyl)aminoanilinofluoran, 3-methoxy-7-p-(p-dimethylaminophenyl)aminoanilinofluoran, 3-chloro-7-p-(p-dimethylaminophenyl) aminoanilinofluoran, 3-nitro-7-p-(p-diethylaminophenyl) aminoanilinofluoran, 3-amino-7-p-(p-diethylaminophenyl) aminoanilinofluoran, 3-diethylamino-7-p-(p-diethylaminophenyl)aminoanilinofluoran, 3-phenyl-7-p(p-phenylaminophenyl)aminoanilinofluoran, 3-benzyl-7-p-(p-phenylaminophenyl)aminoanilinofluoran, 3-hydroxy-7-p-(p-phenylaminophenyl)aminoanilinofluoran, 2-methyl-7-p-(p-dimethylaminophenyl)aminoanilinofluoran, 2-diethylamino7-p-(p-diethylamino)-7-p(p-diethylaminophenyl)aminoanilinofluoran, 2-diethylamino-7-p-(p-dibutylaminophenyl)aminoanilinofluoran, 2-p-(p-dimethylaminophenyl) aminoanilino-6-methylfluoran, 2-p-(p-dimethylaminophenyl)aminoanilino-6-methoxyfluoran, 2-p-(p-dimethylaminophenyl)aminoanilino-6-chlorofluoran, 2-p-(p-diethylaminophenyl)aminoanilino-6-nitrofluoran, 2-p-(p-diethylaminophenyl)aminoanilino-6-aminofluoran, 2-p-(p-diethylaminophenyl)aminoanilino-6-diethylaminofluoran, 2-p-(p-phenylaminophenyl)aminoanilino-6-phenylfluoran, 2-p-(p-phenylaminophenyl)aminoanilino-6-benzylfluoran, 2-p-(p-phenylaminophenyl)aminoanilino-6-hydroxyfluoran, 2-p-(p-dimethylaminophenyl)aminoanilino-6-methylfluoran, 2-p-(p-diethylaminophenyl)aminoanilino-6-diethylaminofluoran, 2-p-(p-phenylaminophenyl)aminoanilino-6-diethylaminofluoran, 3-p-(p-dimethylaminophenyl)aminoanilino-7-methylfluoran, 3-p-(p-dimethylaminophenyl)aminoanilino-7-methoxyfluoran, 3-p-(p-dimethylaminophenyl)aminoanilino-7-chlorofluoran, 3-p-(p-diethylaminophenyl)aminoanilino-7-nitrofluoran, 3-p-(p-diethylaminophenyl)aminoanilino-7-aminofluoran, 3-p-(p-diethylaminophenyl)aminoanilino-7-diethylaminofluoran, 3-p-(p-phenylaminophenyl)aminoanilino-7-phenylfluoran, 3-p-(p-phenylaminophenyl)aminoanilino-7-benzylfluoran, 3-p-(p-phenylaminophenyl)aminoanilino-7-hydroxyfluoran, 3-p-(p-dimethylaminophenyl)aminoanilino-7-methylfluoran, 3-p-(p-diethylaminophenyl)aminoanilino-7-diethylaminofluoran, and 3-p-(p-phenylaminophenyl)aminoanilino-7-diethylaminofluoran.
__________________________________________________________________________Na  R1   R2       (X1)m                       (X2)m                              (X3)4__________________________________________________________________________1   CH3   CH3      H     p-OCH3                              (Br)42   "   "             "     "      5-Cl                              (Br)33   "   "             "     p-OC4 H9                              5,6-(Cl)2                              (Br)24   "   "             "     p-OC6 H13                              (Br)45   "   "             "     H      "6   "   "             "     p-CH3                              "7   "   "             "     "      5-Cl                              (Br)38   "   "             "     p-tert-C4 H9                              (Br)49   "   "             "     m,p-(OCH3)2                              "10  C2 H5   C2 H5                 "     p-OCH3                              "11  "   "             "     p-CH3                              "12  "   "             m-CH3                       p-OCH3                              "13  C4 H9   C4 H9                 H     p-OC2 H5                              "14  C2 H5   iso-C5 H11                 "     p-tert-C4 H9                              "15  C2 H5    ##STR7##     "     p-OCH3                              "16  CH3    ##STR8##     "     "      "17  C2 H5    ##STR9##     m-OCH3                       m,p-(CH3)2                              5-Cl (Br)3__________________________________________________________________________
Among the divinyl compound of the general formula (II), 3, 3-bis[2-(p-dimethylaminophenyl)-2-(p-methoxyphenyl) ethenyl]- 4, 5, 6, 7 - tetrabromophthalide (m.p.: 133�-135� C.) is most preferable, taking the productivity, costs and performances into consideration.
In the general formula (III), the "C1 -C12 alkyl group" and "C1 -C12 alkoxy group" may be linear or branched, and include, for example, methyl, ethyl, npropyl, isopropyl, n-butyl, iso-butyl, sec-butyl, hexyl, octyl, nonyl, dodecyl, methoxy, ethoxy, tert-butoxy, and the like. The C3 -C10 cycloalkyl group includes, for example, cyclohexyl, 2-ethylcyclohexyl, p-tertbutylcyclohexyl, and the like.
The halogen-substituted zinc benzoate derivatives of this invention are colorless materials having a high-melting point, which can be produced by reaction of the halogen-substituted benzoic acid sodium salts with zinc sulfate.
The above stabilizer of this invention is a compound having a particular molecular-structure selected from many organic carboxylic acid metal salts. The benzoic acid zinc salts having 1-2 halogen substituents on the benzene ring have excellent light-, weight- and oil-resistances, which are not seen in similar free organc carboxylic acids or their polyvalent-metal salts.
Typical examples of the zinc benzoate derivatives used in this invention are shown below. It should be understood, however, that they are merely illustrative, and the scope of this invention is not limited thereby. ##STR10##
The preferable organic color-developing agent of this invention are: bisphenols-A, 4-hydroxybenzoic acid esters, 4-hydroxyphthalic acid diesters, phthalic acid monoesters, bis-(hydroxyphenyl) sulfides, 4-hydroxyphenyl arylsulfonate, 4-hydroxyphenyl arylsulfonates, 1,3-di[2-(hydroxyphenyl)-2-propyl]benzenes, 4-hydroxybenzoyl oxybenzoic acid esters, bisphenol sulfonates and the like. Examples of these color-developing agents are as follows:
4,4'-isopropylidenediphenols(bisphenol A)
p,p'-(1-methyl-normalhexylidene)diphenol 1,7-di(4-hydroxyphenylthio)-3,5-dioxaheptane
4-hydroxybenzoic acid esters
4-hydroxyphthalic acid dimethylester
Bis-(4-hydroxy-2,5-dimethylpheyl)sulfide
Bis-(4-hydroxy-2,5-diethylphenyl)sulfide
Bis-(4-hydroxy-2,3,6-trimethjylphenyl)sulfide
4-hydroxyphenyl- methylene sulfonate
1,3-di[2-(4-hydroxy-3-alkylphenyl)2-propyl]-benzene
1,3-di[2-(2,4-dihydroxyphenl)-2-propyl]-benzene
1,3-di[2-hydroxy-5-methylphenyl)-2-propyl]-benzene
4-hydroxybenzoyloxybenzoic acid butyl ester
4-hydroxybenzoyloxybenzoic acid cyclohexyl ester
4-hydroxybenzoyloxybenzoic acid β-phenethyl ester
Bis-(3-1-butyl4-hydroxy-6-methylphenyl)sulfone
Bis(2-isopropyl-4-hydroxyphenyl)sulfone
Bis-(2ethyl-4-hydroxyphenyl)sulfone
Bis-2,5-dimethyl-4-hydroxyphenyl)sulfone
4-hydroxyphenyl-2'-isopropyl-4'-hyroxyphenylsulfone
4-hydroxyphenyl-3'-sec-butyl-4'-hyroxyphenylsulfone
3-chloro-4-hydroxyphenyl-3--isopropyl-4'-hydroxyphenylsulfone
4-hydroxy-5-t-butylphenyl-4'-hydroxyphenylsulfone
2-hydroxy-5-t-amynophenyl-4'-hydroxyphenylsulfone
2-hydroxy-5-t-butylphenyl-3'-methyl-4'-hyroxyphenylsulfone
2-hydroxy-5-t-butylphenyl-3'-isopropyl-4-hydroxyphenylsulfone
3,3'-diamio-4,4'-sulfonyldiphenol
benzyl4-hydroxyphenyl acetate
In order to improve the optical readability in the near infrared region, fluorene type leuco dyes, other divinyl-type phthalide derivatives than those of the general formula (II), sulfonylmethane derivative, etc. may be used in combination with the fluorane-type leuco dye of the general formula (I), and fluorene-type leuco dyes, sulfonylmethane derivatives, fluorane-type leuco dyes other than those of the general formula (I), etc. may be used in combination with the divinyl-type phthalide derivative of the general formula (II).
The preferable fluorene-type leuco dyes of this invention are the near infrared-absorbing leuco dyes represented by the following formula (VII). ##STR11## wherein R21, R22, R23, R24, R25 and R26, which may be the same or different, represent a hydrogen atom; a C1 -C8 alkyl group; a C5 -C8 cycloalkyl group; a C3 -C8 alkoxyalkyl group; a C3 -C9 unsaturated alkyl group, a tetrahydrofurfuryl group; a tetrahydropyran-2-methyl group; an alkyl group which may be substituted by a halogen atom, a C1 -C4 alkyl group and/or a C1 -C4 alkoxy group; an aryl group which may be substituted by a halogen atom, a C1 -C4 alkyl group and/or a C1 -C4 alkoxy group; a C2 -C8 alkyl group having a phenoxy group which may be substituted by a halogen atom, a C1 -C4 alkyl group and/or a C1 -C4 alkoxy group; in addition, R21 and R22, R23 and R24, or R25 and R26 taken together with each other or with an attached benzene ring may form a heterocyclic ring.
The leuco dyes represented by the general formula (VII) are not limited, the typical examples are, however, 3,6-bis(dimethylamino)fluororene-9-spiro-3'-(6'-dimethylamino)phthalide and 3,6-bis(diethylamino)fluorene-9-spiro-3'-(6'-diethylamino)phthalide.
The preferable divinylphthalide derivatives used in combination with the fluoran-type leuco dye of the general formula (I) are near infrared-absorbing leuco dyes represented by the general formula (VIII): ##STR12## wherein
R27, R28, R29 and R30, which may be the same or different, represent a C1 -C8 alkyl group, a C5 -C8 cycloalkyl group, a C3 -C8 alkoxyalkyl group, an aryl group which may be substituted by a halogen atom, a C1 -C4 alkyl group and/or a C1 -C4 alkoxy grup, or an alkyl group which may be substituted by a halogen atom, a C1 -C4 alkyl group and/or a C1 -C4 alkoxy group, in addition, R27 and R28, or R29 and R30 taken together with each or with an attached benzene ring may form a heterocyclic ring;
R31 and R32, which may be the same or different, represent a hydrogen atom, a halogen atom, a C1 -C4 alkyl group, a C1 -C4 alkoxy group, or an acyloxy group;
R33 represents a hydrogen atom, or a C1 -C4 alkyl group;
a, b, c and d represent carbon atoms, or one or two of a, b, c and d may represent a nitrogen atom, in addition, the carbon atoms of a, b, c and d may have as substituent a hydrogen atom, a halogen atom, a C1 -C8 alkyl group, a C1 -C4 alkoxy group, a C2 -C16 dialkylamino group or a nitro group; and the bonding of a-b, b-c or c-d may form the other aromatic ring.
The preferable sulfonylmethane derivatives are the near infrared-absorbing leuco dye of the following general formula (IX) ##STR13## wherein R41, R42, R43 and R44 which may be the same or different, represent a hydrogen atom, or a substituted or unsubstituted alkyl group;
R45 and R46, which may be the same or different, represent a hydrogen atom, or a substituted or unsubstituted phenyl group; and
R47 represents a substituted or unsubstituted alkyl group, or a substituted or unsubstituted phenyl group.
The leuco dyes represented by the general formula (IX) are not limited, the typical examples are, however, bis(p-dimethylaminostyryl)-p-methylphenylsulfonylmethane, bis(p-diethylaminostyryl)-p-methylphenylmethane and bi(p-dimethylaminostyryl)benzenesulfonylmethane.
As sensitizer, there may be used fatty acid amide such as stearic acid amide, palmitic acid amide; ethylenebisamide; montan wax; polyethylene wax; dibenzyl terephthalate; benzyl p-benzyloxybenzoate; di-p-tolyl carbonate; p-benzylbiphenyl, phenyl α-naphthylcarbonate; 1,4-diethoxynaphthalene; 1-hydroxy-2-naphthoic acid phenyl ester; and the like.
The species and the amount of organic color-developing agent, colorless basic chromogenic dye and other ingredients, which are used in this invention, are determined depending upon the performance and recording aptitude required for the recording material, and are not otherwise limited. However, in ordinary cases, it is suitable to use 1-8 parts by weight of organic color developing agent, 0.1-5 parts by weight of stabilizer and 1-20 parts by weight of filler, based on 1 part by weight of colorless basic chromogenic dye, and to add 10-25 parts by weight of a binder in total solid content.
The above organic color-developing agent, the above colorless basic chromogenic dye, and if necessary, other ingredients are ground to a particle size of several microns or smaller by means of a grinder or emulsifier such as a ball mill, attritor, sand grinder, etc., and binders and various additives in accordance with the purpose, are added thereto to prepare coating color. Such additives ar as follows: filler; releasing agent for prevention of sticking, such as fatty acid metal salt; anti-fogging agent such as fatty acid amide, ethylenebisamide, montan wax, polyethylene wax etc.; dispersant such as sodium dioctylsulfosuccinate, sodium dodecylbenzene sulfonate, sodium lauryl alcohol sulfate, sodium alginate; UV-absorber such as benzophenone type or triazole type; antifoamer; fluorecent brightening agent; water resistance agent; and so on.
The reason why the heat-sensitive recording sheet of this invention provides a superior optical readability in the near infrared region is thought as follows. The color image in using electron-donating color-former such as conventional fluroane-type leuco dyes does not absorb the light of near infrared region. However, the fluorane-type leuco dyes of the general formula (I) or the divinyl compounds of the general formula (II) absorb the light of near infrared region (specifically the near infrared region of 700-1500 nm) efficiently in a heat-melt reaction with an electron acceptor (color-developing agent).
The reason why the recorded image of a heat-sensitive recording material of this invention is excellent in light-resistance, weather-resistance and oil resistance is explained as follows. Generally, a heat-sensitive recording material is composed of colorless basic dye as electron donor and of organic acidic material, such as phenolic material, aromatic carboxylic acid, organic sulfonic acid, etc. as electron acceptor. The heat-melt reaction between a colorless basic dye and a color-developing agent is an acid-base reaction based on donating-acceptance of electron, whereby a pseudo-stable "electron charge transfer complex" is produced, which forms color.
On the other hand, the chemical binding force in the above reaction between the florane-type leuco dye of this invention and the organic developing agent is very weak. In the halogen-substituted zinc benzoate derivative, the halogen atom which is bonded to a benzene-skelton, causes a decrease of an electronic density on a metal through n-electrons of a benzene ring since it has a high electron-attractive force. Further, zinc is a transient metal atom having electron-acceptive, vacant d-orbital, in contrary to the other polyvalent metals (magnesium, aluminum, calcium, titanium, manganese, tin and nickel).
Accordingly, in the heat-melt reaction, the halogen-substituted zinc benzoate derivatives produces a prominent increase of the chemical bonding force between an organic color-developing agent and each of the fluorane-type leuco dye represented by the general formula (I) and the divinyl compound represented by the general formula (II), and hence it seems that the chemical bondings do not deteriorate for a long period even under the circumstance of light, heat, humidity, etc., so that a recorded image is remarkably stable, which does not lower the optical readability of the recorded image in the near infrared region. And the reason for a superior thermal responsibility in using the divinyl compound of the general formula (II) is as follows. The halogen-substituted zinc benzoate derivative has an excellent color-developing ability, and product a synergism in combination with another organic color-developing agent, which increases a color-developing sensitivity prominently.
The following examples illustrate the invention, although this invention is not limited to examples. The parts are parts by weight.
[Example 1 (Test No. 1-2)]
______________________________________Liquid A (dye dispersion)Colorless basic dye (see Table 1)2.0 parts10% aqueous solution of polyvinyl alcohol4.6 partsWater2.6 partsLiquid B (dispersion of color-developing agent)4,4'-isopropylidenediphenol6.0 parts10% aqueous solution of polyvinyl alcohol18.8 partsWater11.2 partsLiquid C (dispersion of stabilizer)Stabilizer (see Table 1)4.0 parts10% aqueous solution of polyvinyul alcohol9.2 partsWater5.2 parts______________________________________
______________________________________Liquid A           9.2 partsLiquid B           36.0 partsLiquid C           18.4 partsKaolin clay        12.0 parts(50% aqueous dispersion)______________________________________
The coating color was applied on one side of a base paper weighing 50 g/m2 at a coating weight of 6.0 g/m2 and thend dried. The resultant paper was treated to a smoothness of 200-600 seconds by a supercalender. In this manner, a heat-sensitive recording sheet was obtained.
[Example 2 (Test Nos. 3-6)]
______________________________________Liquid A (Dye dispersion 1)Colorless basic dye (see Table 1)                   1.0 part10% aqueous solution of polyvinyl alcohol                   2.3 partsWater                   1.3 partsLiquid D (Dye dispersion 2)Colorless basic dye (see Table 1)                   1.0 part10% aqueous solution of polyvinyl alcohol                   2.3 partsWater                   1.3 parts______________________________________
______________________________________Liquid A (dye dispersion 1)                    4.6 partsLiquid D (dye dispersion 2)                    4.6 partsLiquid C (dispersion of stabilizer)                    18.4 partsLiquid B (dispersion of color-developing agent)                    36.0 partsKaolin clay              12.0 parts(50% aqueous dispersion)______________________________________
[Comparative Example 1 (Test Nos. 7-9)]
A heat-sensitive recording sheet was obtained in the same manner as in Example 1 except that Liquid C is not used. With regard to the heat-sensitive recording sheets of Examples No. 1 and No. 2 and Comparative Example 1, the test results are shown in Tables 1 and 2.
TABLE 1__________________________________________________________________________Test Results                                                 Image density                                                 Static                                                     Dyna-  Test No.       Stabilizer    Colorless basic dye 1                                   Colorless basic dye                                                 (1) mic(2)__________________________________________________________________________Example 1  1    p-chlorobenzoic acid zinc                     2-chloro-3-methyl-6-p-(p-                                   --            1.38                                                     0.74       salt          phenylaminophenyl)amino-                     anilinofluorane  2    m-chlorobenzoic acid zinc                     2-methyl-6-p-(p-                                   --            1.37                                                     0.75       salt          dimethylaminophenyl)ami-                     noanilinofluoraneExample 2  3    p-chlorobenzoic acid zinc                     2-chloro-3-methyl-6-p-(p-                                   3,6-bis(dimethyl-                                                 1.30                                                     0.72       salt          phenylaminophenyl)amino-                                   amino)fluorene-9-spiro-3'-                     anilinofluorane                                   (6'-dimethylamino)phthalide  4    m-chlorobenzoic acid zinc                     2-methyl-6-p-(p-                                   3,6-bis(dimethyl-                                                 1.31                                                     0.73       salt          dimethylaminophenyl)ami-                                   amino)fluorene-9-spiro-3'-                     noanilinofluorane                                   (6'-dimethylamino)phthalide  5    3,4-dichlorobenzoic acid zinc                     2-chloro-3-methyl-6-p-(p-                                   3,3-bis[1,1-bis(4-pyrrolidino-                                                 1.29                                                     0.71       salt          phenylaminophenyl)amino-                                   phenyl)ethylene-2-yl]-                     anilinofluorane                                   4,5,6,7-tetrachlorophthalide  6    3,4-dichlorobenzoic acid zinc                     2-methyl-6-p-(p-                                   3,3-bis[1,1-bis(4-pyrrolidino-                                                 1.29                                                     0.72       salt          dimethylaminophenyl)ami-                                   phenyl)ethylene-2-yl]-                     noanilinofluorane                                   4,5,6,7-tetrachlorophthalideComparative  7    --            2-chloro-3-methyl-6-p-(p-                                   --            1.25                                                     0.74Example 1                 phenylaminophenyl)amino-                     anilinofluorane  8    --            2-methyl-6-p-(p-                                   --            1.24                                                     0.73                     dimethylaminophenyl)ami-                     noanilinofluorane  9    --            3,6-bis(dimethyl-                                   --            1.13                                                     0.71                     amino)fluorene-9-spiro-3'-                     (6'-dimethylamino)phthalide__________________________________________________________________________
TABLE 2__________________________________________________________________________Test Results          Light resistance (4)                          Oil resistance (5)                                          Weather resistance (6)                      In-             In-             In-     Infrared     Per-                      frared      Per-                                      frared      Per-                                                      frared     reflec-          Before              After                  cent                      reflec-                          Before                              After                                  cent                                      reflec-                                          Before                                              After                                                  cent                                                      reflec-  Test     tance          treat-              treat-                  residue                      tance                          treat-                              treat-                                  residue                                      tance                                          treat-                                              treat-                                                  residue                                                      tance  No.     (%) (3)          ment              ment                  (%) (%) ment                              ment                                  (%) (%) ment                                              ment                                                  (%) (%)__________________________________________________________________________Example 1  1  25   0.74              0.74                  100 25  0.74                              0.72                                  97  28  0.74                                              0.73                                                  99  26  2  26   0.75              0.7 100 26  0.75                              0.74                                  99  27  0.75                                              0.73                                                  97  27Example 2  3  22   0.72              0.72                  100 22  0.72                              0.70                                  98  24  0.72                                              0.71                                                  99  23  4  22   0.73              0.73                  100 22  0.73                              0.71                                  97  24  0.73                                              0.71                                                  97  24  5  21   0.71              0.70                  99  21  0.71                              0.70                                  99  23  0.71                                              0.70                                                  99  23  6  21   0.72              0.71                  99  21  0.72                              0.71                                  99  23  0.72                                              0.70                                                  98  23Comparative  7  35   0.74              0.65                  88  49  0.74                              0.36                                  49  75  0.74                                              0.58                                                  78  57Example 1  8  34   0.73              0.64                  87  50  0.73                              0.36                                  49  74  0.73                                              0.57                                                  78  55  9  35   0.71              0.30                  42  80  0.71                              0.10                                  14  99  0.71                                              0.40                                                  56  73__________________________________________________________________________ Notes (1) Static image density A heatsensitive recording sheet is pressed down for 5 seconds under pressure of 10 kg/cm2 on a hot plate heated at 135� C., and the optical density is measured by a Macbeth densitometer (RD914, using amber filter which is used in other samples). (2) Dynamic image density A heatsensitive recording sheet is recorded with an impressed voltage of 18.03 Volt and a pulse width of 3.2 milliseconds by using the thermal facsimile KB4800 manufactured by TOSHIBA CORPORATION, and the optical density of the recorded image is measured by a Macbeth densitometer. (3) Reflectance of infrared ray The recorded image printed in Note (1) is measured by a spectrophotometer (using a wave length of 940 nm). (4) Light resistance The image density obtained in Note (2) is defined as image density before light treatment. The recorded image is subjected to irradiation by light for 2 hours using a fadeO-meter, and then the image density (after light treatment) is measured. Residual rate is calculated from the following equation. ##STR14## And the reflectance of infrared red ray is measured with respect to the recorded image after light irradiation. (5) Oil resistance The image density obtained in Note (2) is defined as image density before oil treatment. A drop of castor oil is applied on the recorded image, and wished off with filter paper after 10 sec. The obtained paper allows to stand for 24 hours at room temperature, and image density after oil treatment is measured. Residual rate is calculated from the following equation. ##STR15## - And the reflectance of infrared ray is measured with respect to the recorded image after oil treatment. (6) Weather resistance The image density obtained in Note (2) is defined as image density before treatment. The recorded image allows to stand for a week under the conditions of 40� C. and 90% RH, and then the image density is measured by Macbeth densitometer. ##STR16## - And the reflectance of infrared ray is measured by spectrophotometer (using a wave length of 940 nm) with respect to the recorded image after treatment.
[Example 3 (Test Nos. 10-15)]
______________________________________Liquid A (dye dispersionColorless basis dye (see Table 3)                    2.0 parts10% aqueous solution of polyvinyl alcohol                    4.6 partsWater                    2.6 partsLiquid B (dispersion of color-developing agent)Color-developing agent (see Table 3)                    4.0 parts10% aqueous solution of polyvinyl alcohol                    18.8 partsWater                    11.2 partsLiquid C (dispersion of stabilizer)Stabilizer (see Table 3) 4.0 parts10% aqueous solution of polyvinyl alcohol                    9.2 partsWater                    5.2 parts______________________________________
Each liquid of the above-mentioned composition was ground to an average particle size of 1 micron by an attritor. Then dispersions were mixed in the following portion to prepare a coating color.
______________________________________Liquid A (dye dispersion)                   9.2 partsLiquid B (dispersion of color-developingagent)                  36.0 partsLiquid C (dispersion of stabilizer)                   18.4 partsKaolin clay (50% aqueous solution)                   12.0 parts______________________________________
[Comparative Example 2 (Test Nos. 16-18)]
A heat-sensitive recording sheet was obtained in the same manner as in Example 3 except that Liquid C is not used. With regard to the heat-sensitive recording sheets of Example No. 3 and Comparative Example 2, the test results are shown in Tables 3 and 4.
TABLE 3__________________________________________________________________________Test Result                                                 Image density                                                      Dy-Test                                                  Static                                                      namicNo.      Color-developing agent                    Stabilizer                              Colorless basic dye                                                 (1)  (2)__________________________________________________________________________Example 3 10 4,4'-           p-chlorobenzoic                              3,3-bis[2-(p-dimethylaminophenyl)-2-(p-                              2                  1.50 1.19    isopropylidenediphenol                    acid zinc salt                              methoxyphenyl)ethenyl]-4,5,6,7-                              tetrabromophthalide 11 4,4'-           m-chlorobenzoic                              3,3-bis[2-(p-dimethylaminophenyl)-2-(p-                                                 1.49 1.18    isopropylidenediphenol                    acid zinc salt                              methoxyphenyl)ethenyl]-4,5,6,7-                              tetrabromophthalide 12 1,7-di(4-hydroxyphenylthio)-3,5-                    p-chlorobenzoic                              3,3-bis[2-(p-dimethylaminophenyl)-2-(p-                              8                  1.51 1.19    dioxaheptane    acid zinc salt                              methoxyphenyl)ethenyl]-4,5,6,7-                              tetrabromophthalide 13 1,8-di(4-hydroxyphenylthio)-3,6-                    m-chlorobenzoic                              3,3-bis[2-(p-dimethylaminophenyl)-2-(p-                              .                  1.50 1.18    dioxaoctane     acid zinc salt                              methoxyphenyl)ethenyl]-4,5,6,7-                              tetrabromophthalide 14 4-hyrdoxy-4'-   3,4-dichlorobenzoic                              3,3-bis[2-(p-dimethylaminophenyl)-2-                                                 1.48 1.19    isopropoxydiphenylsulfone                    acid zinc salt                              (m,p-dimethoxyphenyl)ethenyl]-4,5,6,7-                              tetrabromophthalide 15 4-hydroxy-4'-   3,4-dichlorobenzoic                              3,3-bis[2-(p-dimethylaminophenyl)-2-                                                 1.50 1.18    isopropoxydiphenylsulfone                    acid zinc salt                              (m,p-dimethoxyphenyl)ethenyl]-4,5,6,7-                              tetrabromophthalideCompara- 16 4,4'-isopropylidenediphenol                    --        3,3-bis[2-(p-dimethylaminophenyl)-2-p-                                                 1.11 1.03tive                               methoxyphenyl)ethenyl]-4,5,6,7-Example 2                          tetrabromophthalide 17 1,7-di(4-hydroxyphenylthio)-3,5-                    --        3,3-bis[2-(p-dimethylaminophenyl)-2-p-                                                 1.10 1.01    dioxaheptane              methoxyphenyl)ethenyl]-4,5,6,7-                              tetrabromophthalide 18 4-hydroxy-4'-   --        3,3-bis[2-(p-dimethylaminophenyl)-2-p-                                                 1.11 1.00    isopropoxydiphenylsulfone methoxyphenyl)ethenyl]-4,5,6,7-                              tetrabromophthalide__________________________________________________________________________
TABLE 4__________________________________________________________________________Test Results          Light resistance (4)                          Oil resistance (5)                                          Weather resistance (6)                      In-             In-             In-     Infrared     Per-                      frared      Per-                                      frared      Per-                                                      frared     reflec-          Before              After                  cent                      reflec-                          Before                              After                                  cent                                      reflec-                                          Before                                              After                                                  cent                                                      reflec-  Test     tance (%)          treat-              treat-                  residue                      tance                          treat-                              treat-                                  residue                                      tance                                          treat-                                              treat-                                                  residue                                                      tance  No.     (3)  ment              ment                  (%) (%) ment                              ment                                  (%) (%) ment                                              ment                                                  (%) (%)__________________________________________________________________________Example 3  10 11   1.19              1.09                  92  25  1.19                              1.15                                  97  13  1.19                                              1.03                                                  87  28  11 11   1.18              1.07                  91  24  1.18                              1.16                                  98  14  1.18                                              1.00                                                  85  27  12 12   1.19              1.09                  92  27  1.19                              1.16                                  97  15  1.19                                              1.02                                                  86  29  13 11   1.18              1.08                  92  25  1.18                              1.14                                  97  14  1.18                                              1.02                                                  86  27  14 12   1.19              1.08                  91  26  1.19                              1.17                                  98  15  1.19                                              1.02                                                  86  28  15 11   1.18              1.06                  90  25  1.18                              1.16                                  98  15  1.18                                              1.00                                                  85  27Comparative  16 17   1.03              0.62                  60  70  1.03                              0.50                                  49  80  1.03                                              0.41                                                  40  90Example 2  17 18   1.01              0.61                  60  72  1.01                              0.49                                  49  82  1.01                                              0.39                                                  39  91  18 20   1.00              0.60                  60  71  1.00                              0.48                                  48  85  1.00                                              0.38                                                  38  92__________________________________________________________________________ Notes (1), (2) and (5) are measured in the same manner as in Notes (1), (2) and (5) of Tables 1 and 2. (3) Reflectance of infrared ray The recorded image printed in Note (2) is measured by a spectrophotometer (using a wave length of 1000 nm). (4) Light resistance The light resistance is measured in the same manner as in that of Tables and 2 except using an irradiation by light for 4 hours. (6) Weather resistance The weather resistance is measured in the same manner as in that of Table 1 and 2 except that the recorded image allows to stand for 24 hours and that a wave length used in spectrophotometer is 1000 nm.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4761396 *Feb 5, 1987Aug 2, 1988Kanzaki Paper Manufacturing Co., Ltd.Heat-sensitive recording materialJPH0274687A * Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS4971942 *Jan 17, 1989Nov 20, 1990Jujo Paper Co., Ltd.Heat-sensitive recording materialUS5061536 *Feb 5, 1990Oct 29, 1991Jujo Paper Co., Ltd.Optical recording mediumUS5100711 *Feb 5, 1990Mar 31, 1992Jujo Paper Co., Ltd.Optical recording medium optical recording method, and optical recording device used in methodUS5146087 *Jul 23, 1991Sep 8, 1992Xerox CorporationImaging process with infrared sensitive transparent receiver sheetsUS5200947 *Dec 20, 1991Apr 6, 1993Jujo Paper Co., Ltd.Optical recording medium, optical recording method, and optical recording device used in methodUS5348930 *Apr 2, 1993Sep 20, 1994Nicca Chemical Co., Ltd.Heat sensitive recording materialUS5441418 *May 20, 1993Aug 15, 1995Binney & Smith Inc.Thermochromic drawing deviceUS5514635 *Dec 29, 1993May 7, 1996Optum CorporationThermal writing surface and method for making the sameUS7198834Mar 22, 2005Apr 3, 2007Hewlett-Packard Development Company, L.P.Imaging media including interference layer for generating human-readable marking on optical mediaUS7993807Apr 28, 2004Aug 9, 2011Hewlett-Packard Development Company, L.P.Compositions, systems, and methods for imagingUS20050244741 *Apr 28, 2004Nov 3, 2005Vladek KasperchikCompositions, systems, and methods for imagingUS20060153608 *Jan 10, 2005Jul 13, 2006Xerox CorporationSystem and method for determining printing media is appropriate for use in a printer/copierUS20060216456 *Mar 22, 2005Sep 28, 2006Gore Makarand PImaging media including interference layer for generating human-readable marking on optical mediaUS20070065623 *Sep 21, 2005Mar 22, 2007Vladek KasperchikLaser-imageable coating based on exothermic decompositionUS20070065749 *Sep 21, 2005Mar 22, 2007Vladek KasperchikRadiation-markable coatings for printing and imagingUS20070086308 *Oct 13, 2005Apr 19, 2007Gore Makarand PSystems and methods for imagingWO2005106582A1 *Apr 21, 2005Nov 10, 2005Hewlett-Packard Development Company, L.P.Compositions, systems, and methods for imaging* Cited by examinerClassifications U.S. Classification503/209, 503/220, 503/221, 503/217, 428/914, 503/223, 428/913, 427/151International ClassificationB41M5/30, B41M5/327, B41M5/337Cooperative ClassificationY10S428/913, Y10S428/914, B41M5/327, B41M5/3377, B41M5/3275European ClassificationB41M5/337M, B41M5/327Legal EventsDateCodeEventDescriptionAug 19, 1988ASAssignmentOwner name: JUJO PAPER CO., LTD., NO. 21-1, OJI 5-CHOME, KITA-Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:SATAKE, TOSHIMI;FUKUCHI, TADAKAZU;MINAMI, TOSHIAKI;AND OTHERS;REEL/FRAME:004954/0224Effective date: 19880808Owner name: JUJO PAPER CO., LTD.,JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SATAKE, TOSHIMI;FUKUCHI, TADAKAZU;MINAMI, TOSHIAKI;AND OTHERS;REEL/FRAME:004954/0224Effective date: 19880808Jan 19, 1993FPAYFee paymentYear of fee payment: 4Nov 15, 1994ASAssignmentOwner name: NIPPON PAPER INDUSTRIES CO., LTD., JAPANFree format text: CHANGE OF NAME;ASSIGNOR:JUJO PAPER CO., LTD.;REEL/FRAME:007205/0291Effective date: 19940805Mar 11, 1997REMIMaintenance fee reminder mailedAug 3, 1997LAPSLapse for failure to pay maintenance feesOct 14, 1997FPExpired due to failure to pay maintenance feeEffective date: 19970806RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services