JPH0627653A - Photosensitive material and image forming method using the same - Google Patents

Abstract

PURPOSE:To form a high contrast image excellent, in transparency with a monosheet type photosensitive material utilizing a color development reaction. CONSTITUTION:Silver halide, a reducing agent, a polymerizable compd., a thermoplastic substance and two kinds of substances causing a color development reaction in a contact state are held on a substrate, one of the substances causing a color development reaction is housed in microcapsules and the other is housed in the outside of the microcapsules to obtain a photosensitive material. At this time, the thermoplastic substance is contained in a microcapsule-contg. layer at the outside of the microcapsules or a layer contg. the thermoplastic substance is formed besides the microcapsule-contg. layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming method using a monosheet type light-sensitive material capable of forming a color image on a light-sensitive material.

[0002]

2. Description of the Related Art A light-sensitive material having a light-sensitive layer containing a silver halide, a reducing agent, and a polymerizable compound on a support causes a latent image to be formed on the silver halide, and the polymerizable compound is polymerized correspondingly. The image forming method can be used. An example of this image forming method is Japanese Patent Publication No. 45-111149.
No. 47-20741, No. 49-10697, JP-A No. 57-138632, No. 57-142638,
57-176033, 57-21146, 58-107529, 58-121031, 5;
No. 8-169143. These methods form an image-like polymer compound by polymerizing a coexisting polymerizable compound (eg, vinyl compound) when developing exposed silver halide using a developing solution. . Therefore, the above method requires a development process using a liquid, and the process requires a relatively long time.

As an improvement of the above method, Japanese Patent Laid-Open No. 61-69
062, 61-73145, 61-18364.
No. 0, No. 61-188535, No. 61-228441
Each of the publications describes a method capable of forming a polymer compound by a dry treatment. The above method uses a recording material (photosensitive material) in which a photosensitive layer comprising a photosensitive silver salt (silver halide), a reducing agent, a crosslinkable compound (polymerizable compound) and a binder is carried on a support. is there.
The above-mentioned image forming method is a method of polymerizing the polymerizable compound in the part where the latent image of silver halide is formed.

Further, a method of polymerizing a polymerizable compound in a portion where a latent image of silver halide is not formed is disclosed in JP-A-61 / 1986.
-183641, 61-260241, 62-
70836, 62-81635, JP-A 2-14
No. 1756, No. 2-141757, No. 2-20725
No. 4 and No. 2-262662.

As one embodiment of a light-sensitive material that can be used in the above-described image forming method, a light-sensitive material having a structure in which a silver halide and a polymerizable compound are contained in microcapsules is disclosed in JP-A-61-275742. Have been described. The light-sensitive material using the above-mentioned microcapsules (hereinafter, referred to as photosensitive microcapsules) has an advantage that a clear image, particularly excellent in sharpness can be obtained. On the other hand, the development and the polymerization reaction in the above image forming method proceed smoothly under alkaline conditions. Therefore, it is preferable to include a base or a base precursor as an image formation accelerator in the photosensitive layer of the photosensitive material. For a light-sensitive material characterized in that the light-sensitive layer contains a base or a base precursor, see JP-A-62-1640.
No. 41 specification.

When the base or the base precursor is added to the light-sensitive material using the above-mentioned photosensitive microcapsules, it is necessary to store the base or the base precursor in the photosensitive microcapsules because of the function of promoting the image formation of the base or the base precursor. It is preferable in terms. Japanese Unexamined Patent Publication No. 64-322
No. 51, Japanese Patent Application Laid-Open No. 1-263641, Japanese Patent Application No. 1-1
No. 82245, Japanese Patent Application No. 1-160148 and the specification describe a photosensitive material using a photosensitive microcapsule characterized by containing a base or a base precursor in its content.

As an image forming method using a photosensitive material using these photosensitive microcapsules, a method of transferring an image on the photosensitive material to an image receiving material is generally used. On the other hand, in the above-mentioned transfer type image forming method, there is a problem such as disposal of the photosensitive material after transfer, and therefore it has been desired to form a monosheet. JP-A-62-209444 and JP-A-63-
No. 261,348 describes a monosheet type photosensitive material in which a photosensitive material and an image receiving material are integrated. In these light-sensitive materials, the color-forming material is released by breaking the microcapsules to obtain an image. However, with these mono-sheet type light-sensitive materials, the glossiness of the image cannot be sufficiently obtained, and the transmission image (in this case, a transparent support is used)
It was unsuitable as a light-sensitive material for OHP (overhead projector) or medical (for X-ray, ultrasonic diagnosis, etc.) because it lacks transparency when obtaining

[0008]

DISCLOSURE OF THE INVENTION The present invention uses a monosheet type light-sensitive material utilizing a color-developing reaction to obtain a transmitted image having high contrast and excellent transparency.
It is an object of the present invention to provide a light-sensitive material capable of obtaining a glossy reflection image. Still another object is to provide a light-sensitive material having a high image density.

[0009]

The above objects have been achieved by a monosheet type photosensitive material and an image forming method using the same as described below.

(Photosensitive material) A silver halide, a reducing agent, a polymerizable compound, a thermoplastic substance, and two kinds of substances that cause a color-forming reaction in a contact state on a support, and one of the substances that cause the color-forming reaction. In a light-sensitive material in which the above substance and the above polymerizable compound are contained in microcapsules and the other one that causes a color reaction is contained outside the microcapsules, a thermoplastic substance is contained outside the microcapsules in the microcapsule-containing layer. Or a layer containing a thermoplastic substance in addition to the layer containing microcapsules.

(Image forming method) The above light-sensitive material is subjected to a development treatment simultaneously with or after the imagewise exposure, and then an uncured polymerizable compound is contained by using a means such as a pressure roller. At the same time as destroying the microcapsule, or
After that, the image forming method is characterized by heating while applying pressure.

The features of the present invention are, as apparent from the above,
A thermoplastic substance, preferably a thermoplastic polymer, is used on the light-sensitive material, and at the end of the image forming process, the image is provided with glossiness or transparency by heating under pressure.

Typical examples of the thermoplastic material used in the present invention are shown below, but their softening points are from 10 ° C to 200 ° C.
Is preferable, and 60 ° C. to 160 ° C. is more preferable. Typical specific examples include general thermoplastic polymers, polyethylene (preferably amorphous), ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ionomer, ethylene-acrylic ester copolymer, Ethylene-methacrylic ester copolymer, polypropylene (preferably amorphous), polystyrene, poly α-methylstyrene, α-methylstyrene-
Vinyltoluene copolymer, styrene-butadiene copolymer, styrene-methylmethacrylate copolymer, styrene-methacrylic acid copolymer, styrene-acrylonitrile copolymer, styrene-acrylate copolymer, polymethylacrylate, polymethylmethacrylate , Polyethyl acrylate, polyethyl methacrylate, polybutyl acrylate, polybutyl methacrylate, methyl methacrylate-methacrylate copolymer, 2-ethylhexyl acrylate-methacrylate copolymer, ethyl acrylate-acrylic acid copolymer, methyl methacrylate-methacrylic acid copolymer Combined, polyvinyl acetate, vinyl acetate-vinyl chloride copolymer, polyvinyl chloride, polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-a Rironitoriru copolymers, polyacrylonitrile, polyamides, polyesters, polyvinyl butyral, polyvinyl formal, polyurethane, ethyl cellulose, a cellulose acetate or the like.

As the low molecular weight thermoplastic resin, those used in hot melt type adhesives can be used. Rosin and rosin modified resin, hydrogenated rosin, styrene modified polyterpene resin, styrene modified petroleum resin, petroleum-based Unsaturated hydrocarbon, styrene resin, terpene-phenol,
Examples thereof include aliphatic hydrocarbon resins, cyclopentadiene resins, modified phenol resins, alkylphenol resins and alkylphenol-acetylene resins.

Each of the above-mentioned thermoplastics is used alone or
You may use it in combination of 2 or more type. The present invention is not limited to the above as long as it has thermoplasticity. In the light-sensitive material of the present invention, the above-mentioned thermoplastic substance is provided in the form of fine particles in the light-sensitive layer (however, outside the light-sensitive microcapsules) or in the upper or lower layer of the light-sensitive layer. or,
The thermoplastic material may be applied under the photosensitive layer in the form of a uniform polymer layer. Either method is effective for making images transparent and glossy.

The silver halide, reducing agent, polymerizable compound, color image forming substance, microcapsule, support and other components used in the light-sensitive material for image formation of the present invention will be described below. In the light-sensitive material of the present invention, as silver halide, any grains of silver chloride, silver bromide, silver iodide or silver chlorobromide, silver chloroiodide, silver iodobromide and silver chloroiodobromide are used. be able to. The silver halide grains in the photographic emulsion have regular crystals such as cubes, octahedra, dodecahedrons and tetradecahedrons, grains having an irregular crystal system such as spheres and plates. It may have a crystal defect such as a twin plane or a composite form thereof. The grain size of silver halide is about 0.01 micron or less, but the projected area diameter is about 1
Large grains up to 0 micron may be used, and polydisperse emulsions may also be used in US Pat. Nos. 3,574,628 and 3,574.
655,394 and British Patent 1,413,748.
The monodisperse emulsions described in the publications may be used.

Further, tabular grains having an aspect ratio of about 5 or more can be used in the present invention. Tabular grains are described in Gutoff, Photographic Science and Engineering.
Engineering), Vol. 14, pp. 248-257 (1970)
); U.S. Pat. Nos. 4,434,226 and 4,41
4,310, 4,433,048, 4,43
It can be easily prepared by the method described in 9,520 and British Patent No. 2,112,157. The crystal structure may be uniform, may have different halogen compositions inside and outside, or may have a layered structure. Further, silver halides having different compositions may be joined by epitaxial joining, or may be joined with a compound other than silver halide such as silver rhodanide and lead oxide. Further, two or more kinds of silver halide grains having different halogen compositions, crystal habits, grain sizes and the like can be used in combination.

The silver halide photographic emulsion which can be used in the present invention is, for example, Research Disclosure (RD) No.
17643 (December 1978), pp. 22-23,
"I. Emulsion preparation and types"
, And ibid. 18716 (November 1979), 6
It can be prepared using the method described on page 48 and the like. As the silver halide emulsion, those which are physically ripened, chemically ripened and spectrally sensitized are usually used. Additives used in such a process are described in Research Disclosure No. 17643 and No. 18716, and the corresponding portions are summarized in the table below. Known photographic additives that can be used in the present invention are also the above-mentioned two research products.
It is described in the disclosure, and the relevant parts are shown in the table below.

Additive type RD17643 RD18716 Chemical sensitizer, page 23, page 648, right column Sensitivity enhancer, same as above Spectral sensitizer, page 23-24, page 648, right column-Supersensitizer, page 649, right column, antifoggant 24- See page 25, page 649, right column and stabilizers. For details of the above silver halide emulsion and photographic additives, refer to "Public Technology No. 5" (Aztec Co., Ltd.,
(Published March 22, 1991) 2 to 17 pages. The amount of silver halide used is 0.001 to 10 g, preferably 0.05 to ² g, in terms of silver per 1 m ² of the light-sensitive material. Further, in the present invention, an organic silver salt can be used together with silver halide. The organic silver salt is described on pages 17 to 18 of "Public Technology No. 5" mentioned above.

The reducing agent which can be used in the light-sensitive material of the present invention has a function of reducing silver halide and / or a function of accelerating (or suppressing) the polymerization of the polymerizable compound. Examples of the reducing agent having the above function include hydroquinones, catechols, p-aminophenols, p-phenylenediamines, 3-pyrazolidones, 3-aminopyrazoles, 4-amino-5-pyrazolones and 5-amino. Uracils, 4,5-dihydroxy-6-aminopyrimidines, reductones, aminoreductones, o-
Or p-sulfonamidophenols, o- or p
-Sulfonamidonaphthols, 2,4-disulfonamidophenols, 2,4-disulfonamidonaphthols, o- or p-acylaminophenols, 2-
Sulfonamide indanones, 4-sulfonamido-5
-Pyrazolones, 3-sulfonamidoindoles, sulfonamidepyrazolobenzimidazoles, sulfonamidepyrazolotriazoles, α-sulfonamidoketones, hydrazines and the like. The various reducing agents described above are described in detail on pages 18 to 35 of the above-mentioned "Known Technology No. 5". The addition amount of the reducing agent can be widely varied, but it is generally 0.1 to 1500 mol%, preferably 10 to 300 mol% with respect to the silver salt.

The polymerizable compound used in the light-sensitive material is generally a compound having addition polymerization or ring-opening polymerization. The compound having an addition-polymerizable group includes a compound having an ethylenically unsaturated group, and the compound having a ring-opening polymerizable group includes a compound having an epoxy group. A compound having an ethylenically unsaturated group is particularly preferable. The compound having an ethylenically unsaturated group that can be used in the light-sensitive material, acrylic acid and its salts, acrylic acid esters,
Acrylamides, methacrylic acid and its salts, methacrylic acid esters, methacrylamides, maleic anhydride, maleic acid esters, itaconic acid esters, styrenes, vinyl ethers, vinyl esters, N-
Examples include vinyl heterocycles, allyl ethers, allyl esters and their derivatives.

Specific examples of preferable polymerizable compounds that can be used in the light-sensitive material include acrylic acid esters, such as n-butyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, benzyl acrylate, furfuryl acrylate, ethoxyethoxyethyl. Acrylate, tricyclodecanyloxy acrylate, nonylphenyloxyethyl acrylate, 1,3-dioxolane acrylate, hexanediol diacrylate, butanediol diacrylate,
Neopentyl glycol diacrylate, tricyclodecane dimethylol diacrylate, trimethylol propane triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, polyoxyethylenated bisphenol A diacrylate,
2- (2-hydroxy-1,1-dimethylethyl) -5
-Hydroxymethyl-5-ethyl-1,3-dioxane acrylate, 2- (2-hydroxy-1,1-dimethylethyl) -5,5-dihydroxymethyl-1,3-dioxane triacrylate, propylene of trimethylolpropane Examples thereof include triacrylate of an oxide adduct, hexaacrylate of a caprolactone adduct of dipentaerythritol, polyacrylate of hydroxypolyether, polyester acrylate and polyurethane acrylate.

As other specific examples, regarding methacrylic acid esters, methyl methacrylate, butyl methacrylate, ethylene glycol dimethacrylate, butanediol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, pentaerythritol trimethacrylate,
Examples thereof include pentaerythritol tetramethacrylate and dioxymethacrylate of polyoxyalkylenated bisphenol A.

The above polymerizable compounds may be used alone or in combination of two or more kinds. Regarding a light-sensitive material in which two or more kinds of polymerizable compounds are used in combination, see JP-A-62-210445.
It is described in the official gazette. A substance obtained by introducing a polymerizable functional group such as a vinyl group or a vinylidene group into the chemical structure of the reducing agent described above can also be used as the polymerizable compound.

Next, two kinds of substances (called color image forming substances) which cause a color reaction in the contact state used in the present invention will be explained. As the color image forming substance, there is used a substance which is colorless or light in itself but develops a color by coming into contact with another component. Examples include various systems that develop a color by an acid-base reaction between two or more components, a redox reaction, a coupling reaction, a chelate forming reaction and the like.

For example, a color-developing system comprising a color-forming agent having a partial structure such as lactone, lactam and spiropyran used for pressure-sensitive paper and an acidic substance (developing agent) such as acid clay or phenol; aromatic diazonium salt System utilizing azo coupling reaction of azo, diazotate, diazosulfonates with naphthols, anilines, active methylenes; reaction of hexamethylenetetramine with ferric ion and gallic acid and phenolphthalein-complexones A chelate-forming reaction such as a reaction between a ferric stearate and pyrogallol or a redox reaction such as a reaction between ferric stearate and pyrogallol or a reaction between silver behenate and 4-methoxy-1-naphthol can be used.

Also, as another example of the system in which the color is developed by the reaction between the two components, the case where this reaction proceeds by heating is known. In this case, it is necessary to heat the two components at the same time when the two components are mixed by breaking the microcapsules during pressurization or immediately after pressurization.

Examples of the color-developing agent in the color-developing agent / developing agent system include (1) triarylmethane-based compounds, (2) diphenylmethane-based compounds, (3) xanthene-based compounds, (4) thiazine-based compounds, and (5) spiropyran-based compounds. There are, for example, those described in JP-A-55-27253 and the like.

Among them, (1) triarylmethane-based and (3) xanthene-based color formers are preferable because many are less fogged and give high color density. Specific examples include crystal violet lactone, 3-diethylamino-6-chloro-7- (β-ethoxyethylamino) fluorane,
3-diethylamino-6-methyl-7-anilinofluorane, 3-triethylamino-6-methyl-7-anilinofluorane, 3-cyclohexylmethylamino-6-
There are methyl-7-anilinofluorane, 3-diethylamino-7-o-chloroanilinofluorane and the like, and these may be used alone or in combination.

As the color developer, a phenolic compound, an organic acid or a metal salt thereof, an oxybenzoic acid ester, acid clay, etc. are used.

An example of a phenol compound is 4,4 '.
-Isopropylidene-diphenol (bisphenol A), p-tert-butylphenol, 2,4-dinitrophenol, 3,4-dichlorophenol, 4,4'-
Methylene-bis (2,6-di-tert-butylphenol), p-phenylphenol, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (4
-Hydroxyphenyl) -2-ethylhexane, 2,2
-Bis (4-hydroxyphenyl) butane, 2,2'-
Methylenebis (4-tert-butylphenol), 2,
2'-methylenebis (α-phenyl-p-cresol)
Thiodiphenol, 4,4′-thiobis (6-tert-butyl-m-cresol) sulfonyldiphenol, p-tert-butylphenol-formalin condensate,
Examples include p-phenylphenol formalin condensate.

Examples of organic acids or metal salts thereof include phthalic acid, phthalic anhydride, maleic acid, benzoic acid, gallic acid, o-toluic acid, p-toluic acid, salicylic acid and 3
-Tert-butylsalicylic acid, 3,5-di-tert-butylsalicylic acid, 5-α-methylbenzylsalicylic acid, 3,
5- (α-methylbenzyl) salicylic acid, 3-tert-octylsalicylic acid and their zinc, lead, aluminum salt, magnesium salt, nickel salt and the like are useful. In particular, the salicylic acid derivative and its zinc salt or aluminum salt are excellent in terms of color developing ability, fastness of a color image, storability of a recording sheet and the like.

Examples of the oxybenzoic acid ester include ethyl p-oxybenzoate, butyl p-oxybenzoate and p-
Examples include heptyl oxybenzoate and benzyl p-oxybenzoate.

The present invention particularly preferably utilizes the color former / developer system described above. Other color formers / color developer systems include, for example, phenolphthalein, fluorescein, 2 ', 4', 5 ', 7'-tetrabromo-3,4,5,6-tetrachlorofluorescein. In, tetrabromophenol blue, 4, 5, 6, 7
-Tetrabromophenolphthalein, eosin, aurincresol red, 2-naphtholphenolphthalein and the like.

As the color developer, inorganic and organic ammonium salts, organic amines, amides, urea and thiourea and their derivatives, thiazoles, pyrroles, pyrimidines,
Examples thereof include nitrogen-containing compounds such as piperazines, guanidines, indoles, imidazoles, imidazolines, triazoles, morpholines, piperidines, amidines, formazines and pyridines.

Specific examples thereof include ammonium acetate, tricyclohexylamine, tribenzylamine, octadecylbenzylamine, stearylamine, allylurea, thiourea, methylthiourea, allylthiourea, ethylenethiourea, 2-benzylimidazole, 4 -Phenylimidazole, 2-phenyl-4-methyl-imidazole, 2-undecyl-imidazoline,
2,4,5-Trifuryl-2-imidazoline, 1,2-
Diphenyl-4,4-dimethyl-2-imidazoline, 2
-Phenyl-2-imidazoline, 1,2,3-triphenylguanidine, 1,2-ditolylguanidine, 1,2
-Dicyclohexylguanidine, 1,2-dicyclohexyl-3-phenylguanidine, 1,2,3-tricyclohexylguanidine, guanidine trichloroacetate,
There are N, N'-dibenzylpiperazine, 4,4'-dithiomorpholine, morpholinium trichloroacetate, 2-amino-benzothiazole, 2-benzoylhydrazino-benzothiazole.

The color image-forming substance of the present invention is used in an amount of 0.5 to 100 parts by weight, particularly preferably 10 to 50 parts by weight, based on 100 parts by weight of the polymerizable compound. The color developer is used in a proportion of about 0.3 to 50 parts by weight with respect to 1 part by weight of the color developing agent. When forming a full-color image,
A plurality of color development systems as described above may be used. In this case, a full-color image can be formed by combining at least three kinds of silver halide emulsions having photosensitivities in mutually different spectral regions and using a color forming agent corresponding to each emulsion for each microcapsule. The substance that causes a color reaction outside the microcapsules may be a layer different from the layer containing the microcapsules.

Next, in the light-sensitive material of the present invention, a base precursor can be used as an image formation accelerator. The base precursor that can be used in the light-sensitive material of the present invention,
Base precursors of inorganic bases and organic bases (such as decarboxylation type, thermal decomposition type, reaction type and complex salt forming type) can be used. For details of these base precursors and techniques for using them, see "Public Technology No. 5", pp. 55-86.
Page.

Preferred base precursors are JP-A Nos. 59-180549, 59-180537, 59-195237, 61-32844 and 61.
-36743, 61-51140, 61-52.
No. 638, No. 61-52639, No. 61-53631.
No. 61-53634, No. 61-53635, No. 61-53636, No. 61-53637, No. 61-
53638, 61-53639, 61-536.
40, 61-55644, 61-55645.
No. 61, No. 61-55646, No. 61-84640, No. 61-107240, No. 61-2119950, No. 6
1-251840, 61-252544, 61
-313431, 63-316740, 64-
No. 68746 and Japanese Patent Application No. 1-54452, salts of organic acids and bases that are decarboxylated by heating.
Further, JP-A-59-157637 and JP-A-59-1669.
The compounds described in JP-A-43-63 and JP-A-63-96159, which eliminate a base by heating, can be mentioned.

The base precursor of the present invention is 50
It is preferable to release the base at ℃ to 200 ℃, 80
More preferably, the release is carried out at a temperature of 180 ° C to 180 ° C. Since the base precursor used in the light-sensitive material of the present invention is contained in microcapsules, it is disclosed in Japanese Patent Application No. 2-270159.
Particularly preferred are base precursors consisting of a salt of a carboxylic acid and an organic base having a solubility of 1% or less in water and a polymerizable compound at 25 ° C.

In the present invention, when the base precursor is contained in the microcapsules, a photosensitive composition in which the base precursor is directly solid-dispersed in a polymerizable compound may be used (Japanese Patent Application Laid-Open No. 64-32251). Kaihei 1-2
It is particularly preferable to use a photosensitive composition in which a base precursor is dispersed in water and emulsified in a polymerizable compound. (JP-A-63-21
No. 8964, Japanese Patent Application No. 1-182245, Japanese Patent Application No. 1-1
No. 60148 gazette and specification) Here, when dispersing the base precursor in water, it is preferable to use a nonionic or amphoteric water-soluble polymer.

Examples of nonionic water-soluble polymers are polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polymethyl vinyl ether, polyacryloylmorpholine, polyhydroxyethyl acrylate, polyhydroxyethyl methacrylate-co-acrylamide, hydroxyethyl cellulose, hydroxy. Examples thereof include propyl cellulose and methyl cellulose. Further, as the amphoteric water-soluble polymer,
Mention may be made of gelatin.

The above water-soluble polymer is preferably contained in the base precursor in a proportion of 0.1 to 100% by weight, more preferably 1 to 50% by weight. The base precursor is preferably contained in the dispersion in an amount of 5 to 60% by weight, more preferably 10 to 50% by weight. Further, the base precursor is preferably contained in a proportion of 2 to 50% by weight with respect to the polymerizable compound,
It is more preferable that the content is 5 to 30% by weight.

No particular limitation is imposed on the encapsulation method which can be used for the photosensitive microcapsules of the present invention, and various known techniques can be applied.
It is described in detail on pages 88 to 98. In the present invention, it is particularly preferable to use a melamine-formaldehyde resin, since a highly dense capsule can be obtained. Further, JP-A-2-216151 discloses a reaction product of a water-soluble polymer having a sulfinic acid group and a polymerizable compound having an ethylenically unsaturated group in order to obtain a capsule having particularly excellent wall compactness. A microcapsule in which a polymer wall of a high molecular compound such as melamine / formaldehyde resin is provided around the membrane is disclosed, which is preferable for the present invention.

When aminoaldehyde-based microcapsules are used, it is preferable that the amount of residual aldehyde is not more than a certain value as in the light-sensitive material described in JP-A-63-32535. The method is disclosed in JP-A-63-14.
No. 2343, etc.

When accommodating silver halide in the microcapsules, the average grain size of the silver halide grains described above is preferably not more than one fifth of the average size of the microcapsules, and preferably not more than one tenth. More preferably, By setting the average grain size of the silver halide grains to be one fifth or less of the average size of the microcapsules, a uniform and smooth image can be obtained.
When the silver halide is contained in the microcapsules, it is preferable that the silver halide be present in the wall material that constitutes the outer shell of the microcapsules. Regarding a light-sensitive material containing silver halide in the wall material of microcapsules, JP-A-62-62
No. 169147.

In the production of the photosensitive microcapsules of the present invention, one of the substances that cause a color-forming reaction and a polymerizable compound, and if necessary, an oily liquid containing a silver halide, a reducing agent, and a base precursor is used as an aqueous solution. When dispersed in a medium to form the outer shell of a capsule, the aqueous medium preferably contains a nonionic water-soluble polymer and an anionic water-soluble polymer. In this case, the oily liquid containing the polymerizable compound is preferably 10 to 120% by weight, more preferably 20 to 90% by weight, based on the aqueous medium.

Examples of nonionic water-soluble polymers are polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polymethyl vinyl ether, polyacryloylmorpholine, polyhydroxyethyl acrylate, polyhydroxyethyl methacrylate-co-acrylamide, hydroxyethyl cellulose, hydroxy. Examples thereof include propyl cellulose and methyl cellulose. Examples of the anionic water-soluble polymer include polystyrene sulfinic acid, copolymer of styrene sulfinate, polystyrene sulfonate, copolymer of styrene sulfonate, polyvinyl sulfate ester salt, polyvinyl sulfonate, maleic anhydride. -Styrene copolymers, maleic anhydride / inbutylene copolymers and the like can be mentioned. In this case, the concentration of the anionic water-soluble polymer in the aqueous medium is preferably 0.01 to 5% by weight, more preferably 0.1 to 2% by weight. In the above case, it is particularly preferable to use the nonionic water-soluble polymer in combination with the water-soluble polymer having a small amount of sulfinic acid groups.

In order to reduce the solubility of the base precursor in the polymerizable compound, polyethylene glycol, polypropylene glycol, benzoic acid amide, cyclohexylurea, octyl alcohol, dodecyl alcohol, stearyl alcohol, stearamide and the like are added to the polymerizable compound. OH, -SO ₂ NH _2, -CONH
_{It is} also possible to add a compound having a hydrophilic group such as ₂ , ₂ , -NHCONH ₂ .

In the present invention, in addition to the reducing agent, known antioxidants for preventing oxidative deterioration of the polymerizable compound and for preventing oxygen oxidation during heat development can be used together with the polymerizable compound. As such an antioxidant, 2,2 '
-Methylene-bis- (4-methyl-6-t-butylphenol), 2,6-di-t-butylphenol, 2,
2'-butylidene-bis- (4-methyl-6-t-butylphenol), 2-t-butyl-6- (3'-t-butyl-5'-methyl-2'-hydroxybenzyl) -4
-Methylphenyl acrylate, 4,4'-thio-bis- (3-methyl-6-t-butylphenol) and other phenolic antioxidants; diphenyldecyl phosphite,
Triphenyl phosphite, tris- (2,4-di-t
-Butylphenyl) phosphite, tris- (2-ethylhexyl) phosphite and other phosphite antioxidants; dilauryl-3,3'-thio-dipropionic acid ester, pentaerythritol-tetrakis- (β-lauryl-thio -Psupionate ester), thio-dipropionic acid and other sulfur-based antioxidants; phenyl-1-naphthylamine, 6-ethoxy-2,2,4-trimethyl-
Examples include amine antioxidants such as 1,2-dihydroquinoline and dioctyliminodibenzyl.

Materials usable for the support include glass, paper, woodfree paper, baryta paper, coated paper, cast coated paper, synthetic paper, metal and its analogues, polyester, polyethylene, polypropylene, acetyl cellulose, cellulose. Ester, polyvinyl acetal,
Examples thereof include films such as polystyrene, polycarbonate, polyethylene terephthalate, and polyimide, and paper laminated with a resin material or a polymer such as polyethylene. For details, refer to “Public Technology No. 5” above.
No. "pp. 144-149. When a transparent image is desired to be obtained by utilizing the present invention, for example, when it is used as a photosensitive material for OHP or medical (for X-ray, ultrasonic diagnosis, etc.), it is necessary to select a transparent support.

Other components that can be used in the light-sensitive material of the present invention will be described below. Details of these components are described in the above-mentioned "Known Technology No. 5", pp. 98-144 and 86-.
It is described on page 88. The binder that can be used in the light-sensitive material can be contained in the light-sensitive layer alone or in combination. It is preferable to mainly use a hydrophilic binder. As the hydrophilic binder, a transparent or translucent hydrophilic binder is typical. For example, natural substances such as gelatin, gelatin derivatives, cellulose derivatives, starch, gum arabic, etc., and polyvinyl alcohol, polyvinylpyrrolidone, acrylamide polymers, etc. Synthetic polymers such as water-soluble polyvinyl compounds. Other synthetic polymeric materials include dispersed polyvinyl compounds in the form of latices, which in particular increase the dimensional stability of photographic materials. The light-sensitive material using a binder is described in JP-A-61-69062. Further, regarding a light-sensitive material using a binder together with microcapsules, see JP-A-62-209525.
It is described in the official gazette.

Various image forming accelerators can be used in the light-sensitive material.

The image forming accelerator has a function of accelerating the transfer of the base or the base precursor, accelerating the reaction of the reducing agent and the silver salt, and accelerating the immobilization of the dye-donor substance by polymerization. Are classified into the above-mentioned bases or base precursors, nucleophilic compounds, oils, thermal solvents, surfactants, compounds that interact with silver or silver salts, compounds having an oxygen scavenging function, and the like. However, these substance groups generally have a composite function and usually have some of the above-mentioned accelerating effects together. Details thereof are described in the specifications and publications of U.S. Pat. No. 4,678,739, columns 38 to 40, JP-A-62-209443 and the like. The hexavalent metal compound described in Japanese Patent Application No. 2-272878 is also effective.

In the system for polymerizing a part of the polymerizable compound in which a latent image of silver halide is not formed, the photosensitive material is
A heat or photopolymerization initiator can be used for the purpose of initiating polymerization or for polymerizing an unpolymerized polymerizable compound after image transfer. Examples of thermal polymerization initiators include azo compounds, organic peroxides, inorganic peroxides, sulfinic acids and the like. Details thereof are described in pages 6 to 18 of “Addition Polymerization / Ring-Opening Polymerization” (1983, Kyoritsu Shuppan) edited by the Society for Polymer Science, Editorial Committee for Polymer Experiments.

Examples of the photopolymerization initiator include benzophenones, acetophenones, benzoins, thioxanthones and the like. Details thereof are described in "UV Curing System" (1989, Comprehensive Technical Center), pages 63 to 147, and the like. Various surfactants may be used in the light-sensitive material for the purpose of coating aid, improvement of peeling property, improvement of sliding property, antistatic property, acceleration of development and the like. Specific examples of the surfactant are disclosed in JP-A-62-17.
No. 3463, No. 62-183457 and the like. An antistatic agent can be used in the light-sensitive material for the purpose of antistatic. As an antistatic agent, Research Disclosure, November 1978, No. 17643 (27
Page) etc.

A dye having a property of being decolorized by heating or light irradiation may be contained in the photosensitive microcapsule. The dye having the property of being decolorized by heating or light irradiation can function as a yellow filter in a conventional silver salt photographic system. Regarding a light-sensitive material using a dye having the property of being decolorized by heating or irradiation with light as described above, Japanese Patent Laid-Open No.
It is described in JP-A-3-974940.

Various antifoggants or photographic stabilizers can be used in the present invention. For example,
Azoles and azaindenes described in RD17643 (1978), pages 24 to 25, JP-A-59-168442.
Nitrogen-containing carboxylic acids and phosphoric acids described in JP-A-59-111636, mercapto compounds and metal salts thereof described in JP-A-59-111636, and acetylene compounds described in JP-A-62-87957 are used. .

Various development stoppers can be used in the light-sensitive material for the purpose of always obtaining a constant image with respect to the processing temperature and processing time during development. The term "development terminating agent" as used herein refers to a compound that immediately neutralizes or reacts with a base to reduce the concentration of the base in the film to stop the development after proper development, or inhibits development by interacting with silver and a silver salt. Compound. Specific examples thereof include an acid precursor that releases an acid when heated, an electrophilic compound that causes a substitution reaction with a coexisting base when heated, or a nitrogen-containing heterocyclic compound, a mercapto compound and a precursor thereof. More specifically, JP-A-62-253159, pages (31) to (32), JP-A-1-724
No. 79, No. 1-3471, etc. are described.

In addition to the above, examples of optional components that can be contained in the photosensitive layer and the usage thereof are also described in the application specification regarding the series of photosensitive materials described above and Research Disclosure Vol.
No. 17029, June 1978 (pages 9 to 15). As the layer that can be optionally provided in the photosensitive material,
Examples thereof include a heating element layer, an antistatic layer, an anti-curl layer, a peeling layer, a cover sheet or a protective layer.

A photosensitive material using a heating element layer is disclosed in JP-A-61-294434, and a photosensitive material provided with a cover sheet or a protective layer is disclosed in JP-A-62-2.
Each of them is described in Japanese Patent No. 10447. Further, examples of other auxiliary layers and usage modes thereof are also described in the specification of the series of photosensitive materials described above.

In the following, the step of imagewise exposure in the image forming method of the present invention, the imagewise exposure, or after the imagewise exposure, the photosensitive material is heated from the surface of the support not coated with the photosensitive layer. And a step of pressurizing the photosensitive material,
And finally, the step of heating while applying pressure will be described. As the exposure method in the imagewise exposure step, various exposure means can be used, but in general, a latent image of silver halide is obtained by imagewise exposure to radiation including visible light. The type of light source and the amount of exposure can be selected according to the photosensitive wavelength of silver halide (wavelength sensitized when dye sensitization is performed) and sensitivity.

Typical light sources include low-energy radiation sources such as natural light, ultraviolet rays, visible light, infrared rays, fluorescent lamps, tungsten lamps, mercury lamps, halogen lamps, xenon flash lamps, laser light sources (gas laser, solid laser, Chemical lasers, semiconductor lasers, etc.), light emitting diodes, plasma arc tubes, FOTs and the like. In special cases, it is possible to use X-rays, γ-rays, electron beams, etc., which are high energy ray sources.

The light-sensitive material of the present invention, especially in the case of a full-color light-sensitive material, is composed of microcapsules having photosensitivity in a plurality of spectral regions, and therefore it is necessary to perform image exposure with a plurality of corresponding spectral lines. Is. Therefore, the above light sources may be used alone or in combination of two or more. When selecting the light source,
It goes without saying that a light source suitable for the photosensitive wavelength of the photosensitive material is selected, but it can be selected in consideration of whether image information passes through an electric signal, the processing speed of the entire system, compactness, power consumption, and the like.

When the image information does not pass through an electric signal, for example, direct shooting of landscapes and people, direct copying of original images,
In the case of exposing through a positive such as a reversal film, an exposure device for printing such as a camera, a printer or an enlarger, an exposure device for a copying machine or the like can be used. In this case, a two-dimensional image can be simultaneously exposed by so-called one shot, or scanning exposure can be performed through a slit or the like. You can also stretch or reduce the original image. In this case, the light source is not a monochromatic light source such as a laser but a light source such as a tungsten lamp or a fluorescent lamp, or a combination of a plurality of monochromatic light sources.

When image information is recorded via an electric signal, as the image exposure device, a light emitting diode and various lasers may be used in combination according to the color sensitivity of the heat developable color photosensitive material. Various devices known as image display devices (CRT, liquid crystal display, electroluminescent display, electrochromic display, plasma display, etc.) can also be used. In this case, the image information is an image signal obtained from a video camera or an electronic still camera, a television signal represented by Nippon Television Signal Standard (NTSC),
An image signal obtained by dividing an original image into a large number of pixels with a scanner or the like, or an image signal stored in a recording material such as a magnetic tape or a disk can be used.

When exposing a color image, LEDs, lasers, fluorescent tubes and the like are used in combination according to the color sensitivity of the light-sensitive material. However, the same materials may be used in combination or different kinds may be used in combination. May be. The color sensitivity of the light-sensitive material is R (red), G (green), B (blue) in the photographic field.
Photosensitivity is normal, but in recent years, it is often used in combination with UV, IR, etc., and the range of use of the light source is expanding. For example, the color sensitivity of the photosensitive material is (G, R, IR)
Or (R, IR (short wave), IR (long wave)),
(UV (short wave), UV (medium wave), UV (long wave)), (U
Spectral regions such as V, B, G) are utilized. The light source may also be a combination of different types such as a combination of two LED colors and a laser. The light emitting tube or element may be scanned and exposed by using a single tube or element for each color, or an array tube may be used to increase the exposure speed. Examples of usable arrays include an LED array, a liquid crystal shutter array, and a magneto-optical element shutter array.

The image display device described above is a CRT.
As described above, there is a color display and a monochrome display, but a method of performing exposure several times by combining a color display with a color filter may be adopted. Existing 2
The three-dimensional image display device may be used by making it one-dimensional like FOT, or by dividing one screen into several pieces and using them in combination with scanning. By the above imagewise exposure, a latent image is obtained on the silver halide contained in the microcapsules. The image forming method of the present invention includes a step of heating the photosensitive material at the same time as the imagewise exposure or after the imagewise exposure to thermally develop the photosensitive material. Thermal development is preferably performed by heating from the surface of the support on which the photosensitive layer of the photosensitive material is not coated.

As this heating means, there is disclosed in JP-A-61-29.
As in the light-sensitive material described in Japanese Patent No. 4434, a heating element layer may be provided on the surface of the support on which the light-sensitive layer of the light-sensitive material is not coated to heat it. Further, as described in JP-A-61-147244, a hot plate, an iron, and a heat roller are used, or as described in JP-A-62-144166, a photosensitive material is sandwiched between a heat roller and a belt. You may use the method of heating.

That is, the photosensitive material may be brought into contact with a heating element having a surface area larger than the area of the photosensitive material to heat the entire surface at the same time, or a heating element having a smaller surface area (heating plate,
The entire surface may be heated over time by bringing it into contact with a heat roller, a heat drum, etc. and scanning it.
In addition to the heating method in which the heating element and the photosensitive material are brought into direct contact with each other as described above, electromagnetic waves, infrared rays, hot air or the like can be applied to the photosensitive material to heat it in a non-contact state.

In the image forming method of the present invention, thermal development is carried out by heating the photosensitive material from the surface of the support on which the photosensitive layer is not coated, and at this time, the photosensitive layer is coated. The surface that is marked may be in direct contact with the air,
It may be covered with a heat insulating material or the like in order to keep it warm so as not to release heat. In this case, it is preferable not to apply a strong pressure (10 kg / cm ² or more) to the photosensitive layer so as not to destroy the microcapsules contained in the photosensitive layer. Further, the heat development by heating is carried out simultaneously with or after the imagewise exposure, but it is preferable to perform the heating after 0.1 seconds or more has passed after the imagewise exposure. Heating temperature is generally 60 ℃
To 250 ° C, preferably 80 ° C to 180 ° C,
The heating time is between 0.1 and 20 seconds, preferably between 0.5 and 5 seconds.

The photosensitive material can be subjected to heat development as described above to polymerize the polymerizable compound in the portion where the latent image of silver halide is formed or the portion where the latent image of silver halide is not formed. When a polymerization inhibitor is formed in the latent image-formed portion of silver halide by the reaction with a reducing agent, heat or photopolymerization initiation which has been added in advance in the photosensitive layer, preferably in the microcapsules. It is also possible to decompose the agent by heating or irradiating it with light to uniformly generate radicals and polymerize the polymerizable compound in the portion where the latent image of silver halide is not formed. In this case, in addition to the above-mentioned imagewise exposure step and heat development step, if necessary, a whole surface heating or whole surface exposure step is required, and the method is the same as the imagewise exposure step or the heat development step.

In the image-forming method of the present invention, one of the color image-forming substances (for example, a color-developing agent) is selected from the uncured microcapsules by further pressurizing the above-mentioned photosensitive material having a polymer image formed on the photosensitive layer. The other color image-forming substance (eg, a developer) that is released outside the microcapsules.
React with. Thereby, a color image can be obtained on the photosensitive material. A conventionally known method can be used as the pressurizing method.

For example, the photosensitive material may be sandwiched between press plates such as a presser, or pressure may be applied while being conveyed using a pressure roller such as a nip roll. The pressure may be intermittently applied by a dot impact device or the like. Further, high pressure air can be wiped with an air gun or the like, or can be pressurized with an ultrasonic generator, a piezoelectric element or the like. The pressure required for pressurization is 300 kg / cm ² or more, preferably 600 kg / cm ² or more. However, heating (40 ° to 1
When used in combination with 20 ° C), it may be 300 kg / cm ² or less. The light-sensitive material on which a color image has been obtained by the above method is heated under pressure in order to impart transparency and glossiness.
Generally, it is convenient to use a heating roller (60 ° -180 ° C). If a pressure roller is also heated (60 ° to 180 ° C) at the stage of forming a color image, a color image excellent in glossiness or transparency can be instantly obtained, and the apparatus should be designed compactly. Is also possible.

The light-sensitive material of the present invention is a black-and-white or color light-sensitive material for photography and printing, a light-sensitive material for printing, a plate, a computer graphic hard copy light-sensitive material, a light-sensitive material for copiers, a medical light-sensitive material (for X-ray, For ultrasonic diagnostic CRT)
In addition, since the image forming method of the present invention is a monosheet, it is suitable for forming an image forming system such as a compact and inexpensive copying machine, printer, and simple printing machine.

[0076]

【Example】

Example 1 Preparation and Evaluation of Photosensitive Material A Preparation of Silver Halide Emulsion (EG-1) 24 g of lime-treated inert gelatin was added to 900 cc of distilled water, dissolved at 40 ° C. for 1 hour, and 3 g of NaCl was added thereto, and 1N was added thereto. The pH was adjusted to 3.2 by adding sulfuric acid.

After adding 10 mg of (AGS-1) to this solution, the solution I and the solution II were kept at 60 ° C. by the control double jet method while keeping pAg = 8.5, and at the same time, it took 15 minutes until the solution I disappeared. Added. After the addition is complete, p
H was adjusted to 6.0 with 1N NaOH and (AZ-1) 6.
4 mg and (AZ-2) 4.8 mg were added to 60 at 60 ° C.
Aged. After the aging, 450 mg of (SG-1) was added, and 100 g of an aqueous solution containing 4.1 g of KI was added at an equal flow rate over 20 to 30 minutes after the addition.

To this emulsion, 1.1 g of poly (isobutylene-monosodium coumarate) was added, precipitated, washed with water and desalted, and then 6 g of lime-processed gelatin was added and dissolved, and further 3.5 of (ATR-3). % Aqueous solution (1.5 cc) was added to adjust the pH to 6.2. Average particle size 0.18
Monodispersed silver iodobromide emulsion (EG-
1) 550 g was prepared.

Liquid I AgNO ₃ 120 g Distilled water 550 cc Liquid II KBr 85 g Distilled water 550 cc

[0080]

[Chemical 1]

Preparation of solid dispersion (KB-1) 5.4 of lime-processed gelatin in a 300 ml dispersion container.
% Aqueous solution 110 g, polyethylene glycol (average molecular weight 2000) 5% aqueous solution 20 g, base precursor (BG-1) 70 g, and glass beads 200 ml having a diameter of 0.5 to 0.75 mm are added, and 300 using a Dynomill.
Disperse at 0 rpm for 30 minutes, adjust to pH 6.5 with 2N sulfuric acid.
Adjusted to 1.0 μm or less and a base precursor (B
A solid dispersion (KB-1) of G-1) was obtained.

[0082]

[Chemical 2]

Preparation of Coloring Agent Solution (DS) To 255 g of the following polymerizable compound (MN-1), 38 g of the following black type coloring agent (D-1) was mixed and stirred at 80 ° C. for 1 hour,
A color former solution (DS) was prepared. Polymerizable compound (MN-1) Compound described in Synthesis Example 1 of JP-A-64-68339 (manufactured by Nippon Kayaku Co., Ltd.)

[0084]

[Chemical 3]

Preparation of Photosensitive Composition (DG-1) To 194 g of color developer solution (DS), (SV-
1) 36 g of 10% (wt%) solution, (RD-1) 4.
6 g, (RD-3) 12.4 g, (FF-3) (SV
-1) 8 cc of 0.5% (wt%) solution and 2 g of polyethylene glycol 2000 were added and dissolved to prepare an oily solution. A silver halide emulsion (EG-
1) 50 g and 96 g of solid dispersion (KB-1) were added,
While maintaining the temperature at 60 ° C., a 50φ dissolver was used to stir at 7,000 rpm for 5 minutes to obtain a photosensitive composition (DG-1) as a W / O emulsion.

[0086]

[Chemical 4]

Preparation of Photosensitive Microcapsule Dispersion Liquid (A) 18 g of a 12% aqueous solution of polymer (2P-4) was added to 20 g of water.
2 g was added and the mixed solution was adjusted to pH 5.0 with 1N sulfuric acid. A 10% aqueous solution of polymer (2P-2) 18
0 g was added and mixed at 60 ° C. for 30 minutes. This mixed solution was added to the above-mentioned photosensitive composition (DG-1), and stirred at 60 ° C. at 10,000 rpm for 10 minutes using a 50φ dissolver to obtain an emulsion in the state of W / O / W emulsion.
Separately, 52.2 g of a 37% aqueous solution of formaldehyde and 170.3 g of water were added to 31.5 g of melamine, and the mixture was heated at 60 ° C.
The mixture was heated to 1, and stirred for 30 minutes to obtain a transparent aqueous solution of the melamine-formaldehyde initial condensation product.

132 g of this initial condensate was added to the emulsified product in the state of W / O / W emulsion cooled to 40 ° C., and stirred with a propeller blade at 1200 rpm for 1N.
32 cc of sulfuric acid was added. This solution is then 70 minutes for 30 minutes.
The temperature was raised to 0 ° C., and the mixture was further stirred for 30 minutes. To this was added 54 g of a 40% aqueous solution of urea, 24 cc of 1N sulfuric acid was added, and stirring was continued at 70 ° C. for another 40 minutes. After this solution was cooled to 50 ° C., a 1N aqueous sodium hydroxide solution was added to adjust the pH to 6.5 to prepare a photosensitive microcapsule dispersion (A). The volume average particle size of the microcapsules measured by Coulter Multisizer II (Coulter, Inc.) was 13.5μ. Polymer (2P-2) Polyvinylpyrrolidone K-90 Polymer (2P-4) Potassium polyvinylbenzenesulfinate-co-acrylamide

Preparation of Developer Solid Dispersion Liquid 30 g of a powder of the developer DP-1 was mixed with a 3% aqueous solution of polyvinyl alcohol (trade name; PVA-205, Kuraray Co., Ltd.) 1
Mix with 20 g and use a Dyno-mill disperser for 3000 r / min.
It was crushed and dispersed for 20 minutes at pm. The obtained liquid is used as a solid developer dispersion (DP-1). On the other hand, a liquid obtained by pulverizing and dispersing 30 g of the powder of the developer DP-2 by the same method is used as a solid developer dispersion (DP-2).

[0090]

[Chemical 5]

Preparation of Thermoplastic Resin Dispersion Liquid (A) Poly α-methylstyrene (trade name: Crystalrex 1
120, softening point 120 ° C, manufactured by Rika Hercules Co., Ltd.
The powder of (1) was roughly pulverized in an automatic mortar, and 60 g of this was taken and roughly dispersed in a mixed liquid of 120 g of a 1% aqueous solution of sodium salt of sulfosuccinate and 120 g of water. This crude dispersion is applied to an Eiger motor mill, 2000 r.p.
It was pulverized at m. for about 25 minutes to prepare a thermoplastic resin dispersion liquid (A) having an average particle diameter of about 1 μm.

Preparation of Photosensitive Material (A) 10 g of the above-mentioned photosensitive microcapsule dispersion liquid (A),
The developer solid dispersion (DP-1) (7.5 g) and (D)
P-2) 7.5g and the thermoplastic resin dispersion liquid (A) 10g were mixed, and the coating liquid was produced. The amount of liquid applied is 105g
/ M using a rod to be ^2, then coated to a thickness 100μm polyester transparent base on, and dried at 50 ° C., it was prepared photosensitive material (A).

Evaluation of Photosensitive Material (A) The photosensitive material (A) was cut into a length of 2.6 cm and a width of 12 cm,
After passing through a wedge whose density continuously changes from 0 to 3.0 and using a tungsten bulb for imagewise exposure at 2000 lux for 1 second, the resultant was placed on a hot plate heated to 140 ° C. and heated for 10 seconds. Then pressure 150kg
After passing through a heating roller at 50 ° C./cm ^2, it was passed between a pair of rollers heated to 150 ° C. in a state of being overlapped with a release paper coated with a silicone resin. After that, when the release paper was peeled off, a clear and clear image was obtained.

Example 2 Preparation and Evaluation of Photosensitive Material (B) Preparation of Developer Emulsion Developer 19 (g) and developer (DP-3) 11.
2 g was mixed with a mixed solution of 20 g of acetic acid ethyl ester and 20 g of the polymerizable compound (MN-1) at 70 ° C. for 1 hour,
It was dissolved with stirring. On the other hand, polyvinyl alcohol (trade name;
PVA-217E, Kuraray Co., Ltd. 3% aqueous solution 14
0g and 8g of 5% aqueous solution of sodium sulfosuccinate
The above solution was added to the mixed solution of 1 and emulsified at 10,000 rpm for 10 minutes using a homogenizer. The particle size of the emulsion is LA-500 (HORIBA, particle size distribution measuring device)
The average was 0.5 μm.

Preparation of Photosensitive Material (B) 10 g of the photosensitive microcapsule dispersion (A) used in Example 1 was mixed with a fluorosurfactant (trade name; Surflon S-111, manufactured by Asahi Glass Co., Ltd.). 30% aqueous solution 2
g, and a 3% aqueous solution of sodium polystyrene sulfonate 3
After adding 5 g and stirring with a stirrer for 5 minutes, 5 g of the thermoplastic resin dispersion (A) prepared in Example-1 and 15 g of the color developer emulsion were added and well stirred. The coating solution thus obtained was coated in the same manner as in Example 1 so that the coating amount of the solution was 105 g / m ² , to prepare a photosensitive material (B).

Evaluation of Photosensitive Material (B) When the photosensitive material (B) was evaluated in the same manner as in Example-1, a transparent and clear image was obtained.

Example 3 Preparation and Evaluation of Photosensitive Material (C) Preparation of Undercoat Base of Thermoplastic Resin Polyamide resin (trade name; Tomeide # 1310, softening point 130 ° C., Fuji Kasei Kogyo KK) 30 g, toluene 35 g And a mixed solution of 35 g of isopropanol,
Melted at 60 ° C. This solution was coated on a 100 μm thick polyester base to a coating liquid of 70 g / m ^2.
Dried to obtain a thermoplastic resin undercoat base.

Preparation of Photosensitive Material (C) On the other hand, 10 g of the photosensitive microcapsule dispersion liquid (A) used in Example-1 and solid developer dispersion liquid (DP-1) 7.5.
g and 7.5 g of the solid developer dispersion (DP-2) are mixed, and this is coated on the above-mentioned thermoplastic resin undercoating base so that the liquid coating amount becomes 105 g / m ^2, and (C) was prepared.

Evaluation of Photosensitive Material (C) When the photosensitive material (C) was evaluated in the same manner as in Example-1, a transparent and clear image was obtained.

Example 4 Preparation and Evaluation of Photosensitive Material (D) Preparation of Silver Halide Emulsion (A-1) Gelatin aqueous solution (gelatin 1 in 1500 ml of water was stirred).
6 g and 0.5 g of sodium chloride, which was adjusted to pH 3.8 with 1N sulfuric acid and further kept at 60 ° C.), and an aqueous solution 300 containing 71 g of potassium bromide.
ml and an aqueous solution of silver nitrate (0.59 mol of silver nitrate dissolved in 300 ml of water) were simultaneously added at an equal flow rate over 50 minutes. Ten minutes after this was completed, 100 ml of an aqueous solution containing 2.9 g of potassium iodide and an aqueous silver nitrate solution (0.018 mol of silver nitrate dissolved in 100 ml of water) were simultaneously added over 5 minutes. Thus, a monodisperse tetradecahedral silver iodobromide emulsion having an average grain size of 0.22 μm was prepared. After washing the above emulsion with water and desalting,
0.5% of the following infrared sensitizing dye (IS-1) was added to this emulsion.
94 ml of a methanol solution and 2 of the compound (a) shown below
% Aqueous solution (75 ml) was added to obtain a silver halide emulsion (A-1) with a yield of 600 g.

[0101]

[Chemical 6]

Preparation of silver halide emulsions (A-2 to A-4) In the preparation of the above silver halide emulsion (A-1), instead of the infrared sensitizing dye (IS-1), the following red Same as the preparation of the silver halide emulsion (A-1), except that the external sensitizing dyes (IS-2), (IS-3) and (IS-4) are used in the respective addition amounts shown in Table 1. By performing various operations, the silver halide emulsion (A-
2), (A-3) and (A-4) were prepared.

[0103]

[Chemical 7]

The respective silver halide emulsions thus obtained are summarized in Table 1 below. Table 1 Silver halide emulsion Infrared sensitizing dye Addition amount (ml) (0.5% methanol solution) A-1 (IS-1) 94 A-2 (IS-2) 145 A-3 (IS-3) 67 A-4 (IS-4) 85

Preparation of Photosensitive Material (D) In the preparation of the photosensitive composition of Example-1, instead of 50 g of silver halide emulsion (EG-1), the silver halide emulsion (A- 1) 20 g, (A-2) 10 g,
A light-sensitive material (D) was produced in exactly the same manner except that a mixture of 10 g of (A-3) and 10 g of (A-4) was used.

Evaluation of Photosensitive Material (D) The photosensitive material (D) obtained above was processed and evaluated in the same manner as in Example-1. As a result, a clear and clear image was obtained. However, during the exposure, the amount of exposure was adjusted by changing the voltage or the exposure time. Also,
When exposed using a laser diode having a peak wavelength of 780 nm and processed in the same manner, a transparent and clear image was obtained.

Comparative Example 1 Preparation of Light-Sensitive Material (E) In the same manner as in the preparation of the light-sensitive material (A) of Example-1, except that 10 g of water was used instead of 10 g of the thermoplastic resin dispersion (A). A light-sensitive material (E) was prepared.

Evaluation of Photosensitive Material (E) The photosensitive material (E) was evaluated in the same manner as in Example 1. As a result, a monochrome image was obtained, but transparency was not obtained at all.

Comparative Example 2 Preparation of Light-Sensitive Material (F) In the same manner as in the preparation of Light-Sensitive Material (D) of Example-4, 10 g of water was used instead of 10 g of the thermoplastic resin dispersion (A). A photosensitive material (F) was prepared. Evaluation of Photosensitive Material (F) When the photosensitive material (F) was evaluated in the same manner as in Example 4, a monochromatic image was obtained, but transparency was not obtained at all. As described above, as is clear from Examples 1 to 4 and Comparative Examples 1 and 2, a thermoplastic substance is added to the outside of the photosensitive microcapsules in the photosensitive layer, or a layer below the photosensitive layer. When used for, it is possible to form a transparent image having transparency.

Claims (3)

[Claims] 1. A substance having silver halide, a reducing agent, a polymerizable compound, a thermoplastic substance, and two kinds of substances that cause a color reaction in a contact state on a support, and one of the substances causing the color reaction. And a photosensitive material containing the polymerizable compound in a microcapsule, and the other one that causes a color-forming reaction outside the microcapsule, a thermoplastic substance is contained outside the microcapsule of the microcapsule-containing layer, or A photosensitive material comprising a layer containing a thermoplastic substance provided separately from the layer containing microcapsules. 2. The thermoplastic material has a softening point of 60 ° to 16 °.
The photosensitive material according to claim 1, which is a thermoplastic polymer having a temperature of 0 ° C. 3. The photosensitive material according to claim 1 is subjected to development treatment simultaneously with imagewise exposure or after imagewise exposure, and then uncured polymerizable compound is removed by using a means such as a pressure roller. An image forming method, characterized in that a microcapsule containing the same is destroyed, and simultaneously with or after that, heating is performed while applying pressure.