JPH0325443A - Photosensitive body and image forming method - Google Patents

Abstract

PURPOSE:To form polymerized images having a good sensitivity and good contrast by using a photosensitive body contg. a silver halide or a material to form the silver halide, org. silver salt, reducing agent, polymerizable polymer precursor, polymn. initiator, and reactive thermodiffusive dyestuff. CONSTITUTION:The photosensitive body contg. the silver halide or the material to form the silver halide, the org. silver salt, the reducing agent, the polymerizable polymer precursor, the polymn. initiator, and the reactive thermodiffusive dye is used. Namely, the photosensitive silver halide is used and, therefore, the sensitivity in image exposing is high and since the reactive thermodiffusive dyestuff is used, the transfer quantity of the dyestuff is easily controllable according to the latent image quantity of the image exposure. The color images having less color fogging are thus formed. The polymerized images having the good sensitivity and the good contrast are formed in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a silver salt-based photoreceptor for forming an image,
and an image forming method using the photoreceptor.

[Prior Art 1] In recent years, there has been active development of image forming methods that can form images through simple processing.

For example, a method is known from JP-A No. 61-69062, etc., in which a photosensitive reaction of silver halide is used as a trigger to cause a dry (thermal) polymerization reaction to form a latent image made of a polymer.

For example, according to Japanese Patent Application Laid-Open No. 62-70836, etc.
A latent image is formed by silver nuclei generated from silver halide through image exposure, and the catalytic action of the silver nuclei is used to convert the reducing agent into an oxidant having a polymerization inhibiting ability different from that of the reducing agent under heating. By doing so, a difference is created in the ability to inhibit polymerization between the reducing agent and the generated oxidant, and a thermal polymerization reaction using a thermal polymerization initiator is caused, forming a latent polymer image corresponding to the difference in ability to inhibit polymerization. It is a method. An image made of the polymer can be obtained by selectively adhesively transferring or etching the polymerized portion or the unpolymerized portion from such a latent polymer image made of the polymerized portion and the unpolymerized portion.

However, these methods have the disadvantage that it is difficult to obtain good contrast in the polymer latent image.

This drawback is that the redox reaction for producing oxidants and the polymerization reaction for forming a latent polymer image occur in the same heat treatment process, so these reactions become competitive reactions, and each This is thought to be because the reaction does not proceed efficiently.

Therefore, it has been relatively difficult to obtain contrast in the image forming method in which a color image is formed by selectively transferring heat-diffusible dyes from the polymerized image produced by the above method according to the degree of polymerization. [Problem to be Solved by the Invention 1] The object of the present invention is to provide an image forming method that can form a polymerized image with good sensitivity and good contrast, and can form a color image in a completely dry manner according to the polymerized image; It is a method that can form a color image with excellent brightness and saturation and little color fog.

[Means to solve the problem]

As a result of intensive research to achieve the above objectives, we have found that silver halide, substances that form silver halide, organic silver salts,
It has been found that this can be achieved by using a photoreceptor characterized in that it contains a reducing agent, a polymerizable polymer precursor, a polymerization initiator, and a reactive heat-diffusive dye.

In other words, since it uses photosensitive silver halide, it has high sensitivity during imagewise exposure, and because it uses a reactive heat-diffusible dye, it is easy to control the amount of dye transferred according to the amount of latent image during imagewise exposure. , it is possible to form color images with less color fog.

The image formation or process of the present invention consists of the following steps.

(a) A latent image consisting of silver nuclei is formed on silver halide by imagewise exposure. (b) Heating is performed simultaneously with or after forming the latent image to induce an oxidation-reduction reaction between the organic silver salt and the reducing agent to form a secondary latent image composed of the reducing agent and the oxidant.

(C) By exposing the entire surface to light, a photoreaction occurs according to the secondary latent image, the reactive heat diffusive dye and the polymerizable polymer precursor react, and the reactivity of the dye in the image-exposed area and the unexposed area changes. The polymerizable polymer precursors have different degrees of polymerization.

(d) Transfer the reactive heat-diffusible dye to receiver paper. The present invention provides an image forming method with extremely low color fog in order to control the amount of dye transferred by the degree of reactivity of a heat-diffusible dye contained in a photoreceptor and the degree of polymerization of a polymerizable polymer precursor in response to image exposure. be.

- Examples of light sources used in (a) and (C) of the present invention include sunlight, tungsten lamps, mercury lamps, halogen lamps, xenon lamps, fluorescent lamps, and LEDs.
, laser beams, etc., and the wavelengths of light used in these processes may be the same or different. Furthermore, even if light of the same wavelength is used in steps (a) and (C),
Silver halide usually has a photosensitivity that is sufficiently higher than that of the photopolymerization initiator, so that sufficient latent image writing can be carried out with light having an intensity that does not cause photopolymerization in step (a).

Further, in the step (C) above, a means for heating the photoreceptor during exposure may be used. This may be done by newly heating or by using preheating in the step (b).

The heating temperature in (b) is 60 to 200°C, preferably 80 to 160°C, more preferably ioo to 13°C.
0°C, heating time is 0.1 seconds to 5 minutes, preferably
It is 1 second to 1 minute, more preferably 5 to 40 seconds. Generally, high-temperature heating requires a short treatment time, while low temperature heating requires a longer treatment time.

As the heating means, in addition to a method using a hot plate, a heat roll, a thermal head, etc., there can be used a method of heating by supplying electricity to a heating element of the support, a method of heating by laser beam irradiation, and the like.

Since the photoreaction that occurs in (C) is caused by radical species, it is necessary to provide an oxygen barrier layer to prevent the radical reaction from being interfered with by oxygen in the atmosphere. The oxygen barrier layer may be in the form of an overcoat on the photosensitive layer or in the form of microcapsules that enclose the photosensitive material. Further, the photosensitive layer is formed in a single layer structure or a multilayer structure, and the microcapsules can be simple single-cell capsules or double capsules in which the core substance is separated in function.

Each component contained in the photoreceptor of the present invention will be explained in detail below.

Examples of the silver halide used in the photoreceptor of the present invention include silver chloride, silver bromide, silver chlorobromide, silver iodobromide, and silver chloroiodobromide. It may be subjected to chemical sensitization or optical sensitization treatment similar to that used for other materials. That is, as chemical sensitization, sulfur sensitization, noble metal sensitization, reduction sensitization, etc. can be used, and as optical sensitization, methods using conventionally well-known sensitizing dyes can be applied. Furthermore, the halogen groups within the particles may be uniform or may have different multiple structures. Further, two or more types of silver halides having different halogen compositions, grain sizes, grain size distributions, etc. may be used in combination.

Substances that form silver halides include inorganic halides, halogen-containing metal complexes, onium halides, halogenated hydrocarbons, N-halogen compounds, and more specifically, JP-A No. 51-22431, 50-7831
6, No. 50-115027, and No. 51-9813 can be used.

Examples of organic silver salts include organic acid silver and triazole silver salts, as described in "Basics of Photographic Optics, Non-Silver Salt Edition," P247J, and JP-A-59
Organic silver salts described in JP-A-55429 and the like can be used, and it is preferable to use silver salts with low photosensitivity.

Specifically, they are silver salts with aliphatic carboxylic acids, aromatic carboxylic acids, thiocarbonyl group compounds having a mercabuto group or α-hydrogen, and imino group-containing compounds.

Examples of aliphatic carboxylic acids include acetic acid, butyric acid, succinic acid,
These include sebacic acid, adivic acid, oleic acid, linoleic acid, linolenic acid, tartaric acid, palmitic acid, stearic acid, behenic acid, and camphoric acid, but in general, the fewer carbons there are, the more unstable the silver salt is. One with an appropriate number of carbon atoms is preferable.

Examples of aromatic carboxylic acids include benzoic acid derivatives, quinolinic acid derivatives, naphthalenecarboxylic acid derivatives, salicylic acid derivatives, gallic acid, tannic acid, phthalic acid, phenylacetic acid derivatives, biromellitic acid, and the like.

As a mercabuto group or a thiocarbonyl group compound having α-hydrogen, 3-mercabuto-4-phenyl-1,2
．． 4-triazole, 2-mercabutobenzimidazole, 2-mercabuto-5-aminothiadiazole, 2
-Merkabutobenzothiazole, S-alkylthioglycolic acid (alkyl group having 12 to 22 carbon atoms), dithiocarboxylic acids such as dithioacetic acid, thioamides such as thiostearamide, 5-carboxy-1-methyl-2-phenyl-4-thiopyridine , mercabutotriazine, 2-mercabutobenzoxazole, mercabutoxadiazole or 3-amino-5-pendylthio-1.2.4-
}Merkabut compounds described in US Pat. No. 4,123,274, such as lyazole, can be mentioned.

As a compound containing an imino group, Japanese Patent Publication No. 44-30
Penzotriazole or its derivatives described in No. 270 or No. 45-18416, such as penzotriazole, alkyl-substituted penzotriazoles such as methylbenzotriazole, 5-chlorobenzotriazole etc., halogen-substituted penzotriazoles, butylcarboimide Carboimide benzotriazoles such as benzotriazole,
Nitrobenzotriazoles described in JP-A No. 58-118639, sulfobenzotriazole, carboxybenzotriazole or a salt thereof, or hydroxybenzotriazole described in JP-A-58-115638, etc.
1 described in U.S. Pat. No. 4,220,709. 2.
Representative examples include 4-triazole, IH-tetrazole, carbazole, saccharin, imidazole and derivatives thereof. The reducing agents contained in the photoreceptor of the present invention include those having a chemical polymerization inhibiting effect and those having an optical polymerization inhibiting effect. Examples of the former reducing agent include naphthols, hydroxy polynuclear heteroaromatics, There are orthobisphenols, specifically 1,4-dihydroxynaphthalene, 4
-methoxy-1-naphthol, 4-ethoxy-1-naphthol, 5-methyl-4-methoxy-1-naphthol,
1.5-dihydroxynaphthalene, 4-chloro-1-naphthol, 5-chloro-1-naphthol, 4-methylthio-1-naphthol, 4-ethylthio-1-naphthol, 6-phenyl-4-methyl-1-naphthol, 6 -Phenyl-4-methoxy-1-naphthol, 6-penzyl-1-naphthol, 6-benzyl-4-methoxy-1-
Naphthol, 4-methyl-1,7-dihydroxynaphthalene, 4-methoxy-6-cyclohexyl-1-naphthol, 4-methylthio-6-cyclohexyl-1-naphthol, 3,4-dimethyl-1-naphthol, 4-pendyloxy l-naphthol, 8-hydroxyquinoline,
4.8-dihydroxyquinoline-2-carboxylic acid, 4-
Hydroxyquinoline-2-carboxylic acid, 4-methyl-8
-Hydroxyquinoline, 4-benzyl-8-hydroxyquinoline, 4.8-dihydroxy-5-methylquinoline, 2.2゛-methylenebis(6-t-butyldihydroxybenzene), 2.2゛-methylenebis(4-methoxyphenol) ), 2.2゛-methylenebis(4.6-di-t-butylphenol), 2.2゛-methylenebis
(4-methyl-6-t-butylphenol), 2.2゛-butylidenebis(4-methoxyphenol), 2,
2゛-butylidenebis(6-t-butyl-1,4-dihydroxymenzene), 2,2゜-thiobis(4-methoxyphenol), 2.2゜-thiobis(6-methyl-1,4-dihydroxybenzene) ), 2,2゛-thiobis(4,6-di-t-butylphenol), bis(2-
Hydroxy-5-methylphenyl)phenylmethane, (
3-t-butyl-5-methyl-2-hydroxyphenyl)
(5-methoxy-2-hydroxyphphenyl)methane and the like.

Examples of the latter reducing agent include methylenebis-p-phenols, triphenylmethanes, and bisnaphthols, specifically methylenebis(2,6-dimethylphenol), methylenebis(2,6-di-t-butylphenol ), penzylidene bis(2,6-di-t-butylphenol), tris(3,5-di-t-butyl-4-
hydroxyphenyl)methane, 4,4°-methylenebis(2-methyl-1-naphthol), 4,4°-methylenebis(2-ethyl=1-naphthol), 4,4'-benzylidenebis(2-methyl-1) - naphthol), etc.

Furthermore, two or more of the above-mentioned reducing agents can be used in combination.

As the polymerizable polymer precursor contained in the present invention, compounds having at least one reactive vinyl group in one molecule can be used. For example, reactive vinyl group-containing monomers,
One or more types selected from the group consisting of reactive vinyl group-containing oligomers and reactive vinyl group-containing polymers can be used.

The reactive vinyl groups of these compounds include styrene vinyl groups, vinyl acrylate groups, vinyl methacrylate groups, allyl vinyl groups, vinyl ethers, and ester vinyl groups such as vinyl acetate, which have polymerization reactivity. Examples include substituted or unsubstituted vinyl groups.

Specific examples of polymerizable polymer precursors that satisfy these conditions are as follows.

For example, styrene, methylstyrene, chlorstyrene, promostyrene, methoxystyrene, dimethylaminostyrene, cyanostyrene, nitrostyrene, hydroxystyrene, aminostyrene, carboxystyrene, acrylic acid, methyl acrylate, ethyl acrylate, cyclohexyl acrylate. , acrylamide, methacrylic acid, methyl methacrylate, ethyl methacrylate, probyl methacrylate, butyl methacrylate, phenyl methacrylate, cyclohexyl methacrylate, vinylpyridine,
N-vinylpyrrolidone, N-vinylimidazole, 2-
Monovalent monomers such as vinyl imidazole, N-methyl-2-vinylimidazole, probyl vinyl ether, butyl vinyl ether, isobutyl vinyl ether, β-chloroethyl vinyl ether, phenyl vinyl ether, p-methylphenyl vinyl ether, p-chlorophenyl vinyl ether : For example, divinylbenzene, distyryl oxalate, distyryl malonate, distyryl succinate, distyryl glutarate, distyryl adipate, distyryl maleate, distyryl fumarate, β, β゛-
Distyryl dimethylglutarate, distyryl 2-bromoglutarate, α. α゜-Distyryl dichloroglutarate, distyryl terephthalate, di(ethyl acrylate) oxalate, di(methyl ethyl acrylate) oxalate,
Malonic acid di(ethyl acrylate), malonic acid di(methyl ethyl acrylate), succinic acid di(ethyl acrylate), glutaric acid di(ethyl acrylate), adipic acid di(ethyl acrylate), maleic acid di(ethyl acrylate), fumaric acid acid di(ethyl acrylate),
β. β-dimethylglutaric acid di(ethyl acrylate), ethylene diacrylamide, brobylene diacrylamide, 1.4-phenyl diacrylamide, 1.4
-phenylene bis(oxyethyl acrylate), 1
．． 4-phenylenebis(acryloyloxyethoxy), 1,4-bis(acryloyloxyethoxy)
Cyclohexane, 1.4-bis(acryloyloxymethylethoxy)cyclohexane, 1.4-bis(acryloyloxyethoxycarbamoyl)benzene, 1.
4-bis(acryloyloxymethylethoxycarbamoyl)benzene, 1,4-bis(acryloyloxyethoxycarbamoyl)cyclohexane, bis(acryloyloxyethoxycarbamoylcyclohexyl)methane, di(ethyl methacrylate) oxalate, di(methylethyl oxalate) methacrylate), di(ethyl methacrylate) malonate, di(methyl ethyl methacrylate) malonate, di(ethyl methacrylate) succinate, di(methyl ethyl methacrylate) succinate, di(ethyl methacrylate) glutarate, di(ethyl adibate) methacrylate), maleic acid di(ethyl methacrylate)
, fumaric acid di(ethyl methacrylate), fumaric acid di(
methyl ethyl methacrylate), β,β'-dimethylglutaric acid di(ethyl methacrylate), 1,4-phenylene bis(oxyethyl methacrylate), 1,4-bis(methacryloyloxyethoxy)cyclohexane acryloyloxyethoxyethyl vinyl ether Divalent monomers such as bentaerythritol triacrylate, pentaerythritol trimethacrylate, pentaerythritol tri(hydroxystyrene), diventaerythritol hexaacrylate, cyanuric acid triacrylate, cyanuric acid trimethacrylate, l,
1. 1-trimethylolpropane tri7acrylate, 1, 1. 1- Trimethylolpropane trimethacrylate, cyanuric acid tri(ethyl acrylate)
, 1,1.1-trimethylolpropane tri(ethyl acrylate), cyanuric acid tri(ethyl vinyl ether), condensate of 1,1,I-trimethylolpropane tri(toluene diisocyanate) and hydroxyethyl acrylate, 1,1 .Trivalent monomers such as a condensate of 1-trimethylolpropane tri(hexane diisocyanate) and p-hydroxystyrene; for example, tetravalent monomers such as ethylenetetraacrylamide and brobylenetetraacrylamide; , oligomers or polymers with reactive vinyl groups left at their ends, or oligomers or polymers with reactive vinyl groups attached to their side chains can also be mentioned as polymerizable polymer precursors. Note that, as described above, two or more of these polymerizable polymer precursors may be used.

Next, examples of the polymerization initiator used in the present invention include photopolymerization initiators, such as carbonyl compounds, sulfur compounds, halogen compounds, and redox photopolymerization initiators.

Specifically, carbonyl compounds include diketones such as benzyl, 4.4°-dimethoxybenzyl, diacetyl, and camphorquinone; penzophenones such as 4,4°-diethylaminobenzophenone and 4.4'-dimethoxybenzophenone; Acetophenones such as acetophenone and 4°-methoxyacetophenone; Benzoin alkyl ethers; Thioxanthone such as 2-cyclothioxanthone, 2,5-diethylthioxanthone, and thioxanthone-3-carboxylic acid monoβ-methoxyethyl ester; Chalcones and styryl ketones having a dialkylamino group: 3.
3゜-carbonylbis(7-methoxycoumarin), 3.
3゜-carbonylbis(7-diethylaminocoumarin)
Examples include coumarins such as.

Examples of the sulfur compound include dibenzothiazolyl sulfide, decylphenyl sulfide, and disulfides.

Examples of halogen compounds include carbon tetrabromide, quinolinesulfonyl chloride, and S-
Examples include triazines.

Redox-based photopolymerization initiators include those used in combination with trivalent iron ion compounds (e.g. ferric ammonium citrate) and peroxide, and those used in combination with photoreducible dyes such as riboflavin and methylene blue and triethanolamine. , those using a combination of reducing agents such as ascorbic acid, and the like.

Furthermore, among the photopolymerization initiators described above, two or more types can be combined to achieve more efficient photopolymerization. Examples of such a combination of photopolymerization initiators include a combination of chalcone, styryl ketones, or coumarins having a dialkylamino group, and s-triazines or camphorquinone having a trioctamethyl group.

The reactive heat-diffusible dye contained in the photoreceptor of the present invention includes, for example, a heat-diffusible dye having a reactive group such as allyl, methallyl, acrylic, methacryl, and styryl, among which those having an acrylic or methacrylic group. is preferred.

Moreover, it may be colored or colorless.

Examples of colored reactive heat-diffusible dyes include monoazo dyes, thiazoleazo dyes, anthraquinone dyes, triallylmethane dyes, rhodamine dyes, naphthol dyes,
Examples include triarylmethane dyes. Examples of colorless reactive heat-diffusible dyes include stilbene dyes, leuco auramine dyes, phenazine dyes, astrazone dyes, reduced forms of auramine, and fluoran dyes.

In general, the smaller the molecular weight of these reactive heat-diffusible dyes, the greater their heat-diffusivity;
A dye having more polar groups such as an amino group, a hydroxyl group, a nitro group, or a sulfone group has a lower thermal diffusivity. Therefore, depending on the crosslinking density and heating conditions of the photoreceptor of the present invention, a dye having a desired thermal diffusivity may be appropriately selected based on the molecular weight and functional group. In addition, a non-reactive heat-diffusible dye may be used in combination.

Zinc oxide, calcium sulfate, novolak-type resin, zinc 3,5-di-1-butylsalicylate, etc. are used as a color developer in the image-receiving layer to exhibit color by reacting with the colorless reactive heat-diffusible dye. be able to.

In addition to these photosensitive silver salts and reducing agents, if necessary,
For example, binders, toning agents, chain transfer agents, antifoggants, discoloration inhibitors, solid solvents, surfactants, antistatic agents, and the like may be added.

The binder that can be used in the present invention can be selected from a wide range of resins, and specific examples include nitrocellulose, cellulose phosphate, cellulose sulfate, cellulose acetate, cellulose blobionate, cellulose butyrate, cellulose myristate. , cellulose valmitate,
Cellulose esters such as cellulose acetate/brobionate, cellulose acetate/butyrate; cellulose ethers such as methylcellulose, ethylcellulose, proylcellulose, butylcellulose; such as boristyrene, polyvinyl chloride, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, Vinyl resins such as polyvinyl alcohol and polyvinylpyrrolidone; copolymer resins such as styrene-butadiene copolymer, styrene-acrylonitrile copolymer, styrene-butadiene-acrylonitrile copolymer, vinyl chloride-vinyl acetate copolymer; for example, polymethyl methacrylate, polymethyl acrylate, polybutyl acrylate,
Acrylic resins such as polyacrylic acid, polymethacrylic acid, polyacrylamide, and polyacrylonitrile; Polyesters such as polyethylene terephthalate;
For example, poly(4,4-isobropylidene, diphenylene-co-1,4-cyclohexylene dimethylene carbonate), poly(ethylenedioxy-3.3°-phenylenethiocarbonate), poly(4,4°-isobropylidene diphenylene carbonate). Netocote terephthalate)
, poly(4.4°-isobropylidene diphenylene carbonate), poly(4.4°-sec-butylidene diphenylene carbonate), poly(4.4°-isobropylidene diphenylene carbonate block-oxyethylene), etc. Polyacrylate resins; polyamides; polyimides; epoxy resins; phenolic resins;
Examples include polyolefins such as polyethylene, polypropylene, and chlorinated polyethylene; and natural polymers such as gelatin.

A preferred blending ratio of the above-mentioned portions in the photoreceptor of the present invention is as follows.

Preferably, the amount of silver halide or a substance that forms silver halide is 0.00% per mole of organic silver salt. 001-2
It is desirable to contain it by mole, more preferably from 0.05 to 0.4 mole. Further, the reducing agent is preferably 0.05 to 3 mol, more preferably 0.2 to 3 mol, per mol of organic silver salt.
It is desirable to contain 1.3 mol. Furthermore, it is desirable to use a polymerization initiator preferably in an amount of 0.1 to 30 parts by weight, more preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the polymerizable polymer precursor.

In addition, the content of the heat-diffusible dye is the total amount of the polymerizable polymer precursor, polymerization initiator, and appropriately used binder.
It is desirable to use preferably 2.5 to 100 parts by weight, more preferably 5 to 50 parts by weight.

〔Example〕

Next, the present invention will be explained by examples.

X-Clan Yu A dispersion liquid having the following composition was prepared in a dark room.

Behenic acid 2.5 parts Silver henate 4.5 parts AgBr
0.7 parts polyvinyl butyral 1.5 parts polymethyl methacrylate 10.0 parts diventaerythritol hexaacrylate 10.0 parts ethyl 4-dimethylaminobenzoate 0.6 parts 2-chlorothioxanthone 0.4 parts 4-pendyloxy-1 - Naphthol 1.8 parts Reactive thermodiffusible dye 1-acrylamino-2-phenoxy 4-hydroxyanthraquinone 1.8 parts Xylene
60 parts n-butanol
60 A homomixer was used for partial dispersion. This is polyethylene terephthalate film (PET film)
The film was applied to a dry film thickness of 5 μm.

A polyvinyl alcohol layer (PVA layer) was applied to this to have a dry film thickness of 2 μm.

A negative image is superimposed on the photoconductor of the present invention thus produced, and 4
Using a fluorescent lamp with a fluorescence peak at 50 nm, imagewise exposure was performed for 10 seconds with the light source 5 cm away from the photoreceptor. Thereafter, the negative film was removed, and the photoreceptor was passed through a heat developing machine adjusted to 110° C. for 25 seconds. Furthermore, it was placed on a hot plate heated to 60°C, and using a fluorescent lamp with a fluorescence peak at 390 nm, the light source was placed 5 cm away from the photoreceptor.
The entire surface was exposed for 0 seconds.

Next, the PVA layer was removed by washing with water, synthetic paper with an image-receiving layer formed of polyester resin was used as image-receiving paper, and the photoreceptor and image-receiving layer were stacked so as to face each other, and heated at 100°C for 20 minutes.
Heat the PET film from the side under conditions of 2 seconds to diffusely transfer the heat-diffusible dye from the photoreceptor to the image-receiving layer to obtain a red color image corresponding to the exposed area of the image on the image-receiving paper, and also corresponding to the unexposed area of the image. The optical density of the area was as low as 0.08, and color fog was extremely low. In Example 1, 1.8 parts of l-acrylamino-2-phenoxy-4-hydroxyanthraquinone was added to 1.5 parts of
-Diamino-4.8-dihydroxy-2 or 3-promoanthraquinone to 1.8 parts of a mixture of diacrylic and monoacrylic bodies, 0.4 parts of 2-chlorothiol xanthone, and 0.35 parts of pendyl methyl ketal. A photoreceptor was produced in the same manner as in Example 1 except for the following changes.

After imagewise exposure and thermal development in the same manner as in Example 1, the film was placed on a hot plate heated to 80'C, and the entire surface was exposed to light from a fluorescent lamp having a fluorescence peak at 340 nm at a distance of 5 cm for 15 seconds. Next, after removing the PVA membrane by washing with water, the same image-receiving paper as in Example 1 was layered, and PET was
Heated from the film side. A blue color image corresponding to the exposed image area was obtained on the receiver paper. Further, the optical density of the portion corresponding to the unexposed portion of the image was as low as 0.07, and there was little color fog. Solutions A and B having the following compositions were prepared. Part A Polyvinyl butyral 20 parts Diventaerythritol hexaacrylate 15 parts 2-chlorothioxanthone 1.2 parts 4-dimethylaminobenzoate ethyl 2 parts Reactive thermodiffusible dye 2-acryloxyethoxycarbonyl-1-amino-4-p- Tolylaminoanthraquinone 4.5 parts Methyl ethyl ketone 150 parts B liquid behenic acid 3.0 parts Silver henate 4.5 parts AgBr
0.7 part polyvinyl butyral
IO part phthalazinone 0.
8 parts methylenebis(2.6-di-71butylphenol) 4.0 parts toluene 40 parts i-
Apply 80 parts of Probanol Solution A to a PET film to a dry film thickness of 3 μm.
An image forming layer was obtained. Next, liquid B was applied thereon to a dry film thickness of 4-4, thereby forming a photosensitive layer. A PET film was laminated on the photosensitive layer to obtain a photoreceptor.

After exposure from the photosensitive layer side through a mask in the same manner as in Example 1, heating at 120° C. for 10 seconds, the entire surface was exposed from the photosensitive layer side in the same manner as in Example 1.

Next, the photosensitive layer was peeled off together with the laminated PET film, and the image forming layer was placed on the image receiving paper and heated at 100° C. for 20 seconds, whereby a cyan image corresponding to the exposed area of the image was obtained on the image receiving paper. [Effects of the Invention] As explained above, the photoreceptor of the present invention can form color images with less color fog.

Claims (1)

[Claims] 1. A silver halide or a silver halide-forming substance, an organic silver salt, a reducing agent, a polymerizable polymer precursor, a polymerization initiator, and a reactive heat-diffusible dye. Photoreceptor. 2. A polymerizable polymer precursor and a reactive heat-diffusible dye are reacted on the photoreceptor according to claim 1 in accordance with image information, and the reactive heat-diffusible dye is transferred to image-receiving paper in accordance with the degree of reaction. An image forming method characterized by: