JPS63153539A - Thermally developable photosensitive material containing novel retarder and having superior shelf stability - Google Patents

Abstract

PURPOSE:To obtain a high density image free from fog by incorporating at least two kinds of specified compds. CONSTITUTION:At least one kind of compd. represented by formula I and at least one kind of compd. represented by formula II are incorporated. In the formula, X1 is a residue of a photographic retarder, L1 is a simple bonding radical or a bivalent group and A is H atom, amino group or a salt thereof, sulfo group or a salt thereof. In the formula II, X2 is a residue of a photographic retarder, L2 is a bivalent group and B is a ballast group. Thus, a high density image free from fog can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat-developable photosensitive material on which an image is formed by heat development. The present invention relates to a heat-developable photosensitive material.

[Background of the Invention] Regarding heat-developable photosensitive materials in which the developing step can be carried out by heat treatment, for example, Japanese Patent Publication No. 43-4921 and No. 43-49 disclose
No. 24 discloses a photosensitive material comprising an organic silver salt, silver halide, and a reducing agent.

Attempts have been made to improve such heat-developable photosensitive materials and obtain color images by various methods.

For example, U.S. Pat. No. 3,531,286;
761.

No. 270 and No. 3,764,328 each disclose a heat-developable color photosensitive material in which a color image is formed by a reaction between an oxidized product of an aromatic primary amine developing agent and a coupler.

Further, Research Disclosure No. 15108 and No. 15127 disclose a heat-developable color photosensitive material in which a color image is formed by a reaction between an oxidized product of a sulfonamide phenol or sulfonamide aniline derivative developing agent and a coupler. However, in these methods, a reduced silver image and a color image are simultaneously generated in the exposed area after thermal development, resulting in a problem that the color image becomes cloudy. To solve this problem, there is a method of removing the silver image by liquid processing or transferring only the dye to another layer, such as an image receiving sheet having an image receiving layer, but it is necessary to distinguish between unreacted materials and the dye. The problem is that it is not easy to transfer only the dye.

In addition, in Research Disclosure No. 16966, an organic imino silver salt having a dye part is used, the imino group is released in the exposed part by heat development, and a color image is formed on the image-receiving layer as a transfer paper using a solvent. A developable color photosensitive material is disclosed. However, this method has the problem that it is difficult to suppress the release of dyes in areas not exposed to light, and it is not possible to obtain clear color images.

Also, JP-A-52-105821, JP-A No. 52-1058
No. 22, No. 56-50328, U.S. Patent No. 4,
No. 235,957, Research Disclosure No. 14448, Research Disclosure No. 15227, Research Disclosure No. 18137, etc. disclose heat-developable color photosensitive materials in which a positive color image is formed by a heat-sensitive silver dye bleaching method. However, this method requires extra steps and photographic construction materials, such as stacking and heating sheets containing activators to speed up the bleaching of the dyes, and the resulting color images do not survive long-term storage. Another problem is that it is gradually reduced and bleached by coexisting free silver and the like.

Also, U.S. Patent Nos. 3,180,732 and 3,98
No. 5,565 and No. 4,022,617, and Research Disk Roller 1 Fu 12533.
No. 6, No. 2003, discloses a heat-developable color photosensitive material that utilizes a leuco dye to form a color image. However, this method has the problem that it is difficult to stably incorporate the leuco dye into the photographic material, and the material gradually becomes colored during storage.

Furthermore, JP-A-57-179840, JP-A No. 57-186
No. 744, No. 123533, No. 59-12431,
No. 59-124339, No. 59-. No. 166954,
No. 5-9-159159, No. 59-181395
No. 59-229556 and other publications disclose heat-developable coupler photosensitive materials that release or form diffusible dyes by heat development to obtain transferred color images.

However, these prior art techniques have a maximum concentration (Dm
There is a disadvantage that fog ([)min) increases as ax) increases, and when inhibitors used in ordinary conventional photographic materials are used to suppress fog, they do not show a suppressing effect. However, there are drawbacks such as increasing fog or decreasing D max and sensitivity at the same time, and there is a strong desire to develop an inhibitor that can be used in photothermographic materials.

Furthermore, as described in Japanese Patent Application No. 60-263.564, the present inventor has developed a heat-developable photosensitive material containing an inhibitor having a ballast group, which improves fogging during heat development and improves storage stability. Although it was found that the properties could also be improved, the degree of improvement was not sufficient. It has also been found that when a color-sensitized silver halide emulsion is used, fog increases and sensitivity decreases when the photothermographic material is stored under high temperature and high humidity conditions.

In contrast, the inventors of the present invention
As described in the specification of the present invention, fog caused by heat development is improved by using a photothermographic material containing an inhibitor having a hydroxyl group, a carboxyl group, a sulfonic acid group, or a sulfinic acid group or a salt thereof. Look at that f(
However, it has been found that the photothermographic material has a drawback in that fog increases when the photothermographic material is stored under high temperature and high humidity conditions.

[Object of the Invention] An object of the present invention is to solve the problems of the above-mentioned photothermographic materials.

That is, an object of the present invention is to provide a photothermographic material containing a novel inhibitor.

Another object of the present invention is to provide a heat-developable photosensitive material that can produce images with high density and no fog.

Another object of the present invention is to provide a photothermographic material having improved storage stability.

[Structure of the Invention] The object of the present invention is to provide a heat-developable photosensitive material having a layer containing photosensitive silver halide on a support, at least one compound selected from the following general formula (1).
This was achieved using a heat-developable photosensitive material containing at least one species selected from the following compounds and compounds represented by the following general formula (2).

General formula (1) %Formula% [In the formula, x1 represents a residue of a photographic inhibitor, Ll represents a simple bond or a divalent group, A is a hydrogen atom,
It represents an amine group, a hydroxyl group, a carboxyl group or a salt thereof, a sulfo group or a salt thereof, or a sulfinic acid group or a salt thereof. General formula (2) % formula % [In the formula, ×2 represents the residue of a photographic inhibitor, L2 is 2
represents a valence group, and B represents a ballast group. ] [Specific Structure of the Invention The heat-developable photosensitive material of the present invention consists of a heat-developable photosensitive element and an image-receiving element. It is called a member.

The inhibitor represented by general formula (1) will be specifically explained.

In the general formula (1), the residue of the photographic inhibitor represented by
Akira Sasai, Photo Kogyo Publishing Co., Ltd.) pp. 168-169, or The Theory of Fu 11 - Graphic Pro-Wrestling (edited by Ding, H., James, Matsuku Millan Co., Ltd.) 3
It is a residue of a compound known as an inhibitor (or antifoggant) in conventional silver halide photographic materials as described in 96'', page 399, and is preferably heated at 25°C. It is a residue of an organic compound whose solubility product (pKsp) of the silver salt of the compound in water is 10 or more.

A preferred example in which the x1 residue in the general formula (1) is a compound represented by XT1-1 is shown in the following general formula (3) (118).

7M [RI and R2 are each a hydrogen atom, the number of carbon atoms is 1 to 7
M represents a hydrogen atom, an alkali metal atom, an ammonium group, or an organic amine'
Does not represent yM group. ](<> 〒M N=N [RI represents a hydrogen atom, an alkyl group or an aryl group having 1 to 7 fl'!if carbon atoms, and M represents the general formula (3)
It is synonymous with M. ] [R' is a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, or an aryl group having 1 to 7 carbon atoms (Ilil).
, R2 and R3 each represent a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, an aryl group having 1 to 7 carbon atoms, or a 21 to 2 group, and when R2 and R3 are bonded, 5
or Lt may form a 6-membered ring. ] [R'' represents a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, or an aryl group, and R2 and R3 each represent a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, or an alkyl group having 1 to 7 carbon atoms. It represents 1 to 7 aryl groups, and R2 and R3 may be combined to form a 5- or 6-membered ring.J [Y represents -N-1-〇- or -S-, R1 represents a hydrogen atom, an alkyl group or an aryl group having 1 to 7 carbon atoms, and M has the same meaning as M in general formula (3).] where R1 is a thiol group or -N+-1-R4 (R
4 is a hydrogen atom, and the number of carbon atoms is 1 to 71jl! , an alkyl group or an aryl group), R2 and R3 each represent a hydrogen atom, an alkyl group having 1 to 71 carbon atoms, an aryl group having 1 to 7 carbon atoms, or a nidoO group,
R2 and R3 may be combined to form a 5- or 6-membered ring. ] p+ [RI and R2 represent a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, an aryl group having 1 to 7 carbon atoms, or a halogen atom, and R1 and R2 are bonded to form a 5- or 6-membered It may form a ring of members. [RI, R2 and R3 are each a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, an amine group, an alkoxy group having 1 to 7 carbon atoms, or a thioalkoxy group having 1 to 7 carbon atoms. group, or -SM (M has the same meaning as M in general formula (3)). ]R' [R1, R2, R3, R4 and R5 are each a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, and 1 to 7 carbon atoms
aryl group, -N H-R6 (R6 is a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, or an alkyl group having 1 to 7 carbon atoms)
Represents 7 aryl groups. >, -3M (M is the general formula (
It is synonymous with M in 3). , ) represents an alkylthio group having 1 to 7 carbon atoms or an alkoxy group having 1 to 7 carbon atoms. ] F(″ [R1, R2, R3 and R4 are each R of general formula (11)
To 1/Synonymous with R5. ] [RI and R2 each represent a hydrogen atom or an alkyl group having 1 to 7 carbon atoms,
M has the same meaning as M in general formula (3). ] R' -NHCNH-R2 [R' and R2 each have a hydrogen atom and a carbon atom number of 1 to 7
represents an alkyl group or an aryl group, and R1 and R2 may be combined to form a 5- or 6-membered ring. ] RI R co[R', R2, and R3 each represent a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, or an aryl group, and R
1 and R2 may be combined to form a 5- or 6-membered ring.

Y represents 10-1-8- or -N- (R4 represents a hydrogen atom or an alkyl group having 1 to 7 carbon atoms). [R' represents a hydrogen atom, an amine group, an alkyl group having 1 to 7 carbon atoms, or an aryl group, and Y is 10-1-8
- or -N- (R3 represents a hydrogen atom, an amine group, or an alkyl group having 1 to 7 carbon atoms). M has the same meaning as M in general formula (3). ] [RI and R2 each have a hydrogen atom and a carbon atom number of 1 to 7
represents an acyl group, alkyl group or aryl group, R
1 and R2 may be combined to form a 5- or 6-membered ring.

Y is =N- or -C- (R3 represents a hydrogen atom or an alkyl group having 1 to 7 carbon atoms.) M is represented by the general formula (
It is synonymous with M in 3). ] former R [R', R2 and R3 have the same meanings as R1 to R3 in general formula (15), and ye represents a counter anion. ] Nitrogen-containing compounds having a -3M group (M represents a hydrogen atom, an alkali metal atom, an ammonium group, or an organic amine residue) as a favorable photographic inhibitor residue in general formulas (3) to (18) It is a residue of a heterocyclic ring, and has the general formula (4) or (8
) are particularly preferred.

In the general formula (1), Ll represents a divalent group, and Ll is preferably an alkylene group having 1 to 7 carbon atoms (e.g., methylene group, ethylene group, propylene group, etc.),
Alkenylene M (e.g. vinylene group, propenylene group, etc.), arylene group (e.g. p-phenylene group, m-)]
nylene group, o-phenylene group, etc.), imino group, carbonyl group, sulfonyl group, ether group, or a group combining these (for example, alkylene carbonylamino group,
(aralkyleneamino group, sulfonyl)nomino group, etc.).

The compound according to the present invention represented by the general formula (1) is more specifically represented by the following general formula (19).

General formula (19) In the formula, L1' and Δ' have the same meanings as L1 and Δ defined in the above general formula (1), and Y represents a nitrogen atom or a carbon atom.

Typical specific examples of the compounds of the present invention represented by the general formula (1) are shown below, and the compounds of the present invention (A-1) (A-2) (A-3) (A-4) N= N (A-5) N=N (A-6) N=N (A-7) (A-8) (A-9) (A-10) (A-11) Gate (A-12) (A -13) (A-14) (A-15) (A-76) (A-'17) (A-18> (A-79) (A-20) (A-, 27) (A-22> (A-23] (A-24) (A-29) (A-26) (A-27] (A-287 (A-30) H2N-C-NHCH2COOH (A-31) (A-32) ( A-34) (A-3r)) (A-37) (A-3'1l) (A-37) C,H.

(A-40) (A-47) (A-42) (A-43) (A-44) (A-Kiri) (A-Science) (A-4'7) N=N (A-41) (A-+9) (A-daO) (A-51) (A-Jz) ■ (A-53) (A-r4) (A-55) (A-diot) (A-dawa) (A -5-1) 1 (A-rq) The compound represented by the general formula (1) can be synthesized by a conventional method. For example, Kemissi-Berichte [
Chemische 3erichte J 35
.

pp314 (1953), Canadian Journal off 'YMI'), Tory Canadian
Journal of Chemistry J 37,
I)+1101 (1959), Journal of Chemical Society “Journa
l or Chemical 5ociety J Sat., 1) 11174g (1927), and British Patent No. 1,275,701, U.S. Patent No. 3.266, 89
No. 7, JP-A No. 50-89034, JP-A No. 53-28426
No. 55-21067, No. 56-111846, and the like.

The amount of the compound represented by the general formula (1) of the present invention is:
This is not limited to the type of the compound, whether it is used alone or in combination of two or more, the type, amount, and mixing ratio of the photosensitive silver halide and organic silver salt used, or the layer in which the photosensitive material of the present invention is applied. Although it may be determined depending on whether the composition is composed of
Preferably 0-7 to 10-1 mol, more preferably 10
-5 to 10-2 moles.

The compound represented by the general formula (1) of the present invention may be added to any of the constituent layers of the photothermographic material, or may be added to two or more layers. As a constituent layer, it is generally added to a photosensitive layer containing photosensitive silver halide or a layer containing an organic silver salt, but it may be added to a non-photosensitive layer. When adding photosensitive silver halide to a layer containing photosensitive silver halide, the timing of addition is after the precipitation of the photosensitive silver halide grains used in the photosensitive layer is formed after physical ripening. It may be applied at any time up to the time when the emulsion containing the emulsion is coated.

Further, as the addition method, any method normally used for adding compounds can be applied. For example, the compound of the present invention can be added in the form of an acid or salt by dissolving it in water, an organic solvent such as methanol, or a mixed solvent thereof. can. Alternatively, if it can be dissolved in an organic solvent such as ethyl acetate or cyclohexane, it can be added as an emulsion.

Next, the inhibitor represented by general formula (2) will be specifically explained.

The residue of the photographic inhibitor represented by X2 of the compound represented by the general formula (2) of the present invention is x1 of the general formula (1).
The same ones can be mentioned, but general formula (4) or (8)
Particularly preferred are photographic suppressor residues represented by:

In the general formula (2), the divalent group represented by L2 includes the same groups as Ll in the general formula (1), and more specifically, the following groups are mentioned.

-CONH-1-3O2NH-1-NHCONH-1-
NHC○-1-NH3O2-1-o-1-S-1-N-
(R is a hydrogen atom or an alkyl group) and -CO-0 As the ballast group represented by B in the general formula (2) of the present invention, the compound represented by the general formula (2) of the present invention and It is an organic ballast group that has a molecular size and shape that reduces the diffusivity of the silver salt (or silver complex) or makes it resistant to diffusion.A general organic ballast group is fused directly or indirectly to a long-chain alkyl group bonded to the inhibitor residue directly or via a divalent bonding group represented by L2, or to the carbocyclic nucleus or heterocyclic nucleus of the inhibitor residue. This includes benzene-based and naphthalene-based aromatic groups. Effective ballast groups generally have at least 8 carbon atoms, more preferably 8 to 40 carbon atoms (including substituent carbon atoms, if any). (including those having substituents).

In addition, groups having a group substituted with a hydrophilic group such as a sulfo group or a carboxy group, and having an alkyl group having 8 to 30 carbon atoms (including those having substituents) are also effective. It is a ballast group.

Preferred specific examples of the ballast group are shown below.

C+tHzs + C+sHz+ +
C+. H211CH2CHC, H-, (CH2) s
○(CH,)7CH3.

(2) 2Hs Representative specific examples of the compound of the present invention represented by the general formula (2) are shown below, but the compound of the present invention is not limited thereto.

(B-1) (B-2)
(B-3) ○ (B-4) (B-5) (B-6) (B-7) (B-8) (B-9) (B-10) (B-11) (B-13 ) (B-14) NtiC
○C,,H,.

(B-15) CB-16) (B-17) (B-18) (B-19) (B-20) (B-21) (B-22) (B-23) (B-24) ( B-25) (B-26) (B-27) Hundred (B-28) (B-29) (B-30) (B-31) (
B-32) o3H (B~33) H (B-35) C)1. C0OH A specific synthesis example of the compound of the present invention is shown below.

Synthesis Example-1 Synthesis of Compound (B-1>) 19.3 g of -(p-aminophenyl)-1,2,3,4-tetrazole-5-thiol and 2On of pyridine were added to acetonitrile 200mm, and stirred at room temperature. While doing so, 33 (l) of valmitoyl chloride was added dropwise. After dropping, 1
After heating under reflux for an hour, the mixture was cooled to precipitate crystals. The crystals were collected by filtration, washed with cold acetonitrile, and dried.
5 g (76%) of target product 31 was obtained.

Synthesis Example 2 Synthesis of Compound <8-15> 6-Amino-2-mercaptobenzothiazole 18.2
g and 201 g of pyridine were added to 2001 g of acetonitrile, and while stirring at room temperature, 3-(2,4-di(t)
A solution of 35 g of (pentylphenoxy)-butyric acid chloride in acetonitrile (50 d) was added dropwise. After completion of the dropwise addition, the mixture was heated under reflux for 1 hour. The reaction solution was drained of water, and the crystals were separated by filtration.
This crystal was recrystallized from acetonitrile to obtain the desired product 33.
．． 8 g (yield 88%) was obtained.

Other compounds of the present invention can be synthesized in a similar manner.

The amount of the compound represented by general formula (2) of the present invention is:
There are no limitations on the type of the compound, whether it is used alone or in combination of two or more, the type, amount, and mixing ratio of the photosensitive silver halide and organic silver salt used, or from which layer the photosensitive material of the present invention is formed. It may be determined depending on the composition, etc., but approximately 10-5 per mole of photosensitive silver halide
~10-1 mol is preferable, more preferably 10-4~
It is 10-2 mol.

The compound represented by the general formula (2) of the present invention may be added to any of the constituent layers of the heat-developable photosensitive material, or may be added to two or more layers, but it may contain photosensitive silver halide. It is preferable to add the compound of the present invention to the photosensitive layer. It may be added at any time before the emulsion is coated, and any method can be applied. For example, low boiling point solvents (methanol, ethanol, ethyl acetate, etc.) or high boiling point solvents (dibutyl phthalate, etc.) dioctyl phthalate, tricresyl phosphate, etc.), and then subjected to ultrasonic dispersion or dissolved in an alkaline aqueous solution (e.g., 10% aqueous sodium hydroxide solution, etc.), and then treated with a mineral acid (e.g., hydrochloric acid or nitric acid, etc.). It can be used after being neutralized, or after being dispersed in a ball mill with an aqueous solution of an appropriate polymer (eg, polyvinyl butyral, polyvinylpyrrolidone, etc.).

The heat-developable photosensitive material of the present invention basically contains (1) photosensitive silver halide, (2) reducing agent, (3) dye-providing substance, and (4) binder in one heat-developable photosensitive layer. It is preferable to contain (5) an organic silver salt as necessary. However, these do not necessarily need to be contained in a single photographic constituent layer; for example, the heat-developable photosensitive layer is divided into two layers, and the components (1), (2), (4), and (5) are Two or more compositions can be used as long as they are in a state where they can react with each other, such as containing the dye-providing substance (3) in the heat-developable photosensitive layer on one side and the dye-providing substance (3) in the layer on the use side adjacent to this photosensitive layer. It may be contained in separate layers.

Further, the heat-developable photosensitive layer may be divided into two or more layers, such as a high-sensitivity layer and a low-sensitivity layer, a high-density layer and a low-density layer, or the like.

The heat-developable photosensitive material of the present invention has one or more heat-developable photosensitive layers on a support. In the case of color, it generally has three heat-developable photosensitive layers with different color sensitivities, and in the core photosensitive layer, dyes with different hues are formed or released by heat development.

Typically, a yellow dye is used in the blue-sensitive layer, a magenta dye is used in the green-sensitive layer, and a cyan dye is used in the red-sensitive layer, but the invention is not limited to this. It is also possible to combine a near-infrared sensitive layer.

The structure of each layer can be arbitrarily selected depending on the purpose. For example, a structure in which a red-sensitive layer, a green-sensitive layer, and a blue-sensitive layer are sequentially formed on the support, or a structure in which a blue-sensitive layer is sequentially formed on the support. layer, a green-sensitive layer, a red-sensitive layer, or sequentially on a support,
There are configurations such as a green photosensitive layer, a red photosensitive layer, and a blue photosensitive layer.

In addition to the heat-developable photosensitive layer, the heat-developable photosensitive material of the present invention can be provided with non-photosensitive layers such as an undercoat layer, an intermediate layer, a protective layer, a filter layer, a backing layer, and a release layer. To coat the heat-developable photosensitive layer and these non-photosensitive layers on the support, a method similar to that used for coating and preparing general silver halide photosensitive materials can be applied.

Namely, dip method, roller method, reverse roll method, air knife method, doctor blade method, spray method,
There are methods and devices for the bead method, extrusion method, stretch flow method, curtain method, etc.

The heat-developable photosensitive material of the present invention contains photosensitive silver halide. Examples of the photosensitive silver halide used in the present invention include silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodobromide, silver iodobromide, silver chloroiodobromide, and the like. The photosensitive silver halide can be prepared by any method used in the photographic field, such as the single jet method or the Chondrold double jet method, and can be prepared according to the usual method for preparing silver halide gelatin emulsions. A light-sensitive silver halide emulsion containing light-sensitive silver halide can be optionally used.

The silver halide grains are preferably monodisperse, and may be of the so-called core/shell type, and may be coarse or fine grains, but the preferred grain size is about 0. G
O1 μm to about 1.5 μm, more preferably about 0
．． 01 μm to about 05 μm.

The light-sensitive silver halide emulsion may be chemically sensitized by any method in the photographic art. Such sensitization methods include various methods such as gold sensitization, sulfur sensitization, gold-sulfur sensitization, and reduction sensitization.

The light-sensitive silver halide emulsion of the present invention can be spectrally sensitized by adding various spectral sensitizing dyes.

Typical spectral sensitizing dyes used in the present invention include, for example, cyanine, merocyanine, complex, (trinuclear or tetranuclear) cyanine, holopolar cyanine, styryl, hemicyanine, oxonol, and the like. Among cyanine dyes, those having a basic nucleus such as thiazoline, oxazoline, viroline, pyridine, oxazole, thiazole, selenazole, and imidazole are more preferred. Such nuclei include alkyl groups, alkylene groups,
It may have a hydroxyalkyl group, a sulfoalkyl group, a carboxyalkyl group, an aminoalkyl group or an enamine group capable of forming a fused carbocyclic or heterocyclic ring. Further, it may be symmetrical or asymmetrical, and the methine chain or polymethine chain may have an alkyl group, a phenyl group, an enamine group, or a heterocyclic substituent.

Merocyanine pigments are listed above! In addition to the basic nucleus, it may have an acidic nucleus such as a thiohydantoin nucleus, rhodanine nucleus, oxazolidine nucleus, barbital acid group, thiazolinthione nucleus, malononitrile nucleus, or pyrazolone nucleus. These acidic nuclei may be further substituted with an alkyl group, an alkylene group, a phenyl group, a carboxyalkyl group, a sulfoalkyl group, a hydroxyalkyl group, an alkoxyalkyl group, an alkylamine group or a heterocyclic nucleus.

If necessary, these dyes may be used in combination. Furthermore, ascorbic acid derivatives, azaindene cadmium salts, organic sulfonic acids, etc., such as U.S. Pat. No. 2,933,
A supersensitizing additive that does not absorb visible light, such as those described in the specifications of No. 390 and No. 2,937,089, can be used in combination.

The amount of these dyes added is 1.times.10' to 1 mole per mole of silver halide or silver halide-forming component.

More preferably, the amount is 1×10 −4 mol to 1×10” mol.

These photosensitive silver halides and photosensitive silver salt forming components can be used in combination in various methods, and the amount used is preferably 0.001 (more preferably 0.1 to 50 g/l'%) per layer. ~10 g/l'.

Further, in the present invention, various organic silver salts can be used for the purpose of increasing sensitivity and improving developability.

Examples of organic silver salts used with the heat-developable photosensitive material of the present invention include Japanese Patent Publication Nos. 43-4921 and 44-26582.
No. 45-18416, No. 45-12700, No. 45-22185, JP-A-49-52626, No. 5
No. 2-31728, No. 52-137321, No. 52-
No. 141222, No. 53-36224 and No. 53-
37610 and U.S. Pat. No. 3,330,
No. 633, No. 3,794,496, No. 4,105
Silver salts of long-chain aliphatic carboxylic acids and silver salts of carboxylic acids having heterocycles, such as silver laurate, silver myristate, silver balmitate, as described in the specifications of , No. 451, etc. Silver stearate, silver arachidonate, silver behenate, silver α-(1-phenyltetrazolethio)acetate, etc., silver aromatic carboxylates, such as silver benzoate, silver phthalate, etc., Japanese Patent Publication No. 44-26582, No. 45 -1270
No. 0, No. 45-18416, No. 45-22185,
JP-A-52-137321, JP-A-58-11863
No. 8, No. 58-118639, U.S. Patent No. 4.123
．． There are silver salts of imino groups described in various publications such as No. 274.

Examples of silver salts of imino groups include benztriazole silver. The penztriazole silver may be substituted or unsubstituted. Representative examples of substituted benztriazole silver include, for example, alkyl-substituted benztriazole silver (preferably an alkyl group of 022 or less,
More preferably those substituted with an alkyl group of C+ or less, such as methylbenztriazole silver, ethylbenztriazole silver, n-octylbenztriazole silver, etc.), alkylamidobenztriazole silver (preferably substituted with an alkylamide group of 022 or less) silver acetamidobenztriazole, silver propionamidebenztriazole, silver 1so-butylamidebenztriazole, silver laurylamidebenztriazole, etc.), silver alkylsulfamoylbenztriazole (preferably alkylsulfamoyl of 022 or less) those substituted with groups, such as silver 4-(N,N-diethylsulfamoyl)penztriazole, silver 4-(N-propylsulfamoyl)penztriazole, silver 4-(N-
octylsulfamoyl)penztriazole silver, 4-
(N-decylsulfamoyl)penztriazole silver,
5-(N-octylsulfamoyl)benztriazole silver, etc.), silver salts of halogen-substituted benztriazoles (
For example, 5-chlorobenztriazole silver, 5-bromobenztriazole silver, etc.), alkoxybenztriazole silver (preferably substituted with an alkoxy group of 022 or less, more preferably an alkoxy group of 04 or less, such as 5-methoxybenztriazole) silver, 5-ethoxybenztriazole silver, etc.), 5-nitrobenztriazole silver, 5-aminobenztriazole silver, 4-hydroxybenztriazole silver, 5-carboxybenztriazole silver, 4-sulfobenztriazole silver, 5-sulfobenztriazole silver Examples include triazole silver.

Examples of other silver salts having an imino group include imidazole silver, benzimidazole silver, 6-nidropenzimidazole silver, pyrazole silver, urazole silver, 1.2
．． 4-t-lyazole silver, 1H-tetrazole silver, 3-
Silver amino-5-benzylthio-1,2,4-triazole, silver saccharin, silver phthalazinone, silver phthalimide, and other silver salts of mercapto compounds, such as silver 2-mercaptobenzoxazole, silver mercaptooxadiazole, and 2-mercapto. Silver benzothiazole, 2-mercaptobenzimidazole capto-4-phenyl-1,2.4-1-lyazole silver, 4-hydroxy-6-methyl-1,3.

3a,7-thitrazaindene silver and 5-methyl-7-
Examples include silver hydroxy-1.2.3,4.6-pentazaindene.

Other silver complex compounds with a stability constant of 4.5-1 (1.0) as described in JP-A No. 52-31128, as described in U.S. Pat. No. 4,168,980; A silver salt of imidacillinthion or the like is used.

Among the above organic silver salts, imino group silver salts are preferred;
Particularly preferred are silver salts of benzotriazole derivatives, more preferably 5-methylbenzotriazole and its derivatives, sulfobenzotriazole and its derivatives, and N-alkylsulfamoylbenzotriazole and its derivatives.

The organic silver salts used in the present invention may be used alone or in combination of two or more. Further, the silver salt may be prepared in a suitable binder and used as it is without being added to the vehicle, or the isolated silver salt may be dispersed in a binder by an appropriate means and used. Dispersion methods include, but are not limited to, ball mills, sand mills, colloid mills, and video mills.

In addition, the method for preparing organic silver salts is generally to dissolve silver nitrate and raw organic compounds in water or an organic solvent and mix them, but if necessary, a binder may be added or a solution such as sodium hydroxide may be added. It is also effective to add an alkali to promote dissolution of organic compounds, or to use an ammoniacal silver nitrate solution.

The amount of the organic silver salt used is usually 0.00 per mole of photosensitive silver halide. The amount is preferably from 0.01 mol to 500 mol, more preferably from 0.01 to 100 mol. More preferably 0
．． It is 3 to 30 moles.

When the heat-developable photosensitive material of the present invention is a color type, a dye-providing substance is used.

Dye-providing substances that can be used in the present invention will be explained below. The dye-donating substance may be any substance as long as it participates in the reduction reaction of the photosensitive silver halide and/or the organic silver salt used as necessary and can form or release a diffusible dye as a function of the reaction. Depending on their reaction form, negative-acting dye-donors act on a positive function (i.e., form a negative dye image when negative-working silver halide is used) and positive-acting substances act on a negative function. It can be classified as a dye-providing substance (that is, it forms a positive dye image when negative-working silver halide is used). Negative dye-donating substances are further classified as follows.

Releases a diffusible dye when oxidized Release type compound　　　Formation type compound Each dye-providing substance will be further explained.

As the reducing dye releasing compound, for example, general formula (20)
Examples include compounds represented by:

General formula (20) % formula % In the formula, Car is a reducing substrate (so-called carrier) that is oxidized and releases a dye upon reduction of the photosensitive silver halide and/or the organic silver salt used as necessary. , Dy
e is a diffusible dye residue.

Specific examples of the above-mentioned reducing dye-releasing compounds include JP-A-57-179840, JP-A-58-116537, and JP-A No. 58-116537.
No. 9-60434, No. 59-65839, No. 59-7
No. 1046, No. 59-87450, No. 59-8873
No. 0, No. 59-123837, No. 59-165054
No. 59-165055 and the specifications thereof, and examples thereof include the following compounds. (,7”, ;,
P: Exemplary color-donating substance below ■ OC+aHu (nJ OC+eHx- ■ 〇 [Phase] [Phase] NO3 ■ [Phase] Other reducing dye-releasing compounds include, for example, the general formula (21
) are listed.

In the formula, A1 and A2 each represent a hydrogen atom, a hydroxy group, or an amine group, and Dye is Dy represented by the general formula (20).
It is synonymous with e. Specific examples of the above compounds are given in JP-A-59-1
This is shown in Japanese Patent No. 24329.

As a coupled dye-releasing compound, the general formula (λ2
) are listed.

General formula (22) % formula % In the formula, C11t is an organic group (so-called coupler residue) that can react with the oxidized form of the reducing agent to release a diffusible dye, and J is a divalent bonding group. The bond between Cp+ and J is cleaved by the reaction of the reducing agent with the oxidized product.

nl represents 0 or 1, and Dye has the same meaning as defined in the general formula <20). Further, Cp+ is preferably substituted with various ballast groups in order to make the coupled dye-releasing compound non-diffusible, and the ballast group has 8 carbon atoms depending on the form of the photosensitive material used.
or more (more preferably 12 or more) organic groups, or hydrophilic groups such as sulfo groups or carboxy groups, or 8 or more (more preferably 12 or more)
More preferably 12111! ] above) and a hydrophilic group such as a sulfo group or a carboxy group. Another particularly preferred ballast group can include polymer chains.

Specific examples of the compound represented by the above general formula (22) include JP-A-57-186744 and JP-A-57-12259.
No. 6, No. 57-160698, No. 59-174834
No. 57-224883, No. 59-159159, and No. 59-231540, each Mei 111 book, and examples include the following compounds.

Exemplary dye-providing substances [phase] Coupled dye-forming compounds include the general formula (S3
) are listed.

General formula (23) % formula %) In the formula, C112 is an organic group (so-called coupler residue) that can react with the oxidized form of the reducing agent (coupling reaction) to form a diffusible dye, and F represents a divalent bonding group, and B represents a ballast group.

The coupler residue represented by CD2 preferably has a molecular weight of 700 or less for the sake of diffusibility of the dye formed.
More preferably it is 500 or less.

Further, the ballast group is preferably the same as the ballast group defined in general formula (22), and particularly has 8 or more (more preferably 12 or more) carbon atoms and a hydrophilic group such as a sulfo group or a carboxy group. Groups having both are preferred, and polymer chains are even more preferred.

The coupled dye-forming compound having a polymer chain is preferably a polymer having a repeating unit derived from a monomer represented by general formula (24).

General formula (S4) CI12 → F-) - + Y thick - → Z mo → L> In the formula, C11
2, F has the same meaning as defined in the general formula (λ3), Y represents an alkylene group, an arylene group, or an aralkylene group, and! represents O or 1, Z represents a divalent organic group, and s represents an ethylenically unsaturated group or a group having an ethylenically unsaturated group.

Specific examples of the coupled dye-forming compounds represented by general formulas (23) and (24) include JP-A-59-12
No. 4339, No. 59-181345, No. 60-2
No. 950, Japanese Patent Application No. 59-179657, No. 59-18
No. 1604, No. 59-182506, No. 59-182
Exemplary dye-providing substances described in the specifications of No. 507 [Phase] C, 8H3゜Polymer OH3 Hs Weight: 40 Weight: 60% by weight Plvi-5 CHs H x: 603B-Quantity: 40'! Quantity M-6 C⇠H x; 50% by weight y; 50% by weight M-7 CR3 ■ In the above general formulas (22, (23) and (2')), the coupler group defined by CPI or CR2 will be described in more detail. Groups represented by the following general formula are preferred.

General formula (2SJ General formula (λ6) General formula←7) General formula (28) General formula (λ9)
General formula (30) General formula (31)
General formula (32) General formula (33)
In the general formula (34), R7, R8, R9 and R10 are each a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aryl group, an acyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, an alkylsulfonyl group, Arylsulfonyl group, carbamoyl group, sulfamoyl group, acyloxy group, amino group, alkoxy group, aryloxy group, cyano group, alkylsulfonyl group, arylsulfonyl group, ureido group, alkylthio group, arylthio group, carboxy group, sulfo group or hetero Represents a ring residue, which further includes a hydroxyl group, a carboxy group, a sulfo group, an alkoxy group, a Siam L nitro group, an alkyl group, an aryl group, an aryloxy group, an acyloxy group, an acyl group, a sulfamoyl group, a carbamoyl group, an imido group, It may be substituted with a halogen atom or the like.

These substituents are selected depending on the purpose of Cpl and CD2, and as described above, one of the substituents for C1111 is preferably a ballast group, and for C112, one of the substituents is preferably a ballast group, and one of the substituents for C112 is preferably a ballast group, and one of the substituents for C111 is preferably a ballast group, and one of the substituents for C112 is preferably a ballast group. has a molecular weight of 700
Hereinafter, the number of substituents is preferably selected to be 500 or less.

As a positive dye-donating substance, for example, the following general formula (3
There is an oxidative dye-releasing compound represented by (d).

General formula (35) In the formula, Wl represents a collection of atoms necessary to form quinone@ (which may have a substituent on this ring),
R11 represents an alkyl group or a hydrogen atom, and E is -N-
C+R'3+- (in the formula, R12 represents an alkyl group or a hydrogen atom, R13 represents an oxygen atom or -N-) or -8○2-, r represents O or 1, and DVe
has the same meaning as defined in general formula (20). Specific examples of this compound are JP-A-59-166954 and JP-A-59-166954 (
No. 1-154445, etc., and include, for example, the following compounds.

CH5 [Phase] CH3 [Phase] As another positive dye-providing substance, the following general formula (36)
There are compounds that lose their dye-releasing ability when oxidized, such as the compound represented by:

H In the formula, W2 represents a group of atoms necessary to form a benzene ring (which may have a substituent on the ring), and R''
,' r % 'E SD yet; by the general formula (3S
) has the same meaning as defined in Specific examples of this compound are JP-A-59-124327 and JP-A-59-152440.
For example, there are the following compounds.

Exemplary dye-providing substance 0CR8 [Phase] Still another positive dye-providing substance is represented by the following general formula (
Examples include compounds represented by 37).

General formula (37) In the above formula, W2, R'', Dye bar general formula (36
) has the same meaning as defined in ).

Specific examples of this compound are described in JP-A-59-154445, etc., and include the following compounds.

Exemplary Dye Donor Substances The residues of the diffusible dyes represented by Dye in the above general formulas (20), (2,1), (22), (36) and (37) are further detailed. Ru. The residue of the diffusible dye preferably has a molecular weight of 800 or less, more preferably 600 or less, due to the diffusibility of the dye.
Examples include residues of azo dyes, azomethine dyes, anthraquinone dyes, naphthoquinone dyes, styryl dyes, nitro dyes, quinoline dyes, carbonyl dyes, phthalocyanine dyes, and the like. These dye residues may be in a temporary short-waveform form that allows multiple colors during thermal development or transfer. Further, these dye residues are useful for increasing the light resistance of images, and for example, chelatable dye residues described in JP-A-59-48765 and JP-A-59-124337 are also preferred. It is.

These dye-providing substances may be used alone or in combination of two or more. The amount used is not limited, and depends on the type of dye-providing substance, whether it is used alone or in combination, or whether the photographic constituent layer of the light-sensitive material of the present invention is a single layer or a multilayer of two or more types. Although it may be determined accordingly, the amount to be used may be, for example, 0.005 (1 to 50 g) per 1 f, preferably 0.1 g to 1 (M).

The dye-providing substance used in the present invention can be incorporated into the photographic constituent layer of the heat-developable light-sensitive material using any method. Cresyl phosphate, etc.) and then subjected to ultrasonic dispersion, or dissolved in an alkaline aqueous solution (e.g., 10% sodium hydroxide aqueous solution, etc.) and then neutralized with a mineral acid (e.g., hydrochloric acid or nitric acid, etc.). Alternatively, it can be used after being dispersed in a ball mill with an aqueous solution of a suitable polymer (eg, gelatin, polyvinyl butyral, polyvinylpyrrolidone, etc.).

As the reducing agent used in the photothermographic material of the present invention, those commonly used in the field of photothermographic materials can be used.

The dye-providing substance used in the heat-developable photosensitive material of the present invention is, for example, 5g of JP-A-57-186744,
-79247, 58-149046, 58-1
No. 49047, No. 59-124339, No. 59-
181345, No. 60-2950, etc., which releases or forms a diffusible dye by coupling with an oxidized form of a reducing agent, it can be used in the present invention. Examples of reducing agents include those described in U.S. Pat. Nos. 3,531,286 and 3,761.
, No. 270, No. 3.764.328, and RD No. 12146, No. 15108.
, No. 15127 and JP-A-56-2713
p-phenylenediamine type and p-
An amine phenol type developing agent, a phosphoramidophenol type developing agent, a sulfonamide phenol type developing agent, a sulfonamide aniline type developing agent, a hydrazone type color developing agent, etc. can be used. Also, U.S. Patent No. 3.
342.599, 3.719.1192, JP-A-53-135628, and JP-A-57-79035, etc., the color developing agent Breaker ()- and the like can also be advantageously used.

As a particularly preferable reducing agent, JP-A-LTL 56-111
Examples include reducing agents represented by the following general formula (38) described in No. 6133.

General formula (3, etc.) r+'nr In the formula, R1d3 and R2 are hydrogen atoms or have a substituent, and C or J: has 1 to 30 carbon atoms (preferably 1 to 4
> represents an alkyl group, R1, R2, etc. may be ring-closed to form a heterocycle, R3, R''.

R5 and R6 each have a hydrogen atom, a halogen atom, a hydroxy group, an amino group, an alkoxy group, an acylamido group, a sulfonamide group, an alkylsulfonamide group, or a carbon atom number of 1 to 30 (preferably 1 to 30) that may represent a substituent. 4)
represents an alkyl group, and R3 and R1 and R5 and R2 may each be closed to form a heterocycle. M represents an alkali metal atom, an ammonium group, a nitrogen-containing organic base, or a compound containing a quaternary nitrogen atom.

The nitrogen-containing organic base in the general formula (3g) is an organic compound containing a basic nitrogen atom capable of forming a salt with an inorganic salt, and particularly important organic bases include amine compounds. Chain amine compounds include primary amines, secondary amines, tertiary amines, etc., and cyclic amine compounds include lysine, quinoline, piperidine, etc., which are well-known examples of typical heterocyclic organic bases. , imidazole and the like. In addition, hydroxylamine,
Compounds such as hydrazine and amidine are also useful as chain amines. In addition, as the salt of the nitrogen-containing organic base, inorganic acid salts of the organic base (eg, hydrochloride, sulfate, nitrate, etc.) as described above are preferably used.

On the other hand, as the compound containing quaternary nitrogen in the above general formula, a compound having a tetravalent covalent bond is used.Next, preferred specific examples of the reducing agent represented by the above general formula (38) are shown below.

(R-5) (R-7) (R-8) ('J (R-9) (R-10) (R-11) (R-12) 0H” HeNf~-T-T, Qo, NaCHs (R-17) (R, -18) (R, -19) (R-24) (R-20) (R, -21) (R-22) (R-23) (R-28) ( R-25) (R-26) (R-27) (R-29) (R-30) The reducing agent represented by the above general formula (38) can be prepared by a known method such as Heuben Peil, Mesoden Der. Organizien Hemi, Band XI/2 (Hoube
n-Weyl, Methoden de
rQrganischen Chen+ie, B
and XI/2), pages 645-703.

Furthermore, it is also possible to use two or more of the above-mentioned reducing agents at the same time, or to use a black and white developing agent described below in combination for the purpose of increasing developability.

Further, the dye-donating substance used in the present invention is JP-A No. 57-179840, No. 58-58543, No. 5
In the case of compounds that release dyes upon oxidation, compounds that lose their ability to release dyes when oxidized, compounds that release dyes when reduced, etc. as shown in Nos. 9-152440 and 59-154445, etc. Alternatively, in the case where only a silver image is simply obtained, a developing agent as described below can also be used.

For example, phenols (e.g. p-phenylphenol, p-methoxyphenol, 2,6-tert-
butyl-p-cresol, N-methyl-p-aminephenol, etc.), sulfonamidophenols [e.g. 4-
Benzenesulfonamidophenol, 2-benzenesulfonamidophenol, 2,6-dichloro-4-benzenesulfonamidophenol, 2,6-dipromo 4-
(p-toluenesulfonamide)phenol, etc.], or polyhydroxybenzenes (e.g., hydroquinone,
tert-butylhydroquinone, 2,6-dimethylhydroquinone, chlorohydroquinone, carboxyhydroquinone, catechol, 3-carboxycatechol, etc.), naphthols (e.g. α-naphthol, β-naphthol, 4-aminonaphthol, 4-methoxynaphthol, etc.) ), hydroxybinaphthyls and methylene bisnaphthols [e.g. 1,1'-dihydroxy-2,2'
-binaphthyl, 6,6'-dibromo-2,2'-dihydroxy-1,1'-binaphthyl, 6,6-sinitro2
, 2'-dihydroxy-1,1'-binaphthyl, 4,4
'-dimethoxy-1,1'-dihydroxy-2,2'
-binaphthyl, bis(2-hydroxy-1-naphthyl)
methane, etc.], methylene bisphenols [e.g. 1.1
-bis(2-hydroxy-3,5-dimethylphenyl)
-3゜5.5-1-limethylhexane, 1.1-bis(
2-hydroxy-3-tert-butyl-5-methylphenyl)methane, 1,1-bis(2-hydroxy-3,
5-di-tert-butylphenyl)methane, 2.6-
Methylenebis(2-hydroxy-3-tert-butyl-5-methylphenyl)-4-methylphenol, α-
phenyl-α,α-bis(2-hydroxy-3-ter
t-Butyl-5-methylphenyl)methane, 1,1-bis(2-hydroxy-3,5-dimethylphenyl)-2
-Methylpropane, 1,1,5,5-tetrakis(2-
Hydroxy-3,5-dimethylphenyl)-2,4-ethylpentane, 2,2-bis(4-hydroxy-3,5
-dimethylphenyl)propane, 2,2-bis(4-hydroxy-3-methyl-5-tert-butylphenyl)propane, 2,2-bis(4-hydroxy-3,5-
tert-butylphenyl)propane, etc.], ascorbic acids, 3-pyrazolidones, pyrazolones, hydrazones, and paraphenylenediamines.

These developing agents mentioned above can also be used alone or in combination of two or more.

The amount of the reducing agent used in the heat-developable photosensitive material of the present invention depends on the type of photosensitive silver halide, the type of organic acid silver salt, and the type of other additives used, but usually is 0.01 per mole of photosensitive silver halide
-1500 mol, preferably 0.1-20
It is 0 mole.

Examples of the binder used in the heat-developable photosensitive material of the present invention include synthetic or natural polymers such as polyvinyl butyral, polyvinyl acetate, ethyl cellulose, polymethyl methacrylate, cellulose acetate butyrate, polyvinyl alcohol, polyvinylpyrrolidone, gelatin, and phthalated gelatin. One or more molecular substances can be used in combination. In particular, it is preferable to use gelatin or a derivative thereof together with a hydrophilic polymer such as polyvinylpyrrolidone or polyvinyl alcohol, and more preferably the following binder described in JP-A-59-229556.

This binder includes gelatin and vinylpyrrolidone polymer. The vinylpyrrolidone polymer may be polyvinylpyrrolidone, which is a homopolymer of vinylpyrrolidone, or a copolymer (including a graft copolymer) of vinylpyrrolidone and one or more monomers copolymerizable with vinylpyrrolidone. ). These polymers can be used regardless of their degree of polymerization. The polyvinylpyrrolidone may be substituted polyvinylpyrrolidone, and preferred polyvinylpyrrolidone has a molecular weight of i, ooo to
400,000. Other monomers that can be copolymerized with vinyl lolidone include (meth)acrylic acid esters such as acrylic acid, methacrylic acid and alkyl esters thereof, vinyl alcohols, vinyl acetates, vinyl imidazoles, and (meth)acrylamides. , vinyl carbinols, vinyl alkyl ethers, etc., but it is preferable that at least 20% (by weight, the same applies hereinafter) of the composition is polyvinylpyrrolidone. Preferred examples of such copolymers have a molecular weight of 5,000 to 400,000.

The gelatin may be lime-treated or acid-treated, and may be ossein gelatin, big skin gelatin, hydrogelatin, or modified gelatin obtained by esterifying or phenylcarbamoylating these gelatins.

In the above binder, gelatin preferably accounts for 10 to 90% of the total binder amount, more preferably 20 to 60%, and vinylpyrrolidone accounts for 5 to 90%.
It is preferably 10 to 80%, more preferably 10 to 80%.

The binder may contain other polymeric substances,
Gelatin and a mixture of polyvinylpyrrolidone with a molecular weight i, ooo ~ 400,000 and one or more other polymeric substances, gelatin and a molecular weight i 15,000 ~ 400
, 000 vinylpyrrolidone copolymer and one or more other polymeric substances is preferred. Other polymeric substances that may be used include polyvinyl alcohol, polyacrylamide, polymethacrylamide, polyvinyl butyral, polyethylene glycol, polyethylene glycol ester, or proteins such as cellulose derivatives, and polysaccharides such as starch and gum arabic. Examples include natural substances. These range from 0 to 85%, preferably from 0 to 85%.
It may be contained in an amount of 70%.

Note that the vinyl pyrrolidone polymer may be a crosslinked polymer, but in this case, it is preferable to crosslink it after coating it on the support (including the case where the crosslinking reaction progresses by leaving it to stand).

The amount of binder used is usually between 0 and 50 g per layer per 1 f of support, preferably 0.1 g.
~10g.

In addition, the binder is 081
It is preferable to use ~10 g, and examples of the support used in the photothermographic material of the present invention are more preferably polyethylene film, cellulose acetate film and polyethylene terephthalate film, synthetic plastic films such as polyvinyl chloride, photographic base paper, Examples include paper supports such as printing paper, baryta paper, and resin coated paper, as well as supports obtained by coating and curing an electron beam curable resin composition on these supports.

r.d.--Hereinafter, the heat-developable photosensitive material of the present invention, and when the photosensitive material is of a transfer type and uses an image-receiving member, various heat solvents may be added to the heat-developable photo-sensitive material and/or the image-receiving member. It is preferable that The thermal solvent used in the present invention is a compound that promotes thermal development and/or thermal transfer. These compounds are described in, for example, U.S. Pat. No. 3,347,675, U.S. Pat.
9556, Japanese Patent Application No. 59-47787, etc., and those particularly useful in the present invention include urea derivatives (e.g., dimethylurea, diethylurea, phenylurea, etc.). ),
Amide derivatives (e.g., acetamide, benzamide, etc.), polyhydric alcohols (e.g., 1,5-bentanediol, 1,6-bentanediol, 1,2-cyclohexanediol, pentaerythritol, trimethylolethane, etc.), or polyethylene Examples include glycols.

Among the above thermal solvents, water-insoluble solid thermal solvents described below are more preferably used.

A water-insoluble solid thermal solvent is a compound that is solid at room temperature but becomes liquid at high temperatures (60°C or higher, preferably 100°C or higher, particularly preferably 130°C or higher and 250°C or lower), and is an inorganic/organic compound. Ratio (“Organic Conceptual Diagram” Yoshio Koda,
Sankyo Shuppan ■, 1984) is in the range of 0.5 to 3.01, preferably 0.7 to 2.5, particularly preferably 1.0 to 2.0, and the solubility in water at room temperature is 1. Refers to smaller compounds.

Specific examples of water-insoluble solid thermal solvents are shown below, but the invention is not limited thereto.

Exemplary Water-Insoluble Solid Hot Solvent Melting Point (°C) Inorganic/Organic C(C)3CONIJ2. 14
F 1.44 Melting point (°C) Inorganic/Organic A point (°C) None 1! /;'Nco1((11;;13 melting point (°C) Inorganic/Organic CH3-Q-5302NJ(CzH4NH8Oza-C
H3168' 1.59 Many compounds used as water-insoluble solid heat solvents are commercially available, and can be easily synthesized by those skilled in the art.

The method of adding the water-insoluble hot solvent is not particularly limited, but it may be added by grinding and dispersing it using a ball mill, sand mill, etc.
There are methods such as adding it by dissolving it in an appropriate solvent, and adding it as an oil-in-water dispersion by dissolving it in a high boiling point solvent.
It is preferable to pulverize and disperse the solid particles using a ball mill, sand mill, etc. and add them while maintaining the solid particle shape.

Layers to which the water-insoluble solid thermal solvent is added include a photosensitive silver halide emulsion layer, an intermediate layer, a protective layer, an image-receiving layer of an image-receiving member, and the like, so that the respective effects can be obtained.

The amount of the water-insoluble heat solvent added is usually 10% to 500% by weight, preferably 50% to 300% by weight of the binder.

Note that even when the melting point of the water-insoluble solid thermal solvent of the present invention is higher than the thermal development temperature, the melting point is lowered by being added to the binder, so that it can be effectively used as a thermal solvent.

The photothermographic material of the present invention may contain various additives in addition to the above-mentioned components, if necessary.

For example, melt formers such as acetamide and succinimide described in U.S. Pat. No. 3,438.776; compounds such as polyalkylene glycols described in U.S. Pat. No. 3,666.477 and JP-A-51-19525; , -C〇-1-3O2- described in U.S. Pat. No. 3,667,959
There are non-aqueous polar organic compounds having a melting point of 20° C. or higher, such as lactones having 1-80- groups.

Furthermore, benzophenone derivatives described in JP-A-49-115540, JP-A-53-24829 and JP-A-53-24829;
Phenol derivatives described in No. 60223, JP-A-5
Carboxylic acids described in No. 8-118640, polyhydric alcohols described in JP-A-58-198038,
Also included are sulfamoylamide compounds described in JP-A-59-84236.

Further, a color toning agent known in heat-developable photosensitive materials may be added as a development accelerator to the photothermographic material of the present invention. As a color toning agent, for example, JP-A-46-4
No. 928, No. 46-6077, No. 49-5019,
49-5020, 49-91215, 4
No. 9-101727, No. 50-2524, No. 50-
No. 67132, No. 50-67641@, No. 50-114
No. 217, No. 52-33722, No. 52-99813
No. 53-1020, No. 53-55115, No. 53-76020, No. 53-125014, No. 54
-156523, 54-156524, 54
-156525, 54-156526, 55
-4060, 55-4061, 55-3201
No. 5, as well as West German Patent No. 2.140.406, West German Patent No. 2,141°063, West German Patent No. 2,220,618, US Patent No. 3,847,612, West German Patent No. 3.782.
941@, same No. 4,201,582 and JP-A-57
-207244, 57=207245, 58-
Phthalazinone, phthalimide, pyrazolone, quinazolinone, N-hydroxynaphthalimide, benzoxazine, naphthoxazinedione, 2,3-dihydro-phthalazine, which are compounds described in the specifications of No. 189628 and No. 513-1937141, etc. Zeon, 2.3
-dihydro-1,3-oxazine-2,4-sion, oxypyridine, aminopyridine, hydroxyquinoline,
Aminoquinoline, isocarbostyryl, sulfonamide, 2H-1,3-benzothiazine-2,4-(3H)dione, benzotriazine, mercaptotriazole, dimercabutotetrazapentalene, aminomercaptotriazole, acylaminomercaptotriazole phthalate acid, naphthalic acid, phthalamic acid, etc.
a mixture of one or more with an imidazole compound,
Also, mixtures of at least one acid or acid anhydride such as phthalic acid and naphthalic acid and a phthalazine compound, furthermore, phthalazine and maleic acid, itaconic acid, quinolinic acid,
Examples include combinations of gentisic acid and the like.

As antifoggants, for example, U.S. Pat. No. 3,645,
Higher aliphatic compounds (e.g. behenic acid, stearic acid, etc.) described in No. 739, mercuric salts described in Japanese Patent Publication No. 4γ-11113, N, described in Japanese Patent Application Publication No. 47419/1983
- halogen compounds (e.g. N-halogenoacetamide,
N-halogenosuccinimide, etc.), U.S. Patent Nos. 3 and 7
00, 457, mercapto compound releasing compound described in JP-A No. 51-50725, JP-A No. 49-125016
Aryl sulfonic acids (e.g. benzenesulfonic acid etc.) described in No. 51-47419, carboxylic acid lithium salts (e.g. lithium laurate) described in No. 51-47419, British Patent No. 1
, 455,271, oxidizing agents (e.g. perchlorates, inorganic peroxides, persulfates, etc.) described in JP-A-50-101,019, sulfinic acids or thiosulfones described in JP-A-53-19825. Acids, 2-thiouracils described in No. 51-3223, simple sulfur described in No. 51-26019, No. 51-42529, No. 51-811
Disulfide and polysulfide compounds described in No. 24 and No. 55-93149, rosins or diterpenes (e.g. adoedic acid, pimaric acid, etc.) described in No. 51-57435, and compounds described in No. 51-1043.38. Polymeric acids with free carboxyl or sulfonic acid groups, thiazolinthione described in U.S. Pat. No. 4,138,265, JP-A-54-51821, U.S. Pat.
．． 1,2,4-triazole or 5-mercapto-1,2,,4-1-riazole described in No. 137.079, thiosulfinic acid esters described in No. 55-140833, and thiosulfinic acid esters described in No. 55-142331. 1.2.
3.4-Thiatriazoles, No. 59-46641,
Examples include dihalogen compounds or trihalogen compounds described in No. 59-57233 and No. 59-57234, and diol compounds described in No. 59-111636.

In addition, as other antifoggants, Japanese Patent Application No. 59-565
Hydroquinone derivatives described in No. 06 (e.g., di-t
-octylhydroquinone, dodecanylhydroquinone, etc.) or the hydroquinone derivatives described in Japanese Patent Application No. 1983-66380, and benzotriazole derivatives (e.g., 4-sulfobenzotriazole, 5-carpoxybenzotriazole, etc.) are preferably used in combination. I can do it.

Further particularly preferred antifoggants include the inhibitors having hydrophilic groups described in Japanese Patent Application No. 60-218169, the polymer inhibitors described in Japanese Patent Application No. 60-262177, and the polymer inhibitors described in Japanese Patent Application No. 60-262177. Examples include compounds having a ballast group described in No. 60-263564.

As a silver image stabilizer, U.S. Patent No. 3.707.37
Polyhalogenated organic oxidizing agents (e.g., tetrabromobutane, tribromoquinaridine, etc.) described in Belgian Patent No. 768.071;
~xycarbonylthio 1-phenyltetrazole, monohalo compounds described in JP-A-50-119624 (e.g., 2-bromo-2-tolylsulfonylacetamide, etc.), bromine compounds described in JP-A-50-120328 ( Examples include 2-bromomethylsulfonylbenzothiazole, 2,4-bis(tribromomethyl)-6-methyltriazine, etc.), and tribromoethanol described in JP-A-53-46020. Also, the 1970s
Various monohalogenated organic antifoggants for silver halide emulsions, such as those described in Japanese Patent Application No. 119624, can be used.

Other image stabilizers, such as U.S. Pat. No. 3.220;
No. 846, No. 4,082,555, No. 4,088
, No. 496, JP-A-50-22625, Research Disclosure (RD) No. 12021, No. 1516
No. 8, No. 15567, No. 15732, No. 1573
No. 3, No. 15734, No. 15776, etc. Compounds called activator precursors that release basic substances by heat, such as compounds such as guanidinium trichloroacetate that release bases by decarboxylation with heat, galactonamide Aldonamide compounds such as
Compounds such as amine imides and 2-carboxycarboxamides, as well as JP-A-56-130745 and JP-A-56-130745.
Sodium phosphate J8 group generator described in No. 132332, compound generating amine by intramolecular nucleophilic reaction described in British Patent No. 2,079,480, JP-A-59
Aldoxime carbamates described in No.-157637, hydroxamic acid carbamates etc. described in No. 59-166943, and No. 59-180537, No. 5
Examples include base release agents described in No. 9-174830 and No. 59-195237.

Furthermore, U.S. Patent No. 3,301,678, U.S. Pat.
．． No. 444, No. 3,824,103, No. 3.844
．． Iridium-based compounds, S-rubamoyl derivatives of mercapto-containing compounds, and nitrogen-containing heterocyclic compounds described in US Pat. Activator stabilizer and activator stabilizer described in Patent Nos. 3,669,670, 4,012,260, 4,060,420, 4,207,392, RD 15109, RD 17711, etc. A element-containing i-base called a precursor, such as α-sulfonylacetate or trichloroacetate of 2-aminothiazoline, and an acylhydrazine compound are used for the purpose of accelerating development or for stabilizing the image, respectively. I can do it.

Also, for example, JP-A-56-130745 and JP-A-59-2
Development may be carried out in the presence of a small amount of water as described in U.S. Pat. 3,
312,550 and the like, development may be carried out using hot steam, hot air containing moisture, or the like. Also, compounds that release water into heat-developable photosensitive materials, such as Japanese Patent Publication No. 44-26
Compounds containing water of crystallization such as those described in No. 582, such as sodium phosphate dodecahydrate and ammonium alum diquadrate, may be incorporated into the photothermographic material.

In addition, various additives such as antihalation dyes, optical brighteners, hardeners, antistatic agents, plasticizers, and spreading agents, coating aids, and the like may be used.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or a non-photosensitive layer (for example,
Colloidal silica can be used for the undercoat layer, intermediate layer, protective layer, etc.).

The colloidal silica used in the present invention is a colloidal solution of silicic anhydride with an average particle size of 3 to 120 mμ mainly using water as a dispersion medium, and the main component is 5iO2 (silicon dioxide).
It is. Regarding colloidal silica, for example, JP-A-56-109336, JP-A-53-123916, JP-A-5
It is described in No. 3-112732, No. 53-100226, etc. The amount of colloidal silica used is 0.05 to 0.05 to the binder of the layer to be mixed and coated in terms of dry weight ratio.
A range of 2.0 is preferred.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or a non-photosensitive layer (for example,
An organic fluoro compound can be used for the undercoat layer, intermediate layer, protective layer, etc.).

Regarding organic fluoro compounds used in the present invention, US Pat. No. 3,589,906 and US Pat.
No. 3,754,924, No. 3.775.126, No. 3.850.640, West German Patent Publication Box 1,942
, No. 665, No. 1,961,638, No. 2.124,
No. 262, British Patent No. 1,330,356, Belgian Patent No. 742,680, and JP-A-46-7781, No. 48-9715, No. 49-46733, No. 49
-133023, 50-99529, 50-1
No. 1322, No. 50-160034, No. 51-431
No. 31, No. 51-129229, No. 51-10641
No. 9, No. 53-84712, No. 54-111330
No. 56-109336, No. 59-30536, No. 59-45441, and compounds described in Japanese Patent Publications No. 47-9303, No. 48-43130, No. 59-5887, etc. can be preferably used.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or
Alternatively, an antistatic agent can be used in a non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.).

As the antistatic agent used in the present invention, British Patent No. 1
, No. 466.600, Research Disclosure t-
(Research [) 1 closure)
No. 15840, No. 16258, No. 16630, U.S. Patent No. 2,327,828, U.S. Patent No. 2,861,056
No. 3,206,312, No. 3,245,833, No. 3,428,451, No. 3.775.126,
No. 3,963.498, No. 4,025,342,
No. 4,025,463, No. 4.025,691,
Compounds described in 4,025,704 etc. are mentioned,
These can be preferably used.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or
Alternatively, an ultraviolet absorber can be used in a non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.).

As the ultraviolet absorber used in the present invention, benzophenone compounds (for example, those described in JP-A-46-2784, U.S. Pat. No. 3,215,530, and U.S. Pat. No. 3,698,907), butadiene compounds (for example, , U.S. Patent No. 4
．． 045.229), 4-thiazolidone compounds (e.g., those described in U.S. Pat. No. 3,314,794 and U.S. Pat. No. 3,352,681), benzotriazole compounds substituted with an aryl group [ For example,
-10466, 41-1687, 42-26
No. 187, No. 44-29620, No. 4g-41572
No., JP-A-54-95233, JP-A No. 57-142975
No. 3,253,921, U.S. Pat. No. 3,533.
No. 794, No. 3.754.919, No. 3.794
．． No. 493, No. 4.009,038, No. 4,220
, No. 711, No. 4,323,633, Research Disclosure
re ) 22519], benzoxidol compounds (e.g., U.S. Pat. No. 3.i'0014
55), cinnamate ester compounds (for example, U.S. Pat. No. 3.705.805, U.S. Pat. No. 3.707.
No. 375 and JP-A No. 52-49029). Additionally, U.S. Patent No. 3,499.
762 and JP-A-54-48535 can also be used. UV-absorbing couplers (e.g.
α-naphthol cyan dye-forming couplers) and ultraviolet-absorbing polymers (e.g., JP-A-58-11194
No. 2, No. 178351, No. 181041, No. 59-
No. 19945, No. 23344, and those described in the official gazette).

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or
Alternatively, a hardening agent can be used in a non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.).

Hardeners used in the present invention include aldehyde-based and aziridine-based hardeners (for example, PB Report 19,921, U.S. Patent No. 2.950.197, U.S. Patent No. 2.964.404).
No. 2,983,611, No. 3,271,17
Specifications of No. 5, Japanese Patent Publication No. 46-40898, Japanese Patent Application Publication No. 1973
No. 0-91315), isoxazole systems (for example, those described in U.S. Pat. No. 331.609), epoxy systems (for example, U.S. Pat.
47,394, West German Patent No. 1,085,663, British Patent No. 1,033,518, and Japanese Patent Publication No. 4B
-35495>, vinyl sulfone type (for example, PB Report 19,920, West German Patent No. 1)
, No. 100,942, No. 2,337,412, No. 2,
No. 545.722, No. 2,635,518, No. 2.7
No. 42.308, 2. ．． No. 749.260, British Patent No. 1,251,091, Japanese Patent Application No. 1983-54236,
No. 48-110996, U.S. Patent No. 3, 539.64
4, 3,490,911), acryloyl-based (for example, Japanese Patent Application No. 48-27
No. 949, U.S. Pat. No. 3,640.7'20), carbodiimides (for example, U.S. Pat. No. 2,938,892, U.S. Pat. No. 4,043,818,
Specifications of No. 4,0611499, Japanese Patent Publication No. 46-38
No. 715, those described in Japanese Patent Application No. 49-15095), triazine-based (for example, West German Patent No. 2,41)
No. 0,973, No. 2,553.915, U.S. Patent No. 3
, 325,287, JP-A-52-1272
2), maleimide-based, acetylene-based, methanesulfonic acid ester-based, and N-methylol-based hardeners can be used alone or in combination. As a useful combination technique, for example, West German Patent No. 2,447,
No. 587, No. 2,505.746, No. 2,514,2
No. 45, U.S. Patent No. 4,047,957, U.S. Patent No. 3,83
Specifications of No. 2,181, No. 3.840.370, JP-A No. 48-43319, No. 50-63062, No. 5
Examples include combinations described in Japanese Patent Publications No. 2-127329 and Japanese Patent Publication No. 48-32364.

The thermo-mechanical optical material of the present invention includes a heat-developable photosensitive layer and/or
Alternatively, a polymer hardener can be used in a non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.).

Examples of the polymeric hardener used in the present invention include polymers having aldehyde groups (e.g., acrolein copolymers, etc.) described in U.S. Pat. No. 3,396,029.
, No. 3,362,827, Research Disclosure No. t-17333 (1978), etc., polymers having dichlorotriazine groups, US Pat. No. 3.62
3.878, Research Disclosure No. 16125 (1978)
), U.S. Patent No. 4,161,407, Japanese Patent Publication No. 1983-
Examples thereof include polymers having an active vinyl group or a group that can be a precursor thereof, as described in Japanese Patent Laid-open No. 65033 and Japanese Patent Publication No. 56-142524, and polymers having an active ester group as described in JP-A No. 56-66841.

In the heat-developable photosensitive material of the present invention, a polymer latex is used in the heat-developable photosensitive layer and/or the non-photosensitive layer (e.g., undercoat layer, intermediate layer, protective layer, etc.) for the purpose of improving the physical properties of the film. be able to.

Preferred specific examples of the polymer latex used in the present invention include polymethyl acrylate, polyethyl acrylate, poly-n-butyl acrylate, a copolymer of edyl acrylate and acrylic acid, a copolymer of vinylidene chloride and butyl acrylate, and a copolymer of butyl acrylate and acrylic acid. copolymers of vinyl acetate and butyl acrylate, copolymers of vinyl acetate and ethyl acrylate, copolymers of ethyl acrylate and 2-acrylamide, and the like.

The preferred average particle size of the polymer latex is 0.02 μm
~0.2μI. The amount of polymer latex used is 0.0 in dry form ratio to the binder of the added layer.
3 to O15 is preferred.

In the heat-developable photosensitive material of the present invention, various surfactants are added to the heat-developable photosensitive layer and/or non-photosensitive layer (e.g., undercoat layer, intermediate layer, protective layer, etc.) for the purpose of improving coating properties. Agents can be used.

The surfactant used in the present invention may be any of anionic, cationic, amphoteric and nonionic surfactants.

Examples of anionic surfactants include alkyl carboxylates, alkyl sulfonates, alkylbenzenesulfonates, alkylnaphthalenesulfonates, alkyl sulfates, alkyl phosphates, N
-carboxy groups, sulfo groups, such as acyl-N-alkyl taurines, sulfosuccinates, sulfoalkyl polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl phosphates, etc.
Those containing an acidic group such as a phospho group, a lil acid ester group, or a phosphoric acid ester group are preferred.

Examples of cationic surfactants include alkylamine salts, aliphatic or aromatic quaternary ammonium salts, heterocyclic quaternary ammonium salts such as pyridinium and imidazolium, and aliphatic or heterocyclic phosphonium or sulfonium salts. is preferred.

Preferred examples of the amphoteric surfactant include amino acids, aminoalkyl sulfonic acids, aminoalkyl sulfates or phosphoric esters, alkyl betaines, and amine oxides.

Examples of nonionic surfactants include saponin (steroid type), alkylene oxide derivatives (such as polyethylene glycol, polyethylene glycol/polypropylene glycol condensates, polyethylene glycol alkyl ethers or polyethylene glycol alkylaryl ethers, polyethylene glycol esters, polyethylene Glycol alkyl ethers, polyalkylene glycol alkyl amines or amides, silicone polyethylene oxide adducts), glycidol derivatives (e.g. alkenylsuccinic acid polyglycerides, alkylphenol polyglycerides), fatty acid esters of polyhydric alcohols, alkyl esters of sugars etc. are preferred.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or a non-photosensitive layer (for example, an undercoat layer, an intermediate layer, layer,
(protective layer, etc.) may contain non-photosensitive silver halide grains.

The non-photosensitive silver halide grains used in the present invention may have any silver halide composition such as silver chloride, silver bromide, silver iodide, silver iodobromide, silver chlorobromide, silver chloroiodobromide, etc. Can be used. The preferred grain size of the non-photosensitive silver halide grains is about 0.
．． It is 3 μm or less.

Also, the amount added is 0.00% in terms of silver amount for the layer to be added.
02 to 3 (J/f range is preferred.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or a non-photosensitive layer (undercoat layer,
(intermediate layer, protective layer, etc.), for example, JP-A-51-10433.
Vinyl polymers having carboxyl groups or sulfo groups as described in No. 8 can be included.

The amount of the vinyl polymer to be used is in the range of 0.05 to 2.0 in terms of dry weight ratio to the binder of the added layer.The photothermographic material of the present invention is preferably provided with a protective layer. Hereinafter, this will be referred to as the protective layer of the present invention.

The protective layer of the present invention includes each inom used in the photographic field.
Machining can be used. These additives include various matting agents, colloidal silica, slip agents, organic fluoro compounds (especially fluorosurfactants), antistatic agents, ultraviolet absorbers, high-boiling organic solvents, antioxidants, hydroquinone derivatives, and polymers. Latex, surfactants (including polymeric surfactants), hardeners (including polymeric hardeners),
Examples include organic silver salt particles and non-photosensitive silver halide particles.

The matting agent used in the protective layer of the present invention is fine particles of inorganic or organic substances that are incorporated into the photothermographic material to increase the roughness of the surface of the photosensitive material and make it matte. be.

Methods of using matting agents to prevent adhesion that occurs during manufacturing, storage, and use of photosensitive materials, and to prevent static electricity caused by contact, friction, and peeling between materials of the same or different types are known in the art. It is well known. Specific examples of matting agents include silicon dioxide described in JP-A-50-46316, JP-A-53-7231, JP-A-58-66937,
Alkali-soluble matting agents such as alkyl methacrylate/methacrylic acid copolymers described in JP-A No. 60-8894, alkali-soluble polymers having anionic groups described in JP-A-58-166341, JP-A-58-145935 A combination of two or more types of fine particle powders with different Mohs hardnesses, a combination of oil droplets and fine particle powders as described in JP-A-58-147734, two types with different average particle sizes as described in JP-A-59-149356 Combination of the above spherical matting agents, JP-A-56-4
The combined use of a fluorinated surfactant and a matting agent as described in British Patent No. 1,055.713, US Patent No. 1,939,213, US Patent No. 2,221.1173, British Patent No. 2.268. No. 662, No. 2.322.037, No. 2
, 376, 0 (No. 15, No. 2,391,1111,
ln12,701,245, ln2.992,101, ln3.079.257, ln3,262,782,
3,443. '146, 3,516.113
No. 2, No. 3,539.344, No. 3,591,37
No. 9, No. 3.754.924, No. 3.767.448
No., JP-A-49-106821, JP-A No. 57-14835
Organic matting agent described in No. 2, etc., West German patent 2.52
9.321, British Patent No. 760.775, 1.2
60.772, U.S. Patent No. 1,201,905, U.S. Patent No. 2.192.241, U.S. Pat.
No. 3,062,649, No. 3,257,206, No. 3.322.555, No. 3.353.958, No. 3
, No. 370,951, No. 3,411,907, No. 3,
No. 437,484, No. 3.5231022, No. 3,6
No. 15,554, No. 3,635,714, No. 3.76
No. 9,020, No. 4,021,245, No. 4.0
Inorganic matting agents described in No. 29.504, etc., or JP-A Nos. 46-7781 and 49-106821
No. 51-6017, No. 53-116143, No. 53-100226, No. 57-14835,
No. 57-82832, No. 53-70426, No. 59
Matting agents having physical properties such as those described in Publication No. 149357, Part 1)jl 57-9053, and the specification of EP-107,378 are preferably used.

In the protective layer of the present invention, the amount of the matting agent added is 10 mo/2. h is preferable, more preferably 2
0 m9 to 1.0 g. The particle size of the matting agent is 0.5-1
The thickness is preferably 0 μm, more preferably 1.0 to 6 μm.

The matting agents may be used in combination of two or more.

Examples of the slipping agent used in the protective layer of the present invention include solid paraffin, oils and fats, surfactants, natural waxes, and synthetic waxes.
No. 80,465, British Patent No. 955.061, No. 1,
143,118, 1.270.578, 1,3
No. 20.564, No. 1.320.757, Japanese Unexamined Patent Publication No. 1973
-5017, 51-141623, 54-1
No. 59221, No. 56-81841, Research Disclosure
e) 13969, U.S. Patent No. 1,263.72
No. 2, No. 2.588.765, No. 2,739,891
No. 3,018.178, No. 3.042.522
No. 3.080.317, No. 3.082,087
No. 3.121.060, No. 3.222.17
No. 8, No. 3.295.979, No. 3.489.567
No. 3,516,832, No. 3,658,573, No. 3,679,411, No. 3,870.521, etc. can be preferably used.

The protective layer of the present invention has a high boiling point and
Solvents (e.g., U.S. Pat. No. 2,322,027;
, No. 533,514, No. 2,882,157, Japanese Patent Publication No. 46-23233, British Patent No. 958,441, No. 1,222.753, U.S. Patent No. 2,353,262
No. 3,676, 142, 3,700,454, JP-A-50-82078, JP-A-51-27921,
Esters (e.g., phthalate esters, phosphoric acid esters, fatty acid esters, etc.), amides (e.g., fatty acid amide, sulfonic acid amide, etc.), ethers, alcohols, paraffins, etc., described in No. 51-141623, etc. Examples include. ) may contain oil droplets in which a water-insoluble oil compound is emulsified and dispersed. Furthermore, these oil droplets may contain photographic additives for various purposes.

Binders used in the protective layer of the present invention include polyvinyl butyral, polyvinyl acetate, ethyl cellulose, polymethyl methacrylate, cellulose acetate butyrate, polyvinyl alcohol, polyvinyl pyrrolidone, polyethyl oxazoline, polyacrylamide,
One or a combination of two or more synthetic or natural polymeric substances such as gelatin and phthalated gelatin can be used.

In particular, gelatin (including gelatin derivatives), polyvinylpyrrolidone (preferably molecular weight 11,000-400,000), polyvinyl alcohol (molecular weight 1.000-1.
00.000) and polyoxazoline (preferably molecules 11,000 to 800.000) alone or in combination of two or more of these are preferred, and gelatin alone or gelatin and the above polyvinylpyrrolidone,
Particularly preferred is a binder in which a hydrophilic polymer having good compatibility with gelatin, such as polyvinyl alcohol and polyoxazoline, is used in combination. Gelatin may be lime-treated, acid-treated, or ion-exchange treated.
Ossein gelatin, big skin gelatin, hydrogelatin, or modified gelatin obtained by esterifying or phenylcarbamoylating these gelatins may also be used.

The thickness of the protective layer of the present invention is preferably 0.05 to 5 μm, more preferably 0.1 to 1.0 μm. Protection
! The layer may be a single layer or may be composed of two or more layers.

Further, in order to increase film strength and prevent film destruction, it is also preferable that the hardness of the protective layer is greater than that of the photosensitive layer. One way to make the hardness of the protective layer higher than that of the photosensitive layer, that is, to control the hardness of each layer, is to use a diffusion-resistant hardener. It can be protected by using it as a protective layer! ! ! Only the hardness of the layer can be greater than that of the photosensitive layer. Polymer hardeners are known as diffusion-resistant hardeners, such as those disclosed in U.S. Pat. No. 3,057.723 and 3.3.
No. 96.029, No. 4.161.407, JP-A @ 5
Hardeners described in No. 8-50528 and the like can be used.

Another way to control the degree of dura for each layer is to
Protection can be achieved by containing a diffusible hardener (for example, a vinyl sulfone hardener) only in the protective layer, or by making the content of the protective layer higher than that of the photosensitive layer, and quickly drying it after simultaneous multilayer coating. Layer 1ii! The rM degree can be greater than the hardness of the photosensitive layer.

The image-receiving layer of the image-receiving member that can be effectively used in the present invention includes:
It is sufficient that it has the function of receiving the dye in the heat-developable photosensitive layer released or formed by heat development, for example, a polymer contained in a tertiary amine or a quaternary ammonium salt, as described in US Pat.
, 709,690 are preferably used. For example, as a polymer containing an ammonium salt, the ratio of polystyrene-co-N,N,Nt-ly-n,-hexyl-N-vinyl-benzylammonium chloride is 1=4 to 4:1, preferably 1:1. belongs to.

Examples of polymers containing tertiary amines include polyvinyl lysine. A typical image-receiving layer for diffusion transfer is obtained by mixing a polymer containing ammonium salt, tertiary amine, etc. with gelatin, polyvinyl alcohol, etc., and coating the mixture on a support.

Another useful dye-receiving material is JP-A-57-2072.
The glass transition temperature described in No. 50 etc. is 40°C or higher, 2
Examples include those formed from a heat-resistant organic polymer material having a temperature of 50"C or less.

These polymers may be supported on a support as an image-receiving layer, or may themselves be used as a support.

Examples of the heat-resistant organic polymer substances include polystyrene, polystyrene derivatives having substituents having 4 or less carbon atoms, polyvinylcyclohexane, polydivinylbenzene,
Polyacetals such as polyvinylpyrrolidone, polyvinylcarbazole, polyallylbenzene, polyvinyl alcohol, polyvinyl formal and polyvinyl butyral, polyvinyl chloride, chlorinated polyethylene,
Polytrichloride fluorinated ethylene, polyacrylonitrile, poly N, N-dimethylallylamide, polyacrylate with p-cyanophenyl group, pentachlorophenyl group and 2,4-dichlorophenyl group, polyacrylic chloroacrylate, polymethyl methacrylate, poly Polyesters such as ethyl methacrylate, polypropyl methacrylate, polyisopropyl methacrylate, polyisobutyl methacrylate, poly tert-butyl methacrylate, polycyclohexyl methacrylate, polyethylene glycol dimethacrylate, poly-2-cyano-ethyl methacrylate, polyethylene terephthalate, polysulfone, bisphenol Δ Examples include polycarbonates such as polycarbonate, polyanhydrides, polyamides, and cellulose acetates. In addition, Polymer Handbook Second Edition (G.A. Brandlapp, E.H. Inmarg.
ymer Handbook 2nd ed, (
J., Brandrup, E.

John Wile
Also useful are synthetic polymers with a glass transition temperature below 40' CIJ, as described in the 2004 publication. Generally, the molecular weight of the polymer substance is 2.000 to 20.
0.000 is useful. These polymeric substances may be used alone or in a blend of two or more types, or may be used in combination of two or more types as a copolymer.

Useful polymers include cellulose acetate, such as triacetate, diacetate, heptamethylene diamine and terephthalic acid, fluororange, and may be formed by multiple layers.

As the support for the image-receiving member, any material such as a transparent support or an opaque support may be used. Supports containing pigments such as titanium oxide, barium sulfate, calcium carbonate, and talc, baryta paper, RC paper laminated with thermoplastic resin containing pigments on paper, cloth, glass, aluminum cum and other metals, and supports on which electron beam curable resin compositions containing pigments were coated and cured, and coated layers containing pigments were provided on these supports. Examples include supports.

In particular, a support that is coated with an electron beam curable resin composition containing a pigment on paper and cured, or a support that has a pigment coating layer directly on the paper or an electron beam curable resin composition on the pigment coating layer. The support coated with the composition and cured can be used as an image-receiving member as it is because the resin layer itself can be used as an image-receiving layer.

Polyamides made from combinations such as propylamine and adipic acid, hexamethylene diamine and diphenic acid, hexamethylene diamine and isophthalic acid, polyesters made from combinations such as diethylene glycol and diphenylcarboxylic acid, bis-p-carboxyphenoxybutane and ethylene glycol, and polyethylene terephthalate. 1 to polycarbonate 1. These polymers may be modified. For example, cyclohexane dimetatool, isophthalic acid, methoxypolyethylene-
Polyethylene terephthalate using glycol, 1,2-dicarbomethoxy-4-benzenesulfonic acid, etc. as a modifier is also effective.

A particularly preferable image-receiving layer is JP-A-59-22342
Layer made of polyvinyl chloride described in No. 5 and JP-A-60
Examples include a layer made of polycarbonate and a plasticizer described in Japanese Patent No. 19138.

These polymers can also be used as a support and an image-receiving layer (image-receiving member), in which case the support may be formed from a single layer, or the present invention can be applied to heat-developable color photosensitive materials. The various polymers described above can be used as the image-receiving layer as a mordant for dye images, but the image-receiving layer may be a separate element comprising the image-receiving layer on a suitable support or the image-receiving layer may be The layer may be a single layer that is part of a heat-developable color photographic material. If necessary, an opacifying layer (reflection layer) can be included in the light-sensitive material, which layer transmits the desired amount of radiation, e.g. visible light, which can be used to observe the dye image in the receptor III layer. It is used for reflection. The opacifying layer (reflective layer) can contain various reagents that provide the necessary reflection, such as titanium dioxide.

The image-receiving layer of the image-receiving member can also be formed into a type that can be peeled off from the heat-developable photosensitive layer. For example, after imagewise exposure of a heat-developable color photosensitive material, an image-receiving layer can be superimposed on the heat-developable photosensitive layer and uniformly heat-developed. Further, after imagewise exposure and uniform heat development of the heat-developable color light-sensitive material, an image-receiving layer may be superimposed and heated at a temperature lower than the development temperature to transfer the dye image released or formed from the dye-providing substance.

The heat-developable photosensitive material of the present invention is imagewise exposed normally at 80°C to 20°C.
1 at a temperature range of 0°C, preferably ioo°C to 170°C.
Developing can be carried out by simply heating for 1.5 seconds to 120 seconds, preferably 1.5 seconds to 120 seconds. The transfer of the diffusible dye to the image-receiving layer may be carried out simultaneously with heat development by bringing the image-receiving member into close contact with the photosensitive surface of the photosensitive material and the image-receiving layer during heat development;
The image may be transferred by being brought into close contact with an image receiving member after thermal development and heated, or by being brought into close contact with an image receiving member after supplying water and further heated if necessary. Also, before exposure, 70℃~180℃
Preheating may be carried out at a temperature within the range. Also, JP-A-60
As described in Japanese Patent Application No. 143338 and Japanese Patent Application No. 130-3644, the photosensitive material and the image-receiving member are preheated at a temperature of 80°C to 250°C immediately before thermal development transfer to improve mutual adhesion. Good too.

Various exposure means can be used for the photothermographic material according to the present invention. The latent image is obtained by imagewise exposure to radiation, including visible light. Generally, light sources used for ordinary color printing, such as tungsten lamps, mercury lamps, xenon lamps, laser beams, CRT beams, etc., can be used as the light source.

As the heating means, all methods applicable to ordinary heat-developable photosensitive materials can be used, such as contacting with a heated block or plate, contacting with a heated roller or drum, passing through a high-temperature atmosphere, etc. Alternatively, high-frequency heating may be used, or furthermore, a conductive layer containing a conductive substance such as carbon black may be provided on the back surface of the photosensitive material of the present invention or the back surface of the image receiving member for thermal transfer, and the Joule heat generated by energization may be utilized. You can also do that. There are no particular restrictions on the heating pattern, including methods of preheating (breheating) and then reheating, heating at a high temperature for a short time, or at a low temperature for a long time, continuously increasing, decreasing, or repeating, and even discontinuously. Although heating is possible,
A simple pattern is preferred. Alternatively, a method in which exposure and heating proceed simultaneously may be used.

Furthermore, the compound of the present invention is also effective for heat-developable photosensitive materials (dry silver) in which images are formed only on silver.

[Effect of the invention] The compound represented by the general formula (1) and the novel general formula (
By using the present invention in combination with the compound represented by 2), it was possible to obtain images with high density and no fog. Moreover, this property is maintained even when stored under conditions of high temperature and high humidity, which is an epoch-making invention.

[Specific Examples of the Invention] Hereinafter, the present invention will be specifically explained using Examples, but the embodiments of the present invention are not limited to these.

Example 1 [Preparation of photosensitive silver halide] At 50°C, JP-A-57-92523, JP-A-57-9
Using the mixer shown in the specification of No. 2524, a solution A prepared by dissolving ossein gelatin 20a in 1000 iR of distilled water and ammonia, 500 iR of an aqueous solution containing potassium iodide 11,620 and potassium bromide 130.9 (I) was added. .i
By adding Solution B and 500 d of Solution C, an aqueous solution containing 1 mol of silver nitrate and ammonia, while keeping the pAg and pH constant, and controlling the addition rate of Solution B and Solution C, silver iodide-containing solution was added. Amount 7 mol%, regular hexahedron, average particle size 0.1
A core grain of 5 μm was prepared, and then coated with a shell having a silver iodide content of 1 mol % and a thickness of 0.05 μm in the same manner to obtain a core/shell type iodide grain with a regular hexahedron and an average grain size of 0.02 μm. Silver oxide particles were prepared.

(The monodispersity was 8%.) The yield after washing with water and sharpening was 7%.
00 was strict.

Preparation of photosensitive silver halide dispersion (1) The silver halide grains prepared above were subjected to sulfur sensitization treatment with sodium thiosulfate in the presence of the following spectral sensitizing dye (1),
A photosensitive silver halide dispersion having the following composition was prepared.

The photosensitive silver halide 700d gelatin 32 (1 sodium thiosulfate 10n+g spectral sensitizing dye (1
) 0.5% methanol solution 170d Add distilled water to obtain 282fh&' Spectral sensitizing dye (1) [Preparation of organic silver salt dispersion] React 5-methylbenzotriazole and silver nitrate in a water-methanol mixed solvent. 5-methylbenzotriazole silver 28.8Q obtained in step V and poly-N-vinylpyrrolidone 16. 1501p of water containing Ojl was dispersed in an alumina ball mill to give a pl-15,5 to prepare a 5-methylbenzotriazole silver dispersion 2GOd.

[Preparation of magenta dye-providing substance dispersion (1)] Exemplary dye-providing substance (PM-4) 4B, 9 (J and 2,5-di-t-
2.5g of octylhydroquinone in ethyl acetate 2001
A 5% aqueous solution by weight of Alkanol
After mixing with 7201 g of an aqueous solution containing 0.5 (I, dispersing with an ultrasonic homogenizer, and distilling off ethyl acetate,
7951 g of magenta dye-providing substance dispersion (1) was prepared at pH 5.5.

[Reducing agent solution (1) made by Wi] Exemplary reducing agent (R-11) 23.3 (1, poly(N-vinylpyrrolidone) (molecular weight 30.000) +4.6 and the following fluorine-based surfactant 0 Reducing agent solution (1) 250 nβ was prepared by dissolving .50 (] in water and using it as 5.5 on day 0.

Fluorine surfactant [Preparation of hot solvent dispersion] 1) 1.0% by weight aqueous solution of 430 g of -1 to Ruamide and polyvinylpyrrolidone (K-90) 1.410112
was dispersed in a ball mill to obtain a hot solvent dispersion.

[Preparation of heat-developable photosensitive material (1)] Each of the photosensitive silver halide dispersions 6 prepared above
．． 0d, organic silver salt dispersion 4.20d, dye-donor dispersion (1) 26.51+2, reducing agent solution 4.2d.

Heat solvent dispersion 14.8 () and phenylcarbamoylated gelatin and gelatin were mixed to make a 10% aqueous solution 7.6- mixed, and tetra(vinylsulfonylmethyl)methane and taurine were added as a hardening agent. Reacted at 1:1 (weight ratio), phenylcarbamoylated gelatin 1%
2.5% of tetra(vinylsulfonylmethyl)methane dissolved in an aqueous solution to a concentration of 3%
019 After adjusting the pH to 5.5 in a 10% citric acid aqueous solution, a silver amount of 1.31 g/
A protective layer consisting of a mixture of the phenylcarbamoylated gelatin, gelatin, poly(N-vinylpyrrolidone) and pt-ramide was further provided thereon.

Next, except for adding the compounds represented by the general formulas (1) and (2) of the present invention shown in Table 1,
) Photothermographic materials (2) to (16) were produced in exactly the same manner as in (1).

At this time, the compound represented by the general formula (1) of the present invention has 0
．． The compound represented by the general formula (2) of the present invention is added as a 1% methanol solution, and the compound represented by the general formula (2) of the present invention is added as a 1% methanol solution.
) and 2.5-di(-octylhydroquinone) were dissolved in ethyl acetate and added.

[Preparation of image receiving member (1)] Polycarbonate (Yojin Kasei L) was placed on photographic baryta paper.
-1250, published by [i25,000>] Polycarbonate was coated with ethylene chloride solution of 15.011/1
An image receiving member (1) was prepared in such a manner that the number of particles was 12.

The heat-developable photosensitive materials (1) to (16) are exposed to light through a step wedge, and together with the image-receiving member (1), the heat-developable photosensitive materials (1) to (16) are placed in a heat developing machine (developer module 217.3M).
After heat development was carried out at 150°C for 1 minute using a photothermographic material (manufactured by Co., Ltd.), the photothermographic material and the image receiving member were immediately peeled off, and a magenta step wedge-shaped negative image was obtained on the polycarbonate surface of the image receiving member. Also, high temperature (50℃)
The green reflection density of both negative images obtained after being left for 30 hours at high temperature (relative temperature 80%) was measured using a densitometer (PDA-65, manufactured by Konishiroku Photo Industry Co., Ltd.).
Measured using Table 1 shows the minimum density (fog), maximum density, and desensitization rate due to standing. Here, the desensitization rate due to standing was calculated using the following formula.

Desensitization rate due to leaving - (1 - Sensitivity after leaving / Table before leaving - 1
From the results, the photothermographic material of the present invention either does not contain the compound of the present invention or only contains either the compound represented by the general formula (1) or the compound represented by the general formula (2) of the present invention. Compared to heat-developable photosensitive materials, it not only has lower fog compared to the maximum density, but also has less change in minimum density (fog) and maximum density even when stored under high temperature and high humidity, and has a low desensitization rate. It can be seen that the storage stability has been improved.

Example 2 Using the photosensitive silver halide grains prepared in Example 1, the photosensitive silver halide dispersion (1) was sensitized with sulfur at a concentration of 1.0 x 10-3 mol per mol of silver halide. A photosensitive silver halide dispersion (2) was prepared in the same manner except that the process was carried out in the presence of the compound A-27 of the present invention, and the photosensitive silver halide dispersion (1) was replaced with a photosensitive silver halide dispersion (1). A photosensitive material (17) was produced in the same manner as in Example (1) except that dispersion liquid (2) was used.

Further, except for adding compounds represented by general formulas (1) and (2) of the present invention shown in Table 2, the photothermographic material was
Heat-developable photosensitive materials (18) to (25) in the same manner as in 17>
was created.

For the heat-developable photosensitive materials (17) to (25), a part of the sample was left under high temperature and high humidity under the same conditions as in Example 1, exposed to light, and then heated using the image receiving member (1). Development processing was performed. The green reflection density of the magenta negative image obtained on the image receiving member was measured using a densitometer (PDA-65, Konishiroku Photo Industry).
(manufactured by Co., Ltd.). As is clear from the minimum density (fog) and maximum density results in Table 2, the photosensitive material of the present invention contains the compound represented by the general formula (1) of the present invention,
It was found that excellent effects can be seen even when added before chemical sensitization.

Example 3 [Preparation of photosensitive silver halide dispersion] Using the same photosensitive silver halide particles as used in Example 1, each color sensitivity of blue, green, and red was prepared in the same manner as in Example 1. A spectrally sensitized silver halide emulsion was prepared. However, the above-mentioned spectral sensitizing dye (1) was used as the green spectral sensitizing dye, and the following spectral sensitizing dyes were used in other cases.

Blue spectral sensitizing dye Red spectral sensitizing dye [Preparation of yellow dye-providing substance dispersion (1) and cyan dye-providing substance dispersion (1) 1 Exemplary dye-providing substance (PM
-4) 46.90 and yellow dye-providing substance (
PM-1) 23.3g and cyan dye-providing substance (P
A yellow dye-providing substance dispersion (1) and a cyan dye-providing substance dispersion (1) were prepared using exactly the same recipe except that M-5>45.99.

E Preparation of color clouding preventive agent dispersion (1) 1 Color clouding preventive agent (S C-1) 2s, og was dissolved in 801 g of ethyl acetate, and alkanol XC 5% by weight aqueous solution 5
0tc! , and an aqueous solution 254 containing 120 g of gelatin.
d and dispersed with an ultrasonic homogenizer, and ethyl acetate was distilled off to prepare a color clouding preventive agent dispersion (1).

[Preparation of yellow filter dye dispersion (1)] 20.0 g of yellow filter dye having the following structure was mixed with 1 1 of ethyl acetate.
20112, mixed with 25G-d of an aqueous solution containing 50 v (1 (+5) and phenylcarbamoylated gelatin 9.0 (1/ffi) of Alkanol Distill to obtain yellow filter dye dispersion (1) 300, Q
was prepared.

yellow filter dye C-1 CH.

■ With these, the photothermographic material with the multilayer structure shown in Table 3 (
26) to (37) were prepared, and at this time, compounds represented by the general formulas (1) and (2) of the present invention shown in Table 4 were added.

The heat-developable photosensitive materials (26) to (37) were exposed to 20,000 MS through a step wedge, combined with the image receiving member (1), and then heated using a heat developing machine (manufactured by Developer Module 277.3M). After thermal development was carried out at 150° C. for 1 minute, the photosensitive material and the image receiving member were immediately peeled off. For each sample, of the image receiving member,
B and G of the transferred dye image obtained on the polycarbonate surface
, R was measured using a densitometer (PDA-65, Konishi Roku Photo Industry Co., Ltd. (stock table-5)).
Compared to heat-developable photosensitive materials that do not contain the compound of the present invention or contain only either the compound represented by the general formula (1) or the compound represented by the general formula (2) of the present invention, Even when stored under humid conditions, there was little change in minimum density (fog) and maximum density, indicating that storage stability was improved.

Example 4 Exemplary dye-donor substance @30. Og to dimethyl lauramide 3
0.0 (l) and 90.0 d of ethyl acetate, 100 ml of Alkanol
800 i12 aqueous solution containing 12 and 36.0 g of gelatin
After dispersing with an ultrasonic homogenizer, ethyl acetate was distilled off and water was added to prepare a yellow dye-providing substance dispersion (2) of 900112. Exemplary dye-donor substance ■
and the exemplified dye-providing substance [phase] in the same manner,
A magenta dye-providing substance dispersion (2) and a cyan dye-providing substance dispersion (2) were prepared, respectively.

Furthermore, the following color clouding prevention agent (S C-2') 30.0
g, tricresyl phosphate 15.0 CI, ethyl acetate 9
Alkanol XC 5% by weight aqueous solution 5C dissolved in 0wQ
)+12 and gelatin 20. Aqueous solution containing OQ 560
112, dispersed with an ultrasonic homogenizer, and distilled off the ethyl acetate to obtain a color clouding preventive agent dispersion (2>6
00112 was prepared.

Color clouding prevention agent (SC-2,) Using these and the same silver halide emulsion and 5-methylbenzotrisol silver dispersion as used in Example 4,
Photothermographic materials (38') to (38') with multilayer structures shown in Table 6
48) was created. Further, at this time, the compounds shown in Table 7 were contained.

An image receiving member (2) was then prepared by sequentially applying the following layers onto a 200 μm thick polyethylene coated paper support.

(1) Neutralization layer made of polyacrylic acid (7,0 (1/v')).

(2) Timing layer consisting of cellulose acetate (4.0 g/i').

(3) Styrene and N-benzyl-N,N-dimethyl-1
! - A layer consisting of a 1:1 copolymer of (3-maleimidopropyl) ammonium chloride (3,00/w') and acid-treated gelatin (3,0 (1/i')).

(4) A layer consisting of urea (4, Og/n') and polyvinyl alcohol (saponification degree 98%) (3,0 (J/v2)).

However, each layer also contains a small amount of a surfactant and a hardening agent in addition to these.

The heat-developable photosensitive materials (38) to (48) are exposed to 4,000 CM S through a step wedge;
After combining with the image receiving member (2), 14
After thermal development was performed at 0° C. for 1 minute, the photosensitive material and the image receiving member were quickly peeled off. The reflection density of the transferred dye image obtained on the image receiving member for each sample was measured using a densitometer (PDA-
65, manufactured by Konishiroku Photo Industry Co., Ltd.) and are shown in Table 8.

From the results shown in Table 8, the photothermographic material of the present invention has a high density and improved fog, does not increase fog even under high temperature and high humidity, has a stable maximum density, and has excellent storage stability. is clear.

Claims (1)

[Scope of Claims] A heat-developable photosensitive material having a layer containing photosensitive silver halide on a support, at least one compound selected from the following general formula (1) and the following general formula (
2) A heat-developable photosensitive material containing at least one compound selected from the compounds represented by 2). General formula (1) X_1-L_1-A [wherein, X_1 represents a residue of a photographic inhibitor,
represents a simple bond or a divalent group, and A represents a hydrogen atom, an amino group, a hydroxyl group, a carboxyl group or a salt thereof, a sulfo group or a salt thereof, or a sulfinic acid group or a salt thereof. ] General formula (2) X_2-L_2-B [In the formula, X_2 represents a residue of a photographic inhibitor, and L_2
represents a divalent group, and B represents a ballast group. ]