JPH0623846B2 - Image forming method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an image forming method using a photosensitive material having a photosensitive layer containing a silver halide, a reducing agent and a polymerizable compound on a support.

BACKGROUND OF THE INVENTION An image forming method using a light-sensitive material having a light-sensitive layer containing a silver halide, a reducing agent and a polymerizable compound on a support is described in JP-B-45-11149 and 47-20741.
No. 49-10697, JP-A-57-138632.
No. 58-169143.
In these methods, when the exposed silver halide is developed using a developer, a coexisting polymerizable compound (eg, vinyl compound) initiates polymerization to form an image-like polymer compound. Therefore, the above method requires a development process using a liquid, and the process requires a relatively long time.

The present inventors attempted to improve the above method and invented a method capable of forming a polymer compound by a dry treatment, and the present invention has been applied for a patent (Japanese Patent Application No. 59-1913).
53). This method uses a photosensitive silver salt (silver halide),
By subjecting a recording material (photosensitive material) having a photosensitive layer composed of a reducing agent, a crosslinkable compound (polymerizable compound) and a binder supported on a support to imagewise exposure to form a latent image, and then thermally developing it. The polymer compound is formed in the portion where the latent image of the photosensitive silver salt is formed.

These image forming methods are methods in which the polymerizable compound in the portion where the latent image of silver halide is formed is polymerized. The present inventors have further invented a method capable of polymerizing a polymerizable compound in a portion where a latent image of silver halide is not formed, and this invention has already been applied for a patent (Japanese Patent Application Laid-Open No. 62-62-62).
70836). In this method, by heating, a reducing agent acts on the portion where the latent image of silver halide is formed to suppress the polymerization of the polymerizable compound, and at the same time, promotes the polymerization of other portions.

As one aspect of the image forming method as described above, a photosensitive material having a photosensitive layer containing a silver halide, a reducing agent and a polymerizable compound on a support, at the same time as imagewise exposure, or after imagewise exposure, There is an image forming method in which an unpolymerized polymerizable compound is transferred to an image receiving material by performing development processing and applying pressure in a state where the image receiving material is superposed on the developed photosensitive material. According to this image forming method, a clear image can be obtained on the image receiving material, but there is also a tendency that the image gradually becomes blurred depending on storage conditions and the like.

Further, Japanese Patent Application No. 61-53881 (JP-A-62-209)
No. 444), a silver halide, a reducing agent, a polymerizable compound, and two kinds of substances that cause a color reaction in a contact state, and one of the substances causing the color reaction and the above-mentioned polymerization. Of the photosensitive compound contained in the microcapsules, and the other substance among the substances causing the color-forming reaction is present outside the microcapsules containing the polymerizable compound on the support. An image obtained on a light-sensitive material using the light-sensitive material has a tendency that the image is gradually blurred due to storage conditions and the like.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming method in which an image obtained on an image receiving material or a photosensitive material retains its sharpness even after being stored for a long period of time or under severe conditions. Is.

The present invention has a photosensitive layer containing a silver halide, a reducing agent and a polymerizable compound on a support, and the silver halide, the reducing agent and the polymerizable compound are contained in photosensitive microcapsules. Is imagewise exposed to form a silver halide latent image, and the light-sensitive material is applied at the same time as the imagewise exposure or after the imagewise exposure.
A heat development treatment is performed by heating at 0 to 200 ° C. for 1 second to 5 minutes, whereby the polymerizable compound in the portion where the latent image is formed (or the portion where the latent image is not formed) is polymerized to form a latent image. By curing the photosensitive microcapsules in the exposed portion (or in the portion where the latent image is not formed) and pressing the image receiving material in the state of being superposed on the photosensitive material which has been subjected to the heat development treatment, the unpolymerized polymerizable compound is removed. The present invention provides an image forming method, which comprises transferring to an image receiving material and heating the image receiving material at 100 to 250 ° C. for 0.1 to 100 seconds.

Further, the present invention provides a support, a silver halide, a reducing agent,
A silver halide having a photosensitive layer containing a polymerizable compound and two kinds of substances that cause a color reaction in a contact state,
A reducing agent, a polymerizable compound, and one of the two types of substances that cause the color forming reaction are contained in a photosensitive microcapsule, and the other of the two types of substances that cause the color forming reaction are photosensitive. The light-sensitive material existing outside the microcapsules is imagewise exposed to form a latent image of silver halide, and the light-sensitive material is exposed at the same time as or after the imagewise exposure.
A heat development treatment is performed by heating at 0 to 200 ° C. for 1 second to 5 minutes, whereby the polymerizable compound in the portion where the latent image is formed (or the portion where the latent image is not formed) is polymerized to form a latent image. Two types that cause the color reaction by rupturing the uncured microcapsules by curing the photosensitive microcapsules in the exposed area (or the area where the latent image is not formed) and pressing the photosensitive material that has undergone heat development processing. An image forming method is also provided, which comprises bringing the substance of 1) into contact and heating the light-sensitive material at 100 to 250 ° C. for 0.1 to 100 seconds.

EFFECTS OF THE INVENTION The present invention is characterized in that after an image containing an unpolymerized polymerizable compound is formed on an image receiving material or a photosensitive material, the image receiving material or the photosensitive material is heated.

According to the study by the present inventors, since the unpolymerized polymerizable compound contained in the image formed on the image receiving material or the photosensitive material is liquid, it gradually diffuses to the surroundings, the image becomes blurred, and the sharpness is sharpened. It turns out that

In the image forming method of the present invention, since the image-receiving material or the light-sensitive material on which an image is formed is heated, the unpolymerized polymerizable compound is cured, and the above storability problem is solved. Therefore, the image obtained on the image-receiving material or the light-sensitive material according to the image forming method of the present invention retains its sharpness even after being stored for a long period of time or under harsh conditions. In the image forming method of the invention, a conventionally known method can be used as a method for heating the image receiving material or the photosensitive material on which an image is formed.

For example, the image receiving material or the photosensitive material may be directly contacted with a hot plate such as a hot plate or a drum, or heating may be performed while being conveyed using a heat roller.

It is also possible to use air heated to a high temperature, or to heat by high frequency heating or a laser beam. Infrared heaters may also be used to heat depending on the nature of the imaged material. Further, a method of heating by utilizing overcurrent generated by electromagnetic induction can be applied.

Further, the material on which the image is formed may be heated in a bath in which an inert liquid, for example, a fluorine-based liquid is heated.

Further, in addition to the above heating means, a heat source may be placed on the image receiving material or the photosensitive material for heating. For example,
A layer of conductive particles such as carbon black or graphite may be placed in the image receiving material or the photosensitive material, and Joule heat generated when electricity is applied may be used.

Generally, the heating temperature is preferably 100 ° C to 250 ° C, more preferably 120 ° C to 210 ° C. The heating time is generally 0.1 second to 100 seconds, more preferably 1 second to 50 seconds. When a heat development process is performed as a development process described later, the heat treatment of the image-receiving material or the photosensitive material on which an image is formed is preferably a heat treatment at a higher temperature and / or a longer time than the heat development process.

When the substance forming the formed image is easily affected by air oxidation, it is effective to perform degassing or replacement with an inert gas around the heating portion during heating. When the surface of the material on which an image is formed is heated to the air side, a method of preventing evaporation of moisture and volatile components and attaching a cover to the material surface for the purpose of keeping heat is also effective.

The imagewise exposure of the photosensitive material, the development treatment, the transfer of the unpolymerized polymerizable compound to the image receiving material, and the like in the image forming method of the present invention will be described below.

As the exposure method in imagewise exposure, various exposure means can be used, but generally, a latent image of silver halide is obtained by imagewise exposure of 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 (the wavelength sensitized when dye sensitization is performed) and the sensitivity. Further, the original image may be a monochrome image or a color image.

In the image forming method of the present invention, the heat development treatment is carried out simultaneously with the imagewise exposure or after the imagewise exposure. Since the heat development process is a dry process, it has an advantage that the operation is simple and the process can be performed in a short time.

As a heating method in the heat development treatment, various conventionally known methods can be used. Also, Japanese Patent Application Sho 60-
As in the light-sensitive material described in the specification of No. 135568, a heat-generating layer may be provided on the light-sensitive material and used as a heating means. The heating temperature is generally 80 ° C to 200 ° C, preferably 100 ° C to 160 ° C. The heating time is generally 1 second to 5 minutes, preferably 5 seconds to 1 minute.

In the image forming method of the present invention, the developing treatment is carried out as described above to polymerize the polymerizable compound in any portion of the silver halide latent image formed portion and the latent image not formed portion. In the image forming method of the present invention,
Generally, in the above-mentioned development processing, the polymerizable compound in the portion where the latent image of silver halide is formed is polymerized. However, as described above, a photosensitive material such as the photosensitive material described in Japanese Patent Application No. 60-21065 is used. By adjusting the type and amount of the reducing agent used, it is also possible to polymerize the polymerizable compound in the portion where the latent image of silver halide is not formed. As described above, the image forming method of the present invention can obtain a polymer image on the photosensitive layer of the photosensitive material. Further, a dye image can be obtained by fixing a dye or a pigment on the above polymer.

In the image forming method of the present invention, the photosensitive material that has been developed as described above is pressed with the image receiving material in a superposed state, thereby transferring the unpolymerized polymerizable compound to the image receiving material, and the image receiving material. You can get the image above. Various conventionally known methods can be used for the pressing means. Further, a general image forming method using an image receiving element such as an image receiving material is described in Japanese Patent Application No. 60-112284.

Further, using a photosensitive material having a photosensitive layer containing a silver halide, a reducing agent, a polymerizable compound, and a color image forming substance on a support as described below, the development treatment is performed as described above, and the polymerizable compound is added. Is cured by immobilizing the color image-forming substance in the cured portion, and then the image receiving material is pressed onto the light-sensitive material in which the color image-forming substance in the cured portion is immobilized, so that uncured Part of the color image-forming substance can be transferred to the image-receiving material. In this way, the image forming method of the present invention can easily obtain a color image on the image receiving material.

Further, it contains a silver halide, a reducing agent, a polymerizable compound, and two kinds of substances that cause a color reaction in a contact state, and one of the substances that cause the color reaction and the polymerizable compound are contained in microcapsules. Is in a
Then, among the substances that cause the above-mentioned color-forming reaction, a photosensitive material having a photosensitive layer on the support, which is present outside the microcapsules in which other substances contain the polymerizable compound, is subjected to the development treatment as described above. It is also possible to form a color image on the light-sensitive material by bringing the two kinds of substances, which rupture the uncured microcapsules and cause a color-developing reaction, into contact with each other by pressing the light-sensitive material that has been subjected to development processing.

The image forming method of the present invention heats the image receiving material or the photosensitive material on which an image is formed as described above, as described above.

The image forming method of the present invention is applicable to a large number of black and white or color photographing and printing, printing, printing plate, X-ray photographing, medical diagnostic photographing (for example, ultrasonic diagnostic machine CRT photographing), computer graphic hard copy, copying machine, and the like. It can be applied to the field.

Photosensitive materials that can be used in the image forming method of the present invention are described below.

The light-sensitive material used in the image forming method of the present invention comprises a silver halide, a reducing agent, and a polymerizable compound provided on a support. In the case of obtaining an image on a light-sensitive material as described above, a silver halide, a reducing agent, a polymerizable compound, and two types of substances that cause a color-forming reaction in a contact state, among the substances that cause the color-forming reaction, One of the substances and the polymerizable compound are in a state of being contained in a microcapsule, and the other substance among the substances that cause the color-forming reaction is outside the microcapsule containing the polymerizable compound. The layer is provided on a support.

In the present invention, the silver halide is not particularly limited,
A silver halide known in the photographic art can be used. In the image forming method of the present invention, any of silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodide, silver iodobromide and silver chloroiodobromide can be used as the silver halide. You can The halogen composition of the silver halide grains may be uniform or non-uniform on the surface and inside. In the present invention, the grain size of silver halide grains is such that the average grain size is 0.0
It is preferably from 01 μm to 10 μm, and 0.001 μ
Those of m to 5 μm are particularly preferable. Two or more kinds of silver halides having different crystal walls, halogen composition, grain size, grain size distribution and the like can be used in combination. The amount of the silver halide contained in the photosensitive layer is 1 mg to 10 g / m ^{2 in} terms of silver containing an organic silver salt which is an optional component described later.
It is preferable to set it as the range.

The reducing agent that can be used in the image forming method 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.
There are various kinds of substances as the reducing agent having the above function. Examples of the reducing agent include hydroquinones, catechols, p-aminophenols, p-phenylenediamines, 3-pyrazolidones, 3-aminopyrazoles, 4
-Amino-5-virazolones, 5-aminouracils,
4,5-Dihydroxy-6-aminopyrimidines, reductones, aminoreductones, o- or p-sulfonamidophenols, o- or p-sulfonamidonaphthols, 2-sulfonamidoindanones, 4-
Sulfonamide-5-pyrazolones, 3-sulfonamidoindoles, sulfonamide pyrazolobenzimidazoles, sulfonamide pyrazolotriazoles, α
-Sulfonamide ketones, hydrazines, etc. By adjusting the type and amount of the reducing agent, the polymerizable compound can be polymerized in either a portion where a latent image of silver halide is formed or a portion where a latent image is not formed. In the system in which the polymerizable compound in the portion where the latent image of silver halide is not formed is polymerized, it is particularly preferable to use 1-phenyl-3-pyrazolidones as the reducing agent.

Regarding various reducing agents having the above functions, Japanese Patent Application Nos. 60-22980, 60-29894 and 60-
68874, 60-226084, 60-22
No. 7527 and No. 60-227528. Regarding the reducing agent, "The Theory of the Photographic Process" 4th edition by T. James,
291-334 (1977), Research Disclosure, Vo1.170, June 1978, 17029.
Issue (pages 9 to 15), and Vo1.176, 1978, 1
It is also described in February 17643 (pages 22 to 31). Also in the image forming method of the present invention, the reducing agents (including those described as a developing agent or a hydrazine derivative) described in the above specifications and references can be effectively used. Therefore, the “reducing agent” in the present specification includes the reducing agents described in the above respective specifications and documents.

These reducing agents may be used alone, or as described in each of the above specifications, two or more reducing agents may be mixed and used. When using two or more reducing agents in combination. As the interaction of the reducing agent, firstly, promoting reduction of silver halide (and / or organic silver salt) by so-called superadditivity, and secondly, silver halide (and / or organic silver salt). ) It is possible that the oxidant of the first reducing agent generated by the reduction of (1) causes the polymerization of the polymerizable compound (or suppresses the polymerization) via the redox reaction with other coexisting reducing agents. . However, in actual use, it is difficult to specify which of the above actions because the above reactions can occur simultaneously.

Specific examples of the reducing agent include pentadecylhydroquinone, 5-t-butylcatechol, p- (N, N-diethylamino) phenol, 1-phenyl-4-methyl-
4-hydroxymethyl-3-pyrazolidone, 1-phenyl-4-methyl-4-heptadecylcarbonyloxymethyl-3-pyrazolidone, 2-phenylsulfonylamino-4-hexadecyloxy-5-t-octylphenol, 2-phenyl Sulfonylamino-4-t-butyl-5-hexadecyloxyphenol, 2- (N-butylcarbamoyl) -4-phenylsulfonylaminonaphthol, 2- (N-methyl-N-octadecylcarbamoyl) -4-sulfonylaminonaphthol , 1-acetyl-2-phenylhydrazine, 1-acetyl-2-
{(P or o) -aminophenyl} hydrazine, 1-
Formyl-2-{(p or o) -aminophenyl} hydrazine, 1-acetyl-2-{(p or o) -methoxyphenyl} hydrazine, 1-lauroyl-2-
{(P or o) -aminophenyl} hydrazine, 1-
Trityl-2- (2,6-dichloro-4-cyanophenyl) hydrazine, 1-trityl-2-phenylhydrazine, 1-phenyl-2- (2,4,6-trichlorophenyl) hydrazine, 1- {2- (2,5-di-t-pentylphenoxy) butyroyl} -2-{(p or o)
-Aminophenyl} hydrazine, 1- {2- (2,5-
Di-t-pentylphenoxy) butyroyl} -2-
{(P or o) -aminophenyl} hydrazine pentadecyl fluorocaprylate, 3-indazolinone,
1- (3,5-dichlorobenzoyl) -2-phenylhydrazine, 1-trityl-2-[{2-N-butyl-N
-Octylsulfamoyl) -4-methanesulfonyl}
Phenyl] hydrazine, 1- {4- (2,5-di-t-
Pentylphenoxy) butyroyl} -2-{(p or o) -methoxyphenyl} hydrazine, 1- (methoxycarbonylbenzohydryl) -2-phenylhydrazine, 1-formyl-2- [4- {2- (2, 4-di-t
-Pentylphenoxy) butylamido} phenyl] hydrazine, 1-acetyl-2- [4- {2- (2,4-di-t-pentylphenoxy) butylamido} phenyl]
Hydrazine, 1-trityl-2-[{2,6-dichloro-4- (N, N-di-2-ethylhexyl) carbamoyl} phenyl] hydrazine, 1- (methoxycarbonylbenzohydryl) -2- (2,2 4-dichlorophenyl)
Hydrazine, and 1-trityl-2-[{2- (N-
Ethyl-N-octylsulfamoyl) -4-methanesulfonyl} phenyl] hydrazine and the like can be mentioned.

In the image forming method of the present invention, the reducing agent may be used in the range of 0.1 to 1500 mol% with respect to 1 mol of silver (including the above-described silver halide and an organic silver salt which is an optional component). preferable.

The polymerizable compound that can be used in the image forming method of the present invention is not particularly limited, and known polymerizable compounds can be used. Since the image forming method of the present invention performs heat treatment, it has a high boiling point (for example, a boiling point of 80
It is preferable to use compounds of (° C. or higher). Further, when a photosensitive material containing a color image-forming substance as an optional component to be described later is used for the photosensitive layer, the polymerizable compound is incorporated into the molecule in order to immobilize the color image-forming substance by polymerizing and curing the polymerizable compound. A crosslinkable compound having a plurality of polymerizable functional groups is preferable.

The polymerizable compound used in the image forming method 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.

Examples of the compound having an ethylenically unsaturated group which can be used in the image forming method of the present invention include acrylic acid and salts thereof, acrylic acid esters, acrylamides, methacrylic acid and salts thereof, methacrylic acid esters and methacrylamide. , Maleic anhydride, maleic acid esters, itaconic acid esters, styrenes, vinyl ethers, vinyl esters, N-vinyl heterocycles, allyl ethers, allyl esters and their derivatives.

Specific examples of the polymerizable compound that can be used in the present invention include acrylic acid esters such as n-butyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, benzyl acrylate, furfuryl acrylate, ethoxyethoxyethyl acrylate, dicyclohexyloxy. Ethyl acrylate, nonylphenyloxyethyl acrylate, hexanediol diacrylate, butanediol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate,
Examples thereof include polyoxyethylenated bispheninol A diacrylate, hydroxypolyether polyacrylate, polyester acrylate and polyurethane acrylate.

Other specific examples of methacrylic acid esters include methyl methacrylate, butyl methacrylate, ethylene glycol dimethacrylate, butanediol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, pentaerythritol trimethacrylate, and pentaerythritol tetramethacrylate. Methacrylate and dimethacrylate of polyoxyalkylenated bisphenol A and the like can be mentioned.

The polymerizable compounds may be used alone or in combination of two or more. A substance obtained by introducing a polymerizable functional group such as a vinyl group or a vinylidene group into the chemical structure of the image forming substance which is the above-mentioned reducing agent or an optional component described later can also be used as the polymerizable compound of the present invention. Needless to say, the use of a substance that serves as a reducing agent and a polymerizable compound or a color image forming substance and a polymerizable compound as described above is also included in the aspect of the present invention.

In the image forming method of the present invention, the polymerizable compound is preferably used in the range of 0.05 to 1200% by weight based on silver halide. More preferable range of use is 5
To 950% by weight.

The polymerizable compound that can be used in the image forming method is described in the application specification regarding a series of image forming methods described above and below.

The light-sensitive material used in the image forming method of the present invention comprises a support and a light-sensitive layer containing a silver halide, a reducing agent, and a polymerizable compound. The support is not particularly limited, but when heat development is planned in the image forming method of the present invention, it is preferable to use a material that can withstand the processing temperature of the heat development. Further, as described above, when an image is obtained on a light-sensitive material, the light-sensitive material is heated. Therefore, it is preferable to use a material that can withstand the heating temperature as well. Materials that can be used for the support, glass, paper, woodfree paper, coated paper, cast coated paper, synthetic paper, metal and its analogs, polyester, acetyl cellulose, cellulose ester, polyvinyl acetal, polystyrene, polycarbonate,
Examples thereof include films such as polyethylene terephthalate, and paper laminated with a resin material or a polymer such as polyethylene.

In the image forming method of the present invention, a polymer image can be obtained on the image receiving material by using the light-sensitive material having the above-mentioned constitution, but a color image can be formed by including a color image-forming substance as an optional component in the light-sensitive layer. It can also be formed. The color image forming substance is not particularly limited, and various types can be used. That is, a substance that is itself colored (dye or pigment), or energy that is colorless or pale but is external (heat, pressure, light irradiation, etc.) or another component (developing agent) A substance (color former) that develops a color upon contact is also included in the color image forming substance. Further, as described above, when an image is obtained on a light-sensitive material, two types of substances, such as the above-mentioned color-developing agent and a color-developing agent, which cause a color-forming reaction in a contact state are used as the color image-forming substances.

When a plurality of the color image-forming substances are used, they are used in combination with at least three kinds of silver halide emulsions sensitive to mutually different spectral regions (the silver halide emulsion will be described later) to correspond to the respective emulsions. Thus, a color image can be easily formed. An example of a color image forming substance that can be used in the image forming method is described in Japanese Patent Application No. 59-195407.

Dyes and pigments that are themselves colored substances are commercially available, as well as various documents (eg, "Handbook of Dyes" edited by the Society of Synthetic Organic Chemistry, published in 1970, "Handbook of Latest Pigments" edited by the Japan Pigment Technology Association, Known ones described in 1975 can be used. These dyes or pigments are used after being dissolved or dispersed.

On the other hand, examples of the substance that develops color by some energy such as heating, pressurization, and light irradiation are thermochromic compounds,
Known are piezochromic compounds, photochromic compounds, and leuco bodies such as triarylmethane dyes, quinone dyes, indigoid dyes, and azine dyes. All of them develop color by heating, pressurizing, light irradiation or air oxidation.

The two types of substances that cause a color reaction in a contact state include various systems that develop a color by an acid-base reaction, a redox reaction, a coupling reaction, a chelate formation reaction, etc. between two or more components. For example, pressure-sensitive copying paper (pages 29 to 58) and azography (87 to 95) described in "Introduction to Special Paper Chemistry" by Hiroyuki Moriga (published in 1975).
Page), known color development systems such as thermosensitive color development due to chemical changes (pages 118-120), or a seminar entitled "Latest dye chemistry-Attractive utilization and new development as functional dyes-" sponsored by the Kinki Chemical Industry Association. The coloring system and the like described on pages 26 to 32, (June 19, 1980) can be used. Specifically, color-forming agents with partial structures such as lactones, lactams, and spiropyrans used in pressure-sensitive paper, and acidic substances such as acid clay and phenols (developing agents).
A coloring system consisting of: a system utilizing the azo coupling reaction of aromatic diazonium salts, diazotates, diazosulfonates with naphthols, anilines, active methylenes; hexamethylenetetramine with ferric ion and gallic acid Chelation reaction such as reaction or reaction between phenolphthalein-complexone and alkaline earth metal ion; reaction between ferric stearate and pyrogallol or reaction between silver behenate and 4-methoxy-1-naphthol A redox reaction or the like can be used.

The photosensitive material used in the image forming method of the present invention has a polymerizable compound dispersed in the photosensitive layer in the form of oil droplets, and among the components contained in the photosensitive layer, at least the color image forming substance is in the oil droplets of the polymerizable compound. Is preferably present in. Other components in the photosensitive layer such as silver halide and a reducing agent may be contained in the oil droplets. An example of a photosensitive material in which a polymerizable compound is dispersed in the photosensitive layer in the form of oil droplets and an image forming method using the same is described in Japanese Patent Application No. 60-218603.

The oil droplets of the polymerizable compound are more preferably in the form of microcapsules. Various known techniques can be applied to this microencapsulation method without particular limitation. Further, as described above, when an image is obtained on a light-sensitive material, one of the substances that cause a color reaction and the polymerizable compound are contained in a microcapsule, and the other substance of the substances that cause a color reaction is polymerized. Is present outside the microcapsules containing the active compound. For an example of an image forming method using a photosensitive material in which oil droplets of a polymerizable compound are in a microcapsule state, see Japanese Patent Application No. 60-1.
No. 17089 is described in each specification.

As an example of the above-mentioned known technique, US Pat.
US Pat. No. 3,287,154 and British Patent No. 990443, and Japanese Patent Publication Nos. 38-19574 and 42. −
U.S. Pat. No. 3,418,250 and U.S. Pat. No. 3,603,603;
No. 04, a method by precipitation of the polymer described in US Pat. No. 4,967,691; isocyanates described in US Pat. No. 3,796,669.
Method using polyol wall material; US Pat. No. 39145.
A method using the isocyanate wall material described in No. 11; US Pat. Nos. 4,001,140 and 4,087,376.
And U.S. Pat. No. 4,089,802. Urea-formaldehyde-based or urea-formaldehyde-resilicinol-based wall forming materials; US Pat.
Method using a wall forming material such as melamine-formaldehyde resin and hydroxypropyl cellulose described in Japanese Patent No. 25455; JP-B-36-9168 and JP-A-51-51168.
-9079 in sit by polymerization of monomers
u method; British Patent Nos. 927807 and 96507
No. 4, polymerization dispersion cooling method; US Pat. No. 311
1407 and British Patent No. 930422, the spray drying method etc. which are described can be mentioned. The method of microencapsulating the oil droplets of the polymerizable compound is not limited to the above, but a method of forming a polymer film as a microcapsule wall after emulsifying the core substance is particularly preferable.

Other optional components that can be contained in the photosensitive layer of the photosensitive material include sensitizing dyes, organic silver salts, various image forming accelerators (eg, bases or base precursors, oils, surfactants, antifoggants, Thermal solvent, etc.), thermal polymerization inhibitor, thermal polymerization initiator, development terminator, fluorescent whitening agent, anti-fading agent, antihalation or irradiation dye, matting agent,
Anti-smudge agents, plasticizers, water release agents, binders, etc.

For examples of sensitizing dyes that can be used in the image forming method and the light-sensitive material, see Japanese Patent Application No. 60-139746.
Japanese Patent Application No. 60-14 for examples of organic silver salts.
1799, respectively. The image forming method and the light-sensitive material using a base or a base precursor are described in Japanese Patent Application No. 227528/1985, and the image forming method and the light-sensitive material using a thermal polymerization initiator are described in Japanese Patent Application No. Each of them is described in the specification of No. 223347. Further, regarding an image forming method and a light-sensitive material using an antifoggant, Japanese Patent Application No.
-294337, 60-294338, 60-
Nos. 294339 and 60-294341, and an image forming method and a photosensitive material using a polyethylene glycol derivative as a thermal solvent are described in Japanese Patent Application No. 60-294340.
Examples of other components and their usages are also described in the above-mentioned specification of the application relating to the image forming method and Research Disclosure Vol. 170, June 1978, No. 17029 (pages 9 to 15). There is.

The sensitizing dye that can be used in the image forming method of the present invention is not particularly limited, and a silver halide sensitizing dye known in the photographic art and the like can be used. The sensitizing dye, methine dye, cyanine dye, merocyanine dye,
It includes complex cyanine dyes, holopolar cyanine dyes, hemicyanine dyes, styryl dyes, hemioxonol dyes and the like. These sensitizing dyes may be used alone or in combination. In particular, for the purpose of supersensitization, it is common to use a combination of sensitizing dyes. Further, together with the sensitizing dye, a dye which does not have a spectral sensitizing effect itself, or a substance which does not substantially absorb visible light but exhibits supersensitization may be used together. The addition amount of the sensitizing dye is generally 10 ^-8 per mol of silver halide.
To about 10 ^-2 mol.

In the image forming method of the present invention, the addition of the organic silver salt is particularly effective when heat development processing is planned as the development processing. That is, when heated to a temperature of 80 ° C. or higher,
It is considered that the above organic silver salt participates in a redox reaction using a latent image of silver halide as a catalyst. In this case, it is preferable that the silver halide and the organic silver salt are in contact with or in close proximity to each other. Examples of the organic compound that constitutes the organic silver salt include an aliphatic or aromatic carboxylic acid, a thiocarbonyl group-containing compound having a mercapto group or α-hydrogen, and an imino group-containing compound. Among them, benzotriazole is particularly preferable. The above organic silver salt is generally used in an amount of 0.01 to 10 mol, preferably 0.01 to 1 mol, per mol of silver halide. The same effect can be obtained by adding an organic compound (for example, benzotriazole) constituting the organic silver salt to the photosensitive layer instead of the organic silver salt.

Various image formation accelerators can be used in the image forming method of the present invention. The image forming accelerator includes a silver halide (and / or an organic silver salt) and a reducing agent for promoting the redox reaction between the redox agent and the photosensitive material to the image receiving material or image receiving layer (these will be described later). It has the function of promoting the movement of image forming substances. The image forming accelerator is further classified into a base or a base precursor, an oil, a surfactant, an antifoggant, a thermal solvent and the like from the viewpoint of physicochemical function. However, these substance groups generally have a composite function, and usually have some of the above-mentioned accelerating effects together. Therefore, the above classification is convenient, and in fact, one compound often has a plurality of functions.

Examples of image forming accelerators include bases, base precursors, oils, surfactants, antifoggants and hot solvents.

Examples of preferable bases include alkali metal or alkaline earth metal hydroxides as inorganic bases, zinc hydroxide or zinc oxide in combination with a chelating agent such as sodium picolinate, and secondary or tertiary phosphates. , Borate,
Carbonates, metaborates; ammonium hydroxides; quaternary alkylammonium hydroxides; hydroxides of other metals, etc., and organic bases include aliphatic amines (trialkylamines, hydroxylamines). , Aliphatic polyamines); aromatic amines (N-alkyl-substituted aromatic amines, N-hydroxylalkyl-substituted aromatic amines and bis [p- (dialkylamino) phenyl] methanes), heterocyclic amines , Amidines, cyclic amidines, guanidines, cyclic guanidines, quinoline salts and the like, with pKa of 7 or more being particularly preferable.

Examples of the base precursor include salts of organic acids and bases that are decarboxylated by heating, compounds that release amines by reactions such as intramolecular nucleophilic substitution reaction, Rossen rearrangement, Beckmann rearrangement, etc. Compounds that release and generate a base by electrolysis are preferably used. Specific examples of the base precursor include guanidine trichloroacetic acid, piperidine trichloroacetic acid, morpholine trichloroacetic acid, p-triidine trichloroacetic acid, 2-picoline trichloroacetic acid, phenylsulfonylacetic acid guanidine, 4-chlorophenylsulfonylacetic acid guanidine, and 4-methyl. -Sulfonylphenylsulfonyl guanidine acetate, 4-acetylaminomethylpropiolic acid guanidine and the like can be mentioned.

In the image forming method of the present invention, the base or base precursor can be used in a wide range of amount. The base or base precursor is suitably used in an amount of 50% by weight or less in terms of weight of the coating film of the photosensitive layer, more preferably 0.01% by weight to 40% by weight. In the present invention, the base and / or base precursor may be used alone or as a mixture of two or more kinds.

As the oil, a high boiling point organic solvent used as a solvent for emulsifying and dispersing a hydrophobic compound can be used.

Examples of the surfactant include pyridinium salts, ammonium salts, phosphonium salts described in JP-A-59-74547 and polyalkylene oxides described in JP-A-59-57231.

Examples of the antifoggant include compounds having a 5- or 6-membered nitrogen-containing heterocyclic structure (including compounds having a cyclic amide structure), thiourea derivatives, thioether compounds, thiol derivatives, etc., which are known in the conventional photographic art. Can be mentioned.

As the hot solvent, a compound which can be a solvent for the reducing agent, a compound which is a substance having a high dielectric constant and is known to accelerate the physical development of the silver salt, and the like are useful. As a useful thermal solvent,
Polyethylene glycols described in U.S. Pat. No. 3,347,675, derivatives of polyethylene oxide such as oleic acid ester, beeswax, monostearin and -SO.
High dielectric constant compounds having _2- and / or --CO-- groups, polar substances described in US Pat. No. 3,667,959, 1,10-decanediol described in Research Disclosure, December 1976, pages 26-28. , Methyl anisate, biphenyl suberate and the like are preferably used.

The thermal polymerization initiator that can be used in the image forming method of the present invention is a compound that generally undergoes thermal decomposition under heating to generate a polymerization initiation species (particularly a radical), and is usually used as a radical polymerization initiator. Is. Regarding the thermal polymerization initiator, pages 6 to 1 of “Additional Polymerization / Ring-Opening Polymerization”, edited by Editorial Committee of Polymer Society for Polymer Science, 1983, Kyoritsu Shuppan)
It is described on page 8 and the like. Specific examples of the thermal polymerization initiator include azobisisobutyronitrile, 1,1′-azobis (1-cyclohexanecarbonitrile), dimethyl-
Azo compounds such as 2,2′-azobisisobutyrate and 2,2-azobis (2-methylbutyronitrile) azobisdimethylvaleronitrile, benzoyl peroxide, di-t-
Organic peroxides such as peroxides, dicumyl peroxide, t-butyl hydroperoxide, cumene hydroperoxide, inorganic peroxides such as hydrogen peroxide, potassium persulfate, ammonium persulfate, and sodium p-toluenesulfinate Etc. can be mentioned. The thermal polymerization initiator is preferably used in the range of 0.1 to 120% by weight with respect to the polymerizable compound, and 1 to 10% by weight.
It is more preferable to use the above range.

In the light-sensitive material used in the image forming method of the present invention, the heat-polymerization initiator is contained in the microcapsules to be contained in the light-sensitive layer, so that the heat-polymerization initiator does not undergo thermal development but receives an image after image formation. It may be acted upon heating the material or the photosensitive material. The method of using a photosensitive material having a photosensitive layer containing a thermal polymerization initiator has an advantage that the polymerization reaction of the unpolymerized polymerizable compound contained in the formed image is promoted, and an image excellent in storability is obtained. . Further, by using the thermal polymerization initiator, it is possible to lower the heating temperature in heating the image-receiving material or the photosensitive material after image formation or to shorten the heating time.

The development terminator which can be used in the image forming method of the present invention is a compound or silver and a silver salt which, after proper development, rapidly neutralize or react with a base to lower the concentration of the base in the film and stop the development. It is a compound that interacts with and suppresses development. 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, a nitrogen-containing heterocyclic compound, and a mercapto compound. Examples of acid precursors include oxime esters described in Japanese Patent Application Nos. 58-216928 and 59-48305, and Japanese Patent Application No. 59-8583.
Examples thereof include compounds releasing an acid by Rossen rearrangement described in No. 4, and examples of electrophilic compounds that cause a substitution reaction with a base by heating include compounds described in Japanese Patent Application No. 59-85836. .

The anti-smudge agent used in the image forming method of the present invention is preferably solid particles at room temperature. Specific examples thereof include starch particles described in British Patent No. 12322347, polymer fine powder described in U.S. Pat. No. 3,625,736, and microcapsule particles containing no color former described in British Patent No. 1235991. Examples thereof include fine cellulose powder described in US Pat. No. 2,711,375, talc, kaolin, bentonite, pyrophyllite, zinc oxide, titanium oxide, and inorganic particles such as alumina. The average particle size of the above particles is preferably in the range of 3 to 50 μm in volume average diameter, and 5 to 40 μm.
Is more preferable. As described above, when the oil droplets of the polymerizable compound are in the microcapsule state, it is more effective that the particles are larger than the microcapsules.

The binder that can be used in the light-sensitive material and the image-receiving material used in the image forming method of the present invention can be contained in the light-sensitive layer or the image-receiving layer (described later) alone or in combination. It is preferable to mainly use a hydrophilic binder. The hydrophilic binder is typically a transparent or translucent hydrophilic binder, and examples thereof include gelatin, gelatin derivatives, cellulose derivatives, starch,
It includes natural substances such as arabic gum and the like, and synthetic polymeric substances such as water-soluble polyvinyl compounds such as polyvinyl alcohol, polyvinylpyrrolidone and acrylamide polymers. Other synthetic polymeric materials include dispersed vinyl compounds in the form of latices, which increase the dimensional stability of photographic materials in particular.

Examples of layers that can be optionally provided in the light-sensitive material include an image receiving layer, a heating element layer, a protective layer, an antistatic layer, an anti-curl layer, a peeling layer, and a matting agent layer.

As described above, the image forming method of the present invention can form an image on the image receiving material by transferring the unpolymerized polymerizable compound to the image receiving material after developing the photosensitive material. In the embodiment in which the photosensitive layer of the photosensitive material contains a color image-forming substance,
Similarly, a color image forming substance can be transferred to an image receiving material to form a color image. The image receiving material comprises an image receiving layer having a function of fixing a color image forming substance released from the light sensitive material, and a support. Instead of using the image-receiving material, the image-receiving layer can be coated on the support common to the photosensitive layer as an optional layer of the photosensitive material as described above.

The image-receiving layer can be configured in various forms using various compounds according to the color-forming system of the color image-forming substance described above. For example, when a color-developing system comprising a color-developing agent and a color-developing agent is used, the image-receiving layer may contain the color-developing agent. Further, the image receiving layer may be composed of at least one layer containing a mordant. The mordant can be selected from compounds known in the photographic art and the like in consideration of conditions such as the type of color image forming substance and used. If necessary, a plurality of mordants having different mordant strengths may be used to form the image receiving element with two or more image receiving layers. When the image receiving layer is located on the surface of the light-sensitive material or the image receiving material, it is preferable to further provide a protective layer.

An example of an image receiving material and an image receiving layer that can be used in the image forming method is described in Japanese Patent Application No. 60-112284, and an image forming method using a heating element layer is described in Japanese Patent Application No. 60-135568. Each is described in the book. In addition, examples of other auxiliary layers and usage modes thereof are also described in the application specification relating to the series of image forming methods and photosensitive materials described above.

The light-sensitive material used in the image forming method of the present invention can be manufactured as described below.

Although various methods can be used as a method for producing a light-sensitive material, a general production method is to prepare a coating solution by dissolving, emulsifying or dispersing the components of the photosensitive layer in an appropriate solvent, and applying the solution. It comprises the steps of applying a liquid to a support and drying it to obtain a light-sensitive material.

Generally, the coating solution is prepared by preparing a liquid composition containing each component for each component, and then mixing each liquid composition. The liquid composition may be prepared for each component, or may be prepared to contain a plurality of components. A part of the components of the photosensitive layer may be added and used at the stage of preparing the liquid composition or the coating solution or after the preparation. Furthermore, as described below, a method of preparing a secondary composition by emulsifying an oily (or aqueous) composition containing one or more components in an aqueous (or oily) solvent can also be used. .

Hereinafter, a method for preparing a liquid composition and a coating liquid will be described with respect to main components contained in the photosensitive layer.

In the production of a light-sensitive material, silver halide is preferably prepared as a silver halide emulsion. There are various methods known in the photographic art for the preparation of silver halide emulsions,
There are no particular restrictions on the production of the photosensitive material. The silver halide emulsion can be prepared by any of the acidic method, the neutral method and the ammonia method. As the reaction mode of the soluble silver salt and the soluble halogen salt, a one-sided mixing method,
Either a double jet method or a combination thereof may be used. Back mixing method and pA for mixing particles under silver ion excess conditions
A controlled double jet method that keeps g constant can also be adopted. Further, the silver halide emulsion may be a surface latent image type in which a latent image is mainly formed on the surface of a grain, or an internal latent image type in which a latent image is formed inside the grain. A direct reversal emulsion in which an internal latent image type emulsion and a nucleating agent are combined can also be used.

In the preparation of a silver halide emulsion used for producing a light-sensitive material, it is preferable that a hydrophilic colloid (eg gelatin) is used as a protective colloid. By preparing a silver halide emulsion using a hydrophilic colloid, the sensitivity of a light-sensitive material produced using this emulsion is improved. The silver halide emulsion contains ammonia, an organic thioether derivative (see JP-B-47-386) and a sulfur-containing compound (see JP-A-53-144319) as a silver halide solvent in the step of forming silver halide grains. Etc. can be used. Further, in the process of grain formation or physical ripening, a cadmium salt, a zinc salt, a lead salt, a thallium salt or the like may be allowed to coexist. Further, iridium chloride (III value or IV value) is used for the purpose of improving high illumination failure and low illumination failure.
Value), a water-soluble iridium salt such as ammonium hexachloroiridium salt, or a water-soluble rhodium salt such as rhodium chloride can be used.

Soluble salts may be removed from the silver halide emulsion after formation of a precipitate or after physical ripening. In this case, it can be carried out according to the Nudel washing method or the sedimentation method. The silver halide emulsion may be used without ripening, but it is usually chemically sensitized before use. In the emulsion for conventional type light-sensitive material, known sulfur sensitizing method, reduction sensitizing method, noble metal sensitizing method, or a sensitizing method using a sensitizing dye described in Japanese Patent Application No. 60-139746 is used alone or in combination. Can be used. These chemical sensitizations can also be carried out in the presence of a nitrogen-containing heterocyclic compound (JP-A-58-126526 and 58-2).
(See each publication of 15644).

When the organic silver salt described in the above-mentioned Japanese Patent Application No. 60-141799 is contained in the photosensitive layer, the organic silver salt emulsion may be prepared by a method similar to the method for preparing the silver halide emulsion. it can.

The polymerizable compound can be used as a medium for preparing a composition of other components in the photosensitive layer in the production of the photosensitive material. For example, a silver halide (including a silver halide emulsion), a reducing agent, or a color image-forming substance which is an optional component may be dissolved, emulsified or dispersed in a polymerizable compound to be used in the production of a light-sensitive material. it can. In particular, when a color image forming substance is contained in the photosensitive layer, it is preferable to include a color image forming substance in the polymerizable compound.
As described above, when an image is obtained on the photosensitive material,
One of the substances that cause a coloring reaction is included in the polymerizable compound. Further, as described later, when oil droplets of a polymerizable compound are microencapsulated, components such as a wall material necessary for microencapsulation may be included in the polymerizable compound.

The photosensitive composition containing a polymerizable compound containing silver halide can be prepared using a silver halide emulsion.
In addition to the silver halide emulsion, a silver halide powder prepared by freeze-drying or the like can be used for the preparation of the photosensitive composition. The photosensitive composition containing these silver halides can be obtained by stirring with a homogenizer, blender, mixer or other commonly used stirrer.

In addition, it is preferable to dissolve a copolymer composed of a hydrophilic repeating unit and a hydrophobic repeating unit in the polymerizable compound used for preparing the photosensitive composition. For a photosensitive composition containing the above copolymer, Japanese Patent Application No.
-261887 specification.

Further, instead of using the above copolymer, microcapsules containing a silver halide emulsion as a core substance may be dispersed in a polymerizable compound to prepare a photosensitive composition. The photosensitive composition containing the microcapsules containing the silver halide emulsion as a core substance is described in Japanese Patent Application No. 61-5750.

The polymerizable compound (including those containing other constituents such as the above-mentioned photosensitive composition) is preferably used as an emulsion emulsified in an aqueous solvent. Also, Japanese Patent Application Sho 60
When the oil droplets of the polymerizable compound are microencapsulated as in the light-sensitive material described in JP-A-117089, a wall material necessary for microencapsulation is added to this emulsion to further form an outer shell. The treatment can also be carried out at the stage of this emulsion. Further, a reducing agent or any other component may be added at the stage of the above emulsion. As described above, in the case of obtaining an image on a light-sensitive material, oil droplets of a polymerizable compound are microencapsulated, and substances out of the microcapsules among substances that cause a color-forming reaction are prepared as described above. Add to microcapsule solution.

When the polymerizable compound in the emulsion of the polymerizable compound is a photosensitive composition containing silver halide, it can be used as it is as a coating solution for a photosensitive material. Emulsions other than the above can be mixed with the composition of other components such as a silver halide emulsion and optionally an organic silver salt emulsion to prepare a coating solution. Other components may be added at the stage of this coating solution as in the case of the above emulsion.

A photosensitive material used in the image forming method of the present invention can be manufactured by applying the coating solution prepared as described above onto the support and drying it. The coating of the coating liquid on the support can be easily carried out according to known techniques.

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.

Example 1 Preparation of Silver Halide Emulsion An aqueous solution containing 21 g of sodium chloride and 56 g of potassium bromide in a stirring gelatin aqueous solution (containing 20 g of gelatin and 3 g of sodium chloride in 1000 m of water and kept at 75 ° C.). 600m and silver nitrate aqueous solution (water 600m
4) simultaneously dissolving 0.59 mol of silver nitrate)
Added at equal flow rate over 0 minutes. Thus, a monodisperse cubic silver chlorobromide emulsion (bromine 80 mol%) having an average grain size of 0.35 μm was prepared.

After washing the above emulsion with water to desalinate it, sodium thiosulfate 5
mg and 4-hydroxy-6-methyl-1,3,3a, 7
-Tetrazaindene (20 mg) was added and chemical sensitization was performed at 60 ° C. The yield of emulsion was 600 g.

Preparation of benzotriazole silver emulsion 28 g of gelatin and 13.2 g of benzotriazole were added to 3 parts of water.
It melted in 00m. The solution was stirred while maintaining the temperature at 40 ° C., and a solution prepared by dissolving 17 g of silver nitrate in 100 m of water was added over 2 minutes. Excess salt was precipitated and removed by adjusting the pH of the obtained emulsion. Then adjust the pH to 6.30
And a benzotriazole silver emulsion was obtained. The yield of emulsion was 400 g.

Preparation of Photosensitive Composition To 15 g of trimethylolpropane triacrylate, 0.06 g of a copolymer represented by the following formula, Pergascript Red I-6-B (manufactured by Ciba Geigy) 0.9.
g, a hydrazine derivative represented by the following formula (reducing agent)
1.07 g and 1.07 g of a developing agent (reducing agent) represented by the following formula were dissolved. To this solution was added 3.5 g of silver halide emulsion, 3.5 g of benzotriazole silver emulsion, prepared as described above, and Emarex NP-8.
A solution prepared by dissolving and mixing 0.3 g (manufactured by Nippon Emulsion Co., Ltd.) was added, and a homogenizer was used for 15 minutes at 40 ° C. for 15 minutes.
It was emulsified and dispersed at 000 rpm to prepare a photosensitive composition.

(Copolymer) (Hydrazine derivative) (Developer) Preparation of microcapsule solution A mixed solution of 8.2 g of 20% aqueous solution of Isoban (manufactured by Kuraray Co., Ltd.) and 39 g of 3% aqueous solution of pectin was adjusted to pH 4, and the whole amount of the photosensitive composition prepared as described above was added. Then, use a homogenizer at 40 ° C for 2 minutes at 7,000 r.
It was emulsified and dispersed at pm.

To 55 g of this emulsion, 6 g of a 40% aqueous solution of urea, 2.5 g of a 10% aqueous solution of resorcin and 8 g of a 30% aqueous solution of formalin were sequentially added, and the mixture was heated and stirred at 60 ° C. for 2 hours at 1000 rpm to prepare a microcapsule solution. .

Preparation of photosensitive material 10 g of microcapsule liquid prepared as described above
Then, 0.8 g of a 20% triethanolamine aqueous solution was added to prepare a coating solution. This coating solution was applied onto a polyethylene terephthalate film so as to have a wet film thickness of 50 μm and dried to prepare a photosensitive material.

Preparation of image receiving material To 125 g of water, 11 g of 40% sodium hexametaphosphate aqueous solution was added, and further 34 g of zinc 3,5-di-α-methylbenzylsalicylate and 82 g of 55% calcium carbonate slurry were mixed and roughly dispersed by a mixer. The liquid was further dispersed with a Dynamill disperser to obtain 200
To 50 g, 6 g of 50% SBR latex and 55 g of 8% polyvinyl alcohol were added and mixed uniformly.

30 μm of this mixed solution on an art paper weighing 43 g / m ^2.
After uniformly coating so as to have a wet film thickness, the image receiving material was prepared by drying.

Image formation and its evaluation The light-sensitive material obtained as described above was exposed with a tungsten bulb at 200 lux for 1 second through a line drawing original having a width of 100 μm, and then heated on a hot plate heated to 125 ° C. for 10 seconds. did.

Then, stack the light-sensitive material and the image-receiving material together to 350 kg / c
When it was passed through an m ² pressure roller, a clear magenta positive image having gradation corresponding to the unexposed portion was obtained on the image receiving material.

The image receiving material was heated at 160 ° C. for 30 seconds.

As described above, the image obtained according to the image forming method of the present invention maintained a line width of 100 μm even after being left for 60 days, and the image was stable.

From the above results, it can be seen that the image obtained according to the present invention retains its sharpness even after long-term storage.

[Comparative Example 1] The photosensitive material and the image receiving material used in Example 1 were used and processed in the same manner as in Example 1 to form an image on the image receiving material.

When the image obtained on the image receiving material was left for 60 days without performing the heat treatment of Example 1, the line width of 100 μm expanded to about 130 μm and the contour became slightly blurred.

Example 2 Preparation of Photosensitive Material In the same manner as in Example 1 except that 1.07 g of the hydrazine derivative used in the preparation of the photosensitive composition of Example 1 was replaced by the same amount of the following hydrazine derivative. A light-sensitive material was prepared.

(Hydrazine derivative) Image formation and its evaluation The light-sensitive material obtained as described above was exposed at 200 lux for 1 second through a line drawing original having a width of 100 μm using a tungsten bulb, and then heated for 40 seconds on a hot plate heated to 125 ° C. did.

Then, the light-sensitive material and the image-receiving material used in Example 1 were superposed and passed through a 350 kg / cm ² pressure roller, and a clear positive magenta image having gradation corresponding to the unexposed portion was formed on the image-receiving material. Was obtained.

The image receiving material was heated at 140 ° C. for 30 seconds.

As described above, the image obtained according to the image forming method of the present invention maintained a line width of 100 μm even after being left for 60 days, and the image was stable.

[Comparative Example 2] The photosensitive material and the image receiving material used in Example 2 were used and processed in the same manner as in Example 2 to form an image on the image receiving material.

When the image obtained on the image receiving material was left for 60 days without the heat treatment of Example 2, the line width of 100 μm expanded to about 130 μm and the outline became slightly blurred.

[Example 3] Preparation of developer liquid To 125 g of water, 11 g of 40% sodium hexametaphosphate aqueous solution was added, and further 34 g of 3,5-di-α-methylbenzylsalicylate zinc and 82 g of 55% calcium carbonate slurry were mixed. , Coarsely dispersed with a mixer. The liquid was dispersed with a Dynamill disperser, and 6 g of 50% SBR latex and 55 g of 8% polyvinyl alcohol were added to 200 g of the obtained liquid and uniformly mixed to prepare a developer liquid.

Preparation of Photosensitive Material 5 g of the microcapsule solution prepared in Example 1 and 5.0 g of the above developer solution were mixed, and 0.8 g of 20% triethanolamine aqueous solution was added to this mixed solution to prepare a coating solution.
This coating solution was applied onto a polyethylene terephthalate film so as to have a wet film thickness of 50 μm and dried to prepare a photosensitive material.

Image formation and evaluation thereof The light-sensitive material obtained as described above was exposed using a tungsten electrode at 200 lux for 1 second through a line drawing original having a width of 100 μm, and then heated on a hot plate heated to 125 ° C. for 10 seconds. .

Then, when the photosensitive material was passed through a pressure roller of 350 kg / cm ² , a clear positive magenta image having gradation corresponding to the unexposed portion was obtained on the photosensitive material.

The above light-sensitive material was heated at 160 ° C. for 30 seconds.

As described above, the image obtained according to the image forming method of the present invention maintained a line width of 100 mm even after being left for 60 days, and the image was stable.

Comparative Example 3 Using the photosensitive material prepared in Example 1, Example 1
An image was formed on the light-sensitive material by processing in the same manner as in.

When the image obtained on the light-sensitive material was left for 60 days without being subjected to the heat treatment of Example 1, the line width of 100 mm spread to about 130 mm and the contour became slightly blurred.

Claims (10)

[Claims] 1. A silver halide having a photosensitive layer containing a silver halide, a reducing agent and a polymerizable compound on a support.
A light-sensitive material in which a reducing agent and a polymerizable compound are contained in light-sensitive microcapsules is imagewise exposed to form a latent image of silver halide, and the light-sensitive material is exposed at the same time as the imagewise exposure or after the imagewise exposure. 8
A heat development treatment is performed by heating at 0 to 200 ° C. for 1 second to 5 minutes, thereby polymerizing the polymerizable compound in the latent image-formed portion to form a photosensitive microcapsule in the latent image-formed portion. The unpolymerized polymerizable compound is transferred to the image receiving material by applying pressure in the state where the image receiving material is superposed on the photosensitive material which has been cured and subjected to heat development treatment, and the image receiving material is heated at 100 to 250 ° C. for 0.1 time. An image forming method characterized by heating for 100 seconds. 2. The heating temperature of the image receiving material is 120 to 2
The image forming method according to claim 1, wherein the temperature is 10 ° C. 3. The image forming method according to claim 1, wherein the image receiving material is provided on a photosensitive material as an image receiving layer. 4. A silver halide having a photosensitive layer containing a silver halide, a reducing agent and a polymerizable compound on a support,
A light-sensitive material in which a reducing agent and a polymerizable compound are contained in light-sensitive microcapsules is imagewise exposed to form a latent image of silver halide, and the light-sensitive material is exposed at the same time as the imagewise exposure or after the imagewise exposure. 8
A heat development treatment is performed by heating at 0 to 200 ° C. for 1 second to 5 minutes, thereby polymerizing the polymerizable compound in the portion where the latent image is not formed to cure the photosensitive microcapsules where the latent image is not formed. By pressing the image receiving material in a state of being superposed on the heat-developable photosensitive material, the unpolymerized polymerizable compound is transferred to the image receiving material, and the image receiving material is heated at 100 to 250 ° C. for 0.1 to 100 ° C. An image forming method characterized by heating for seconds. 5. The heating temperature of the image receiving material is 120 to 2
The image forming method according to claim 4, wherein the temperature is 10 ° C. 6. The image forming method according to claim 4, wherein the image receiving material is provided on a photosensitive material as an image receiving layer. 7. A silver halide, a reducing agent, a polymerizable compound, and a photosensitive layer containing two kinds of substances which cause a color reaction in a contact state on a support. The compound and one of the two kinds of substances that cause the color forming reaction are contained in the photosensitive microcapsules, and the other of the two kinds of substances that cause the color forming reaction are outside the photosensitive microcapsules. The existing light-sensitive material is exposed imagewise to form a latent image of silver halide, and the light-sensitive material is exposed at the same time as the imagewise exposure or after the imagewise exposure.
A heat development treatment is performed by heating at 0 to 200 ° C. for 1 second to 5 minutes, thereby polymerizing the polymerizable compound in the latent image-formed portion to form a photosensitive microcapsule in the latent image-formed portion. By pressing the light-sensitive material that has been cured and subjected to heat development treatment, two types of substances that rupture the uncured microcapsules and cause a color development reaction are brought into contact with each other, and the light-sensitive material is heated at 100 to 250 ° C. An image forming method characterized by heating for 1 to 100 seconds. 8. The image forming method according to claim 7, wherein the heating temperature at the time of finally heating the photosensitive material is 120 to 210 ° C. 9. A support having thereon a photosensitive layer containing a silver halide, a reducing agent, a polymerizable compound and two kinds of substances which cause a color-forming reaction in a contact state. The compound and one of the two kinds of substances that cause the color forming reaction are contained in the photosensitive microcapsules, and the other of the two kinds of substances that cause the color forming reaction are outside the photosensitive microcapsules. The existing light-sensitive material is exposed imagewise to form a latent image of silver halide, and the light-sensitive material is exposed at the same time as the imagewise exposure or after the imagewise exposure.
A heat development treatment is performed by heating at 0 to 200 ° C. for 1 second to 5 minutes, thereby polymerizing the polymerizable compound in the portion where the latent image is not formed to cure the photosensitive microcapsules where the latent image is not formed. By pressing the light-sensitive material subjected to the heat development treatment, two kinds of substances that rupture the uncured microcapsules and cause a color reaction are brought into contact with each other, and the light-sensitive material is heated at 100 to 250 ° C. for 0.1 An image forming method characterized by heating for 100 seconds. 10. A heating temperature at the time of finally heating the light-sensitive material is 120 to 210 ° C.
The image forming method described in the item.