JPH0422960A - Image forming method and device capable of improving unevenness of development - Google Patents

Abstract

PURPOSE:To reduce various kinds of unevenness occurring at the time of heating development and to obtain a color image having excellent image quality by providing the stage of preliminary heat development of the temperature of which is higher than that of heat development by at least >= 5 deg.C before the stage of heat development. CONSTITUTION:At least one stage of preliminary heat development of the temperature of which is higher than that of the heat development by >= 5 deg.C is provided before the stage of heat development. Namely, the temperature in the case of heat development is 50-200 deg.C, desirably 80-180 deg.C, and it is desirable that the temperature of preliminary heating is higher than that of the heat development by at least >=5 deg.C, desirably >=10 deg.C. Then, the heat development time is >=1 second and <=5 minutes, desirably >=1 second and <=1 minute, and it is desirable to set the preliminary heating time at 1/2, desirably 1/3, of the heat development. Thus, the preliminary heating is performed at a temperature at which basic precursor is thoroughly decomposed and in a short time that the next stage of development is not started, so that the temperature dependency of the basic precursor is reduced, the unevenness occurring at the time of heat development is reduced and the image having little variation of density is obtained.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a photosensitive material containing microcapsules containing at least silver halide, a reducing agent, a color image forming substance, a polymerizable compound, and a base precursor on a support. When creating a color image by image exposure, heat development, and pressure transfer using a layered photosensitive material and image-receiving paper, there is little unevenness that occurs during heat development, and there is no change in density due to temperature fluctuations during heat development. The present invention relates to an image forming method and an image forming apparatus for obtaining fewer images.

[Prior Art] A photosensitive layer containing at least microcapsules (photosensitive microcapsules) containing silver halide, a reducing agent, a color image forming substance, a polymerizable compound, and a base precursor is imagewise exposed to form a latent image. Thereafter, this is heat-developed to polymerize the polymerizable compound in the area where the latent image has been formed, and then the photosensitive material is overlapped with image-receiving paper and pressure is applied in this state to release the capsules in the unpolymerized area. 2. Description of the Related Art A method is known in which a stored object is transferred to image-receiving paper to obtain a transferred image on the image-receiving paper. (Unexamined Japanese Patent Publication No. 61-27574 and No. 61-278
(No. 849) On the other hand, a method of polymerizing the polymerizable compound in the area where no latent image was formed is disclosed in JP-A No. 62-70836.
It is stated in the No.

To start this heat development, for example, when using an acid part thermal decomposition type (described later) base precursor,
It is necessary that the base precursor acid moiety decomposes and the inside of the photosensitive microcapsule becomes substantially basic. In addition, when storing unused photosensitive materials at room temperature,
This base precursor degrades upon storage at room temperature and begins to develop during storage, resulting in undesirable color image degradation.

Therefore, in order to be stable when stored at room temperature and to cause sufficient development when heated, the activation energy for decomposition of the base precursor must be large.

Naturally, unevenness in the way heat is applied during heat development will cause uneven color images, and variations in heat development temperature will cause density variations.

In order to obtain color images with excellent image quality, it is essential to reduce various types of unevenness that occur during heat development.

[Structure of the Invention] This problem is solved by imagewise exposure of a photosensitive material having a photosensitive layer containing microcapsules containing at least silver halide, a reducing agent, a color image forming substance, a polymerizable compound, and a base precursor on a support. After that, in an image forming step including a heat development step, a step of overlapping the photosensitive material with an image receiving paper, a step of applying pressure in this state, and a step of peeling the photosensitive material and the image receiving paper, before the heat development step, Significant improvements can be made by an image forming method and apparatus that includes at least one preheating development step at a temperature of at least 5° C. or higher than heat development.

As mentioned above, the temperature dependence of the base precursor decomposition process is large, and development is directly controlled by it, and local temperature unevenness leads to fluctuations in density. However, it is believed that the reason for the effect of the present invention is that the temperature dependence of the base precursor can be reduced by performing preheating at a temperature at which the base precursor sufficiently decomposes and for a short time during which the next development step does not occur. Further, the amount of water present during heat development is also a factor that affects development, and the fact that water is not removed by preheating is also considered to be the reason for the effects of the present invention.

It is known that preheating is performed for the purpose of removing water. However, in the present invention, preheating is required to be performed at a temperature higher than the temperature of heat development, and preheating is simply performed to remove water. In this case, the effect of the present invention cannot be obtained.

<Detailed Description of the Invention> The silver halide used in the photosensitive material of the present invention will be described below.
The reducing agent, pigment, polymerizable compound, base precursor, microcapsule, and support will be explained in detail.

The light-sensitive material of the present invention includes silver chloride, silver chloride,
Any grains of silver bromide, silver iodide, silver chlorobromide, silver chloroiodide, silver iodobromide, or silver chloroiodobromide can be used.

Silver halide grains used in photographic emulsions include those with regular crystals such as cubes, octahedrons, and dodecahedrons, those with irregular crystal systems such as spherical and plate shapes, and those with twin planes. may have crystal defects, or a composite form thereof.

The grain size of the silver halide may be fine grains of about 0.01 microns or less, or large grains with a projected area diameter of up to about 10 microns, and may be used in polydisperse emulsions as described in US Pat.
Monodisperse emulsions such as those described in British Patent No. 574.628, British Patent No. 3.655.394 and British Patent No. 1,413.748 may also be used.

Tabular grains having aspect ratios of about 5 or more can also be used in the present invention. Tabular grains are described by Gutoff, Photographic Science and Engineering.
ence and Engineering), Vol. 14, p. 248'257 (1970); U.S. Patent Box 4
．． No. 434226, No. 4,414,310, No. 4,4
33.048, 4,439,520, and British Patent No. 2.112.157.

The crystal structure may be --like, the inside and outside may have different halogen compositions, it may be a layered structure, or silver halides with different compositions may be joined by epitaxial bonding. It may also be bonded with a compound other than silver halide, such as silver rhodan or lead oxide. Furthermore, two or more types of silver halide grains having different halogen compositions, 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) N1117643
(December 1978), pp. 22-23, “■, Emulsion preparation and
dtypes)”, and Nct18716 (1
(November 979), p. 64B, 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 Research Disclosure Sou 17
643 and No. 18716, and the relevant parts are summarized in the table below.

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

d RD17643 uLflnL chemical sensitizer Page 23 Page 648 Right column Sensitivity enhancer Same as above Photosensitizer 2
Pages 3-24 Page 648 Right column - Super sensitizer
Page 649 right column anti-fog agent 24-2
Page 5, page 649, right column and stable side
It is preferable to use silver halide grains having a relatively low fog value, such as the light-sensitive material described in Japanese Patent No. 8830.

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. For details, please refer to JP-A-62-20
There are descriptions in Japanese Patent Application No. 9450, No. 63-287844, and Japanese Patent Application No. 1-37782.

The reducing agent that can be used in the light-sensitive 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 above reducing agents include hydroquinones, catechols, P
-Aminophenols, P-phenylenediamines, 3
-Pyrazolidones, 3-aminopyrazoles, 4-amino-5-pyrazolones, 5-aminouracils, 4゜5
-dihydroxy-6-aminopyrimidines, reductones, amyl reductones, 0- or p-sulfonamidophenols, 0- or p-sulfonamidonaphthols, 2.4-disulfonamidophenols, 2.4
-Disulfonamide naphthols, 0- or p-acylaminophenols, 2-sulfonamide indanones, 4-sulfonamide-5-pyrazolones, 3-sulfonamide indoles, sulfonamide pyrazolobenzimidazoles, sulfones Examples include amidobiran lotriazoles, α-sulfonamide ketones, and hydrazines. By adjusting the type, amount, etc. of the reducing agent, it is possible to polymerize the polymerizable compound in either the area where the silver halide latent image is formed or the area where no latent image is formed. In addition, in the system where the polymerizable compound is polymerized in the area where the silver halide latent image is not formed,
Particularly preferred reducing agents are 1-phenyl-3-pyrazolidones, hydroquinones, and sulfonamidophenols.

Regarding various reducing agents having the above functions, please refer to JP-A-61-183640, JP-A No. 61-188535, and JP-A-61-188535.
Publications No. 1-228441 and JP-A-62-7
No. 0836, No. 61-86354, No. 62-8635
No. 5, No. 62-206540, No. 62-264041
No. 62-109437, No. 63-254442, Japanese Patent Application No. 63-97379, No. 63-296774, No. 63-296775, Japanese Patent Application No. 1-27175,
1-54101, 1-91162, 1=90
It is described in publications such as No. 087 and specifications. (including those described as developing agents or hydrazine derivatives) and the above-mentioned reducing agents are described in Tjmames, “
τhe Theory of the Pho
tographicProcess'' 4th edition, 291~
334 pages (1977) Research Disclosure Magazine Vol. 1.170. No. 17029, June 1978 (
9-15), and the same magazine Vol. 176. No. 17643 (December 1978) (pages 22-31). Furthermore, as in the photosensitive material described in JP-A-62-210446, a reducing agent 1 precursor capable of releasing the reducing agent under heating conditions or in contact with a base may be used instead of the reducing agent. Good too. 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, "reducing agent J" in this specification includes the reducing agents and reducing agent precursors described in each of the above-mentioned publications, Akira MM, 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, but as described in each of the above specifications, two or more types of reducing agents may be used in combination. When two or more types of reducing agents are used together, the interaction of the reducing agents is, first, to promote the reduction of silver halide (and/or organic silver salt) through so-called superadditivity; , silver halide (
and/or an organic silver salt) to cause the polymerization of a polymerizable compound (or inhibit the polymerization ), etc. are possible. 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.

C.B.

L H CHl C)+3 H OC+al(+z fi3 CJs (lO) The amount of reducing agent added can vary widely, but is generally 0.1-1500 mol%, preferably 10-1500 mol% based on the silver salt.
It is 300 mol%.

As for the pigments used in the present invention, in addition to commercially available pigments, known pigments described in various documents can be used.Regarding literature, Color Index (C, 1,) Handbook,
These include "Latest Pigment Handbook 1 Japan Pigment Technology Association! I" (published in 1977), "Latest Pigment Application Technology J" published by CMC Publishing (published in 1986), and "Printing Ink Technology J" (published by CMC Publishing in 1984).

By color, the types of pigments include white pigments, black pigments, yellow pigments, orange pigments, brown pigments, red pigments, purple pigments, blue pigments, green pigments, fluorescent pigments, metal powder pigments, and others.
Included are polymer-bound dyes.

Specifically, insoluble azo pigments, azo lake pigments, condensed azo pigments, chelate azo pigments, phthalocyanine RF4,
anthraquinone pigments, perylene and perinone pigments,
Thioindigo-based RF4, quinacridone-based pigments, dioxazine-based pigments, isoindolinone-based pigments, quinophthalone-based pigments, dyed with lake pigments, azine pigments, nitroso pigments,
Nitro-In, 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 surface coating with resin or wax;
Possible methods include attaching a surfactant and bonding a reactive substance (for example, silane coupling, epoxy compound, polyisocyanate, etc.) to the pigment surface, which are described in the following documents.

Properties and Applications of Metallic 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 is 0 after being dispersed in a polymerizable compound. .01μ~1
A range of 0.1/μ is preferable, and a range of 0.05 to 1 μm is more preferable.

The amount of pigment is 10 to 60 parts by weight per 100 parts by weight of the polymerizable compound.
It is preferable to use parts by weight.

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, an attritor bar mill, a super mill, a ball mill, an impeller, a desparzer-1KD mill, a colloid mill, a guinatron, a three-roll mill, and a pressure kneader. Details are described in "Latest Pigment Application Technology" (CMC Publishing, 1986).

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 with 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, methacrylamides, and maleic anhydride. acids, maleic esters, itaconic esters, styrenes, vinyl ethers, vinyl esters, N-vinyl heterocycles, diallyl ethers,
These include allyl esters and their derivatives.

Specific examples of polymerizable compounds that can be used in photosensitive materials include n-butyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, hensyl acrylate, furfuryl acrylate, and ethoxyethoxy. Ethyl acrylate, tricyclodecanyloxyacrylate, 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 cyacrylate, 2-(
2-hydroxy-1,1-dimethylethyl)-5,5-
Examples include dihydroxymethyl-1,3-dioxane triacrylate, triacrylate of a propylene oxide adduct of trimethylolpropane, polyacrylate of hydroxypolyether, polyester acrylate, and polyurethane acrylate.

Other specific examples of methacrylic acid esters include methyl methacrylate, butyl methacrylate, ethylene glycol dimethacrylate, butanediol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, Mention may be made of methacrylate and dimethacrylate to polyoxene alkylenated bisphenol.

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

The base precursors that can be used in the photosensitive material of the present invention include base precursors of inorganic bases and organic bases (
(decarboxylation type, thermal decomposition type, reaction type, complex salt forming type, etc.) can be used.

Preferred base precursors include JP-A-59-18
No. 0549, No. 59-180537, No. 59-195
No. 237, No. 61-32844, No. 61-36743
No. 61-51140, No. 61-52638, No. 61-52639, No. 61-53631, No. 61-
No. 53634, No. 61-53635, No. 61-536
No. 36, No. 61-53637, No. 61-53638, No. 61-53639, No. 61-53640, No. 6
No. 1-55644, No. 61-55645, No. 61-5
No. 5646, No. 61-84640, No. 61-1072
No. 40, No. 61-219950, No. 61-25184
No. 0, No. 61-252544, No. 61-313431
Salts of organic acids and bases that are decarboxylated by heating as described in Japanese Patent Application Nos. 63-316740, 64-68746, and Japanese Patent Application No. 62-209138; Compounds that eliminate bases by heating as described in Publications No. 59-166943 and No. 63-96159 may be mentioned.

The base precursor of the present invention includes 50'C to 2
It is preferable to release the base at 00°C, and at 90°C to 1
It is more preferable to release at 80°C.

Further, a method of releasing a base using a reaction is described in Japanese Patent Application Laid-Open No. 63-25208 and Japanese Patent Application No. 137803-1983. Furthermore, a method of generating a base by electrolysis is described in JP-A-61-232451.

The base precursor used in the photosensitive material of the present invention is preferably a base precursor consisting of a salt of a carboxylic acid and an organic base as shown below and having a solubility in water at 25° C. of 1% or less.

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

[In the above formula (1), R1, R12°R'! and RI' 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; may have the above substituents), and RII, RI2, R'' and R
Any two groups selected from I4 may be bonded to each other to form a three- or six-membered nitrogen-containing heterocycle.] (b) the base precursor consists of a salt of a carboxylic acid and an organic base, The organic base has two to four partial structures corresponding to atomic groups obtained by removing one or two hydrogen atoms from guanidine represented by the following formula (2), and a diacid to four partial structures consisting of a linking group of the partial structures. It is an acid base.

\2... [Formula (2) above, Bza and Bts each represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group,
represents a monovalent group selected from the group consisting of an aralkyl group, an aryl group, and a heterocyclic residue (each group may have one or more substituents), R1+422, R1
, R24o, and RtS may be bonded to each other to form a three- or six-membered nitrogen-containing heterocycle] Note that the base precursors of (a) and (b) above JP-A No. 63-31670, respectively.
No. 64-68746.

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

Day CH.

Hs CH.

H ■8 CH.

H Various known techniques can be applied to the microcapsules of the present invention, although there are no particular restrictions.

Examples include U.S. Pat.
No. 800458: Method using coacervation of hydrophilic wall-forming materials; U.S. Patent No. 32871
54 and British Patent No. 990443, and interfacial polymerization methods described in Japanese Patent Publication Nos. 38-19574, 42-446, and 42-771; specifications of U.S. Patent Nos. 3418250 and 3660304. Method by polymer precipitation of graphite numbers; US Pat. No. 3,796
Methods using isocyanate-polyol wall materials described in '669; Methods using isocyanate wall materials described in U.S. Pat. No. 3,914,511; U.S. Pat.
No. 001140, No. 4087376, No. 4089
No. 802 and No. 4025455, JP-A-62-2
No. 09439, JP-A-64-91131, JP-A-1-
There is a method using amino aldehyde resins described in No. 154140 and Japanese Patent Application No. 63-241635.

Examples of amino aldehyde resins include urea-formaldehyde resin, urea-formaldehyde-resorcinol resin, melamine-formaldehyde resin, acetoguanamine-formaldehyde resin, benzoguanamine-formaldehyde resin, and the like.

Also, Japanese Patent Publication No. 36-9168 and Japanese Patent Publication No. 51-90
No. 79 in 5it by polymerization of monomers on each public device
U method; British Patent No. 927807 and British Patent No. 96507
Polymerization dispersion cooling method described in each specification of No. 4; US Patent No. 311
Examples include the spray drying method described in No. 1407 and British Patent No. 930422. The method of microencapsulating oil droplets of a polymerizable compound is not limited to the above, but a method of emulsifying a core material and then forming a polymer film as a microcapsule wall is preferred. For photosensitive materials using microcapsules with outer shells made of polyester resin, see JP-A-62-209437, and for photosensitive materials using microcapsules with outer shells made of polyurea resin and/or polyurethane resin. JP-A No. 62-209438 describes a photosensitive material using microcapsules having an outer shell made of gelatin, and JP-A No. 62-209440 describes a photosensitive material using microcapsules having an outer shell made of epoxy resin. Regarding the materials, see Japanese Patent Application Laid-Open No. 62-209441,
Regarding a photosensitive material using microcapsules having a composite resin outer shell containing a polyamide resin and a polyurea resin, Japanese Patent Application Laid-Open No. 62-209447 describes a photosensitive material using a microcapsule having a composite resin outer shell containing a polyurethane resin and a polyester resin. For photosensitive materials, see JP-A-62-20
Each of these is described in Publication No. 9442.

In the present invention, it is particularly preferable to use a melamine formaldehyde resin, since it is possible to obtain highly dense capsules.

In addition, Japanese Patent Application No. 1-37782 discloses that in order to obtain capsules with especially excellent wall density, a reaction product of a water-soluble polymer having a sulfinic acid group and a polymerizable compound having an ethylenically unsaturated group is used. Microcapsules are disclosed in which a polymer wall of a high molecular compound is provided around a membrane made of the following microcapsules, which are preferably used in the present invention.

In addition, when using aminoaldehyde-based microcapsules, it is preferable to keep the amount of residual aldehyde below a certain value, as in the photosensitive material described in JP-A-63-32535.

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

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

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.For photosensitive materials containing silver halide in the wall material of the microcapsules, Japanese Unexamined Patent Publication 1986
There is a description in the publication No.-169147.

In the present invention, when the base precursor is accommodated in microcapsules, a photosensitive composition in which the base precursor is directly solid-dispersed in a polymerizable compound may be used (Japanese Patent Laid-Open No. 32251/1983, Japanese Patent Application No. 63/1988). It is particularly preferable to use a photosensitive composition in which a base precursor is dispersed in water and emulsified in a polymerizable compound.
(Japanese Patent Application No. 1-160148) Here, it is preferable to use a nonionic or amphoteric water-soluble polymer when dispersing the base precursor in water.

Examples of nonionic water-soluble polymers include polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polymethyl vinyl ether, polyacryloylmorpholine, polyhydroxyethyl acrylate, polyhydroxyethyl methacrylate-coacrylamide, hydroxyethylcellulose, hydroxypropylcellulose, and methylcellulose. etc. can be mentioned.

Moreover, gelatin can be mentioned as an amphoteric water-soluble polymer.

The above water-soluble polymer has 0
．． The base precursor is preferably contained in a proportion of 1 to 100% by weight, more preferably 1 to 50% by weight.
~60% by weight, preferably 10~50% by weight
It is more preferable that the base precursor is contained in an amount of 2 to 50% by weight based on the polymerizable compound.
It is preferably contained in a proportion of 5 to 30% by weight.
It is more preferable that the content be in a proportion of .

In the production of the photosensitive microcapsules of the present invention, when an oily liquid containing a base precursor and a pigment is dispersed in an aqueous medium to form the outer shell of the capsule, the aqueous medium contains:
Preferably, a non-ionic water-soluble polymer is included, in which case the oily liquid has a molecular weight of 10
-120 weight% is preferable, and 20-90 weight% is more preferable.

Examples of nonionic water-soluble polymers include polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polymethyl vinyl ether, polyacryloylmorpholine, polyhydroxyethyl acrylate, polyhydroxyethyl methacrylate-coacrylamide, hydroxyethylcellulose, hydroxypropylcellulose, and methylcellulose. etc. can be mentioned.

In addition, in order to efficiently disperse a hydrophobic core substance containing an oily liquid into microdroplets in an aqueous medium, it is necessary to use an anionic water-soluble polymer in combination with the above-mentioned nonionic water-soluble polymer. preferable.

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.

Examples of anionic water-soluble polymers include polystyrene sulfinic acid, styrene sulfinate copolymers,
Examples include polystyrene sulfonate, styrene sulfonic acid copolymer, polyvinyl sulfate ester salt, polyvinyl sulfonate, maleic anhydride/styrene copolymer, maleic anhydride/isobutylene copolymer, and the like.

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.

Although there are no particular limitations on the support for the photosensitive material of the present invention,
It is preferable to use a material that can withstand the processing temperature during development.

When a polymer film, particularly a polycarbonate or polyethylene terephthalate film, is used as the support, it is preferable to provide an undercoat layer as described in JP-A-61-113058. In order to make these films electrically conductive as a countermeasure against static electricity, aluminum, indium oxide, or the like can be deposited and used. Further, the thickness of the support is preferably thin as long as it has sufficient heat resistance. The thickness is 300μm or less,
The thickness is preferably 120 μm or less.

In addition, when using a porous support such as paper, Japanese Patent Application Laid-Open No. 62
-209529, 63-38934, 63-8
No. 1339, No. 63-81340, No. 63-9794
Supports described in publications such as No. 1, No. 64-88543, and No. 64-88544 can be used.

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

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.

In the present invention, an organic metal salt can also 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 organic silver salt oxidation side include U.S. Pat.
There are benzotriazoles, fatty acids, and other compounds described in 53w and the like. Furthermore, silver salts of carboxylic acids having an alkynyl group such as silver phenylpropiolate described in JP-A-60-113235, and JP-A-61-24904
Acetylene silver described in each publication No. 4 and No. 64-57256 can also be used. Two or more types of organic silver salts may be used in combination.

The above-mentioned organic silver salts contain, per mol of photosensitive silver halide,
0.01 to 10 mol, preferably 0.01 to 1
Moles can be used together. The total coating amount of photosensitive silver halide and organic silver salt is 1 to 10g1rd in terms of silver.
is appropriate.

The anti-smudge agent used in photosensitive materials is preferably a particulate material that is solid at room temperature.
Starch particles described in the specification of No. 232347, fine polymer powders described in the specification of US Pat. No. 3,625,736, etc., microcapsule particles not containing a coloring side as described in the specification of British Patent No. 1,235,991, etc., and US Pat. No. 2,711,375. Examples include inorganic particles such as cellulose fine powder, talc, kaolin, bentonite, waxite, zinc oxide, titanium oxide, and alumina. The average particle size of the 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.

Image formation accelerators have functions such as ■ promoting the movement of bases or base precursors, promoting the reaction between reducing agents and silver salts, and promoting immobilization of dye-donating substances through polymerization. are classified into the aforementioned bases or base precursors, nucleophilic compounds, oils, heat solvents, surfactants, compounds that interact with silver or silver salts, compounds that have an oxygen scavenging function, and the like. However, these substance groups generally have multiple functions and usually have some of the above-mentioned promoting effects. For more information on these, see U.S. Pat.
, 678,739 No. 38-4011, JP-A-62-2
It is described in publications such as No. 09443 and specifications.

In photosensitive materials, in systems that polymerize polymerizable compounds in areas where latent images of silver halide are not formed, the purpose is to initiate polymerization or to polymerize unpolymerized polymerizable compounds after image transfer. A thermal or photopolymerization initiator can be used.

Examples of thermal polymerization initiators include azo compounds, organic peroxides,
Examples include inorganic peroxides and sulfinic acids. Details of these are described in pages 6 to 18 of "Addition Polymerization/Ring-Opening Polymerization J" (1983, Kyoritsu Shuppan) by Yoshin, editor of the Society of Polymer Science, Polymer Experiments.

Examples of photopolymerization initiators include benzophenones, acetophenones, benzoins, thioxansones, and the like. For details on these, please refer to “Ultraviolet Curing System J (1989, General Treatment Center) No. 6”
It is described on pages 3 to 147, etc.

Various hardening agents can be used in photosensitive materials.

Specific examples include aldehyde hardeners, azisodine hardeners, epoxy hardeners, vinyl sulfone hardeners, N-methylol hardeners, and polymer hardeners.

For more information on these, see U.S. Patent No. 4.678,73.
No. 9, column 41, JP-A-59-116655, JP-A No. 62-
No. 245261, No. 61-18942, No. 62-23
There are descriptions in various publications such as No. 4157.

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 given in JP-A-62-1
It is described in No. 73463, No. 62-183457, etc.

An antistatic agent can be used in the photosensitive material for the purpose of preventing static electricity.

Research Disclosure Magazine 1978 as an antistatic agent
It is described in No. 17643 (page 27) of November 2013.

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-63-29748 describes a photosensitive material in which a white pigment is added to the photosensitive layer. be.

When the photosensitive layer of the photosensitive material uses the above-mentioned microcapsules, the microcapsules may contain a dye that can be decolored by heating or light irradiation. The dye having the property of being decolored by heating or light irradiation can function as a yellow filter in a conventional silver salt photographic system.

Regarding photosensitive materials using dyes having the property of decolorizing by heating or light irradiation as mentioned above, Japanese Patent Application Laid-Open No. 63-9
There is a description in Publication No. 74940.

When using a solvent for a polymerizable compound in a photosensitive material, it is preferable to encapsulate the solvent in a microcapsule separate from the microcapsule containing the polymerizable compound. For photosensitive materials using organic solvents, see Japanese Patent Application Laid-Open No. 62-2095.
There is a description in Publication No. 24. A photosensitive material using a water-soluble vinyl polymer as described above, which may be used by adsorbing a water-soluble vinyl polymer onto the silver halide grains mentioned above, is described in JP-A-62-91652.

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

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

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 release layer,
Examples include a cover sheet or a protective layer, a Halley sheen prevention layer (colored layer), and the like.

Instead of using an image-receiving material, the image-receiving layer may be provided on the photo-sensitive material and an image may be formed on this layer. It can be configured as follows.

Regarding photosensitive materials using a heat generating layer, Japanese Patent Application Laid-open No. 1983
For photosensitive materials provided with a cover note or protective layer, see JP-A No. 62-210447, and for photosensitive materials provided with a colored layer as an antihalation layer, see JP-A No. 63-101842. , respectively. 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.

Various antifoggants or photographic stabilizers can be used in the present invention. An example is RD176
43 (1978) pages 24-25, nitrogen-containing carboxylic acids and phosphorus Ill described in JP-A-51-168442, or mercapto compounds and phosphorus Ill described in JP-A-59-111636. Metal salts thereof, acetylene compounds described in JP-A No. 62-87957, and the like can be used.

For photosensitive materials, there are various processing temperatures and processing times during development.
Various development stoppers can be used for the purpose of always obtaining a constant image.

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

Specifically, an acid precursor that releases acid upon heating;
Examples thereof include electrophilic compounds that undergo a substitution reaction with a shared base upon heating, nitrogen-containing heterocyclic compounds, mercapto compounds, and precursors thereof.

For more details, see JP-A No. 62-253159 (31) - (
32), Japanese Patent Application No. 1-72479, Japanese Patent Application No. 13471, etc.

The photosensitive material of the present invention is used to form an image according to the usage method described below, and an image-receiving material is generally used.

The image receiving material will be explained below.

The image-receiving material may be a support only, or an image-receiving layer may be provided on the support.

Supports for image-receiving materials are not particularly limited, but like the supports for photosensitive materials, glass, paper, high-quality paper, baryta paper, coated paper, cast-coated paper, synthetic paper, metals and their analogues, and polyester can be used. , polyethylene, polypropylene, acetyl cellulose, cellulose ester, polyvinyl acetal, polystyrene, polycarbonate,
Examples include films such as polyethylene terephthalate, and papers laminated with resin materials and polymers such as polyethylene.

Note that when a porous material such as paper is used as the support for the image-receiving material, it is preferable that the material has a certain level of smoothness as in the image-receiving material described in JP-A-62-209530. Further, an image receiving material using a transparent support is described in JP-A-62-209531.

The image-receiving layer of the image-receiving material is composed of a white pigment, a binder, and other additives, and the white pigment itself or the voids between the particles of the white pigment increase the receptivity of the polymerizable compound.

Examples of white pigments used in the image-receiving layer include inorganic white pigments such as oxides such as silicon oxide, titanium oxide, zinc oxide, magnesium oxide, and aluminum oxide, magnesium sulfate, barium sulfate, calcium sulfate, magnesium carbonate, and barium carbonate. , alkaline earth metal salts such as calcium carbonate, calcium silicate, magnesium hydroxide, magnesium phosphate, magfusium hydrogen phosphate, etc., as well as aluminum silicate, aluminum hydroxide, zinc sulfide, various clays, talc, kaolin, Examples include zeolite, acid clay, activated clay, and glass.

As organic white pigments, polyethylene, polystyrene,
Examples include 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 for polymerizable compounds are preferred.

Further, as the binder used in the image-receiving layer of the present invention, water-soluble polymers, polymer latexes, polymers soluble in organic solvents, and the like can be used. As a water-soluble polymer,
For example, cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, and methylcellulose, proteins such as gelatin, phthalated gelatin, casein, and ovalbumin, starches such as dextrin and etherified starch, polyvinyl alcohol, polyvinyl alcohol partial acetal, and poly-N- vinylpyrrolidone,
Polyacrylic acid, polymethacrylic acid, polyacrylamide, polyvinylimidazole, polyvinylpyrazole,
Examples include synthetic polymers such as polystyrene sulfonic acid, 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 ester and/or methacrylic ester polymer or copolymer latex, and ethylene/vinyl acetate copolymer latex. etc.

Examples of polymers soluble in organic solvents include polyester resins, polyurethane resins, polyvinyl chloride resins, polyacrylonitrile resins, and the like.

As for how to use the above-mentioned binders, two or more types can be used in combination, and furthermore, the two types of binders can also be used in combination in such a ratio that phase separation occurs. An example of such usage is described in Japanese Patent Application Laid-open No. 1-154789.

The average particle size of the white pigment is 0.1~20μ, preferably O11~10μ, and the coating amount is 0.1g~60g.
1 Preferably, it is in the range of 0.5 g to 30 g. The weight ratio of white pigment and binder is 0 binder to 1 pigment.
．． The range is preferably from 0.01 to 0.4, and more preferably from 0.03 to 0.3.

The method of using the photosensitive material will be described below.

The photosensitive material is used by preheating at the same time as imagewise exposure, before or after imagewise exposure, and then heat development.

As the exposure method mentioned above, various exposure means can be used. It is necessary to expose with light corresponding to the spectral sensitization wavelength of the encapsulated silver halide emulsion.

Typical color image applications include capsules containing silver halide emulsions sensitive to blue, capsules containing silver halide emulsions sensitive to green, and capsules containing silver halide emulsions sensitive to red. A mixture of three types is used.

In this case, the normal color original can be used as a material for copying. Furthermore, it can be used as a photosensitive material for printers using CRT (color) based on image information.

It is also possible to use a silver halide emulsion sensitive to infrared light and use an infrared semiconductor laser or LED as the exposure light source.

As the above-mentioned preheating and heat development methods, various conventionally known methods can be used. In particular, for preheating, there are two methods: using a conventional heating plate or heat roller; using a drum-shaped heater to heat the photosensitive material by pressing it against the surface of the drum; and installing a heat-generating layer on the back of the photosensitive material and energizing it. In addition to the method of heating using Joule heat, there are methods of using a heat-sensitive recording head, methods of heating with a far-infrared heater, etc.
A method such as heating with laser light can be used.

The temperature of heat development is 50°C to 200°C, preferably 8°C.
The temperature is 0°C to 180°C, and preheating is performed by heating and developing.
It is desirable that the temperature is at least 5° C. or higher, preferably 10° C. or higher, and the heat development time is 1 second or more and 5 minutes or less, preferably 1 second or more and 1 minute or less. The preheating time is 1/2 or less, preferably 1/3 or less of the heat development time.

In the photosensitive material, the silver halide emulsion is developed by preheating and heat development, and when the polymerization initiator is released, the polymerizable compound in the capsule in the exposed area is polymerized.

Conversely, when a silver halide emulsion is developed with a capsule containing a thermally polymerizable compound, if a polymerization inhibitor is generated, the polymerizable compound in the unexposed area is polymerized.

In any case, by pressing the photosensitive material on which a polymerized polymer image has been obtained on the photosensitive material and image-receiving paper in a stacked state,
The contents of the unpolymerized capsules (polymerizable compound, coloring material, etc.) can be transferred to image-receiving paper to obtain a color image on the image-receiving paper.

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, pressure may be applied while conveying using a pressure roller such as a nip roll, or the 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.

Example 1 Add 20 g of gelatin and 0.8 g of sodium chloride to an aqueous ER gelatin solution (1,600 ml of water, and adjust to pH 3.5 with IN sulfuric acid.
(adjusted to 45°C), potassium bromide 6
200 - of an aqueous solution containing 5 g and an aqueous solution of silver nitrate (20
0- and 100g of nitric acid dissolved) at the same time.
Added at equal flow rate over 0 minutes. 5 minutes after this addition was completed, a sensitizing dye (SR-1) was added, and 15 minutes after addition of the sensitizing dye, potassium iodide 2. An aqueous solution containing 100 g of OOg and an aqueous silver nitrate solution (0.022 g of silver nitrate dissolved in 100 g of water) were added at equal flow rates over 5 minutes. Add 1.2 g of poly(isobutylene-monosodium co-maleate) to this emulsion,
After sedimentation, washing with water, and desalting, 3.5 g of gelatin was added and dissolved, and 0.45 μg of sodium thiosulfate was added for chemical sensitization at 55°C for 20 minutes, resulting in an average particle size variation of 0.138 m. 440 g of a monodispersed tetradecahedral silver iodobromide emulsion (ER, -1) with a coefficient of 24% was prepared.

Sensitizing dye (SR) Add 16 g of gelatin and 0.5 g of sodium chloride to an aqueous solution of gelatin (1,500 ml of water, and adjust the pH to this with IN sulfuric acid.
3.2 and kept warm at 50°C), add 300 ml of an aqueous solution containing potassium bromide Ig [300 ml of silver aqueous solution C water]
00m and 1w & 100g of nitrate were added at the same time at the same flow rate over 50 minutes. One minute after this addition was completed, 430 μg of aggravating dye (SB-1)
15 minutes after the addition, potassium iodide 2°9
100ml of an aqueous solution containing
- and 3 g of nitrate H dissolved therein) was added at an equal flow rate over 5 minutes. To this emulsion, 1.2 g of poly(isobutylene-monosodium co-maleate) was added and precipitated, washed with water and desalted, 4 g of gelatin was added and dissolved, and 0.5 μm of sodium thiosulfate was added. Then, chemical sensitization was carried out at 50 DEG C. for 15 minutes to prepare 460 g of a monodisperse dodecahedral silver iodobromide emulsion (EB-1) having an average grain size of 0.degree. 22 .mu.m and a coefficient of variation of 20%.

Heron' (EG- gelatin aqueous solution (add 20 g of gelatin and 0.5 g of sodium chloride to 1,600 ml of water, and add this to IN sulfuric acid)
200ml of an aqueous solution containing 71g of potassium bromide and a silver nitrate aqueous solution (100g of silver nitrate dissolved in 200+d of water) were simultaneously added at equal flow rates over a period of 30 minutes. did. One minute after this addition was completed, 480 μl of sensitizing dye (SG-1) was added, and 10 minutes after the addition of the sensitizing dye, 22 μg of potassium iodide was added.
100ml of an aqueous solution containing 9g of silver nitrate and an aqueous solution of silver nitrate (water
00- in which 13 g of nitric acid was dissolved) was simultaneously added over a period of 5 minutes. To this emulsion, 1.2 g of poly(imbutylene-monosodium co-maleate) was added, sedimented, washed with water and desalted, 4.5 g of gelatin was added and dissolved, and an additional 0.7 g of sodium sulfate was added. In addition,
Chemical sensitization was performed at 60°C for 15 minutes, and the average particle size was 0.
．． 460 g of a monodispersed tetradecahedral silver iodobromide emulsion (EG-1) having a 128 m coefficient of variation of 21% was prepared.

Sensitizing Dye (SB-1) Sensitizing Dye (SG-1) (3% aqueous solution of gelatin in a 300M dispersion container of KB-1)
60 g, 40 g of base precursor (Specific Example 4) and 200 glass beads with a diameter of 0.5 to 0.75 were added;
Dispersion was performed for 30 minutes at 3,000 revolutions per minute using a Dyno Mill, and the particle size was 1. A solid dispersion (KB-1) with a diameter of 0 μm or less was obtained.

To 170 g of the polymerizable compound (MN-2) of (GC-1), Tsurusperse 5
000 (trade name, manufactured by ICI) 3.0g was dissolved,
30 g of copper phthalocyanine (manufactured by Tokyo Kasei Corporation) was mixed and stirred for 1 hour at 5000 revolutions per minute using an Eiger motor mill (manufactured by Eiger Engineering Co., Ltd.) to obtain a dispersion (GC-1).

(255 g of GY-1 polymerizable compound (MN-2) was mixed with 45 g of Microlith Yellow 4GA (trade name, manufactured by Ciba Geigy), heated and stirred at 80°C for 90 minutes, and the dispersion (GY-
1) was obtained.

255 g of GM-polymerizable compound (MS-2) was mixed with 45 g of Microrethread 3RA (trade name, manufactured by Chiha Geigy), heated at 80°C for 90 minutes, and stirred to form a dispersion (GM-2).
1) was obtained.

Copolymer (I P
9 g of a 20% by weight solution of (SV-1) in -1) was dissolved. In this solution, 2.3 g of (RD-1) and (RD-2>6.
2 g and 1.0 g of a methanol solution of the following mercapto compound (FF-3) were added to obtain an oily liquid.

To this solution, 3°8 g of silver halide hole #J (ER-1) and 24 g of solid dispersion (KB-1) were added, and while keeping the temperature at 50°C, the mixture was stirred for 5 minutes at 15,000 rpm using a homogenizer. , W10 emulsion photosensitive composition (P
R-1) was obtained.

Copolymer (IP-1) C.B.

C.L. (CL-C+ms iCH, -Ch COgCHiCl(=CH□ CO□H (SV CH2-CH-CHtOCH.

H (RD-1) (RD-2) (FF-3) Add 26 g of distilled water to 4.0 g of a 15% aqueous solution of the polymer (2P-1) of the microcapsule (CR-1) and the polymer (2P-2). A mixed solution containing 70 g of a 10% aqueous solution was adjusted to pH 5.0. The above photosensitive composition (PR-1,) was added to this mixed solution, and stirred at 50°C for 20 minutes at 5000 rpm using Daysilver.
An emulsion in the form of a 10/W emulsion was obtained.

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.

7.5g of distilled water to 146g of the above W10/W emulsion
37.5 g of this aqueous solution of the melamine formaldehyde initial condensate was added, and the pH was adjusted to 5.0 using 2Ng acid while keeping the temperature at 25°C.Then, the temperature was raised to 60°C over 30 minutes. Then, heating and stirring at 60° C. was continued for an additional 30 minutes. Then add 10.3g of a 40% aqueous solution of urea, and add 2N! Adjust the pH to 3.5 using #1, continue heating and stirring at 60°C for 40 minutes, cool to room temperature, and
The pH was adjusted to 6.5 using N sodium hydroxide, and a photosensitive microcapsule dispersion (CR-1) using melamine formaldehyde resin as the capsule wall material was prepared.

Polymer (2P-1> Polymer (2P~2) I CH1-CH+ Polyvinylpyrrolidone -90 CGAF) (PB-1> Pigment dispersion (GY-1) 45g copolymer (I P-
1) 9 g of 20% (wt%) solution of (SV-1), (R
D-1) 2.3g, (RD-2) 6.2g, (FF-3
) and 5.0 g of polyethylene glycol (molecular weight 2000) were added and dissolved to prepare an oily solution.

Add silver halide emulsion (EG-1+3°8g) to this solution,
24 g of solid dispersion (KB-1) was added, and stirred for 5 minutes at 15,000 revolutions per minute using a homogenizer while keeping the temperature at 60°C.
B-1) was obtained.

Copolymer (IP-1) was added to 45 g of pigment dispersion (GM-1) of (PG-1).
) (7) (SV-1) 9 g of 20% (wt%) solution, (
RD-1) 2.3g, (RD-2) 3.1g, (FF-
3) 0.5% methanol solution 1. Og and 5.0 g of polyethylene glycol (molecular weight 2000) were added and dissolved to prepare an oily solution.

Add 3.8 g of silver halide emulsion (EG-1) to this solution,
24 g of solid dispersion (KB-1) was added, and stirred for 5 minutes at 15,000 revolutions per minute using a homogenizer while keeping the temperature at 60°C.
G-1) was obtained.

Photosensitive composition (PB-1) (PG-1) (PR-1)
Exactly the same as (CR-1) except that it is used instead of
Photosensitive microcapsule dispersion (CB-1), (CG-
1) was prepared.

N-2 CHzCOxCHzCFI-CaHw NaON-2CHzCOxCHzCFI-CaH*Hs The above photosensitive microcapsule dispersion (CR1) (CB
-1) and (CG-1) were mixed, 08 g of 1% aqueous solution on the surfactant side (WW-2), and Surflon 5ill.
(Product name, manufactured by Asahi Glass ■) 3% aqueous solution 0.1g, PV
0.4 g of a 20% aqueous solution of A205 (manufactured by Kuraray ■) and 0.6 g of distilled water were added, and the mixture was stirred at 40° C. for 30 minutes.

This solution was mixed with polyvinylpyrrolidone-co-vinyl acetate for 3
The photosensitive material of the present invention was prepared by coating on a 25 μm thick polyethylene terephthalate film at a coating amount of 10 yd/rd and drying at 60° C.

80g of Fukiho standing calcium carbonate (PC700, manufactured by Shiraishi Kogyo),
Mix 1.6 g of surfactant (BOYS 520, manufactured by Kao) and 221.4 g of water, and polytron dispersion fli (
2 per minute using PTI O/35 type, manufactured by Kibumacika)
Dispersion was carried out at 000 rpm for 20 minutes. 52 g of this dispersion,
52 g of 10% polyvinyl alcohol (PVA-1,17, manufactured by Kuraray), the surfactant used in Example 4 (
Mix 4 g of 10% water-soluble e of WW-1), and then add 2 g of water.
2 g was added to prepare a coating solution for forming an image-receiving layer.

This coating solution was applied to a paper support (JI
24 as the fiber length distribution defined by SP-8207
A paper support using a base paper having a fiber length distribution such that the sum of the weight percent of the menonyu residue and the weight percent of the 42 mesh residue is 30 to 60% (see JP-A-63-186239). After uniformly coating the film at a ratio of 50°/cm, it was dried at 60°C to prepare an image-receiving material.

Using a tungsten light bulb as a photosensitive material, C (cyan)/M
(magenta) and Y (yellow) color correction filters were controlled and exposed, placed on a hot plate heated to 140°C, and the photosensitive layer surface was brought into close contact with the photosensitive layer for 10 minutes.
Layer the sample obtained by heat development for a second on receiver paper,
In this state, the visual density of the reflection of the image obtained through a pressure roller of 1000 kg/c++1 was set to 140.

(Image sample H2) Exposure was performed under the same filter conditions as H2, at 135°C and 14°C.
Image samples that were heat-developed at 5° C. and transferred to image-receiving paper under the same conditions are designated as H1 and H3.

Next, the samples exposed under the same filter conditions as above were subjected to the combination treatments shown in the table below.

The treated samples were subjected to visual density measurements similar to H2. The results are shown in Table 1.

/ / / / / / The concentration change in Tables H1 to H3 is 0.75. For HIA-3A, which was preheated, the value was 0.71, showing almost no improvement effect. However, for HIB~3B, the concentration change is 0
．． 61 and the effect appears, and at HIC ~ 3C, 0
．． 27 and has been significantly improved. The same effect is obtained with HID to 3D.

On the other hand, in HIE to 3E, even if the heat development time is shortened, the density change is 0.30, which is a great advantage in terms of speed.

In this way, by performing preheating at 5° C. or higher, it is stable against temperature fluctuations and the total development processing time can be shortened.

Patent Applicant: Fuji Photo Film Co., Ltd. Procedural Amendment (hesitation) Heisei 2 years Month / Day

Claims (3)

[Claims] (1) At least silver halide, reducing agent,
After image exposure, a photosensitive material having a photosensitive layer containing microcapsules containing a color image-forming substance, a polymerizable compound, and a base precursor is subjected to a heat development step, and a step of overlapping the photosensitive material with image-receiving paper in this state. In the image forming process including the step of applying pressure and the step of peeling off the photosensitive material and the image receiving paper, at least one preheating development step at a temperature of at least 5° C. or higher than the heat development step is provided before the heat development step. image forming method. (2) The image forming method described above, wherein the thermal decomposition temperature of the base precursor used in the photosensitive material is 90° C. or higher. (3) At least silver halide, reducing agent,
After image exposure, a photosensitive material having a photosensitive layer containing microcapsules containing a color image-forming substance, a polymerizable compound, and a base precursor is subjected to a heat development step, and a step of overlapping the photosensitive material with image-receiving paper in this state. In an image forming process that includes a pressure transfer step and a step of peeling the photosensitive material and image receiving paper, at least one preheating development step at a temperature of at least 5° C. or higher than the heat development step is provided before the heat development step. Features of the image forming device.