JPH03181946A - Image forming method - Google Patents

Abstract

PURPOSE:To speed up image formation by previously forming imagewise cured parts by light and/or heat on a recording material and superposing this recording material and an image receiving material at a desired period, then heating the entire surface. CONSTITUTION:The recording layer of the recording material having the recording layer dispersed and disposed with many microcapsules contg. a polymerizable compd., sublimatable washing agent and photopolymn. initiator is irradiated imagewise with light to cure the polymerizable compd. in the microcapsules in the irradiated parts. The image receiving material is then superposed on the recording material and is heated in this state, by which the sublimatable washing agent is sublimated and transferred from the non-cured capsules onto the image receiving material and the colored images are formed. The images are formed by the rapid processing in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a method of forming colored images using dye transfer.

[Background of the Invention] In recent years, with the rapid development of the information industry, various information processing systems have been developed, and recording methods and devices suitable for each information processing system have also been developed and adopted. A thermal transfer recording method is known as one of the recording methods used for this purpose.

The thermal transfer recording method has recently been widely used because the apparatus used is lightweight, compact, noiseless, has excellent operability and maintainability, and can be easily produced in color. There are three main types of thermal transfer recording methods: thermal melting type and thermal transfer type. Among these, in the thermal transfer recording method, a dye-providing material having a dye-donating layer containing a binder and a heat-transferable dye is prepared on a support, and this dye-providing material is applied to a recording medium (image-receiving material). The layers are stacked so that they are in contact with each other, and heat is applied imagewise (in a pattern) from the support side of the dye-providing material to melt and soften the binder in the heat-applied area, and the binder melts according to the heat-applied pattern. A method is used in which a transferred image is obtained by transferring a heat-transferable dye from a portion to an image-receiving material. A typical example of the heat-transferable dye used here is a sublimable dye. This sublimable dye causes sublimation or diffusion in the medium by heating, and moves from the dye-providing material to the recording medium (image-receiving material).

JP-A-51-72518 and JP-A-58-21
The method disclosed in Japanese Patent No. 1498 uses a recording material in which a sublimable dye is encapsulated in microcapsules, and by introducing the microcapsules, the sublimable dye corresponding to the heated area can be more controlled. It is said that clear images can be obtained because the particles are transferred to the image-receiving material in the same state.

It is known that beautiful full-color images can be obtained using these heat transfer type thermal transfer recording methods, but in order to write image information by applying heat and obtain a full-color image, it is necessary to separate each color separately. Using the M recording material, there were disadvantages in that multiple treatments were required, the recording speed was slow due to the writing of information by heat, and it took a lot of time to obtain a desired colored image.

On the other hand, an image forming method using microcapsules containing a polymerizable compound is known.
No. 124343, JP 60264279 No. 1983
-7377 and Japanese Patent Publication No. 64-7378, a sheet (recording material) in which microcapsules containing a photopolymerizable composition and a coloring material are provided on a support is imagewise exposed to produce microcapsules. After imagewise curing, an image-receiving material is superimposed on this recording material, and pressure is applied to destroy the microcapsules in the unexposed area (uncured area), so that the uncured polymerizable composition is imagewise formed on the image-receiving material. A method of obtaining a colored image by transferring is disclosed.

On the other hand, an image forming method utilizing the photosensitivity of silver halide is also known. For example, in JP-A-61-69062 and JP-A-61-73145, photosensitive silver salt (silver halide), reducing agent, crosslinking compound (polymerizable compound)
A recording material (photosensitive material) comprising a support supporting a photosensitive layer further containing a binder or a color image forming substance is imagewise exposed to form a latent image of a photosensitive silver salt, and then, A method is described in which a polymerized cured product (high molecular compound) is formed in the area where the latent image has been formed by heating this.

When forming an image on an image-receiving material using the above-mentioned photosensitive material, the photosensitive material on which a polymer compound is imagewise formed on the photosensitive layer is superimposed on the image-receiving material, and the unpolymerized material is removed by applying pressure. A method is used in which a polymerizable compound is transferred onto an image-receiving material. In this case, a photosensitive material in which silver halide and a polymerizable compound are housed in microcapsules is preferably used (Japanese Patent Laid-Open No. 61-2757
No. 42 and No. 61-278849). According to this image forming method, a clear full-color image can be easily obtained by dry processing.

[Summary of the Invention] An object of the present invention is to provide a novel thermal transfer type thermal transfer recording method.

More specifically, it is an object of the present invention to provide a thermal transfer type thermal transfer recording method that uses sublimation dyes and can obtain colored images with simpler and faster processing.

The present invention imagewise imparts energy to a recording layer of a recording material having a recording layer in which a large number of microcapsules containing a polymerizable compound and a sublimable dye are dispersed.
Curing the polymerizable compound in the microcapsules in the energy-applying portion, and then heating the recording material with the image-receiving material superimposed on the recording material to sublimate and transfer the sublimable dye from the uncured capsules onto the image-receiving material; An image forming method characterized by forming a colored image is provided.

In a preferred embodiment of the above image forming method, light is imagewise applied to a recording layer of a recording material having a recording layer in which a large number of microcapsules containing a polymerizable compound, a sublimable dye, and a photopolymerization initiator are dispersed. The polymerizable compound in the microcapsules in the light-irradiated area is cured by irradiation, and then the recording material is heated with the image-receiving material superimposed on the recording material, thereby sublimating the sublimable dye from the uncured capsules into the image-receiving material. An example of an image forming method is to form a colored image by moving the object.

Furthermore, a recording layer of a recording material having a recording layer in which a large number of microcapsules containing a polymerizable compound, a silver halide, a reducing agent, and a sublimable dye are dispersed is irradiated with light in an imagewise manner, and at the same time Alternatively, heat development is then performed to harden the polymerizable compound in the microcapsules in the light irradiated area, and then the image receiving material is superimposed on the recording material and heated to receive the sublimable dye from the uncured capsules. Another preferred embodiment of the image forming method of the present invention is an image forming method characterized by forming a colored image by sublimating and moving onto a material.

When carrying out the image forming method of the present invention, it is preferable that the following requirements are satisfied.

(1) The sublimable dye is contained in a proportion of 0.5 to 50 parts by weight per 100 parts by weight of the polymerizable compound.

(2) The sublimation temperature of the sublimable dye is in the range of 100°C to 300°C (preferably 150 to 250°C).

(3) The sublimable dye is incompatible with the polymerizable compound.

(4) The polymerizable compound is an ethylenically unsaturated polymerizable compound.

(5) The image-receiving material has an image-receiving layer on a support, and the image-receiving layer contains a hydrophobic polymer.

(6) In a recording material containing a photopolymerization initiator or silver halide, two or more (more preferably three) types of sublimable dyes having different hues of microcapsules coexist in the recording layer. There is.

(7) In an image forming method using a recording material having a recording layer containing silver halide, a reducing agent, a polymerizable compound, and a sublimable dye on a support, microcapsules in the light irradiated area after light irradiation are used. Curing of the polymerizable compound is carried out simultaneously with or after thermal development.

(8) In a method in which curing of the polymerizable compound is carried out simultaneously with or after thermal development, the heating temperature for curing should be at least 20°C lower than the heating temperature for transfer of the sublimable dye.

[Effects of the Invention] According to the image forming method of the present invention, an image-like hardened portion is formed on a recording material in advance by light and/or heat, and the recording material is overlapped with an image-receiving material at a desired time. At the same time, by heating the entire surface, the sublimable dye present in the uncured portion can be sublimated, and a colored image of the dye can be formed on the image-receiving material. That is, according to the present invention, the sublimable dye can be transferred from the recording material to the image receiving material in a short time by heating the entire surface of the recording material after the formation of a polymer image. Compared to the conventional method of obtaining an image of dye by sequentially transferring it to the medium, image formation can be performed quickly.

Further, by coexisting two or more types of sublimable dye microcapsules with different hues in the recording layer, a color image (particularly a full color image) can be easily formed by a second image forming process.

Furthermore, unlike the conventional pressure transfer method, the method of the present invention does not form images by moving unpolymerized polymerizable compounds.
Zero adhesion between the photosensitive material and the image-receiving material (that is, a decrease in releasability between the photosensitive material and the image-receiving material) due to pressure does not occur.

Furthermore, since the dye image obtained by the method of the present invention is dyed onto the image-receiving layer, color transfer is less likely to occur.

In particular, good images can be obtained when an image receiving material having an image receiving layer containing a hydrophobic polymer substance is used.

[Detailed Description of the Invention] The recording material used in the present invention has a recording layer in which a large number of microcapsules containing a polymerizable compound and a sublimable dye are arranged in a dispersed manner. In addition to a polymerizable compound and a sublimable dye, the microcapsules constituting the recording layer of the recording material of the present invention contain energy (light energy, electron beam energy, etc.) applied imagewise to cause a curing reaction of the polymerizable compound. It is necessary to coexist with a useful polymerization accelerator (eg, a photopolymerization initiator, a combination of silver halide and a reducing agent) so that the polymer can be used efficiently.

The sublimable dye contained in the recording material used in the image forming method of the present invention is not particularly limited, and examples thereof include sublimable dyes belonging to known disperse dyes, basic dyes, oil-soluble dyes, etc. be able to.

In the present invention, the sublimable dye preferably has a molecular weight of 150 to 6,600, and is selected in consideration of sublimation temperature, hue, light resistance, solubility in a polymerizable compound, dispersibility, etc.

In the present invention, the dye is preferably incompatible with the polymerizable compound so that the dye sublimes efficiently during thermal transfer.

As the sublimable dye, for example, those commercially available under the following trade names can be suitably used.

Sumikaron Yellow E4GL, Dianix Yellow 8
2G-FS, Miketon Polyester Yellow 3GSL,
Kaya Set Yellow 937, Sumikaron Red EFBL
, Dianic Red ACE, Miketon Polyester Red FB, Kayaset Red 126, Miketon Fast Brilliant Blue B, Kayaset Blue 136, etc.

2 In addition, as a sublimable yellow dye, JP-A-59-78
No. 895, No. 60-28451, No. 60-28453
No. 60-53564, No. 61-148096,
No. 60-239290, No. 60-31565, No. 6
No. 0-30393, No. 60-53565, No. 60-2
No. 7594, No. 61-262191, No. 60-152
No. 563, No. 61-244596 and No. 62-19
It is also possible to use the sublimable yellow dyes described in each publication of No. 6186.

As a sublimable magenta dye, JP-A-60-22386
No. 2, No. 60-28452, No. 60-31563,
No. 59-78896, No. 60-31564, No. 80
-30391, 61227092, 61-22
No. 7091, No. 60-30392, No. 60-3039
No. 4, No. 60-131293, No. 61-227093
It is possible to use the dyes described in Japanese Patent No. 60-159091, No. 61-262190, and US Pat. No. 4,698,651. Furthermore, a dye represented by the following formula (described in Japanese Patent Application No. 62-220793) can also be used [In the above formula, R+ and R2 are each independently a hydrogen atom or a halogen atom. , alkyl group, cycloalkyl group, alkoxy group, aryl group, aryloxy group, aralkyl group, cyano group, acylamino group, sulfonylamino group, ureido group, alkylthio group, arylthio group, alkoxycarbonyl group, carbamoyl group, sulfamoyl group, Represents a monovalent group selected from the group consisting of an alkyl or arylsulfonyl group, an acyl group, and an alkyl group, and R3 and R4 are selected from the group consisting of an alkyl group, a cycloalkyl group, an aralkyl group, and an aryl group. R3 and R4 may be bonded to each other to form a ring, or R2 and R3 or R2 and R4 may be bonded to each other to form a ring, n represents an integer of O to 3 (provided that n=0 when R2 is a hydrogen atom), X, Y and Z are 5 hydrogen atom, alkyl group, aralkyl group, cycloalkyl group, aryl group , represents a group selected from the group consisting of an alkoxy group, an aryloxy group, and an amino group. ), and when X and Y are both present, the two R5s may be bonded to each other to form a saturated or unsaturated hydrocarbon ring. Furthermore, each of the above substituents may be further substituted with other substituents. ] 5 As sublimable cyan dyes, JP-A No. 59-78894, JP-A No. 59-227490, JP-A No. 60151098, JP-A No. 59-227493, JP-A No. 61-244594, JP-A No. 5
No. 9-227948, No. 60-131292, No. 60
-172591, 60-151097, 60-
No. 131294, No. 60-217266, No. 6031
No. 559, No. 60-53563, No. 61-25589
No. 7, No. 60-239289, No. 61-22993, No. 61-19396, No. 61-268493, No. 61-35994, No. 61-31467, No. 61-
No. 148269, No. 61-49893, No. 61-57
No. 651, No. 60-239291, No. 60-2392
No. 92, No. 61-284489, No. 62-19119
The dyes described in Publication No. 1 can be used. Furthermore, a dye represented by the following formula (described in Japanese Patent Application No. 176625/1986) can also be used.

6 [In the above formula, Q contains at least one nitrogen atom and represents an atomic group necessary to form a 5-membered or more nitrogen-containing heterocycle with the bonding carbon atom, and R1 is an acyl group, or an alkyl group, or represents an arylsulfonyl group, R12 is a hydrogen atom or has 1 to 1 carbon atoms
6 aliphatic group, R'' represents a hydrogen atom, a halogen atom, an alkoxy group, or an aliphatic group having 1 to 6 carbon atoms,
R" is a halogen atom, an alkoxy group, or a carbon number of 1 to 6
represents an aliphatic group, m represents an integer of 0 to 4, RI3 may be bonded with R" or R12, or R" to form a ring, 7 R'5 and R16 are hydrogen atoms, carbon Represents an aliphatic group or aromatic group of numbers 1 to 6, R'5 and RI6 may be bonded to each other to form a ring, and R'5 and/or R'6 are bonded to R'' Depending on the embodiment of each recording material, the above-mentioned sublimable dye may be included in the recording layer in a state of being encapsulated in microcapsules together with other essential components of the constituent components of that embodiment. ing.

The above-mentioned sublimable dye contains the sublimable dye in a polymerizable compound (
Usually, this polymerizable compound contains other essential components or optional components. ) and mixed to prepare a composition, and then the composition can be encapsulated in microcapsules by microencapsulating the composition according to a known microcapsule preparation method described below.

In the recording material used in the image forming method of the present invention,
The sublimable dye is 0.5 parts by weight per 100 parts by weight of the polymerizable compound.
It is preferably used in an amount of 8 to 50 parts by weight (more preferably 5 to 30 parts by weight).

There is no particular restriction on the polymerizable/sound material that can be used in the recording material used in the image forming method of the present invention, and various known polymerizable compounds can be used. However, since the recording material is used by heat treatment, it must have a high boiling point (for example, a boiling point of 80°C or higher) that is difficult to volatilize during heating.
It is preferred to use a compound of Furthermore, in the present invention, since the sublimable dye is immobilized by polymerization and curing of the polymerizable compound, it is preferable that the polymerizable compound is a crosslinkable compound having a plurality of polymerizable functional groups in the molecule. .

The polymerizable compounds that can be used in the recording material used in the image forming method of the present invention are described in the publications and application specifications related to the series of photosensitive materials mentioned above and below.

The polymerizable compound used in the recording material utilized in the image forming method of the present invention is generally a compound having addition polymerizability or ring-opening polymerizability. Examples of the compound having addition polymerizability include compounds having an ethylenically unsaturated group, and compounds having ring-opening polymerizability include compounds having an epoxy group, and compounds having an ethylenically unsaturated group are particularly preferred.

Compounds with ethylenically unsaturated groups that can be used in recording materials include acrylic acid and its salts, acrylic esters, acrylamides, methacrylic acid and its salts, methacrylic esters, methacrylamide, anhydrous Examples include maleic acid, maleic esters, itaconic esters, styrenes, vinyl ethers, vinyl esters, N-vinyl heterocycles, allyl ethers, allyl esters, and derivatives thereof.

Specific examples of the above polymerizable compounds include n-butyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, benzyl acrylate, furfuryl acrylate, ethoxyethoxyethyl acrylate, dicyclohexyloxyethyl Acrylate, nonylphenyloxyethyl acrylate, hexanediol diacrylate, butanediol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate,
Pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, polyoxyethylated bisphenol A diacrylate, 2-(2-hydroxy-
1,1-dimethylethyl)-5-hydroxymethyl-5
-ethyl-1,3-dioxane diacrylate, 2-(
2-hydroxy-1,1-dimethylethyl)-5,5-
Examples include dihydroxymethyl-1,3-dioxane triacrylate, triacrylate of propylene oxide adduct of trimethylolpropane, diacrylate of tricyclodecane dimethylol, polyacrylate of hydroxypolyether, 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 trimethacrylate. Examples include erythritol tetramethacrylate and polyoxyalkylenated bisphenol A dimethacrylate.

The above polymerizable compounds may be used alone or in combination of two or more. A photosensitive material using a combination of two or more types of polymerizable compounds is described in JP-A-62-210445. In addition, a substance in which a polymerizable functional group such as a vinyl group or a vinylidene group is introduced into the chemical structure of the above-mentioned reducing agent can also be used as the polymerizable compound.

The polymerizable compound is 0.5 g/5 to 5
It is preferable to apply in a range of 0 g/m''. A more preferable usage range is 2 g/rn' to 20 g/rr
i”.

2. As mentioned above, in addition to the polymerizable compound and the sublimable dye, the microcapsules constituting the recording layer of the recording material of the present invention contain energy applied imagewise to efficiently carry out the curing reaction of the polymerizable compound. It is necessary to coexist a polymerization accelerator such as a photopolymerization initiator and a combination of silver halide and a reducing agent so that the polymerization can be utilized.

Examples of photopolymerization initiators include α-alkoxyphenyl ketones, polycyclic quinones, benzophenones, and substituted benzophenones, xanthones, thioxanthones, halogenated compounds (e.g., chlorosulfonyl, chloromethyl, etc.). Aromatic compounds, chlorosulfonyl and chloromethyl heterocyclic compounds, chlorosulfonyl and chloromethylbenzophenones, and halogenated fluorenones, haloalkanes, α-halo α-phenylacetophenones), photoreducible dyes - reducible Redox couples, halogenated paraffins (e.g., brominated or chlorinated paraffins), benzoyl alkyl ethers, lofindimer3-/mercapto compound couples, and U.S. Patent 4.80
Examples include the cyan dye borate complex described in No. 0,149.

Specific examples of preferred photopolymerization initiators include 2゜2-dimethoxy-2-phenylacetophenone, 9.10-anthraquinone, benzophenone, Michler's ketone, 4,4
°-diethylaminobenzophenone, xanthone, chloroxanthone, thioxanthone, chlorothioxanthone, 2,4-diethylthioxanthone, chlorosulfonylthioxanthone, chlorosulfonylanthraquinone, chloromethylanthracene, chloromethylbenzothiazole, chlorosulfonylbenzoxazole, chloromethylquinoline, chloro Methylbenzophenone, chlorosulfonylbenzophenone, fluorenone, carbon tetrabromide, benzoin butyl ether, benzoin isopropyl ether, 2,2'-bis(θ-chlorophenyl)-4,4°
, a combination of 5°5'-tetraphenylbiimidazole and 2-mercapto-5-methylthio-1,3,4-thiasia 4 zole. As the photopolymerization initiator, the above-mentioned compounds may be used alone, or several types may be used in combination.

The photopolymerization initiator is 0.5 to 30% relative to the polymerizable compound.
It is preferable to use it within a range of % by weight. A more preferred usage range is 2 to 20% by weight.

Note that instead of coexisting a photopolymerization initiator, a photopolymerizable compound that exhibits photopolymerizability by itself may be used. Examples of photopolymerizable compounds include silicate esters of polyvinyl alcohol.

Blank space below 5 Next, a combination of silver halide and a reducing agent that can be used as a polymerization accelerator will be described below.

As the silver halide, any grains of silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodide, silver iodobromide, and silver chloroiodobromide can be used.

The halogen composition of the silver halide grains may be uniform or non-uniform on the surface and inside. Regarding silver halide grains having multiple structures with different compositions on the surface and inside, Japanese Patent Application Laid-open Nos. 57-154232 and 58-10853 disclose
No. 3, No. 59-48755, No. 59-52237, U.S. Patent No. 4433048 and European Patent No. 1
There are descriptions in each specification of No. 00984. Also, JP-A-62
Silver halide grains having a high proportion of silver iodide in the shell portion may be used, as in the photosensitive material described in Japanese Patent No. 183453.

There is also no particular restriction on the crystal habit of the silver halide grains. For example, tabular grains having an aspect ratio of 3 or more 6 may be used as in the photosensitive material described in JP-A-62-210455.

In addition, as the silver halide grains mentioned above, Japanese Patent Application Laid-Open No. 63-6
It is preferable to use silver halide grains having a relatively low fog value, such as the light-sensitive material described in Japanese Patent No. 8830.

Two or more types of silver halide grains having different halogen compositions, crystal habits, grain sizes, etc. can also be used together.

There are no particular restrictions on the grain size distribution of silver halide grains. For example, monodisperse silver halide grains having a substantially uniform grain size distribution may be used, as in the photosensitive material described in JP-A-62-210448.

The average grain size of the silver halide grains used is 0.00
Preferably in the range of 1 to 5 μm, preferably 0.001
More preferably, the range is from 2 μm to 2 μm.

The amount of silver halide contained in the recording layer is from 0.1 mg to 1 mg in terms of silver, including organic silver salts, which are optional components described below.
It is preferable to set it in the range of 0 g/rn'. In addition, when converting only silver halide into silver, Ig/
It is preferably less than d, and from 1 mg to somg/
A range of rn' is particularly preferable.

The reducing agent has a function of reducing silver halide and/or a function of promoting polymerization of a polymerizable compound. There are various types of reducing agents having the above functions. The above reducing agents include hydroquinones, catechols, p-
Aminophenols, p-phenylenediamines, 3-
Pyrazolidones, 3-aminopyrazoles, 4-amino-5-pyrazolones, 5-aminouracils, 4,5-
Dihydroxy-6-aminopyrimidines, reductones, amyl reductones, 0- or p-sulfonamidophenols, 0- or p-sulfonamidonaphthols, 2-sulfonamidoindanones, 4-sulfonamido-5-pyrazolones 3-sulfonamide indoles, sulfonamide pyrazolobenzimidazoles, sulfonamide pyrazolotriazoles, α-sulfo 8 noamide ketones, hydrazines, and the like. By adjusting the type, amount, etc. of the reducing agent, it is possible to polymerize the polymerizable compound in either the area where the silver halide latent image is formed or the area where no latent image is formed.

Regarding various reducing agents having the above functions, please refer to JP-A-61-183640, JP-A No. 61-188535, and JP-A-61-188535.
No. 1-228441, No. 6270836, No. 62-8
No. 6354, No. 6286355, No. 62-26404
Described in each publication such as No. 1 and No. 62-198849 (
(including those described as developing agents or hydrazine derivatives)
There is. Regarding the above reducing agent, T. James
Author “The Theory of the Photo
“graphic Process” 4th edition, 291-3
34 pages (1977), Research Disclosure Vol. 1.170. No. 17029, June 1978 (
9-15), and the same magazine Vol. 1.176, December 1978, No. 17643 (pages 22-31). Furthermore, as in the photosensitive material described in JP-A No. 62-210446, a reducing agent precursor capable of releasing the reducing agent under heating conditions or in contact with a base is used in place of the reducing agent. Good too. The reducing agents and reducing agent precursors described in the above-mentioned publications, specifications, and literature can also be effectively used in the recording material used in this specification. Therefore, the term "r-reducing agent" in this specification includes the reducing agents and reducing agent precursors described in each of the above-mentioned publications, specifications, and literatures. These reducing agents may be used alone, but as described in each of the above specifications, two or more types of reducing agents may be used in combination. When two or more types of reducing agents are used together, the interaction of the reducing agents is, first, to promote the reduction of silver halide (and/or organic silver salt) through so-called superadditivity; , causing polymerization of the polymerizable compound via a redox reaction with other reducing agents coexisting with an oxidized form of the first reducing agent generated by reduction of silver halide (and/or organic silver salt); (or suppressing polymerization), etc. However, in actual use, the reactions 0 as described above may occur simultaneously, so it is difficult to specify which effect is responsible.

Specific examples of the reducing agent include pentadecylhytroquinone, 5-t-butylcatechol, p(N,N-diethylamino)phenol, 1-phenyl-3-pyrazolidone, 5-phenyl-3-pyrazolidone, 1.5- diphenyl-3-pyrazolidone, 1-phenyl-4-methyl-4
-Hydroxymethyl-3-pyrazolidone, 1-phenyl4-methyl-4-heptadecylcarbonyloxymethyl-3-pyrazolidone, 2-phenylsulfonylamino-
4-hexadecyloxy-5-t-octylphenol, 2-phenylsulfonylamino-4-t-butyl-5
-hexadecyloxyphenol, 2-(N-butylcarbamoyl)4-phenylsulfonylaminenaphthol, 2(N-methyl-N-octadecylcarbamoyl)4
-Sulfonylaminonaphthol, 1-acetyl-2-phenylhydrazine, 1-formyl-2-(2-methoxyphenyl)hydrazine, 1-1 formyl-2-(2-chlorophenyl)hydrazine, 1
-Formyl-2-(2-butoxyphenyl)hydrazine, 1-(3,5-dichlorobenzoyl)-2-phenylhydrazine, 1-(3,5-dichlorobenzoyl)-2-
(2-chlorophenyl)hydrazine, 1-acetyl-2
-((p or O)-aminophenyl)hydrazine, 1
-formyl-2-((p or 0)-aminophenyl)
Hydrazine, 1-acetyl-2-((p or O)-methoxyphenyl)hydrazine, 1-lauroyl-2-(
(p or 0)-aminophenyl)hydrazine, 1-trityl-2-(2,6 dichloro-4-cyanophenyl)
Hydrazine, l-trityl-2-phenylhydrazine, 1
-Phenyl-2-(2,4,6-1-dichlorophenyl)hydrazine, 1-(2-(2,5-di-t-pentylphenoxy)butyroyl)-2-((p or 0)-
aminophenyl)hydrazine, 1-(2(2,5-di-
t-pentylphenoxy)butyroyl)-2-((p or O)-aminophenyl)hydrazine pentadecylfluorocaprylate,
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 0)-methoxyphenyl)hydrazine, 1-(methoxycarbonylbenzohydryl)-2
-phenylhydrazine, 1-formyl2-[4-(2
-(2,4-di-t-pentylphenoxy)butyramido)phenyl]hydrazine, 1-acetyl-2-[4-
(2-(2,4-di-t-pentylphenoxy)butyramido)phenyl]hydrazine, 1-trityl-2[(
2,6-dichloro-4-(N,N-di-2ethylhexyl)carbamoyl)phenyl]hydrazine, 1-(methoxycarbonylbenzohydryl)-2-(2,4-dichlorophenyl)hydrazine, 1-trityl-2 −[(2
-(N-ethyl 3 -N-octylsulfamoyl)-4-methanesulfonyl)phenyl]hydrazine, 1-benzoyl-2-tritylhydrazine, 1-(4-butoxybenzoyl)-2
-tritylhydrazine, 1-(2,4-dimethoxybenzoyl)-2-tritylhydrazine, 1-(4-dibutylcarbamoylbenzoyl)-2-tritylhydrazine, and 1-(1-naphthoyl)-2-1-lythylhydrazine etc. can be mentioned.

The above reducing agent is 0.1 to 1 mol per mole of silver (including the above-mentioned silver halide and optional organic silver salt).
It is preferable to use it in a range of 500 mol%.

At least the essential components constituting the recording layer of the recording material used in the present invention are encapsulated in microcapsules.

There are no particular restrictions on the wall material that constitutes the outer shell of the microcapsules. Regarding photosensitive materials using microcapsules having outer shells made of polyamide resin and/or polyester resin, 4 JP-A-62-209437 discloses microcapsules having outer shells made of polyurea resin and/or polyurethane resin. Regarding photosensitive materials using
JP-A-209438 describes a photosensitive material using microcapsules having an outer shell made of amino aldehyde resin, and JP-A-62-209439 describes a photosensitive material using microcapsules having an outer shell made of gelatin. For a photosensitive material using microcapsules having an outer shell made of epoxy resin, see JP-A No. 62-209441.
Regarding a photosensitive material using microcapsules having a composite resin outer shell containing a polyamide resin and a polyurea resin, Japanese Patent Application Laid-Open No. 62-209447 describes a photosensitive material using a microcapsule having a composite resin outer shell containing a polyurethane resin and a polyester resin. For photosensitive materials, see JP-A-62-20
Each of these is described in Publication No. 9442.

In addition, when using aldehyde-based microcapsules, it is preferable to keep the amount of residual aldehyde below a certain value, as in the photosensitive material described in JP-A No. 63-32535.

Note that when silver halide is contained in microcapsules, it is preferable that silver halide be present in the wall material constituting the outer shell of the microcapsules. A photosensitive material containing silver halide in the wall material of microcapsules is described in JP-A-62-169147. Further, two or more microcapsules containing at least different components among the components encapsulated in the microcapsules of silver halide, reducing agent, polymerizable compound, and sublimable dye may be used in combination. In particular, when forming a color image consisting of a plurality of colors, it is preferable to use two or more types (three or more types in the case of full color) of microcapsules containing different sublimable dyes in different hues. In that case, silver halide sensitized to exhibit photosensitivity corresponding to the hue of the sublimable dye is used. Note that a photosensitive material using two or more types of microcapsules is described in JP-A-62-198850.

The average particle diameter of the microcapsules is preferably 3 to 20 μm. It is preferable that the particle size distribution of the microcapsules is uniformly distributed over a certain value, as in the photosensitive material described in JP-A No. 63-5334. In addition, the film thickness of the microcapsule is
As in the photosensitive material described in Publication No. 6, it is preferable that the particle diameter is within a certain range.

In addition, when storing silver halide in microcapsules, the average particle size of the silver halide grains mentioned above is preferably one-fifth or less, and preferably one-tenth or less, of the average size of the microcapsules. is even more preferable. A uniform and smooth image can be obtained by setting the average particle size of the silver halide grains to one-fifth or less of the average size of the microcapsules.

The recording material used in the present invention has a recording layer containing each component provided on a support. There are no particular restrictions on this support, but it is preferably made of a material that can withstand heating temperatures.

Materials that can be used for the support include glass, paper, woodfree paper, coated paper, cast coated paper, synthetic paper, baryta paper, metals and their analogs, polyester, cellulose acetate, cellulose ester, polyvinyl acetal, polystyrene, Examples include films such as polycarbonate and polyethylene terephthalate, and papers laminated with resin materials and polymers such as polyethylene.

In addition, when the support is made of a porous material such as paper, it is necessary to obtain a certain level of smoothness according to the waviness-based method, as in the case of the support used in the photosensitive material described in JP-A No. 62-209529. It is preferable to have. In addition, when using a paper support, a paper support with low water absorption such as the photosensitive material described in JP-A No. 63-38934, a photosensitive material described in JP-A No. 63-47754, etc. Paper support having a certain Bekk smoothness, JP-A-63-8133
A paper support with a low shrinkage rate such as the photosensitive material described in JP-A-63-81340, a paper support with low air permeability such as the photosensitive material described in JP-A-63-81340, JP-A-63-9
A paper support having a pH value of 5 to 9, such as the photosensitive material described in Japanese Patent No. 7941, can also be used.

Space below 9 The recording material using the microcapsules containing the silver halide, reducing agent, polymerizable compound, and sublimable dye described above may contain any other components.

Optional components that can be included in the recording layer include sensitizing dyes, organic silver salts, radical generators, various image formation accelerators, thermal polymerization inhibitors, development stoppers, fluorescent whitening agents, and anti-fading agents. dyes or pigments for preventing halation or irradiation, pigments that decolorize when heated or exposed to light, matting agents, anti-smudge agents, plasticizers, water release agents, binders, photoinitiators, polymerizable compounds. Examples include solvents and water-soluble vinyl polymers.

The sensitizing dye that can be used in the recording material is not particularly limited, and silver halide sensitizing dyes known in the photographic technology can be used. The above-mentioned sensitizing dyes include methine dyes, cyanine dyes, merocyanine dyes, complex cyanine dyes, holopolar cyanine dyes, hemicyanine dyes,
Includes styryl dyes and hemioxonol dyes. These sensitizing dyes may be used alone or in combination. Especially when the purpose is supersensitization,
A common method is to use a combination of sensitizing dyes. In addition, a dye that itself does not have a spectral sensitizing effect, or a substance that does not substantially absorb visible light but exhibits supersensitization may be used in combination with the sensitizing dye. The amount of the sensitizing dye added generally ranges from about 10<-8> to 10<-2> mol per 1 mol of silver halide.

The above-mentioned sensitizing dye is preferably added at the stage of preparing the silver halide emulsion. Regarding a light-sensitive material obtained by adding a sensitizing dye at the stage of forming silver halide grains, JP-A-62-947 discloses that a sensitizing dye is added to a silver halide emulsion after the formation of silver halide grains. Regarding the photosensitive materials obtained by adding them in the preparation stage, JP-A-62-
Each of these is described in JP-A No. 210449. Further, specific examples of sensitizing dyes that can be used in light-sensitive materials are also disclosed in the above-mentioned JP-A-62-947 and JP-A-62-210.
It is described in Publication No. 449. Furthermore, an infrared-sensitive sensitizing dye may be used in combination, as in the photosensitive material described in JP-A-63-184738.

Addition of organic silver salts to recording materials is particularly effective in thermal development processing. That is, when heated to a temperature of 80° C. or higher, the organic silver salt is considered to participate in an oxidation-reduction reaction using the latent image of silver halide as a catalyst. In this case, the silver halide and the organic silver salt are preferably in contact or in close proximity. Examples of the organic compound constituting the organic silver salt include aliphatic or aromatic carboxylic acids, thiocarbonyl group-containing compounds having a mercapto group or α-hydrogen, and imino group-containing compounds. Among them, benzotriazole is particularly preferred. The above organic silver salt is generally 0.01 to 10 mol, preferably 0.01 mol per mol of silver halide.
It is used in a range of 1 mole to 1 mole. Note that the same effect can be obtained by adding an organic compound (for example, benzotriazole) constituting the organic silver salt to the recording layer instead of the organic silver salt. For photosensitive materials using organic silver salts, see JP-A-62-
There is a description in Publication No. 3246. The organic silver salt as described above is preferably used in an amount of 0.1 to 10 mol, more preferably 0.01 to 1 mol, per mol of silver halide.

A radical generator that participates in the above-mentioned polymerization promotion (or polymerization inhibition) reaction of the reducing agent may be added to the recording layer.

A photosensitive material using silver triazene as the radical generator is described in JP-A-6219563Q, and a photo-sensitive material using silver diazotate is described in JP-A-62-1.
95640, and Japanese Patent Application Laid-open No. 195641/1983 describes a photosensitive material using an azo compound.

Various image formation accelerators can be used in the recording material. The image formation accelerator has functions such as promoting the redox reaction between silver halide (and/or organic silver salt) and a reducing agent. From the viewpoint of physicochemical functions, image formation accelerators include bases, base pre-cursors, oils, surfactants, compounds with anti-fogging functions and/or development accelerating functions, thermal solvents, and oxygen removal functions. It is further classified into compounds with However, these substance groups generally have multiple functions and usually have some of the above-mentioned promoting effects. Therefore, the above classification is for convenience, and in reality, one compound often has multiple functions.

Examples of various image formation accelerators are shown below.

The light-sensitive material of the present invention may contain a base or a base precursor as an image formation accelerator.

Preferred bases and base precursors include inorganic bases and organic bases, or base precursors thereof (decarboxylation type, thermal decomposition type, reactive type, complex salt forming type, etc.).

Preferred base precursors include JP-A-59-18
No. 0549, No. 59-180537, No. 59-195
No. 237, No. 61-32844, No. 61-36743
No. 61-511404, No. 61-52638, No. 61-52639, No. 61-53631, No. 61-53634, No. 61-
No. 53635, No. 61-53636, No. 61-536
No. 37, No. 61-53638, No. 61-53639, No. 61-53640, No. 61-55644, No. 6
No. 1-55645, No. 61-55646, No. 61-8
No. 4640, No. 61-107240, No. 61-219
No. 950, No. 61-251840, No. 61-2525
No. 44, No. 61-313431, No. 63-31674
No. 0, No. 64-68746 and patent application No. 62-209
Salts of organic acids and bases that are decarboxylated by heating as described in each publication No. 138, and JP-A-59-157637,
Examples include compounds that eliminate bases by heating as described in Publications No. 59-166943 and No. 63-96159.

The base precursor of the present invention is 50°C to 20°C.
It is preferable to release the base at 0°C, and between 80°C and 18°C.
It is more preferable to release at 0°C.

5 Furthermore, a method of releasing a base using a reaction is described in Japanese Patent Application Laid-Open No. 63-25208 and Japanese Patent Application No. 63-187803. Furthermore, a method of generating a base by electrolysis is described in JP-A-61-232451.

The base or base precursor can be used in the photosensitive material in a wide range of amounts. The base or base precursor is suitably used in an amount of not more than 100% by weight of the coating film of the photosensitive layer, and more preferably in a range of 0.1% 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.

When using a base or base precursor in a photosensitive material,
A base or base precursor may be present outside the microcapsule.

Methods for incorporating bases or base precursors outside microcapsules include JP-A-62-209521 and JP-A-62-209521;
No. 2-209522, No. 62-209526, No. 63
-65437, 63-6 97943, 62-209523, 62-25
No. 3140 and No. 63-32546.

Also, the base or base precursor may be housed in photosensitive microcapsules. A method for incorporating a base precursor into a capsule is described in Japanese Patent Application Laid-Open No. 64-32251.
It may be introduced directly into a polymerizable compound in the form of a solid dispersion as described in Japanese Patent Application No. 63-92686 and Japanese Patent Application No. 63-218964 and the present applicant.
As stated in the specification of the patent application (A) filed on April 22nd under the title "Photosensitive material", the base precursor is introduced in the form of emulsification in the polymerizable compound while being dispersed in water. You may do so.

Specific examples of these bases and base precursors are shown below, but are not limited thereto.

7 8 (4) 9 (6) 0 (10) (11) 1 2 2 As the oil, a high boiling point organic solvent used as a solvent for emulsifying and dispersing hydrophobic compounds can be used.

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

A compound having an antifogging function and/or a development accelerating function can be used for the purpose of obtaining a clear image (an image with a high S/N ratio) having a high maximum density and a low minimum density. Note that a photosensitive material using an antifoggant as a compound having an antifogging function and/or a development accelerating function is described in JP-A-62-151838, and a photosensitive material using a compound having a cyclic amide structure is described in JP-A-62-151838. Regarding photosensitive materials using thioether compounds, JP-A-6T
2-151842 for photosensitive materials using polyethylene glycol derivatives; 2 JP-A-62-151843 for photosensitive materials using thiol derivatives; JP-A-62151844 for photosensitive materials using thiol derivatives; For photosensitive materials using sulfonamide derivatives, see JP-A No. 62-178232, and for photosensitive materials using sulfonamide derivatives, see JP-A No. 62-1834.
No. 50 describes a photosensitive material using a quaternary ammonium salt, and JP-A-63-91653 describes a photosensitive material using a quaternary ammonium salt.

Useful examples of the thermal solvent include compounds that can serve as solvents for reducing agents, and compounds with high dielectric constants that are known to accelerate the physical development of silver salts. Useful thermal solvents include:
Polyethylene glycols described in U.S. Patent No. 3,347,675, derivatives such as oleic acid esters of polyethylene oxide, beeswax, monostearin, -5O
Compounds with a high dielectric constant having 2- and/or -CO- groups, polar substances described in US Pat. Diol, methyl anisate, biphenyl perate, etc. are preferably used. Incidentally, a photosensitive material using a heat solvent is described in JP-A-62-86355.

A compound having an oxygen removing function can be used for the purpose of eliminating the influence of oxygen (oxygen has a polymerization inhibiting effect) during development. Examples of compounds having an oxygen removing function include compounds having two or more mercapto groups. Note that a photosensitive material using a compound having two or more mercapto groups is described in JP-A-62-209443.

A development stopper that can be used in recording materials is a compound that neutralizes the base or reacts with the base to reduce the base concentration in the film and stop development, or a compound that interacts with silver and silver salts to stop the development after proper development. It is a compound that suppresses development. Specifically, acid precursors that release an acid when heated, electrophilic compounds that cause a substitution reaction with a coexisting base when heated, nitrogen-containing heterocyclic compounds, mercapto compounds, etc.
4 I can get it. Examples of acid precursors include JP-A-60-
Examples thereof include oxime esters described in JP-A No. 108837 and JP-A No. 60-192939, and compounds that release an acid by Rossen rearrangement described in JP-A No. 60-230133.

Examples of electrophilic compounds that undergo a substitution reaction with a base upon heating include compounds described in JP-A-60-230134.

A dye or pigment may be added to the recording layer of the recording material for the purpose of preventing halation or irradiation. Note that JP-A-63-29748 describes a photosensitive material in which a white pigment is added to the photosensitive layer for the purpose of preventing halation or irradiation.

Further, a pigment having a property of decolorizing by heating or light irradiation may be included in the microcapsules. The dye having the property of being decolored by heating or light irradiation can function as a yellow filter in conventional silver salt photography. A photosensitive material using a dye having the property of being decolored by heating or light irradiation as described above is described in JP-A-63-97940.

The anti-smudge agent used in the recording material is preferably a particulate material that is solid at room temperature. As a specific example, British Patent No. 1
Starch particles described in the specification of No. 232347, fine polymer powders described in the specification of US Pat. No. 3,625,736, etc., microcapsule particles containing no color former as described in the specification of British Patent No. 1,235,991, etc., and US Pat. No. 2,711,375. Examples include inorganic particles such as cellulose fine powder, talc, kaolin, bentonite, waxite, zinc oxide, titanium oxide, and alumina.

The average particle size of the above particles is 3 in volume average diameter.
The range is preferably from 50 μm to 50 μm, and more preferably from 5 to 40 μm. It is more effective for the particles to be larger than microcapsules.

Binders that can be used in the recording material can be contained in the recording layer alone or in combination. It is preferable to use a mainly hydrophilic binder. Hydrophilic binders are typically transparent or translucent, such as natural substances such as gelatin, gelatin derivatives, cellulose derivatives, starch, gum arabic, etc., and polyvinyl alcohol, polyvinylpyrrolidone, acrylamide polymers, etc. Contains synthetic polymeric materials such as water-soluble polyvinyl compounds.

Other synthetic polymeric substances include dispersed vinyl compounds in the form of latexes, which increase the dimensional stability of photographic materials, among others. Incidentally, a photosensitive material using a binder is described in JP-A-61-69062. Furthermore, a photosensitive material using a binder together with microcapsules is described in JP-A-62-209525.

The recording layer of the recording material can contain the photopolymerization initiator described above. The photopolymerization initiator can be used in a system for polymerizing the polymerizable compound in the area where the silver halide latent image is not formed (Japanese Patent Application No. 1-27175).

When a solvent for a polymerizable compound is used in the recording material, it is preferable to encapsulate it in a microcapsule separate from the microcapsule containing the polymerizable compound. Regarding photosensitive materials using organic solvents that are miscible with polymerizable compounds encapsulated in microcapsules, Japanese Patent Laid-Open No. 62
There is a description in Publication No.-209524.

A water-soluble vinyl polymer may be adsorbed onto the silver halide grains described above. Regarding photosensitive materials using water-soluble vinyl polymers as mentioned above, Japanese Patent Application Laid-Open No. 63-9165
There is a description in Publication No. 2.

In addition to those mentioned above, examples of optional components that can be included in the recording layer and how they are used can be found in the application specifications and research papers related to the above-mentioned series of photosensitive materials.
Disclosure Magazine Vol.

No. 17029, June 1978 (pages 9-15).

It is preferable that the recording layer of the recording material made of the above-mentioned components has a pH value of 7 or less, as in the photosensitive material described in JP-A-62-275235.

8 Layers that can be optionally provided on the recording material include a heating layer, an antistatic layer, an anticurl layer, a release layer, a cover sheet or protective layer, a layer containing a base or a base precursor, a base barrier layer, and an antihalation layer. (colored layer), etc.

Regarding photosensitive materials using a heat generating layer, Japanese Patent Application Laid-open No. 1983
For photosensitive materials provided with a cover sheet or a protective layer, see JP-A No. 62-210447, and for photosensitive materials provided with a layer containing a base or base precursor, see JP-A No. 62-253140. A photosensitive material provided with a colored layer as an antihalation layer is described in JP-A-63-101842. Further, a photosensitive material provided with a base barrier layer is also described in the above-mentioned Japanese Patent Application Laid-Open No. 62-253140. Furthermore, examples of other auxiliary layers and their usage are also described in the applications relating to the above-mentioned series of light-sensitive materials.

9 Next, the image receiving material will be explained.

As the support for the image-receiving material, the supports used for the photosensitive materials described above can be used. Note that when a porous material such as paper is used as the support for the image-receiving material, it is preferable that the support has a certain level of smoothness as in the image-receiving material described in JP-A-62-209530. Furthermore, regarding image-receiving materials using transparent supports, Japanese Patent Application Laid-Open No. 62-20
There is a description in Publication No. 9531.

Image-receiving materials generally have an image-receiving layer on a support.

The image-receiving layer can be constructed in any desired form using various compounds.

The image-receiving layer is preferably composed of a layer containing a hydrophobic polymer so that the sublimated dye is efficiently dyed.

Typical examples of polymers that can accept sublimable dyes include the following resins.

(a) Those having an ester bond Dicarboxylic acid components such as terephthalic acid, isophthalic acid, and succinic acid (these dicarboxylic acid components may be substituted with sulfo groups, carboxy groups, etc.) and ethylene glycol, diethylene glycol, Polyester resin obtained by condensation of propylene glycol, neopentyl glycol, bisphenol A, etc.:
Polyacrylic acid ester resin or polymethacrylic acid ester resin such as polymethyl methacrylate, polybutyl methacrylate, polymethyl acrylate, polybutyl acrylate; polycarbonate resin: polyvinyl acetate resin: styrene acrylate resin; vinyl toluene acrylate resin, etc. Specifically, JP-A-59-1013
Examples include those described in No. 95, No. 63-7971, No. 63-7072, No. 63-7973, and No. 60-294862. Also, as a commercially available product, Byron 290 manufactured by Toyobo ■. Byron 200, Byron 28
0, Byron 300, Byron 103, Byron GK-
14.0. ATR-2009, ATR-20 manufactured by Kao ■
10 etc. can be used.

(b) Those with urethane bonds 1 polyurethane resin, etc.

(c) Those with an amide bond polyamide resin, etc.

(d) Those with urea bonds urea resin etc.

(e) Those with a sulfone bond polysulfone resin, etc.

(f) Others having highly polar bonds, such as polycaprolactone resin, styrene-maleic anhydride resin, polyvinyl chloride resin, polyacrylonitrile resin, etc.

In addition to the synthetic resins mentioned above, mixtures or copolymers thereof can also be used.

The image-receiving layer having the above structure is formed by preparing a coating solution in which arbitrary components such as the above-mentioned resin and surfactant are dissolved using an appropriate solvent, and coating this on a support and drying it. be able to.

2 Next, the image forming method of the present invention will be described.

In the present invention, a known method using heat or light (including an electron beam) can be used to imagewise apply energy to the recording layer.

For example, as a method for exposing a recording material containing silver halide and a reducing agent, a method is generally used in which 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 depend on the wavelength at which the silver halide is sensitive (if dye sensitization is performed, the sensitized wavelength),
Can be selected depending on sensitivity.

Types of light sources that can be used include, for example, sunlight, strobes, flashes, tungsten lamps, mercury lamps, halogen lamps such as iodine lamps, xenon lamps, laser beams, CRT light sources, plasma light sources, fluorescent tubes, light emitting diodes, etc. I can do it. Also, LCD
It is also possible to use an exposure means that combines a micro-shutter array using (liquid crystal) or PLZT (lead titanium zirconate doped with lanthanum) and a linear light source or a planar light source.

When using a recording material containing silver halide and a reducing agent, simultaneously with the imagewise exposure or after the imagewise exposure,
Perform development processing. As for the development process,
Although a development process using a developer described in JP-A No. 149 and the like may be performed, the method of performing a heat development process described in JP-A-61-69062 mentioned above is simple and preferable.

As the heating method in the above heat development treatment, various conventionally known methods can be used. For example, the photosensitive material may be provided with a heating layer and used as a heating means, as in the photosensitive material described in Japanese Patent Application Laid-Open No. 61-294434. Further, as in the image forming method described in JP-A-62-210461, heat development may be carried out while suppressing the amount of oxygen entering the photosensitive layer. The heating temperature is preferably 20°C or more lower than the heating temperature for sublimable dye migration, and generally ranges from 50°C to 15°C.
It is in the range of 0°C. The heating time is generally 1 second or more,
Preferably, it ranges from 1 second to 5 minutes, more preferably from 1 second to 1 minute. Furthermore, as in the image forming method described in Japanese Patent Application No. 1-3282, the above development is carried out by including a liquid (preferably water) in the photosensitive layer in an amount of 10 to 400% by weight of the polymerizable compound. The heat treatment may be performed at a temperature of 50° C. or higher.

Note that, instead of including the base or base precursor described later in the recording material, the development treatment may be performed while or immediately after adding the base or base precursor to the recording layer. As a method for adding a base or a base precursor, a sheet containing a base or a base precursor (
The method using a base sheet) is the easiest and preferred.

An image forming method using the above base sheet is described in JP-A-63-32546.

The heat development treatment is performed as described above, and the polymerizable compound in the portion where the silver halide latent image is formed can be polymerized.

Next, the recording material on which the polymer image has been formed as described above is overlapped with the image-receiving material, and heated in this state to sublimate the sublimable dye contained in the uncured portion of the recording layer and transfer it to the surface of the image-receiving material. and thus form a dye image on the image-receiving material. In this operation, the unpolymerized polymerizable compound is not substantially transferred onto the image-receiving material.

In the present invention, the heating temperature is within the sublimation temperature range of the sublimable dye used. Specifically, from 100℃ to 3
The temperature is preferably in the range of 00°C, more preferably in the range of 150°C to 250°C. Further, the heating time is 0.1 seconds or more, preferably 1 second to 1 minute.

Further, as the heating method, the heating method described above can be used.

By using the image forming method of the present invention, it is possible to form various images (analog images, digital images). The image forming method of the present invention can be applied to black-and-white or color photographing and printing photosensitive materials, printing photosensitive materials, printing plates, X-ray photosensitive materials, medical photosensitive materials (for example, ultrasonic diagnostic CRT photosensitive materials), computer It can be used for many purposes such as graphic hard copy photosensitive materials and copying machine photosensitive materials.

6 The present invention will be explained in more detail with the following examples. However, the present invention is not limited to these.

[Example 1] [Preparation of recording material] To 81.8 g of the following polymerizable compound of Macrocapsule A (trade name: Kayarad R604, manufactured by Nippon Kayaku ■), 8.2 g of the following yellow sublimable dye and chloride were added. 20 g of methylene was added and mixed.

(Polymerizable compound) (Yellow sublimable dye) 7 Add a photopolymerization initiator (trade name: Irgacure 6) to the above mixture.
51, manufactured by Ciba Geigy (■)) and 4.5 g of an isocyanate compound (trade name: Takenate DIION, manufactured by Takeda Pharmaceutical Company (■)) were dissolved. This mixture was adjusted to pH 6.
It was added to 210 g of a 10% aqueous solution of sodium salt of polyvinylbenzenesulfonic acid (trade name: Parsa TL-502, manufactured by National Starch Co., Ltd.) adjusted to 0. The mixture was stirred to obtain an emulsion in the form of an O/W emulsion.

Separately, 21.6 g of a 37% formaldehyde aqueous solution and 70 g of distilled water were added to 13.2 g of melamine, heated to 60° C., and stirred for 30 minutes to obtain a transparent aqueous solution of melamine/formaldehyde initial condensate.

81 g of an aqueous solution of this initial condensate was added to the above O/W type emulsion, and the pH was adjusted to 6.0 using a 20% aqueous solution of phosphoric acid.
Adjusted to 0. Next, this was heated to 60° C. and stirred for 90 minutes, and then 27 g of a 40% urea aqueous solution was added, and the pH was similarly adjusted to 3.5 using the above phosphoric acid aqueous solution. The thus obtained dispersion was further stirred at 60° C. and 1000 revolutions per minute for 40 minutes, and finally the pH was adjusted to 6.5 and cooled to room temperature to prepare a microcapsule dispersion.

A coating solution was prepared by adding 30 g of the above microcapsule dispersion, 4 mfi of the following 5% aqueous surfactant solution, and 40 g of water.

This coating liquid was applied onto a polyethylene terephthalate (support) having a thickness of 100 μm to a wet film thickness of 50 μm, and dried to prepare a recording material.

(Surfactant) 9 This coating liquid was applied onto a 150 μm thick synthetic paper (support) (product name: YUPO-FPG-150, manufactured by Tamago Yuka ■) using a wire bar so that the dry thickness was 10 μm. An image-receiving material was prepared. In addition, after drying with a dryer, dry in an oven at a temperature of 100℃ for 30 minutes.
I went for a minute.

Iris? 20g of polyester resin (product name:
Byron 280, manufactured by Toyobo ■) Amino-modified silicone oil 0.5g (KF-857, manufactured by Shin-Etsu Silicon ■) Epoxy-modified silicone oil 0.5g (KF-1
00T, manufactured by Shin-Etsu Silicon ■) Methyl ethyl ketone
85ml toluene
85mj2 cyclohexanone 30m
jJ The recording material obtained above was imagewise exposed for 10 seconds from a distance of 30 cm using a 200 W high-pressure mercury lamp, and then
This is superimposed on the image receiving material, and in this state a heat roller (
The mixture was heated at 165°C for 20 seconds. Thereafter, when the recording material was peeled off from the image-receiving material, a clear yellow positive image was obtained on the image-receiving material.

[Example 2] [Preparation of recording material] The recording material was prepared in the same manner as in Example 1, except that the following cyan sublimation dye was used instead of the yellow sublimation dye in the preparation of the recording material in Example 1. Created.

(Cyan sublimable dye) [Image formation and evaluation thereof] The image forming method according to the present invention was carried out and evaluated in the same manner as in Example 1 using the recording material obtained above. A clear positive cyan image was obtained.

1 [Example 3] [Preparation of recording material] Halogen gelatin aqueous solution (20 g of gelatin in 1600 mj2 of water)
Add 0.5 g of sodium chloride and adjust the pH to 3 with IN sulfuric acid.
, 5 and kept at 45°C), 200 ml of an aqueous solution containing 71 g of potassium bromide and a silver nitrate aqueous solution (
At the same time, 0.59 mol of silver nitrate dissolved in 200 ml of water was added at an equal flow rate over 30 minutes. One minute after this addition is finished, add 0 of the following sensitizing dye (1).
．． 5% methanol solution 48ml! , and 100 ml of an aqueous solution containing 3.65 g of potassium iodide from 15 minutes after addition of the sensitizing dye. and silver nitrate aqueous solution (water 100 m
11 in which 0.022 g of silver nitrate was dissolved) was added at an equal flow rate over 5 minutes.

This emulsion contains 10% of isobutylene maleic anhydride copolymer.
After adding 10 cc of % alkaline aqueous solution to sediment, washing with water, and desalting, 10 g of gelatin was added and dissolved, and 0.425 mg of sodium thiosulfate was added to the colander and chemically sensitized at 55°C for 20 minutes. conduct,
1000 g of a monodispersed tetradecahedral silver iodobromide emulsion having an average grain size of 0.13 μm was prepared.

(Sensitizing dye (1)) To 81.8 g of the polymerizable compound (trade name: Kayarad R604, manufactured by Nippon Kayaku) used in Example 1, 0.77 g of the following copolymer and the cyanide used in Example 2 were added. 8.2 g of sublimable dye was dissolved. To the above solution, 6.4 g of the following reducing agent (hydrazine derivative) (1),
6.1 g of the following reducing agent (2), 0.09 g of the following disulfide compound, 0.0075 g of the following mercapto compound
and 1.8 g of a surfactant (Emarex NP-8, manufactured by Nippon Emulsion ■) were added, and 20 g of 3 methylene chloride was further dissolved to prepare an oily homogeneous solution.

(Copolymer) (Reducing agent (1)) (Reducing agent (2)) 4 (Disulfide compound) (Mercapto compound) Add 10% of potassium bromide to 15 g of the above silver halide emulsion.
Add 1.5 ml of aqueous solution, and further add 0.08% 1-methoxy-2-methylpropanol solution of reducing agent (3) below.
．． 5 ml was added and stirred for 5 minutes. Add to this solution 1 part of polyvinylpyrrolidone (K-15, manufactured by Wako Pure Chemical Industries, Ltd.).
% aqueous solution was added thereto, and the mixture was stirred for 5 minutes. This mixed solution containing the silver halide emulsion was added to the above homogeneous oily solution 5 and stirred for 5 minutes at 15,000 revolutions per minute using a homogenizer to obtain a photosensitive composition consisting of a W10 emulsion.

(Reducing agent (3)) An isocyanate compound (trade name:
4.5 g of DIION (manufactured by Takeda Pharmaceutical Co., Ltd.) was dissolved. This mixed solution was added to 210 g of a 10% aqueous solution of sodium salt of polyvinylbenzenesulfonic acid (trade name: Parsa TL-502, manufactured by National Starch Co., Ltd.) adjusted to pH 6.0, and heated at 40°C using a homogenizer.
The mixture was stirred at 9000 rpm for 30 minutes to obtain an emulsion in the form of a W10/W emulsion.

Separately, 21.6 g of a 37% formaldehyde aqueous solution and 70 g of distilled water were added to 13.2 g of melamine, heated to 60°C, and stirred for 30 minutes to form a transparent melamine.
An aqueous solution of formaldehyde precondensate was obtained.

81 g of an aqueous solution of this initial condensate was added to the above W10/W emulsion, and the pH was adjusted to 6 using a 20% aqueous solution of phosphoric acid.
．． Adjusted to 0. Next, this was heated to 60°C and 90°C.
After stirring for a minute, 27 g of a 40% aqueous solution of urea was added.
Similarly, the pH was adjusted to 3.5 using the above phosphoric acid aqueous solution. The dispersion thus obtained was further heated at 60°C at a rate of 1000 min.
Stir by rotation for 40 minutes, and finally adjust the pH to 6.5.
A photosensitive microcapsule dispersion was prepared by cooling to room temperature.

30 g of the above photosensitive microcapsule dispersion, 3.1 g of 10% aqueous gelatin solution, 4 mJl of the 5% aqueous surfactant solution used in Example 1, 10% aqueous dispersion of zinc hydroxide 2 .8 g and 37 g of water were added to prepare a coating solution for forming a photosensitive layer.

This coating liquid was applied onto polyethylene te 7 phthalate (support) having a thickness of 100 μm so that the wet film thickness was 50 μm, and dried to prepare a recording material.

[Image Formation and Evaluation] Using the recording material obtained above, the following image forming method according to the present invention was carried out and evaluated.

Example 1: 10% gelatin aqueous solution 27 g 1 guanidine picolinate salt 3.2 g 5% dextran aqueous solution 17 ml
A 5 m square 5% aqueous solution of the surfactant used in 1.
2-bis(vinylsulfonylacetamido)ethane 2
% aqueous solution and 45 mfi of water were added to prepare a mixed solution. Apply this mixed solution to a 70 μm wet film thickness on a 100 μm thick polyethylene terephthalate sheet.
The base-generating sheet was prepared by coating the mixture so as to give a base-generating sheet and drying it at about 40°C.

The recording material was passed through a continuous filter with a transmission density of 0 to 3.0 using a halogen lamp at 2000 lux.
Imagewise exposure was performed for seconds. After that, water was applied to the recording layer 8 in an amount of 10 g per 1 d, and then
The base generating sheets described above were brought into close contact with each other so that their membrane surfaces were in contact with each other. As it was, it was heated using a belt conveyance roller type heating device (heating temperature: 85° C., heating time: 10 seconds).

Next, after peeling off the base generating sheet from the recording material, this recording material was superimposed on the image-receiving material, and in this state it was passed through a heat roller (heating temperature 165°C, heating time 20 seconds). A clear positive color image was obtained.

[Example 4] [Preparation of recording material] Halogen gelatin aqueous solution (16 g of gelatin in 1500 mj2 of water)
and 0.5 g of sodium chloride, adjusted to pH 3.2 with IN sulfuric acid, and kept at 50°C], 300 mj2 of an aqueous solution containing 71 g of potassium bromide and an aqueous silver nitrate solution (0.5 g of silver nitrate in 300 mu of water). 59 mol dissolved) were simultaneously added at equal flow rates over 50 minutes. One minute after this addition 9 was completed, 43 mj2 of a 1% methanol solution of the following sensitizing dye (2) was added, and 15 minutes after the addition of the sensitizing dye, an aqueous solution 10 containing 2.9 g of potassium iodide was added.
0 ml and silver nitrate aqueous solution (silver nitrate 0 ml in 100 mfi of water)
．． 018 mol dissolved) was added at equal flow rates over a period of 5 minutes. To this emulsion, 10 cc of a 10% alkaline aqueous solution of isobutylene maleic anhydride copolymer was added, sedimented, washed with water, and desalted. 12 g of gelatin was added and dissolved, and further 0.5 mg of sodium thiosulfate was added and 1
Chemical sensitization was performed for 5 minutes, and the average particle size was 0.22 μm.
1000 g of a monodisperse 14-hedral silver iodobromide emulsion was prepared.

(Sensitizing dye (2)) 0 The yellow sublimable dye used in Example 1 was used instead of the cyan sublimable dye used in the preparation of the photosensitive composition of Example 3, and the silver halide emulsion was A photosensitive composition was prepared in the same manner as in Example 3 except that the silver halide emulsion obtained above was used instead.

A photosensitive microcapsule dispersion was prepared in the same manner as above, except that the photosensitive composition obtained above was used instead of the photosensitive composition used in the preparation of the photosensitive microcapsule dispersion in Example 3. Prepared.

A recording material according to the present invention was prepared in the same manner as above except that the photosensitive microcapsule dispersion liquid described above was used in place of the photosensitive microcapsule dispersion liquid used in the preparation of the recording material of Une Yuru Mori Benizahoku Region Example 3. did.

[Image formation and evaluation thereof] Using the recording material obtained in Example 4, Example 3
When the same image forming method according to the present invention was carried out in Example 1, a clear yellow positive color image was obtained.

Claims (1)

[Scope of Claims] 1. An energy imparting portion by imagewise imparting energy to the recording layer of a recording material having a recording layer formed by dispersing a large number of microcapsules containing a polymerizable compound and a sublimable dye. The polymerizable compound in the microcapsules is cured, and then, by heating the recording material with the image receiving material superimposed on the recording material, the sublimable dye is sublimated and transferred from the uncured capsules onto the image receiving material, thereby forming a colored image. An image forming method characterized by forming an image. 2. Light is irradiated imagewise onto the recording layer of a recording material having a recording layer in which a large number of microcapsules containing a polymerizable compound, a sublimable dye, and a photopolymerization initiator are dispersed, and the microcapsules in the light-irradiated area are By curing the polymerizable compound therein and then heating the recording material with the image receiving material superimposed on it, the sublimable dye is sublimated and transferred from the uncured capsule onto the image receiving material to form a colored image. An image forming method characterized by: 3. Imagewise irradiation of light onto the recording layer of a recording material having a recording layer in which a large number of microcapsules containing a polymerizable compound, silver halide, a reducing agent, and a sublimable dye are dispersed, and at the same time or Thereafter, heat development is performed to harden the polymerizable compound in the microcapsules in the light irradiated area, and then, by heating the recording material with the image receiving material superimposed on it, the sublimable dye is transferred from the uncured capsules to the image receiving material. An image forming method characterized by forming a colored image by sublimating upward.