JPH04260040A - Image receiving material and image forming method using same - Google Patents

Abstract

PURPOSE:To provide the image receiving material improved in storage stability of an image formed on it and the image forming method using this material. CONSTITUTION:The image receiving material has an image receiving layer containing a white pigment surface treated with at least a fatty acid or a rosin acid on a support and the image is formed on the image receiving material by using this image receiving material and a photosensitive material.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image-receiving material having an image-receiving layer on a support and an image-forming method using the same.

0002

[Prior Art] Conventionally, image-receiving materials have been used in various image-forming methods as materials that allow images to be easily obtained through relatively simple operations such as pressure transfer when forming images using recording materials. has been done. For example, image-receiving materials can be used for image forming methods such as electrophotography, thermal transfer type thermal recording method, heat sublimation type thermal recording method, etc., as well as Japanese Patent Publication No. 64-7377
Photopolymerizable photosensitive recording materials described in JP-A-58-88739, JP-A-58-88740, and JP-A-59-30537, photodegradable photosensitive recording materials described in JP-A-58-88739, etc. It is used in image forming methods using In addition, recently, Japanese Patent Application Laid-open No. 61-275742,
It has been found that it can be advantageously used in the image forming method using a photosensitive material using silver halide as a photosensor described in Publications No. 61-278849, No. 62-187346, and Japanese Patent Application No. 1-205881. has been done. In the image forming method using a photosensitive material using silver halide, a latent image is formed on the photosensitive silver halide depending on the amount of light exposed, and the portion where the latent image is formed is polymerizable through development processing. The compound polymerizes. After this polymerizable compound is polymerized in the form of an image, the photosensitive material and the image-receiving material are overlapped and pressurized, whereby the color image-forming substance is transferred onto the image-receiving material together with the unpolymerized polymerizable compound, and an image is formed on the image-receiving material. is formed. On the contrary, a method of polymerizing a polymerizable compound in a portion where a latent image is not formed is disclosed in Japanese Patent Application Laid-Open No. 62-70836 and Japanese Patent Application No. 1-27108.
There is a description in the publication and specification of No. 0. That is, in the above image forming method, the image receiving material plays the role of easily and efficiently reproducing the image formed on the photosensitive material. It has been known that the image formed on the image-receiving material thus formed has a problem of deterioration in image quality, such as a decrease in density or discoloration, depending on the storage condition of the image-receiving material.

Conventionally, the following method proposed by the applicant of the present invention has been known as a means for improving the storage stability of images. For example, one embodiment of the image forming method described above is a method of curing (photofixing) an image transferred from a photosensitive material containing a photopolymerization initiator onto an image receiving material by irradiating the image with light. 62-161149), and a method of curing (heat fixing) the image on the image receiving material after transfer by heating the image on the image receiving material using an image receiving material containing a thermal polymerization initiator in the image receiving layer in advance (JP-A No. 62-161149). Showa 62-2104
44), and a method of fixing an image using a hardening agent of a polymerizable compound (Japanese Patent Application Laid-open No. 63-218942).
can be mentioned. These methods are extremely effective methods for improving the storage stability of images because the unpolymerized polymerizable compound transferred onto the image-receiving material is cured by performing a fixing process.

0004

[Problems to be Solved by the Invention] Conventionally known image fixing methods have been very effective means for improving the shelf life of images, but after transferring the image onto an image receiving material, it is necessary to There are also problems in that the process requires steps such as the following, which causes troublesome handling and increases the size of the device. SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming method that improves the above-mentioned drawbacks in image storage and easily obtains images with excellent density, hue, saturation, or resolution.

[0005]

[Means for Solving the Problems] The present invention provides, on a support,
The present invention provides an image-receiving material having an image-receiving layer containing a white pigment surface-treated with at least fatty acid or rosin acid.

[0006] Further, a photosensitive material having a photosensitive layer containing microcapsules encapsulating at least a polymerizable compound, a pigment, a reducing agent, and a photosensitive silver halide on a support,
After polymerizing the polymerizable compound into an image, the photosensitive material and an image-receiving material containing at least an image-receiving layer containing a white pigment whose surface has been treated with fatty acid or rosin acid are superimposed, and pressure is applied to form the image-receiving material. This invention provides an image forming method characterized by forming an image thereon.

Further, the present invention provides a photosensitive material having a photosensitive layer containing microcapsules containing at least a polymerizable compound, a pigment, and a photopolymerization initiator on a support, after image-wise polymerization of the polymerizable compound. , an image-receiving material containing a white pigment surface-treated with fatty acid or rosin acid in at least the image-receiving layer, and the photosensitive material are superimposed,
An image forming method is also provided, characterized in that an image is formed on an image receiving material by applying pressure.

According to the research of the present inventor, when an image is formed using an image-receiving material having an image-receiving layer on a support and at least the image-receiving layer containing a white pigment surface-treated with a fatty acid or rosin acid, an image can be formed. It was found that the storage stability of Particularly, the present invention was effective when used in an image forming method using a photosensitive material having a photosensitive layer containing microcapsules encapsulating a polymerizable compound and a pigment. In the case of conventionally known image-receiving materials that use only white pigments without surface treatment, depending on the storage condition of the image, the density may decrease and the image may lose its sharpness. Regarding storage conditions, there was a strong tendency for concentration to decrease especially when stored at high temperatures.

The reason for the improvement in storage stability is not clear, but by using a white pigment surface-treated with fatty acid or rosin acid, the affinity between the white pigment and the ink (pigment and unpolymerized polymerizable compound) is improved. It is thought that the storage stability of the image is improved because the ink permeation into the support is suppressed, or the permeation of the ink into the pores of the white pigment particles is suppressed through surface treatment. It will be done.

Image receiving materials that can be used in the image forming method of the present invention will be explained below. For general image forming methods using image-receiving materials, see Japanese Patent Application Laid-Open No. 61-2
There is a description in Publication No. 78849. The image-receiving material has an image-receiving layer provided on a support. As the support for the image-receiving material, any conventionally known support can be used. General specific examples are listed below. First, polyester (
polyethylene terephthalate, polyethylene naphthalene dicarboxylate, etc.), polyamide, polyolefin, polyvinyl chloride, polyethylene terephthalate,
Various plastic films or sheets such as polystyrene, methacrylate, and polycarbonate, as well as films or sheets processed to give white reflective properties to the plastic, can be used.

[0011] Furthermore, as metals and their analogs, metal foils of aluminum, iron, stainless steel, copper, etc., metal meshes, metal vapor deposition, plastic films, paper, cloth, etc., which are coated with metal foils or laminated with metal foils, can also be used. Furthermore, base paper (uncoated paper), high-quality paper, art paper,
Coated paper, cast coated paper, baryta paper, wallpaper, backing paper, synthetic resin or emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internally coated paper, paperboard, cellulose fiber paper, polyolefin coated paper (especially coated on both sides with polyethylene) You can also use coated paper such as Synthetic paper (
synthetic paper such as polyolefin and polystyrene),
Cloth can also be used.

Although laminates of any combination of the above supports may be used, paper is usually preferred. 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. Also,
Regarding image-receiving materials using transparent supports, JP-A-62
There is a description in Publication No.-209531.

Next, the image receiving layer will be explained. The image-receiving layer of the image-receiving material is composed of a white pigment, a binder, and other additives, and the receptivity of the polymerizable compound is increased by the white pigment itself or by the voids between the particles of the white pigment. As the white pigment used in the image-receiving layer of the present invention, any conventionally known white pigment can be used. The image-receiving material of the present invention uses a white pigment that has been surface-treated with at least fatty acid or rosin acid. As a specific example of a white pigment,

[
Examples of inorganic white pigments include silicon oxide,
Oxides such as titanium oxide, zinc oxide, magnesium oxide, aluminum oxide, magnesium sulfate, barium sulfate, calcium sulfate, magnesium carbonate, barium carbonate,
Alkaline earth metal salts such as calcium carbonate, calcium silicate, magnesium hydroxide, magnesium phosphate, magnesium hydrogen phosphate, etc., as well as aluminum silicate,
Aluminum hydroxide, zinc sulfide, various clays, talc,
Examples include kaolin, zeolite, acid clay, activated clay, and glass. As an organic white pigment, polyethylene,
Examples include polystyrene, benzoguanamine resin, urea-formalin resin, melamine-formalin resin, and polyamide resin. These white pigments may be used alone or in combination, but those with high oil absorption to polymerizable compounds are preferred.

As the fatty acid or rosin acid that can be used for surface treatment of these white pigments, conventionally known fatty acids or rosin acids can be used. The fatty acid is preferably a saturated or unsaturated organic acid having 6 to 18 carbon atoms, and is preferably used in the form of an alkali metal or alkaline earth metal salt. Rosin acid is a saponified version of rosin, commonly used for paper size.
Ordinary sodium rosin acid is preferably used. In addition, regarding rosin, there are descriptions of the constituent compounds, etc. in the following literature.

[0016] “Paper Engineering” co-authored by Murai and Nakanishi (Kogaku Tosho,
Published in 1972) P. 228-231 Surface treatment methods include conventionally known methods, such as ■ coating method, ■ topochemical method, ■ mechanochemical reaction method, and ■
There are micro-encapsulation methods, ■ high-energy utilization methods, ■ interfacial precipitation methods, etc. For details, please refer to "Powder Surface Modification Technical Data Collection" (edited by Soft Giken Publishing Department (published in 1982)).
29th Pigment Introductory Course Text” P. 17-20 (19
It is described in known literature such as ``Paint Flow and Pigment Dispersion'' (written by T. C. Patton, published by Kyoritsu Shuppan) (published in 1987) (edited by the Coloring Materials Association and Japan Pigment Technology Association).

The fatty acid or rosin acid is preferably 5% to 0.1% by weight, preferably 2% by weight, based on the dry weight of the white pigment.
% to 0.5% by weight. The surface-treated white pigment may be used alone or in combination. In addition, it may be used in combination with a white pigment that has not been surface-treated at all; in this case, the proportion of the surface-treated white pigment is 50% to 100% by weight of the total amount of white pigment used.
It is preferably 70% to 100%.

Further, as the binder used in the image-receiving layer of the present invention, water-soluble polymers, polymer latexes, polymers soluble in organic solvents, etc. can be used. Examples of water-soluble polymers include cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, and methyl cellulose, proteins such as gelatin, phthalated gelatin, casein, and ovalbumin, starches such as dextrin and etherified starch, polyvinyl alcohol, and polyvinyl alcohol moieties. Synthetic polymers such as acetal, poly-N-vinylpyrrolidone, polyacrylic acid, polymethacrylic acid, polyacrylamide, polyvinylimidazole, polyvinylpyrazole, polystyrene sulfonic acid,
Other examples include locust bean gum, pullulan, gum arabic, and sodium alginate.

Examples of the polymer latex include styrene-butadiene copolymer latex, methyl methacrylate-butadiene copolymer latex, acrylic acid ester and/or methacrylic acid ester polymer or copolymer latex, and ethylene-vinyl acetate copolymer latex. Examples include polymer latex. Examples of polymers soluble in organic solvents include polyester resins, polyurethane resins, polyvinyl chloride resins, polyacrylonitrile resins, and the like.

[0020] The above-mentioned binders can be used in combination of two or more types, and furthermore, the two types of binders can be used in combination in such a ratio that phase separation occurs. An example of such usage is JP-A-1-154789.
There is a description in the bulletin. The average particle size of the white pigment is 0.
The thickness is 1 to 20μ, preferably 0.1 to 10μ, and the coating amount is in the range of 0.1g to 60g, preferably 0.5g to 30g. The weight ratio of the white pigment to the binder is preferably in the range of 0.01 to 0.4 of the binder to 1 of the pigment;
．． The range of 0.03 to 0.3 is more preferable.

In addition to the binder and the white pigment, the image-receiving layer may contain various additives as described below. For example, when using a coloring system consisting of a color former and a color developer, the image receiving layer can contain the color developer. Typical color developers include phenols, organic acids or their salts, and esters, but when leuco dyes are used as color image forming substances,
Zinc salts of derivatives of salicylic acid are preferred, especially 3,
Zinc 5-di-α-dimethylbenzylsalicylate is preferred. The color developer is preferably contained in the image-receiving layer in a coating amount ranging from 0.1 to 50 g/m<2>. More preferably, it is in the range of 0.5 to 20 g/m2.

The image-receiving layer may contain a thermoplastic compound. When the image-receiving layer contains a thermoplastic compound, it is preferable that the image-receiving layer itself is constituted as an aggregate of thermoplastic compound fine particles. The image-receiving layer having the above structure has the advantage that it is easy to form a transferred image, and that a glossy image can be obtained by heating after image formation. The above thermoplastic compound is not particularly limited and can be arbitrarily selected from known plastic resins (plastics), waxes, and the like. However, the glass transition point of the thermoplastic resin and the melting point of the wax are preferably 200° C. or lower. Regarding the image-receiving material having an image-receiving layer containing thermoplastic compound fine particles as described above,
It is described in No. 2-280071 and No. 62-280739.

The image-receiving layer may contain a photopolymerization initiator or a thermal polymerization initiator. In forming images using image-receiving materials, color image-forming substances are transferred along with unpolymerized polymerizable compounds. Therefore, a photopolymerization initiator or a thermal polymerization initiator can be added to the image-receiving layer for the purpose of smoothly proceeding with the curing process (fixing process) of the unpolymerized polymerizable compound. Further, regarding an image receiving material having an image receiving layer containing a photopolymerization initiator, see JP-A-62-161149, and regarding an image-receiving material having an image-receiving layer containing a thermal polymerization initiator, see JP-A-62-210444, respectively. There is a description.

Next, a photosensitive material that can be used in the image forming method of the present invention will be described. The photosensitive material has microcapsules containing at least a polymerizable compound and a pigment on a support. When used in the image forming method of the present invention, which will be described below, in order to polymerize the polymerizable compound in an imagewise manner, the photosensitive material generally contains at least silver halide, a reducing agent, a pigment, and The first embodiment includes microcapsules encapsulating a polymerizable compound, and the second embodiment includes microcapsules encapsulating at least a photopolymerization initiator, a pigment, and a polymerizable compound on a support. It will be done. However, it is not limited to these two types of embodiments, and image recording materials having microcapsules containing a thermal polymerization initiator, a polymerizable compound, and a pigment described in JP-A-62-176893 can also be used. .

[0025] In the following explanation, the first embodiment and the second embodiment are taken up. Since image information is written in these using light, the layer containing microcapsules is referred to as a "photosensitive layer." First, silver halide, reducing agent, pigment, and polymerizable compound, which are the main components of the photosensitive material of the first embodiment, will be sequentially explained.

The light-sensitive material of the present invention may contain any one of silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodide, silver iodobromide, and silver chloroiodobromide as silver halide. Particles can also be used.

The silver halide grains in the photographic emulsion may have regular crystals such as cubic, octahedral, dodecahedral, or tetradecahedral, or irregular crystal systems such as spherical or plate-like. It may have crystal defects such as twin planes, or a composite form thereof.

The grain size of the silver halide can be as fine as about 0.01 micron or less, or as large as a projected area diameter of up to about 10 microns, or as a polydisperse emulsion as described in US Pat. No. 3,574,628. No. 3,655,394
Monodisperse emulsions such as those described in No. 1, British Patent No. 1,413,748 and the like may also be used.

Tabular grains having an aspect ratio of about 5 or more can also be used in the present invention. Tabular grains are described in Gutoff, Photographic Science and Engineering.
hic Science and Engineering
ng), Vol. 14, pp. 248-257 (1970);
U.S. Patent Nos. 4,434,226 and 4,414,31
No. 0, No. 4,433,048, No. 4,439,520
and British Patent No. 2,112,157.

The crystal structure may be uniform, the inside and outside may have different halogen compositions, or it may have a layered structure. Further, silver halides having different compositions may be joined by epitaxial joining,
Further, it may be bonded with a compound other than silver halide, such as silver rhodan or lead oxide. In addition, halogen composition,
Two or more types of silver halide grains having different crystal habits, grain sizes, etc. can also be used together.

Silver halide photographic emulsions that can be used in the present invention include, for example, Research Disclosure (RD) No.
．． 17643 (December 1978), pp. 22-23,
“I. Emulsion preparation
ion and types)” and No. 1
8716 (November 1979), p. 648, etc.

The silver halide emulsion used is usually one that has been subjected to physical ripening, chemical ripening and spectral sensitization. Additives used in such processes are listed in Research Disclosure No. 17643 and the same No. 18716
The relevant sections are summarized in the table below.

Known photographic additives that can be used in the present invention are also described in the above two Research Disclosures, and the relevant descriptions are shown in the table below.

Additive type RD1764
3 RD18716 Chemical sensitizer page 23
Page 648 right column Sensitivity enhancer
Same as above Spectral sensitizer 23-24
Page 648, right column ~ Supersensitizer
Page 649 right column Antifoggant Pages 24-25 Page 649 right column ~
and stabilizers

[0035] As the silver halide grains, as in the photosensitive material described in JP-A No. 63-68830,
It is preferable to use silver halide grains with relatively low fog values.

In order to uniformly contain silver halide in the microcapsules, it is preferable that a copolymer consisting of a hydrophilic repeating unit and a hydrophobic repeating unit be dissolved in the polymerizable compound. Details thereof are described in JP-A-62-209450, JP-A-63-287844, and JP-A-2-216151.

The reducing agent that can be used in the photographic material of the present invention has a function of reducing silver halide and/or a function of promoting (or suppressing) polymerization of a polymerizable compound. There are various types of reducing agents having the above functions. The 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, aminoreductones, o- or p-
Sulfonamidophenols, o- or p-sulfonamidonaphthols, 2,4-disulfonamidophenols, 2,4-disulfonamidonaphthols, o-
or p-acylaminophenols, 2-sulfonamide indanones, 4-sulfonamide-5-pyrazolones, 3-sulfonamide indoles, sulfonamide pyrazolobenzimidazoles, sulfonamide pyrazolotriazoles, α- These include sulfonamide ketones and hydrazines.

[0038] Regarding various reducing agents having the above-mentioned functions, please refer to JP-A-61-183640 and JP-A-61-1885.
35, 61-228441, and JP-A-62-70836, 62-86354, and 6
No. 2-86355, No. 62-206540, No. 62-
No. 264041, No. 62-109437, No. 63-2
No. 54442, JP-A No. 1-267536, JP-A No. 2-14
No. 1756, No. 2-141757, No. 2-20725
No. 4, No. 2-262662, No. 2-269352,
It is described in publications such as No. 2-267559. (Including those described as developing agents or hydrazine derivatives)
Regarding the above reducing agent, T. Written by Jmames”Th
e Theory of the Photography
hic Process” 4th edition, pp. 291-334 (1977) Research Disclosure Magazine Vo
l. 170, No. 17029, June 1978 (9-
15 pages), and the same magazine Vol. 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 may be used in place of the reducing agent. good. The reducing agents and reducing agent precursors described in each of the above-mentioned publications, specifications, and literature can also be effectively used in the photosensitive material used in this specification. Therefore, the "reducing agent" in this specification includes the reducing agents and reducing agent precursors described in each of the above-mentioned publications and literature.

Among these reducing agents, those having basicity that form salts with acids can also be used in the form of salts with appropriate acids.

These reducing agents may be used alone, or as described in the above specifications, two or more 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 described above can occur simultaneously, so it is difficult to specify which effect is occurring. Specific examples of the above reducing agent are shown below.

[0041]

[Chemical formula 1]

[0042]

[Case 2]

[0043]

[Chemical formula 3]

[0044]

[C4]

The amount of the reducing agent added can vary widely, but is generally 0.1 to 1500 mol %, preferably 10 to 300 mol %, based on the silver salt.

As the pigment, in addition to commercially available pigments, known pigments described in various literature can be used. Regarding literature, see Color Index (C.I.) Handbook, "Latest Pigment Handbook" edited by Japan Pigment Technology Association (published in 1977), "
These include ``Latest Pigment Application Technology'' (CMC Publishing, published in 1986) and ``Printing Ink Technology'' (CMC Publishing, published in 1984). By color, the types of pigments are white pigments, black pigments, yellow pigments, orange pigments, brown pigments, red pigments, purple pigments, blue pigments, green pigments, fluorescent pigments, metal powder pigments, and other polymer-bonded pigments. can be mentioned. Specifically, insoluble azo pigments, azo lake pigments, condensed azo pigments, chelate azo pigments, phthalocyanine pigments, anthraquinone pigments, perylene and perinone pigments, thioindigo pigments,
Quinacridone pigments, dioxazine pigments, isoindolinone pigments, quinophthalone pigments, dyeing lake pigments, azine pigments, nitroso pigments, nitro pigments, natural pigments,
Fluorescent pigments, inorganic pigments, etc. can be used.

The pigment that can be used in the present invention may be the above-mentioned naked pigment, or may be a pigment that has been subjected to a surface treatment. Surface treatment methods include methods of surface coating with resin or wax, methods of attaching surfactants, methods of bonding reactive substances (for example, silane coupling agents, epoxy compounds, polyisocyanates, etc.) to the pigment surface, etc. is considered and described in the following documents. Properties and applications of metal soaps (Saiwai Shobo) Printing ink technology (CMC Publishing, 1984) Latest pigment application technology (CMC Publishing, 1986)

The particle size of the pigment that can be used in the present invention after being dispersed in the polymerizable compound is 0.
．． It is preferably in the range of 01μ to 10μ, and 0.05μ
It is more preferable to be in the range of 1 μm. The pigment is preferably used in an amount of 5 to 120 parts by weight, more preferably 10 to 60 parts by weight, based on 100 parts by weight of the polymerizable compound described later.

[0049] As a method for dispersing the pigment into the polymerizable compound, known dispersion techniques used in ink production, toner production, etc. can be used. Examples of the dispersing machine include a sand mill, attritor, pearl mill, super mill, ball mill, impeller, desperser, KD mill, colloid mill, Dynatron, three-roll mill, and pressure kneader. Details are described in "Latest Pigment Application Technology" (CMC Publishing, 1986).

The polymerizable compound is not particularly limited, and known polymerizable compounds can be used. Further, since the photosensitive material is intended to immobilize the pigment by polymerizing and curing the polymerizable compound, the polymerizable compound is preferably a crosslinkable compound having a plurality of polymerizable functional groups in the molecule.

[0051] Polymerizable compounds that can be used in photosensitive materials are described in the application specifications for the series of photosensitive materials described above and below. Polymerizable compounds used in photosensitive materials generally have 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 having ethylenically unsaturated groups that can be used in photosensitive materials include acrylic acid and its salts, acrylic esters, acrylamides, methacrylic acid and its salts, methacrylic esters, and methacrylamides. , maleic anhydride, maleic esters, itaconic esters, styrenes, vinyl ethers, vinyl esters, N-vinyl heterocycles, allyl ethers, allyl esters, and derivatives thereof.

Specific examples of polymerizable compounds that can be used in photosensitive materials include acrylic esters,
n-butyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, benzyl acrylate, furfuryl acrylate, ethoxyethoxyethyl acrylate, tricyclodecanyloxy acrylate, nonylphenyloxyethyl acrylate, 1,3
-dioxolane acrylate, hexanediol diacrylate, butanediol diacrylate, neopentyl glycol diacrylate,

Tricyclodecane dimethylol diacrylate, 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-dihydroxymethyl-1,3-dioxane triacrylate, triacrylate of propylene oxide adduct of trimethylolpropane, polyacrylate of hydroxy polyether, polyester acrylate, polyurethane acrylate, etc. can be mentioned.

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

The above polymerizable compounds may be used alone or in combination of two or more. For photosensitive materials containing two or more types of polymerizable compounds, please refer to JP-A No. 62-210445.
There is a description in the bulletin. In addition, when heat-treating the photosensitive material, it is preferable to use a compound with a high boiling point (for example, a boiling point of 80° C. or higher) that is difficult to volatilize during heating. In the photosensitive material of the first embodiment, the polymerizable compound is preferably used in an amount of 5 to 120,000 parts by weight per 1 part by weight of silver halide, and more preferably,
12 to 12,000 parts by weight. The pigment is preferably used in an amount of 5 to 120 parts by weight, more preferably 10 to 60 parts by weight, based on 100 parts by weight of the polymerizable compound.

Next, organic silver salts, radical generators, bases, base precursors, thermal solvents, and compounds having an oxygen removing function, which can be optionally used in the photosensitive material of the first embodiment, will be sequentially described. explain. In the present invention, an organic metal salt can be used as an oxidizing agent together with photosensitive silver halide. Among such organic metal salts, organic silver salts are particularly preferably used.

Organic compounds that can be used to form the above organic silver salt oxidizing agent include those described in US Pat. No. 4,500,6
26, columns 52 to 53, etc., of benzotriazoles, fatty acids, and other compounds. Also, JP-A-60-11
Silver salts of carboxylic acids having alkynyl groups such as silver phenylpropiolate described in JP-A No. 3235, and JP-A-61
Acetylene silver described in the publications No. 249044 and No. 64-57256 is also useful. Two or more types of organic silver salts may be used in combination. The organic silver salts mentioned above are 0.01 to 10 mol, preferably 0.01 to 10 mol, preferably 0.01 to 10 mol, preferably 0.01 to 10 mol, per mol of photosensitive silver halide.
It can be used in combination with silver halide in an amount ranging from 0.01 to 10 mol, preferably from 0.01 to 1 mol.

In the photosensitive layer, the above-mentioned reducing agent polymerization promotion (
Alternatively, a radical generator that participates in the reaction (polymerization inhibition) may be added. Regarding a photosensitive material using triazene silver as the radical generator, JP-A-62-195639
JP-A-62-195640 describes a photosensitive material using silver diazotate, and JP-A-62-195641 describes a photosensitive material using an azo compound. The light-sensitive material of the present invention may further contain a base or a base precursor as an image formation accelerator.

As the base and base precursor that can be used in the photosensitive material of the present invention, inorganic bases and organic bases, or their base precursors (decarboxylation type, thermal decomposition type, reactive type, complex salt forming type, etc.) can be used. can.

Preferred base precursors include JP-A-59-180549, JP-A-59-180537, JP-A-59-195237, JP-A-61-32844, and JP-A-61.
-36743, 61-51140, 61-52
No. 638, No. 61-52639, No. 61-53631
No. 61-53634, No. 61-53635, No. 61-53636, No. 61-53637, No. 61-
No. 53638, No. 61-53639, No. 61-536
No. 40, No. 61-55644, No. 61-55645, No. 61-55646, No. 61-84640, No. 6
No. 1-107240, No. 61-219950, No. 61
-251840, 61-252544, 61-
No. 313431, No. 63-316740, No. 64-6
8746 and Japanese Patent Application No. 62-209138, salts of organic acids and bases that are decarboxylated by heating, and JP-A Nos. 59-157637 and 59-166.
Examples include compounds that eliminate bases upon heating as described in Japanese Patent No. 943 and No. 63-96159.

The base precursor of the present invention is 50
It is preferable to release the base at a temperature between 80°C and 200°C.
It is more preferable to release at a temperature of 180°C to 180°C. In the present invention, in order to make the heat development reaction proceed more rapidly, it is preferable to accommodate the base precursor in microcapsules. In that case, the following base precursor consisting of a salt of a carboxylic acid and an organic base having a solubility in water and a polymerizable compound at 25° C. of 1% or less is preferred.

(a) The base precursor consists of a salt of a carboxylic acid and an organic base, and the organic base has the following formula (1).
It is a diacid to tetraacid base consisting of two to four partial structures corresponding to an atomic group obtained by removing one or two hydrogen atoms from amidine represented by the formula, and a structural group of the partial structure.

[0064]

[C5]

[In the above formula (1), R11, R12
, R13 and R14 each represent a monovalent group selected from the group consisting of a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic residue (each group is may have one or more substituents), and R11, R12,
Any two groups selected from R13 and R14 may be bonded to each other to form a five- or six-membered nitrogen-containing heterocycle]

(b) A partial structure in which the base precursor is composed of a salt of a carboxylic acid and an organic base, and the organic base corresponds to an atomic group obtained by removing one or two hydrogen atoms from guanidine represented by the following formula (2). It is a diacid to tetraacid base consisting of two to four of these and a linking group of the partial structure.

[0067]

[C6]

[In the above formula (2), R21, R22
, R23, R24 and R25 each represent a monovalent group selected from the group consisting of a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic residue (each (the group may have one or more substituents), and R21,
Any two groups selected from R22, R23, R24 and R25 may be bonded to each other to form a five- or six-membered nitrogen-containing heterocycle. The base precursors are described in detail in JP-A-63-31670 and JP-A-64-68746, respectively. Specific examples of these base precursors are shown below, but are not limited thereto.

[0069]

[C7]

[0070]

[Chemical formula 8]

[0071]

[Chemical formula 9]

[0072]

[Chemical formula 10]

[0073]

[Chemical formula 11]

[0074]

[Chemical formula 12]

In the present invention, when the base precursor is contained in microcapsules, a photosensitive composition in which the base precursor is directly solid-dispersed in a polymerizable compound may be used. Kaihei 1-2
63641), it is particularly preferable to use a photosensitive composition in which a base precursor is dispersed in water and emulsified in a polymerizable compound. (Unexamined Japanese Patent Publication No. 63-21
No. 8964, Japanese Patent Application No. 1-182245, Japanese Patent Application No. 1-1
60148 and the specification) Here, when dispersing the base precursor in water, it is preferable to use a nonionic or amphoteric water-soluble polymer.

Examples of nonionic water-soluble polymers include polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polymethyl vinyl ether, polyacryloylmorpholine, polyhydroxyethyl acrylate, polyhydroxyethyl methacrylate-co-acrylamide, hydroxyethyl cellulose, hydroxy Examples include propylcellulose and methylcellulose. Moreover, gelatin can be mentioned as an amphoteric water-soluble polymer.

The above water-soluble polymer is preferably contained in an amount of 0.1 to 100% by weight, more preferably 1 to 50% by weight, based on the base precursor. Further, the base precursor is preferably contained in an amount of 5 to 60% by weight, more preferably 10 to 50% by weight, based on the dispersion. In addition, the base precursor is 2 for polymerizable compounds.
It is preferably contained in a proportion of ~50% by weight, and 50% by weight.
More preferably, it is contained in a proportion of 30% by weight.

In addition, in order to reduce the solubility of the base precursor in the polymerizable compound, polyethylene glycol, polypropylene glycol, benzoic acid amide, cyclohexyl urea, octyl alcohol, dodecyl alcohol, stearyl alcohol, stearamide, etc. are added to the polymerizable compound. -OH,
-SO2 NH2 , -CONH2 , -NHCONH
A compound having a hydrophilic group such as 2 can also be added.

Various antifoggants or photographic stabilizers can be used in the present invention. Examples include azoles and azaindenes described in RD17643 (1978) pages 24-25, and JP-A-59-16844.
Nitrogen-containing carboxylic acids and phosphoric acids described in No. 2, mercapto compounds and metal salts thereof described in JP-A-59-111636, acetylene compounds described in JP-A-62-87959, etc. are used. It will be done.

Various development stoppers can be used in the photosensitive material in order to always obtain a constant image regardless of the processing temperature and processing time during development. The development stopper referred to here is a compound that neutralizes the base immediately after proper development or reacts with the base to lower the base concentration in the film and stop development, or a compound that inhibits development by interacting with silver and silver salts. It is a compound that Specific examples thereof include acid precursors that release acids when heated, electrophilic compounds that cause a substitution reaction of coexisting bases when heated, nitrogen-containing heterocyclic compounds, mercapto compounds, and precursors thereof. For more details, see JP-A-6
No. 2-253159 (31)-(32), Patent Application No. 1-
It is described in No. 72479, No. 1-3471, etc. As a thermal solvent, a compound that can be a solvent for a reducing agent,
Compounds that are high dielectric constant materials and are known to promote physical development of silver salts are useful. Useful heat solvents include polyethylene glycols described in U.S. Pat. No. 3,347,675, derivatives of polyethylene oxide such as oleic acid ester, beeswax, monostearin, -
Compounds with high dielectric constant having SO2 - and/or -CO- groups, polar substances described in US Pat. No. 3,667,959, Research Disclosure, 1976, 1
1,10-decanediol described on pages 26 to 28 of the February issue,
Methyl anisate, biphenyl suberate, and the like are preferably used. Regarding photosensitive materials using hot solvents,
There is a description 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. Incidentally, a photosensitive material using a compound having two or more mercapto groups is described in JP-A-62-209443. Alternatively, a liquid having an oxygen-blocking effect may be applied to the photosensitive layer of the outer shell of the microcapsules for development. A specific example of the liquid is water.

Thermal polymerization initiators that can be used in photosensitive materials are generally compounds that thermally decompose under heating to generate polymerization initiating species (particularly radicals), and are usually used as radical polymerization initiators. be. Regarding thermal polymerization initiators, please refer to pages 6 to 1 of "Addition Polymerization/Ring-Opening Polymerization" edited by the Polymer Experimental Science Editorial Committee of the Polymer Society of Japan (1983, Kyoritsu Shuppan).
It is described on page 8 etc.

Specific examples of the thermal polymerization initiator include azobisisobutyronitrile, 1,1'-azobis(1-cyclohexanecarbonyltrile), dimethyl-2,2'-azobisisobutyrate, and 2,2'-azobisisobutyronitrile. - Azo compounds such as azobis(2-methylbutyronitrile) and azobisdimethylvaleronitrile, benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, t-butyl hydroperoxide, cumene hydroperoxide, etc. Examples include organic peroxides such as hydrogen peroxide, inorganic peroxides such as potassium persulfate and ammonium persulfate, and sodium p-toluenesulfinate.

[0084] The thermal polymerization initiator is 0.0% relative to the polymerizable compound.
It is preferable to use it in a range of 1 to 120% by weight,
More preferably, it is used in a range of 1 to 10% by weight. In addition, in a system in which a polymerizable compound is polymerized in a portion where a silver halide latent image is not formed, it is preferable to add a thermal polymerization initiator to the photosensitive layer. Furthermore, a photosensitive material using a thermal polymerization initiator is described in JP-A-62-70836.

In the photosensitive layer of the photosensitive material of the first embodiment, like the thermal polymerization initiator described above, the polymerizable compound is used in the system for polymerizing the area where the silver halide latent image is not formed. For the purpose of polymerizing the unpolymerized polymerizable compound after transfer, a photopolymerization initiator as described in the description of the second embodiment of the photosensitive material below may be added. Regarding photosensitive materials using photopolymerization initiators, JP-A-62-16114
There is a description in Publication No. 9. Water release agents may also be used. Next, the photopolymerization initiator, pigment, and polymerizable compound, which are the main components of the photosensitive material of the second embodiment, will be sequentially explained.

Examples of preferred photopolymerization initiators include α-
Alkoxyphenyl ketones, polycyclic quinones, benzophenones and substituted benzophenones, xanthones, thioxanthones, halogenated compounds (e.g., chlorosulfonyl, chloromethyl and other aromatic compounds, chlorosulfonyl and chloromethyl heterocycles) Formula compounds,
chlorosulfonyl and chloromethylbenzophenones, and chlorofluorenones),

Haloalkanes, α-halo-α-phenylacetophenones,
Photoreducible dye-reducing redox couples, halogenated paraffins (e.g., brominated or chlorinated paraffins), benzoyl alkyl ethers, and lofin dimer-mercapto compound couples, and JP-A-62-14
Examples include organic boron compound anion salts of organic cationic compounds described in Japanese Patent No. 3044.

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, chloromethylbenzophenone,
Chlorosulfonyl benzophenone, fluorenone, carbon tetrabromide, benzoin butyl ether, benzoin isopropyl ether, 2,2'-bis(o-chlorophenyl)-4,4',5,5'-tetraphenylbiimidazole and 2-mercapto-5 -Methylthio-1,3,4-thiadiazole combinations, etc. can be mentioned.

As the photopolymerization initiator, the above-mentioned compounds may be used alone, or several types may be used in combination. In the photosensitive material of the present invention, the photopolymerization initiator is 0.5 to 30% by weight based on the polymerizable compound used.
It is preferable to use it within the range of . A more preferred usage range is 2 to 20% by weight. The pigment and polymerizable compound that can be used in the photosensitive material of the second embodiment are the same as those of the first embodiment described above. Next, components that can be optionally used in the photosensitive material of the second embodiment,
The sensitizer will be explained.

Preferred sensitizers are those that bring about an increase in sensitivity when used in combination with the above-mentioned photopolymerization initiator or photopolymerization initiation system, examples of which include compounds having active hydrogen in the molecule. Specific examples include N-phenylglycine, trimethylbarbituric acid, 2-mercaptobenzoxazole, 2-mercaptobenzothiazole, 2-mercaptobenzimidazole, and compounds represented by the following general formula (I) or (II). can be mentioned. General formula (I)

[0091]

[Chemical formula 13]

In the formula, R1 represents an alkyl group, an alkylthio group or a mercapto group. General formula (II)

00
93]

[Chemical formula 14]

In the formula, R2 represents a hydrogen atom or an alkyl group, and R3 represents an alkyl group or an aryl group.

In the image forming method of the present invention, the sensitizer is added in an amount of 0.5 to 100% relative to the polymerizable compound used.
It is preferable to use it within a range of % by weight. A more preferred range is 2 to 80% by weight.

Common matters regarding the photosensitive materials of the first embodiment and the second embodiment will be explained below. The main components of the photosensitive material of the first embodiment, such as a photopolymerization initiator, a pigment, and a polymerizable compound, or the main components of the second embodiment, such as silver halide, a reducing agent, a pigment, and a polymerizable compound, are: Used in microencapsulated form. The photosensitive material is composed of a photosensitive layer containing the microcapsules and a support, and the above-mentioned or below-mentioned "components that can be optionally used" may be present in the microcapsules in the photosensitive layer. However, it may be present in the photosensitive layer outside the microcapsules. The microcapsules, optionally usable components, and supports will be sequentially explained below.

[0097] Various known techniques can be applied to the microcapsules without particular limitations. Examples include U.S. Pat. No. 2,800,457 and U.S. Pat.
No. 8: A method using coacervation of a hydrophilic wall-forming material described in each specification; US Patent No. 3,287,154 and British Patent No. 990,443, and Japanese Patent Publication No. 3
No. 8-19574, No. 42-446 and No. 42-7
Interfacial polymerization method described in each publication No. 71; US Patent No. 34182
50 and 3,660,304; methods using isocyanate-polyol wall materials as described in U.S. Pat. No. 3,796,669;

Method of using isocyanate wall materials described in US Pat. No. 3,914,511; US Pat. No. 400
No. 1140, No. 4087376 and No. 4089
A method using a urea-formaldehyde-based or urea-formaldehyde-resircinol-based wall-forming material described in each specification of No. 802; a method using a wall-forming material such as melamine-formaldehyde resin or hydroxypropyl cellulose described in U.S. Pat. No. 4,025,455. ;Tokuko Sho 3
In situ method by polymerization of monomers described in British Patent No. 6-9168 and JP-A-51-9079; polymerization dispersion cooling method described in British Patent No. 927807 and British Patent No. 965074;

Examples include the spray drying method described in US Pat. No. 3,111,407 and British Patent No. 930,422. Although the method for microcapsulating oil droplets of a polymerizable compound is not limited to the above, a method in which a core substance is emulsified and then a polymer film is formed as a microcapsule wall is particularly preferred. Regarding photosensitive materials using microcapsules with outer shells made of polyamide resin and/or polyester resin, Japanese Patent Application Laid-Open No. 62-209437 describes microcapsules with outer shells made of polyurea resin and/or polyurethane resin. Regarding the photosensitive material used, please refer to JP-A-62
-209438 publication,

A photosensitive material using microcapsules having an outer shell made of amino aldehyde resin is described in JP-A-62-209439, and a photosensitive material using microcapsules having an outer shell made of gelatin is described in JP-A-62-209439. Regarding photosensitive materials using microcapsules having outer shells made of epoxy resin, Japanese Patent Application Laid-Open No. 62-209441 describes microcapsules having composite resin outer shells containing polyamide resin and polyurea resin. Regarding photosensitive materials using JP-A-62-2
No. 09447 describes a photosensitive material using a microcapsule having a composite resin outer shell containing a polyurethane resin and a polyester resin, and Japanese Patent Application Laid-Open No. 62-209442 describes a photosensitive material using microcapsules having a composite resin outer shell containing a polyurethane resin and a polyester resin.

In addition, Japanese Patent Application No. 2-216151 discloses that in order to obtain capsules with particularly excellent wall density, a reaction between a water-soluble polymer having a sulfinic acid group and a polymerizable compound having an ethylenically unsaturated group is described. Microcapsules in which a polymer wall of a high molecular compound such as melamine/formaldehyde resin is provided around a membrane made of a product have been disclosed and are preferred for the present invention. Note that, as in the photosensitive material described in JP-A-63-32535, it is preferable that the amount of residual aldehyde is kept below a certain value.

[0102] The average particle diameter of the microcapsules formed by the method of the present invention is preferably 5 to 25 μm. The particle size distribution of microcapsules was determined by Japanese Patent Application Laid-open No. 6
As in the photosensitive material described in Publication No. 3-5334, it is preferable that the distribution is uniform over a certain value. Further, the film thickness of the microcapsules is preferably within a certain value range with respect to the particle diameter, as in the photosensitive material described in JP-A-63-81336.

[0103] When silver halide is contained in microcapsules, it is preferable that the average particle size of the silver halide grains described above is one-fifth or less, and one-tenth or less of the average size of the microcapsules. It is more preferable that 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.

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.

In the production of the photosensitive microcapsules of the present invention, when an oily liquid containing at least silver halide, a reducing agent, a color image forming substance, and a polymerizable compound is dispersed in an aqueous medium, the aqueous medium contains , a nonionic water-soluble polymer and an anionic water-soluble polymer are preferably included. In this case, the oily liquid containing the polymerizable compound is preferably 10 to 120% by weight, more preferably 20 to 90% by weight, based on the aqueous medium.

Examples of nonionic water-soluble polymers include polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polymethyl vinyl ether, polyacryloylmorpholine, polyhydroxyethyl acrylate, polyhydroxyethyl methacrylate-coacrylamide, hydroxyethylcellulose, hydroxypropyl. Examples include cellulose and methylcellulose.

Examples of anionic water-soluble polymers include polystyrene sulfinic acid, styrene sulfinate copolymers, polystyrene sulfonates, styrene sulfonic acid copolymers, polyvinyl sulfate ester salts, polyvinyl sulfonates, Examples include maleic anhydride/styrene copolymer and maleic anhydride/isobutylene copolymer. In this case, the concentration of the anionic water-soluble polymer in the aqueous medium is preferably in the range of 0.01 to 5% by weight, more preferably in the range of 0.1 to 2% by weight. In the above case, it is particularly preferable to use a nonionic water-soluble polymer and a water-soluble polymer having a small amount of sulfinic acid groups together.

As the support for the photosensitive material of the present invention, the same supports as those for the image-receiving material described above can be used, but especially in the case of the first embodiment, it is preferable to use a material with good thermal conductivity. A preferred support is a polymer film, and a polymer film of 50μ or less is particularly preferred.

That is, the image forming method of the present invention requires a series of steps such as at least an imagewise exposure step, a pressurizing step, and, in the case of the first embodiment, a heating step. It is particularly preferable to use it in the form of a continuous band in terms of efficiency. Therefore, since the photosensitive material is subjected to operations such as conveyance, heating, pressurization, and rolling as a continuous strip, it has mechanical properties that are sufficient to withstand such operations.
Alternatively, thermal properties may be required. From this perspective, as a support, mechanical properties (tensile strength, elastic modulus, stiffness, etc.)
Polymer films are preferred, and among them, those with good thermal conductivity and a thickness of 50 μm or less are particularly preferred for the photosensitive material of the first embodiment. If the thickness exceeds 50 μm, the thermal conductivity is poor and it is difficult to shorten the heat development time. Moreover, those having a thickness of 10 μm or less have problems in transportability in terms of mechanical strength.

[0110] Furthermore, in order to coat the photosensitive layer on the support,
It is preferable to provide an undercoat layer as described in JP-A-61-113058 on the polymer film, or to provide a metal vapor deposited film such as aluminum on the polymer film. Therefore, as a support for a photosensitive material for carrying out the image forming method of the present invention, a polymer film having a thickness of 50 μm or less and having an aluminum vapor-deposited film is particularly preferable. Other components that can be used in the photosensitive material of the present invention will be explained below.

The binders that can be used in the photosensitive material can be contained in the photosensitive layer alone or in combination. It is preferable to use a mainly hydrophilic binder. Typical hydrophilic binders are transparent or translucent hydrophilic binders, such as natural substances such as gelatin, gelatin derivatives, cellulose derivatives, starch, gum arabic, etc., and polyvinyl alcohol, polyvinylpyrrolidone, acrylamide polymers, etc. 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 anti-smudge agent used in the photosensitive material is preferably a particulate material that is solid at room temperature. As a specific example,
Starch particles described in UK Patent No. 1,232,347, polymer fine powders described in US Pat. No. 3,625,736, etc., microcapsule particles containing no coloring agent described in UK Patent No. 1,235,991, etc., US Pat. No. 271
Examples include the fine cellulose powder described in No. 1375, and inorganic particles such as talc, kaolin, bentonite, waxite, zinc oxide, titanium oxide, and alumino. The average particle size of the particles is preferably in the range of 3 to 50 μm, more preferably in the range of 5 to 40 μm in volume average diameter. As mentioned above, when the oil droplets of the polymerizable compound are in the form of microcapsules, it is more effective if the particles are larger than the microcapsules. Various image formation accelerators can be used in the photosensitive material.

[0113] The image formation accelerator has the following functions: (1) promoting the movement of base or base precursor, (2) promoting the reaction between the reducing agent and the silver salt, and (2) promoting the immobilization of the dye-donating substance through polymerization. In terms of physicochemical functions, they are classified into the aforementioned bases or base precursors, nucleophilic compounds, oils, heat solvents, surfactants, compounds that interact with silver or silver salts, and compounds that have an oxygen removal function. . However, these substance groups generally have multiple functions and usually have some of the above-mentioned promoting effects. Details of these are described in publications and specifications such as U.S. Pat. Various surfactants can be used in photosensitive materials for the purposes of coating aids, improving peelability, improving slipperiness, preventing electrification, promoting development, and the like. Specific examples of surfactants are described in JP-A-62-173463 and JP-A-62-183457.

[0114] An antistatic agent can be used in the photosensitive material for the purpose of preventing static electricity. Researched as an antistatic agent
Disclosure Magazine, November 1978, No. 1764
No. 3 (page 27), etc. A dye or pigment may be added to the photosensitive layer of the photosensitive material for the purpose of preventing halation or irradiation. JP-A-63-297 regarding a photosensitive material with a white pigment added to the photosensitive layer
There is a description in Publication No. 48.

A dye having the property of being decolored by heating or light irradiation may be contained in the microcapsules of the photosensitive material. 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-63-974940.

When a solvent for a polymerizable compound is used in a photographic material, it is preferably used by encapsulating 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. 6
There is a description in Publication No. 2-209524. A water-soluble vinyl polymer may be adsorbed onto the silver halide grains described above. A photosensitive material using a water-soluble vinyl polymer as described above is described in JP-A-62-91652.

[0117] In addition to the above-mentioned examples, examples of optional components that can be included in the photosensitive layer and how they are used can be found in the application specifications related to the above-mentioned series of photosensitive materials, and in Research Disclosure Magazine Vol. 170,
It is described in No. 17029, June 1978 (pages 9-15). Examples of layers that can be optionally provided on the photosensitive material include an image-receiving layer, a heating layer, an antistatic layer, an anti-curl layer, a peeling layer, a cover sheet or protective layer, an anti-halation layer (colored layer), etc. can.

[0118] Regarding photosensitive materials using a heat generating layer, see JP-A No. 61-294434, and about photosensitive materials provided with a cover sheet or protective layer, see JP-A No. 62-2.
No. 10447 discloses a photosensitive material provided with a colored layer as an antihalation layer, and Japanese Patent Application Laid-Open No. 63-101842.
They are described in the respective publications. 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.

[0119] An image forming method using the photosensitive material of the first embodiment and the photosensitive material of the second embodiment that can be used in the present invention will be described below. First, the case where the photosensitive material of the first embodiment is used will be described. In the case of the photosensitive material of the first embodiment, the step of imagewise exposure, simultaneous with the imagewise exposure,
Alternatively, after imagewise exposure, the photosensitive material is heated from the side of the support on which the photosensitive layer is not coated, and the side of the photosensitive material coated with the photosensitive layer and the image receiving material are overlapped and pressed. An image is formed through a series of steps such as steps.

Various exposure means can be used as the exposure method in the imagewise exposure step, but generally a latent image of silver halide is obtained by imagewise exposure to radiation including visible light. The type of light source and the amount of exposure can be selected depending on the wavelength at which the silver halide is sensitive (in the case of dye sensitization, the sensitized wavelength) and sensitivity.

Typical light sources include natural light, ultraviolet light, visible light, infrared light, fluorescent light, tungsten lamp, mercury lamp, halogen lamp, xenon flash lamp, laser light source (gas laser,
solid state lasers, chemical lasers, semiconductor lasers, etc.)
Examples include light emitting diodes, plasma arc tubes, FOTs, and the like. In special cases, high-energy ray sources such as X-rays, γ-rays, and electron beams can also be used.

[0122] The photosensitive material of the present invention, especially in the case of a full-color photosensitive material, is composed of microcapsules that are sensitive to a plurality of spectral regions, so it is necessary to imagewise expose it using a plurality of corresponding spectral lines. It is. Therefore, one type of the light source may be used or a combination of two or more types may be used. When choosing a light source,
In addition to choosing a light source that is suitable for the sensitive wavelength of the photosensitive material, the choice can also be made by taking into consideration whether image information is transmitted via electrical signals, the processing speed of the entire system, compactness, power consumption, etc.

[0123] When image information does not pass through electrical signals, for example, direct photography of landscapes or people, direct copying of original images,
In the case of exposure through a positive such as a reversal film, a camera, an exposure device for printing such as a printer or an enlarger, an exposure device of a copying machine, etc. can be used. In this case, the two-dimensional image can be exposed simultaneously in a so-called one shot, or can be scanned and exposed through a slit or the like. You can also enlarge or reduce the original image. In this case, the light source is usually not a monochromatic light source such as a laser, but a light source such as a tungsten lamp or a fluorescent lamp, or a combination of multiple monochromatic light sources.

[0124] When image information is recorded via electrical signals, a light emitting diode or various lasers may be used in combination as the image exposure device in accordance with the color sensitivity of the heat-developable color photosensitive material; Various devices known as image display devices (CRT, liquid crystal display, electroluminescent display, electrochromic display, plasma display, etc.) can also be used. In this case, the image information includes an image signal obtained from a video camera or an electronic still camera, a television signal typified by the Nippon Television Signal Standard (NTSC),
Image signals obtained by dividing an original image into many pixels using a scanner or the like, or image signals stored on recording materials such as magnetic tapes or disks can be used.

[0125] When exposing a color image, a combination of LEDs, lasers, fluorescent tubes, etc. is used depending on the color sensitivity of the photosensitive material, but it is also possible to use multiple combinations of the same type, or to use a combination of different types. It's okay. In the photographic field, the color sensitivity of photosensitive materials is R (red), G (green), and B (blue).
Usually, they are photosensitive, but in recent years they are often used in combination with UV, IR, etc., and the range of use of light sources has been expanding. For example, the color sensitivity of a photosensitive material is (G, R, IR)
or (R, IR (short wave), IR (long wave)), (
UV (short wave), UV (medium wave), UV (long wave)), (UV
, B, G) etc. are utilized. The light source may also be a combination of different types, such as a combination of two-color LED and a laser. The above-mentioned arc tube or element may be used for scanning exposure using a single tube or element for each color, or an array may be used to increase the exposure speed. Arrays that can be used include LED arrays, liquid crystal shutter arrays, magneto-optic shutter arrays, and the like.

[0126] As the above-mentioned image display device, CRT
There are color displays and monochrome displays, as shown in Figure 2. However, a method of combining a monochrome display with a filter and performing several exposures may be adopted. Existing two-dimensional image display devices may be used in a one-dimensional manner like FOT, or one screen may be divided into several parts and used in combination with scanning.

By the imagewise exposure step described above, a latent image is obtained on the silver halide contained in the microcapsules. The image forming method of the present invention includes a step of heating in order to thermally develop the photosensitive material simultaneously with or after the imagewise exposure. Preferably, thermal development is carried out by heating the surface of the support on which the photosensitive layer of the photosensitive material is not coated.

[0128] This heating means is disclosed in Japanese Patent Application Laid-Open No. 61-29
As in the photosensitive material described in Japanese Patent No. 4434, a heating layer may be provided on the surface of the support on which the photosensitive layer of the photosensitive material is not coated and heated. Furthermore, as described in JP-A-61-147244, a hot plate, an iron, or a heated roller is used, or as described in JP-A-62-144166, a photosensitive material is sandwiched between a heated roller and a belt. A heating method may also be used.

That is, the photosensitive material may be brought into contact with a heating element having a surface area larger than that of the photosensitive material to heat the entire surface at the same time, or the entire surface of the photosensitive material may be heated simultaneously (heating plate, hot plate, etc.).
The entire surface may be heated over time by scanning with a heated roller, heated drum, etc.). In addition to the above heating method in which the heating element and the photosensitive material are brought into direct contact, it is also possible to heat the photosensitive material in a non-contact manner by applying electromagnetic waves, infrared rays, hot air, etc. to the photosensitive material.

In the image forming method of the present invention, thermal development is performed by heating the surface of the photosensitive material on the support on which the photosensitive layer is not coated. The marked side may be in direct contact with the air, but
It may be covered with a heat insulating material to keep the heat from escaping. In this case, it is preferable not to apply strong pressure (10 kg/cm2 or more) to the photosensitive layer so as not to destroy the microcapsules contained in the photosensitive layer.

[0131] Thermal development by heating may be carried out simultaneously with or after the imagewise exposure, but it is preferable to carry out heating after 0.1 second or more has elapsed after the imagewise exposure. The heating temperature is generally 60°C to 250°C, preferably 80°C to 180°C, and the heating time is between 0.1 seconds and 5 seconds.

The photosensitive material can be thermally developed as described above to polymerize the polymerizable compound in the areas where the silver halide latent image is formed or the areas where the silver halide latent image is not formed. In addition, if a polymerization inhibitor is generated in the area where a latent image of silver halide is formed by reaction with a reducing agent, the polymerization inhibitor may be added to the photosensitive layer in advance, preferably in microcapsules, to initiate thermal or photopolymerization. It is also possible to decompose the agent by heating or irradiating it with light, uniformly generating radicals, and polymerizing the polymerizable compound in the portion where the silver halide latent image is not formed. In this case, in addition to the imagewise exposure step and heat development step described above, a step of heating or exposing the entire surface is required if necessary, but the method is the same as the imagewise exposure step or the heat development step.

[0133] According to the image forming method of the present invention, the unpolymerized polymerizable compound is transferred to the image-receiving material by the step of pressing the photo-sensitive material and the image-receiving material in a superimposed state, on which a polymer image is formed on the photo-sensitive layer. Color images can be obtained on the material. As the above-mentioned pressurizing method, a conventionally known method can be used.

For example, the photosensitive material and the image-receiving material may be sandwiched between press plates such as a presser, or pressure may be applied while conveying them using a pressure roller such as a nip roll. Pressure may be applied intermittently using a dot impact device or the like. Alternatively, highly pressurized air can be blown with an air gun or the like, or the pressure can be applied with an ultrasonic generator, a piezoelectric element, or the like. The pressure required for pressurization is 500 kg/cm2
It is preferably 800 kg/cm2 or more. However, if heating is also used at 40° to 120° C. during pressurization, the pressure may be 300 kg/cm 2 or less.

Next, the case where the second embodiment of the photosensitive material is used will be described. In the case of the second embodiment of the photosensitive material, a series of steps including imagewise exposure and pressing the surface of the photosensitive material coated with the photosensitive layer and the image receiving material are applied. Form an image. Note that the same method as in the first embodiment described above can be used for the imagewise exposure step and the pressurizing step.

The photosensitive material of the present invention has many uses such as color photographing and printing photosensitive materials, printing photosensitive materials, computer graphic hard copy photosensitive materials, and copying machine photosensitive materials. Compact and inexpensive image forming systems such as copying machines, printers, and simple printing machines can be created.

[0137]

EXAMPLES The present invention will be explained in more detail with reference to the following examples, but the present invention is not limited thereto. Examples of the present invention and comparative examples will be described below. Example 1 Preparation of silver halide emulsion (EB-1) 24 g of lime-treated inert gelatin was added to distilled water,
After dissolving at 0° C. for 1 hour, 3 g of NaCl was added, and 1N sulfuric acid was added to adjust the pH to 3.2.

Add the following solutions I and II to this solution for 60 minutes.
pAg = 8 using the controlled double jet method at °C.
．． The solution was added over 45 minutes while maintaining the temperature at 5, until the I solution disappeared. After the addition is complete, adjust the pH to 6 with 1N NaOH.
．． Further, 4.8 mg of (ATR-1) and (
480 mg of SB-1) was added, and 100 g of an aqueous solution containing 4.1 g of KI was added at an equal flow rate over 20 minutes to 3 minutes after the addition.

1.1 g of (CK-1) was added to this emulsion, precipitated, washed with water and desalted, 6 g of lime-treated gelatin was added and dissolved, and a 72% aqueous solution of (ATR-1) 3
cc was added to adjust the pH to 6.2. Average particle size 0
．． 550 g of a monodispersed tetradecahedral silver iodobromide emulsion (EB-1) having a diameter of 24 μm and a coefficient of variation of 20% was prepared.

[0140] Liquid I AgNO3 120g Distilled water 550cc Liquid II KBr 85g
Distilled water 550cc

Preparation of silver halide emulsion (EG-1) Same as silver halide emulsion (EG-1) except that liquid I and liquid II were
The addition time of the liquid was set to 15 minutes, and 450 mg of (SG-1) was added instead of (SB-1). Monodispersed silver iodobromide emulsion with an average grain size of 0.18 μm and a coefficient of variation of 22% (
EG-1) 550g was prepared.

Preparation of silver halide emulsion (ER-1) Same as silver halide emulsion (EG-1) except (SG-1)
instead of (SR-1) 450 mg and (SR-3
) 100 mg was added. Average particle size 0.18μm
, monodispersed silver iodobromide emulsion (ER-1) 5 with a coefficient of variation of 22%
50g was prepared.

[0143]

[Chemical formula 15]

[0144]

[Chemical formula 16]

(CK-1) Poly(isobutylene-co-monosodium maleate)

Preparation of solid dispersion (KB-1) 300ml
110 g of a 5.4% aqueous solution of lime-processed gelatin, polyethylene glycol (average molecular weight 200
0), 20 g of a 5% aqueous solution of base precursor (BG-1
) and 200 ml of glass beads with a diameter of 0.5 to 0.75 mm were added, and the mixture was heated at 3000 rpm using a Dyno Mill.
p. m. Disperse for 30 minutes and adjust the pH to 6.5 with 2N sulfuric acid.
Base precursor (B) with a particle size of 1.0 μm or less
A solid dispersion (KB-1) of G-1) was obtained.

[0147]

[Chemical formula 17]

Preparation of pigment dispersion (GY-1) Microlith Yellow 4GA was added to 255 g of the polymerizable compound (MN-2).
(trade name, manufactured by Ciba Geigy) and stirred for 1 hour at 5000 revolutions per minute using an Eiger motor mill (manufactured by Eiger Engineering).
Y-1) was obtained.

Preparation of pigment dispersion (GM-1) Microrethread 3RA was added to 255 g of the polymerizable compound (MN-2).
(trade name, manufactured by Ciba Geigy) and stirred for 1 hour at 5000 revolutions per minute using an Eiger motor mill (manufactured by Eiger Engineering).
M-1) was obtained.

Preparation of pigment dispersion (GC-1) Copper phthalocyanine (CI) was added to 255 g of the polymerizable compound (MN-1).
Pigment 15) 45g, Solsperse 5000
(manufactured by ICI) 1.13g, Solsperse 24000 (
(manufactured by ICI) were mixed and stirred for 1 hour at 5000 revolutions per minute using an Eiger motor mill (manufactured by Eiger Engineering) to obtain a dispersion (GC-1).

Preparation of photosensitive composition (PB-1) To 45 g of pigment dispersion (GY-1) was added (S) of copolymer (1P-1).
V-1) 9 g of 20% (wt%) solution, (RD-1) 2
．． (SV of 3g, (RD-2) 6.2g, (FF-3)
-1) 1 g of 0.5% (wt%) solution and (ST-1
) was added and dissolved to prepare an oily solution.

Silver halide emulsion (EB-1) was added to this solution.
Add 3.8g and 24g of solid dispersion (KB-1),
The mixture was stirred for 5 minutes at 10,000 revolutions per minute using a 40φ dissolver while keeping the temperature at ℃, to obtain a W/O emulsion photosensitive composition (PB-1).

Preparation of photosensitive composition (PG-1) To 45 g of pigment dispersion (GM-1) was added (S) of copolymer (1P-1).
V-1) 9 g of 20% (wt%) solution, (RD-1) 2
．． (SV of 3g, (RD-2) 3.1g, (FF-3)
-1) 1 g of 0.5% (wt%) solution and (ST-1
) was added and dissolved to prepare an oily solution.

Silver halide emulsion (EG-1) was added to this solution.
Add 3.8g and 24g of solid dispersion (KB-1),
While keeping the temperature at 0° C., the mixture was stirred for 5 minutes at 10,000 revolutions per minute using a 40φ dissolver to obtain a W/O emulsion photosensitive composition (PG-1).

Preparation of photosensitive composition (PR-1) To 45 g of pigment dispersion (GC-1) was added (S) of copolymer (1P-1).
V-1) 9 g of 20% (wt%) solution, (RD-1) 2
．． (SV of 3g, (RD-2) 6.2g, (FF-3)
-1) 1 g of 0.5% (wt%) solution and (ST-1
) was added and dissolved to prepare an oily solution.

Silver halide emulsion (ER-1) was added to this solution.
Add 3.8g and 24g of solid dispersion (KB-1),
While keeping the temperature at 0° C., the mixture was stirred for 5 minutes at 10,000 revolutions per minute using a 40φ dissolver to obtain a W/O emulsion photosensitive composition (PR-1).

[0157]

[Chemical formula 18]

[0158]

[Chemical formula 19]

[0159]

[C20]

Photosensitive microcapsule dispersion (CB-1
) Preparation Add 8.6 g of water to 5.6 g of a 15% aqueous solution of polymer (2P-1).
．． 5 g was added, and the mixed liquid was adjusted to pH 5.0 with 2N sulfuric acid. Add 10% aqueous solution of polymer (2P-2) to this solution.
26g was added and mixed for 30 minutes at 60°C. This mixed solution was added to the photosensitive composition (PB-1) and stirred for 20 minutes at 60° C. and 5000 revolutions per minute using a 40φ dissolver to obtain an emulsion in the form of a W/O/W emulsion. Separately, 20 g of a 37% formaldehyde aqueous solution and 76.3 g of water were added to 14.8 g of melamine, heated to 60° C., and stirred for 40 minutes to obtain a transparent aqueous solution of melamine/formaldehyde initial condensate.

37.5 g of this initial condensate and 7.5 g of water
g was added to the W/O/W emulsion cooled to 25°C, and the pH was adjusted to 5.0 using 2N sulfuric acid while stirring at 1200 rpm with a propeller blade. Next, the temperature of this solution was raised to 70°C for 30 minutes, and the temperature was further increased to 70°C for 30 minutes.
Stirred for 0 minutes. To this, add 40% aqueous solution of urea to 10.3
g was added, the pH was adjusted to 3.5 with 2N sulfuric acid, and stirring was continued at 70°C for an additional 40 minutes. After cooling this liquid to 25°C, the pH was adjusted to 6.5 using a 2N aqueous sodium hydroxide solution to obtain a photosensitive microcapsule dispersion (CB-1) with a capsule wall made of melamine formaldehyde resin.
was prepared.

Photosensitive microcapsule dispersion (CG-1
) Preparation Add 8.6 g of water to 5.6 g of a 15% aqueous solution of polymer (2P-1).
．． 5 g was added, and the mixed liquid was adjusted to pH 5.0 with 2N sulfuric acid. Add 10% aqueous solution of polymer (2P-2) to this solution.
26g was added and mixed for 30 minutes at 60°C. The above-mentioned photosensitive composition (PG-1) was added to this mixed solution, and the mixture was stirred at 60° C. and 5,000 revolutions per minute for 20 minutes using a 40φ dissolver to obtain an emulsion in the form of a W/O/W emulsion. Next, in the same manner as in the preparation of (CB-1), a melamine/formaldehyde initial condensate was added and encapsulated to prepare a photosensitive microcapsule dispersion (CG-1).

Photosensitive microcapsule dispersion (CR-1
) Preparation Add 8.6 g of water to 5.6 g of a 15% aqueous solution of polymer (2P-1).
．． 5 g was added, and the mixed liquid was adjusted to pH 5.0 with 2N sulfuric acid. Add 10% aqueous solution of polymer (2P-2) to this solution.
26g was added and mixed for 30 minutes at 60°C. The above photosensitive composition (PR-1) was added to this mixed solution, and stirred at 50° C. and 5000 rpm for 20 minutes using a 40φ dissolver to obtain an emulsion in the form of a W/O/W emulsion.

Next, in the same manner as in the preparation of (CB-1), a melamine/formaldehyde initial condensate was added and encapsulated to obtain a photosensitive microcapsule dispersion (C
R-1) was prepared. Polymer (2P-1) Potassium polyvinylbenzenesulfinate polymer (2
P-2) Polyvinylpyrrolidone K-90

Preparation of photosensitive material 101 50 g of photosensitive microcapsules (CB-1), (CG-
1) After mixing 50 g of (CR-1), 21.9 g of a 5% aqueous solution of surfactant (WW-1), 27.0 g of a 1% aqueous solution of surfactant (WW-2), and PVA K.
10% of L318 (manufactured by Kuraray, carboxy-modified PVA)
52.5 g of aqueous solution was added and mixed at 40°C.

[0166] This coating solution was applied to the aluminum-deposited surface of a support made of a polyethylene terephthalate film with a thickness of 25 μm to a coating amount of 110 cc/m2 by an extrusion method, and after drying at 60°C, The film was wound up at 65% Celsius so that the coated surface was on the inside. This photosensitive material was sealed in a moisture-proof bag laminated with aluminum under conditions of 25° C. and 55%.

[0167]

[C21]

Preparation of White Pigment Calcium carbonate obtained by the milk of lime-carbon dioxide reaction method, which had been crushed and classified, was sprayed with an aqueous solution containing 1% by weight of sodium stearate, and the mixture was crushed in a steam jet mill. The sodium stearate used was
The amount was 3% by weight based on the dry weight of calcium carbonate.

Preparation of image receiving material (RS-1) Calcium carbonate 80 surface-treated with stearic acid as described above.
0g, surfactant (Poise 520, manufactured by Kao Corporation) 93
．． 0 g and 1107 g of water were mixed and dispersed for 10 minutes at 8000 revolutions per minute using an Ultra Disperser (model HK-41, manufactured by Yamato Scientific Co., Ltd.). This dispersion5.
2 g, 4 g of a 1% aqueous solution of the following surfactant, 52 g of a 10% aqueous solution of polyvinyl alcohol (PVA KL-318, manufactured by Kuraray Co., Ltd.), and 80.5 g of water,
After stirring for 1 hour while keeping the temperature at 25° C., 10 g of a 3% aqueous solution of polyamide epichlorohydrin resin (product name: FL-71; manufactured by Toho Chiba Chemical Industries, Ltd.) was further added and stirred for 30 minutes to form an image-receiving layer. A coating solution was prepared.

[0170]

[C22]

[0171] This coating solution was applied to a paper support with a basis weight of 80 g/m2 (as the fiber length distribution specified by JIS-P-8207, the sum of the weight % of the 24 mesh residue and the weight % of the 42 mesh residue was 30 Paper support using base paper having a fiber length distribution of 60% to 60% [JP-A-63-18623
No. 9]), the image receiving material (RS
-1) was created.

Image Formation The following experiments were carried out at 25°C and 50%. Using a halogen lamp whose color temperature was adjusted to 3100K, the photosensitive material 101 taken out from the moisture-proof bag was heated to continuously change color temperature from 0 to
It was exposed to light at 20,000 lux and for 1 second through a wedge with a transmission density of 4.0, an ND filter with a density of 1.0, and yellow and magenta CC filters (manufactured by Fuji Film) so as to match the gray balance. After 10 seconds of exposure, heat development was carried out for 2 seconds from the side opposite to the coated side of the photosensitive material using a heat developing machine equipped with an exhaust device heated to 150°C.

[0173] After 10 seconds of heating, the image receiving material (RS-1)
The photosensitive material with its coated surfaces overlapped was passed through a pressure roller having a diameter of 3 cm and a pressure of 1200 kg/cm 2 at a speed of 2 cm/sec. When the image-receiving material was peeled off from the photosensitive material immediately after passing, a clear positive image was obtained on the image-receiving material.

Example 2 The procedure was the same as in Example 1 except that rosin acid was used in place of the calcium carbonate surface-treated with stearic acid used in the preparation of the image-receiving material (RS-1) in Example 1. An image-receiving material (RS-2) was prepared in the same manner as in Example 1, except that the same amount of calcium carbonate that had been surface-treated was used. When this image-receiving material (RS-2) was used to form an image in the same manner as in Example 1, a clear positive image was obtained on the image-receiving material.

Examples 3 to 10 In place of the fatty acid-surface-treated calcium carbonate used in the preparation of the image-receiving material (RS-1) of Example 1, white pigments listed in Table 1 (whiteness is determined by the pigment In the same manner as in Example 1, except that the same amount of (indicating whiteness) was used,
Image receiving materials (RS-3) to (RS-10) were prepared. Note that the titanium oxide in Example 9 was surface-treated with sodium stearate in the same manner as in Example 1. Using each of these image receiving materials (RS-3) to (RS-10),
When images were formed in the same manner as in Example 1, clear positive images were obtained on each image-receiving material.

[0176]

[Table 1]

Comparative Example 1 In place of the calcium carbonate surface-treated with fatty acid used in the preparation of the image-receiving material (RS-1) of Example 1, calcium carbonate (Callite SA, Shiraishi Chuo Kenkyu Co., Ltd.) which had not been surface-treated at all was used. An image-receiving material (RS-H1) was prepared in the same manner as in Example 1, except that the same amount of the same amount of the same amount of the same amount of the same amount was used. Example 1 Using this image receiving material (RS-H1)
When an image was formed in the same manner as above, a clear positive image was obtained on the image-receiving material.

Evaluation of image storage stability The density of the image obtained on the image receiving material in Examples 1 to 10 and Comparative Example 1 was measured using X-Rite 310, and the value was taken as D0, and the image receiving material was maintained at a temperature of 60°C. , where the density of the image after 72 hours is D1, the evaluation was performed based on the density reduction rate ΔD expressed by equation 1.

[0179]

[Formula 1]

Table 2 shows Examples 1 to 10 and Comparative Example 1.
The results are summarized below.

[0181]

[Table 2]

From the above, if an image-receiving material using a surface-treated white pigment in the image-receiving layer of the image-receiving material is used according to the image-forming method of the present invention, the image will have good storage stability and be clear. It can be seen that an image is obtained.

Example 11 Preparation of photosensitive microcapsule liquid (CR-2) A photopolymerization initiator (Irgaquiure 6) was added to 45 g of pigment dispersion (GC-1).
51 (manufactured by Ciba Geigy) was dissolved to obtain a photosensitive composition. 15% aqueous solution of polymer (2P-1)5.
6 g and a 7.1% aqueous solution of polymer (2P-2) 134.
The pH of 5 g of the mixed solution was adjusted to 5.0. The above-mentioned photosensitive composition was added to this mixed solution, and the mixture was stirred using a dissolver at 50° C. and 3000 revolutions per minute for 30 minutes to obtain an emulsion in the form of an O/W emulsion. Separately, 20.0 g of a 37% formaldehyde aqueous solution and 76.3 g of distilled water were added to 14.8 g of melamine, heated to 60° C., and stirred for 40 minutes to obtain a transparent aqueous solution of melamine/formaldehyde initial condensate.

40.0 g of this initial condensate aqueous solution and 8 g of water were added to the above O/W emulsion, and 10% of sulfuric acid was added.
The pH was adjusted to 5.0 using an aqueous solution. This was then heated to 60°C and stirred for 30 minutes. Furthermore, 4 of urea
Add 11g of 0% aqueous solution and heat to 60℃ for 40 minutes.
Stir for a minute. Thereafter, the pH was adjusted to 6.5 using a 10% aqueous sodium hydroxide solution to prepare a photosensitive microcapsule dispersion (CR-2) having capsule walls made of melamine formaldehyde resin.

Preparation of photosensitive material 111 51 g of photosensitive microcapsule liquid (CR-2), 6.5 g of a 10% aqueous solution of the above surfactant (WW-1), 1 of the above surfactant (WW-2) % aqueous solution and polyvinyl alcohol (PVA205, manufactured by Kuraray Co., Ltd.)
A coating solution was prepared by mixing 8.3 g of a 20% aqueous solution of. This coating solution was applied at a coating amount of 90 g/m2 onto the aluminum-deposited surface of a support made of a polyethylene terephthalate film with a thickness of 25μ and aluminum deposited at approximately 60°C.
The material was dried to prepare a photosensitive material 111 used in the present invention.

[Image Formation] The photosensitive material 111 was exposed to light using a 200 W high-pressure mercury lamp from a distance of 30 cm for 20 seconds through a step wedge. Next, the photosensitive material 111 and the image-receiving material were layered together with the image-receiving material (RS-1) used in Example-1, and passed through a pressure roller with a diameter of 50 mm and a pressure of 1000 kg/cm2 to peel off the image-receiving material. A cyan positive image was obtained depending on the exposure amount. Examples 12 to 20 Instead of the image receiving material (RS-1) used in Example 11,
Example 1 except that each of the image receiving materials listed in Table 3 was used.
When images were formed in the same manner as in Example 1, clear cyan positive images were obtained on each image-receiving material.

[0187]

[Table 3]

Comparative Example 2 Image receiving material (RS
When an image was formed in the same manner as in Example 11 except that an image-receiving material (RS-H1) was used instead of -1), a clear cyan positive image was obtained on the image-receiving material. Example 11~
Evaluation of the image storage properties on the image-receiving materials of Example 20 and Comparative Example 2 was carried out in the same manner as in Examples 1 to 10 and Comparative Example 1. The results are summarized in Table 4.

[0189]

[Table 4]

From the above, if an image-receiving material using a surface-modified white pigment in the image-receiving layer of the image-receiving material is used according to the image-forming method of the present invention, the image will have good storage stability and be clear. It can be seen that an image is obtained.

Claims (3)

[Claims] 1. An image-receiving material comprising, on a support, an image-receiving layer containing at least a white pigment surface-treated with fatty acid or rosin acid. 2. Image-wise polymerization of a polymerizable compound of a photosensitive material having a photosensitive layer on a support containing microcapsules encapsulating at least a polymerizable compound, a pigment, a reducing agent, and a photosensitive silver halide. After that, an image is formed on the image-receiving material by applying pressure while the photosensitive material is superimposed on an image-receiving material containing a white pigment surface-treated with fatty acid or rosin acid in at least the image-receiving layer. An image forming method. 3. After image-wise polymerizing a polymerizable compound of a photosensitive material having a photosensitive layer containing microcapsules encapsulating at least a photopolymerization initiator, a pigment, and a polymerizable compound on a support, at least an image-receiving layer is formed. An image forming method characterized by forming an image on the image-receiving material by pressing an image-receiving material whose layer contains a white pigment surface-treated with fatty acid or rosin acid and the photosensitive material in a state in which the photosensitive material is superimposed. .