JPH0573225B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a heat-developable color photosensitive material, and more particularly to a heat-developable color photosensitive material in which a transferred image is formed by transferring a diffusible dye formed by heat development. [Background of the Invention] In recent years, heat-developable photosensitive materials whose development process can be performed by heat treatment have attracted attention as photosensitive materials. Such heat-developable photosensitive materials are described in, for example, Japanese Patent Publication No. 43-4921 and No. 43-4924, which disclose photosensitive materials comprising an organic silver salt, silver halide, a reducing agent, and a binder. It is commercialized by 3M as dry silver. Attempts have been made to improve such heat-developable photosensitive materials and obtain color images by various methods. For example, in the specifications of US Pat. No. 3,531,286, US Pat. No. 3,761,270 and US Pat.
A method for forming a dye image by reaction of an oxidized form of a grade amine developing agent with a coupler, Research Disclosure 15108
and a reducing agent which is a sulfonamide phenol or sulfonamide aniline derivative described in U.S. Pat.
British Patent No.
1590956, a method of releasing a dye image on a separately provided image-receiving layer by using an organic imino silver salt having a dye part and releasing the dye in a heat development part, and JP-A-52-105821 No. 52-105822
No. 56-50328, U.S. Pat. No. 4,235,957, and other methods for obtaining positive dye images by the silver dye bleaching method, as well as U.S. Pat.
Various methods have been proposed, such as methods for obtaining dye images using leuco dyes disclosed in Japanese Patent Application Laid-open No. 3985565, No. 4022617, No. 4452883, and Japanese Patent Application Laid-Open No. 59-206831. However, with these proposals regarding the heat-developable color photosensitive materials, it is difficult to bleach and fix the black, white, and silver images formed at the same time, and
It is difficult to obtain clear color images,
Furthermore, it required complicated post-processing, and was not yet satisfactory for practical use. In recent years, as a new type of color image forming method using heat development, Japanese Patent Laid-Open Nos. 57-179840 and 57-
No. 186744, No. 57-198458, No. 57-207250, etc. disclose methods for obtaining color images by transferring diffusible dyes released by heat development. These methods were further improved to produce diffusible dyes by oxidizing non-diffusible reducing dye-donating substances, such as those disclosed in JP-A-58-58543 and JP-A-59-168439. A method of emitting
JP-A No. 58-79247, No. 59-174834, No. 59-
12431, No. 59-159159, No. 60-2950, etc., in which a diffusible dye is released by coupling with an oxidized developing agent; No. 58-149047, 59
−124339, No. 59-181345, No. 60-2950, Patent Application No. 59-181604, No. 59-182506, No. 59-
A method using a non-diffusible compound that reacts with an oxidized developing agent to form a diffusible dye as disclosed in No. 182507, No. 59-272335, etc.;
JP-A No. 59-152440, No. 59-124327, No. 59-
No. 154445, No. 59-166954, etc., are non-diffusible reducing dye-donating substances that lose their ability to release diffusible dyes when oxidized, and conversely, non-diffusible dye-donating substances that release diffusible dyes when reduced. Some methods have been proposed, such as a method containing a pigment-providing substance. The basic composition of a color type heat-developable photosensitive material that produces a color image using these emitted or formed diffusive dyes consists of a light-sensitive element and an image-receiving element. It consists of a silver salt, a reducing agent, a dye-providing substance, and a binder. In the present invention, only the photosensitive element is referred to as a heat-developable photosensitive material in a narrow sense, and the image receiving element is referred to as an image receiving member. The above heat-developable photosensitive material is one in which a dye image is obtained by transferring the released or formed diffusible dye onto an image receiving layer of an image receiving member provided on the same support or another independent support. , image sharpness,
In terms of stability and other aspects, it has been improved in many respects compared to previous heat-developable color photosensitive materials. Incidentally, in these heat-developable photosensitive materials, it is preferable to provide a non-photosensitive layer (hereinafter referred to as a protective layer) for the purpose of protecting the photosensitive layer, but if the film adhesion between the protective layer and the photosensitive layer is poor, , the protective layer may peel off from the photosensitive layer during heat development, and especially in diffusion transfer type heat-developable photosensitive materials, the protective layer may adhere to the image-receiving material during heat development, causing stains on the transferred image, or Since the releasability of the image-receiving material and the photosensitive material is poor, undesirable compounds in the photosensitive material are transferred to the image-receiving material, resulting in image staining. Furthermore, this poor film adhesion tended to become particularly noticeable when a hot solvent was added to the photosensitive layer in order to improve developability and the like. [Object of the Invention] An object of the present invention is to provide a heat-developable color photosensitive material with improved film adhesion between a photosensitive layer and a protective layer. Another object of the present invention is to provide a diffusion transfer type heat-developable color photosensitive material with improved peelability between an image receiving member and the photosensitive material. [Structure of the Invention] As a result of intensive studies to achieve the above object, the present inventors have created a photographic constituent layer consisting of at least one heat-developable photosensitive layer and at least one non-photosensitive layer on a support. The heat-developable color photosensitive material has at least one non-photosensitive protective layer on the side opposite to the support of the heat-developable photosensitive layer furthest from the support, and at least one of the non-photosensitive protective layers
It has been found that the above objects of the present invention can be achieved by providing a heat-developable color photosensitive material containing oil droplets in the layer. [Specific Structure of the Invention] The heat-developable color photosensitive material according to the present invention has at least one non-photosensitive protective layer (hereinafter referred to as a protective layer) on the opposite side of the heat-developable photosensitive layer furthest from the support. At least one of the protective layers contains oil droplets. For example, when the protective layer has two or more layers, at least the outermost layer, that is, the protective layer furthest from the support. In view of the effects of the present invention, it is particularly preferable that the layer contains oil droplets. In the present invention, oil droplets refer to substantially water-insoluble droplet particles that are finely dispersed in a binder as an oily independent system. The size of oil droplets is generally 0.01 to 10μ, for example, but in the present invention,
Typical average particle sizes are 0.1-10μ. For example, US Pat. No. 2,322,027,
Organic high-boiling point compounds used for dispersing ordinary photographic couplers described in the specifications of 2801170, 2801171, 2272191, and 2304940, U.S. Pat. So-called lubricants such as higher alkyl sodium sulfate, esters of higher fatty acids and higher alcohols (so-called waxes), high molecular weight polyethylene glycol, higher alkyl phosphate esters, and silicone compounds as described in the specifications of No. 141623/1983 etc. can be mentioned. In addition, in the present invention, although it is solid at room temperature,
Compounds that become liquid when added to the binder layer or when mixed with various photographic additives are used as oil droplets, and compounds used for this type of oil droplets include compounds with a melting point of 50°C or less. Things are common. The compounds that can form oil droplets used in the present invention are typically those with a boiling point of 180°C or higher at normal pressure, and specific examples of these include diethyl adipate, dibutyl adipate, diisobutyl adipate, di-n -Hexyl adipate, dioctyl adipate, dicyclohexyl acelate, di-2-ethylhexyl azelate, dioctyl sebacate, diisoctyl sebacate, dibutyl succinate, octyl stearate, dibenzyl phthalate, tri-o-cresyl phosphate , diphenyl-mono-p-tert-butylphenyl phosphate, monophenyl-di-o-chlorophenyl phosphate, monobutyl-dioctyl phosphate, 2,4-di-n-aluminumphenol, 2,4-di-tert -amylphenol, 4-
n-nonylphenol, 2-methyl-4-n-octylphenol N,N-diethylcaprylamide, N,N-diethyllauramide, glycerol triaropionate, glycerol tributyrate, glycerol monolactate diacetate, tributyl citrate Acetyl triethyl citrate, di-2-ethylhexyl adipate, dioctyl sebacate, di-isooctyl azelate, diethylene glycol dibenzoate, dipropylene glycol dibenzoate, triethyl citrate, tri(2-ethylhexyl) citrate, acetyl Tri-n-butyl citrate, di(isotesyl) 4,5-epoxytetrahydrophthalate, oligovinylethyl ether, dibutyl fumarate, polyethylene oxide (n>16), glycerol tributyrate, ethylene glycol diprorohyonate, (2-
ethylhexyl) isophthalate, butyl laurate, tri-(2-ethylhexyl) phosphate, triphenyl phosphate, tricresyl phosphate, silicone oil, dimethyl phthalate, diethyl phthalate, dipropyl phthalate, dibutyl phthalate, diisooctyl Phthalate, di-amyl phthalate, di-n-octyl phthalate, diamylnaphthalene, triamylnaphthalene, monogabulin, monolaurin, monomyristin, monopalmitin, monostearin, monoolein, dicaprin, dilaurin, diminostin, dipalmitin, distearin, diolein , 1-stearo-2-palmitin, 1-palmito-3-stearin, 1-palmito-2-stearin, triacetin, tricaprin, trilaurin, trimyristin, tripalmitin, tristearin, triolein, tripetroserin, triergin, Triricinolein, linoleodistearin, linoleodilinolenin, orange erucin, linoleodiersin, palmitooleolinoninin, paraffin, linseed oil, soybean oil, eno oil,
Drying oils such as tung oil, hemp oil, kaya oil, walnut oil, mustard oil, poppy oil, sunflower oil, catalpa oil, mulberry oil, safflower oil; cottonseed oil, corn oil, sesame oil, rapeseed oil, rice bran oil, Semi-drying oils such as lotus oil, mustard oil, kaboku oil, dehydrated castor oil;
peanut oil, olive oil, shibaki oil, sasanquat oil,
Examples include tea oil, castor oil, hydrogenated castor oil, almont oil, linseed oil, pen oil, and fenugreek oil. Also, general formula

[ka] Or general formula

A compound represented by the formula (wherein R is a carbon atom of 1 to 8
can also be used as organic high-boiling compounds in the present invention. Others: JP-A-50-238235, JP-A No. 50-62632,
Compounds other than those listed above as described in No. 51-26035, No. 51-26036, No. 51-26037, etc. can also be used in the same manner. Among these, glutaric acid, adipic acid,
Phthalic acid, sebacic acid, succinic acid, maleic acid,
Esters such as fumaric acid, mazelaic acid, isophthalic acid, terephthalic acid, and phosphoric acid, esters of glycerin, paraffin, and fluorinated paraffin have no adverse effect on photosensitive materials and are easily available;
It can be conveniently used because it is scientifically stable and easy to handle, but in addition, tricresyl phosphate, triphenyl phosphate, dibutyl phthalate, di-n-octyl phthalate,
Di-2-ethylhexyl phthalate, glycerol tributyrate, glycerol tripropionate, dioctyl sebacate, paraffin, fluorinated paraffin, and silicone oil are particularly preferred organic high-boiling compounds in the present invention. In the present invention, any known method can be used to form oil droplets, but a typical method is, for example, to form oil droplets using one or more of the above-mentioned organic high-boiling compounds, etc. If necessary, the compound is dissolved with photographic additives as described below, and if necessary, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, butyl propionate, cyclohexanol, diethylene glycol monoacetate, nitromethane, carbon tetrachloride. ,
Dissolve in a low boiling point solvent such as chloroform, cyclohexanetetrahydrofuran, methyl alcohol, ethyl alcohol, propyl alcohol, fluorinated alcohol, acetonitrile, dimethylformamide, dioxane, acetone, methyl ethyl ketone, methyl isobutyl ketone (low boiling point solvents should not be used alone). may also be used in admixture), anionic surfactants such as alkylbenzenesulfonic acids and alkylnaphthalenesulfonic acids, and/or
Alternatively, the mixture is mixed with an aqueous solution of a hydrophilic binder such as gelatin containing a nonionic surfactant such as sorbitan sesquioleate and sorbitan monolaurate, and emulsified and dispersed using a high-speed rotary mixer, colloid mill, or ultrasonic dispersion device. The resulting dispersion is added to a coating solution containing a hydrophilic colloid binder, and coated onto a support via a silver halide emulsion if necessary. Also, a compound that causes the formation of certain oil droplets may be dissolved, for example, in the above-mentioned low-boiling organic solvent, and the solution may be added directly to the photographic coating solution. The low boiling point organic solvent used at this time evaporates after coating and drying, and almost no longer exists in the binder. In the present invention, the oil droplets may contain various photographic additives. This photographic additive is
Any additives such as hydrophilic ones and lipophilic ones can be used, but lipophilic additives are preferable. Particularly preferable additives include stain preventive additives such as ultraviolet absorbers and hydroquinone derivatives. agents, antioxidants, etc. Examples of ultraviolet absorbers that can be contained in oil droplets in the present invention include US Pat.
No. 3253921, No. 3004896, No. 3267113, No. 3692525, British Patent No. 980886, No. 1239258
No. 1256025, Belgian Patent No. 623419,
No. 625007, No. 670016, German Patent No.
Benzotriazoles as described in U.S. Patent No. 2151098, U.S. Pat.
No. 2798067, No. 2875053, No. 3352681, No. 2739888, No. 2719162, No. 2808380,
Thiazolidones as described in the same No. 3365295, JP-A-47-10537, JP-A-48-30492
No. 49-43888, No. 48-31255, No. 48-
35376, acrylonitriles such as those described in Belgian patent no. 835511, British patent no.
Benzophenones such as those described in British Patent No. 1321355 and British Patent No. 3215530, as well as U.S. Patent No.
No. 3271156, No. 2748021, No. 2685512, No. 2763566, No. 2632701, West German Patent No.
Ultraviolet absorbers such as those described in US Pat. No. 1,023,859 can be used. In the present invention, hydroquinone derivatives can usually be used as the stain inhibitor contained in the oil droplets. Hydroquinone derivatives have a hydroquinone nucleus, and one hydrogen atom on the hydroquinone nucleus is an alkyl group (e.g., methyl, trrt-butyl, octyl, tert-octyl, dodecyl, octadecyl, etc.); an aryl group (e.g., phenyl, etc.); ); alkoxy groups (e.g. methoxy, butoxy, dodecyloxy, etc.); aryloxy (e.g. phenoxy, etc.); carbamoyl groups (e.g. methylcarbamoyl, dibutylcarbamoyl, octadecylcarbamoyl, phenylcarbamoyl, etc.); sulfamoyl groups (e.g. methylsulfamoyl, octadecylsulfamoyl, etc.); acyl groups (e.g. acetyl, butyroyl, octanoyl, lauroyl, etc.); alkoxycarbonyl groups (e.g. methoxycarbonyl,
dodecyloxycarbonyl, etc.); and aryloxycarbonyl groups (eg, phenyloxycarbonyl, etc.). The alkyl and aryl in the above groups are halogen atoms, alkyl groups, aryl groups, alkoxy groups, aryloxy groups, carboxyl groups, alkoxycarbonyl groups, acyl groups, acyloxy groups, carbamoyl groups, sulfo groups, sulfamoyl groups, and sulfonamide groups. , an N-alkylamino group, an N-arylamino group, an acylamino group, an imide group, a hydroxy group, and the like. In the present invention, among the above-mentioned hydroquinone derivatives, those in which the total number of carbon atoms contained in the substituents on the hydroquinone nucleus is 8 or more are preferable, and the substituents on the nucleus are an alkyl group (which may have a substituent). ) is particularly preferred. Specific examples of the hydroquinone derivatives used in the present invention include, for example, US Pat.
No. 2384458, No. 2403721, No. 2418613,
Same No. 6675314, No. 2701197, No. 2704713, Same No.
No. 2710801, No. 2722556, No. 2728659, No.
No. 2732300, No. 2735765, No. 2816028, No. 2732300, No. 2735765, No. 2816028, No.
3062884, 3236893, British Patent No. 557750,
No. 557802, West German Published Patent No. 2149789, Special Publication No. 1977-
No. 54116, JP-A-46-2128, Journal of Organic Chemistry, Volume 22, No.
Paragraphs 772-774 (Journal of organic chemistry)
etc. are listed. The oil droplets in the present invention are obtained by separately preparing oil droplets consisting only of oil droplet-forming compounds such as organic high-boiling compounds and oil droplets consisting of the above-mentioned lipophilic photographic additive, and adding them to the binder coating solution. A protective layer may also be applied. Further, the oil droplets may be formed simultaneously using two or more types of organic high boiling point compounds,
It may be a mixture of separately emulsified and dispersed materials. Regarding the surfactant used for dispersing oil droplets in the present invention, Japanese Patent Publication Nos. 48-9979 and 1973-
134428, JP-A No. 51-3219, JP-A No. 51-32322,
U.S. Patent No. 2240472, U.S. Patent No. 2271623, U.S. Patent No. 2288226
No. 2311021, No. 2322027, No. 2360289,
Same No. 2533514, No. 2739891, No. 2801170, Same No.
No. 2801171, No. 2852382, No. 2949360, No.
No. 3068101, No. 3153484, No. 3201253, No.
No. 3210191, No. 3294540, No. 3396027, No.
No. 3415649, No. 3441413, No. 3442654, No. 3441413, No. 3442654, No.
No. 3475174, No. 3545974, No. 3619195, No. 3619195, No.
No. 3775349, West German published patent (OLS) No. 1942665,
German patent no. 1443707, no. 2045414, no.
No. 2043271, No. 2045464, British Patent No. 1077317,
There is also a detailed description in 1198450 etc. One or more desired ones can be selected from these.
The amount of these surfactants can be changed arbitrarily, but it may be used at least to the extent necessary to substantially obtain an emulsifier. The oil droplet density (the ratio of the layer volume of oil droplets added to the protective layer to the total binder volume of the protective layer) in the present invention is preferably 0.05 to 0.5, more preferably
It is 0.7-0.4. Various additives used in the photographic field can be used in the protective layer of the present invention. Such additives include various matting agents, colloidal silica, slipping agents, organic fluoro compounds (especially fluorine surfactants), antistatic agents, polymer latex, surfactants (including polymeric surfactants). , hardeners (including polymer hardeners), organic silver salt particles, non-photosensitive silver halide particles, and the like. The matting agent used in the protective layer of the present invention is fine particles of inorganic or organic substances that are incorporated into a heat-developable photosensitive material to increase the roughness of the surface of the photosensitive material and make it matte. be. A method of using a matting agent to prevent adhesion that occurs during the production, storage, and use of photosensitive materials, and to prevent charging that occurs due to contact, friction, and peeling between materials of the same or different types is as follows: Well known in the industry. As a specific example of a matte agent, JP-A-Sho
Silicon dioxide described in No. 50-46316, JP-A-53-
Alkali-soluble matting agents such as alkyl methacrylate/methacrylic acid copolymers described in No. 7231, No. 58-66937, and No. 60-8894; alkalis having anionic groups described in JP-A-58-166341; Soluble polymer, combination of two or more types of fine particle powders with different Mohs hardnesses, as described in JP-A-58-145935, JP-A-58-145935
Combination of oil droplets and fine particle powder described in No. 147734, JP-A-Sho
59-149356, a combination of two or more spherical matting agents having different average particle diameters, a combination of a roughening surfactant and a matting agent described in JP-A-56-44411, and British Patent No. 1055713, British Patent No. 1939213, same
No. 2221873, No. 2268662, No. 2322037, No. 2221873, No. 2268662, No. 2322037, No.
No. 2376005, No. 2391181, No. 2701245, No. 2376005, No. 2391181, No. 2701245, No.
No. 2992101, No. 3079257, No. 3262782, No.
No. 3443946, No. 3516832, No. 3539344, No. 3539344, No. 3516832, No. 3539344, No.
No. 3591379, No. 3754924, No. 3767448, JP-A-Sho
Organic matting agents described in No. 49-106821, No. 57-14835, etc., West German Patent No. 2529321, British Patent No. 760775, No. 1260772, U.S. Patent No. 1201905
No. 2192241, No. 3053662, No. 3062649,
Same No. 3257206, No. 3322555, No. 3353958, Same No.
No. 3370951, No. 3411907, No. 3437484, No.
No. 3523022, No. 3615554, No. 3635714, No. 3635714, No. 3615554, No. 3635714, No.
Inorganic matting agents described in No. 3769020, No. 4021245, No. 4029504, etc., or JP-A-46-
No. 7781, No. 49-106821, No. 51-6017, No. 53-
No. 116143, No. 53-100226, No. 57-14835, No.
No. 57-82832, No. 53-70426, No. 59-149357,
Matting agents having physical properties as described in Japanese Patent Publication No. 57-9053 and EP-107378 are preferably used. In the protective layer of the present invention, the amount of the matting agent added is preferably 10 mg/2.0 g per m ² , more preferably 20 mg to 1.0 g. The particle size of the matte agent is 0.5~
The thickness is preferably 10 μm, more preferably 1.0 to 6 μm. The matting agent may be used in combination of two or more types. Slip agents used in the protective layer of the present invention include solid paraffin, oils and fats, surfactants, natural waxes, synthetic waxes, etc. Specifically, examples include French Patent No. 2180465 and British Patent No.
No.955061, No.1143118, No.1270578, No.955061, No.1143118, No.1270578, No.
No. 1320564, No. 1320757, JP-A-49-5017, No.
No. 51-141623, No. 54-159221, No. 56-81841,
Research Disclosure
Disclosure) No. 13969, U.S. Patent No. 1263722,
No. 2588765, No. 2739891, No. 3018178, No.
No. 3042522, No. 3080317, No. 3082087, No.
No. 3121060, No. 3222178, No. 3295979, No.
No. 3489567, No. 3516832, No. 3658573, No.
Those described in No. 3679411, No. 3870521, etc. can be preferably used. Binders used in the protective layer of the present invention include polyvinyl butyral, polyvinyl acetate, ethylcellulose, polymethyl methacrylate, cellulose acetate butyrate, polyvinyl alcohol, polyvinylpyrrolidone, polyethyloxazoline, polyacrylamide, gelatin, and phthalated gelatin. One or a combination of two or more synthetic or natural polymeric substances can be used. In particular, gelatin (including gelatin derivatives), polyvinylpyrrolidone (preferably molecular weight 1000-400000), polyvinyl alcohol (molecular weight 1000-400000),
100,000) and polyoxazoline (molecular weight is preferably 1,000 to 800,000) alone or in combination of two or more of these binders are preferred, and gelatin alone or gelatin is compatible with gelatin such as the above-mentioned polyvinylpyrrolidone, polyvinyl alcohol, and polyoxazoline. Particularly preferred is a binder in which a hydrophilic polymer of good quality is used in combination. Gelatin may be treated with lime, acid, or ion exchange, and may be ossein gelatin, pitguskin gelatin, hydrogelatin, or modified gelatin made by esterifying, phenylcarbamoylating, etc. good. The thickness of the protective phase of the present invention is preferably 0.05 to 5 μm, more preferably 0.1 to 1.0 μm. The protective 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. By using it in the protective layer, only the degree of hardness of the protective layer can be made greater than that of the photosensitive layer. Polymer hardeners are known as diffusion-resistant hardeners, such as those disclosed in US Pat. No. 3,057,723, US Pat.
Hardeners described in JP-A No. 4161407, JP-A No. 58-50528, etc. can be used. Another way to control the degree of hardening for each layer is to include a diffusible hardener (for example, a vinyl sulfone hardener) only in the protective layer, or to make the content of the protective layer higher than that of the photosensitive layer. The degree of hardness of the protective layer can be made higher than that of the photosensitive layer by quickly drying the protective layer after simultaneous multi-layer coating. The heat-developable photosensitive material of the present invention basically includes (1) photosensitive silver halide, (2) in one heat-developable photosensitive layer.
It is preferable to contain a reducing agent, (3) a dye-providing substance, (4) a binder, and further contain (5) an organic silver salt if 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 above (1), (2), (4),
The component (5) is contained in the heat-developable photosensitive layer on one side,
The dye-providing substance (3) may be contained separately in two or more constituent layers as long as they can react with each other, such as by containing the dye-providing substance (3) in the layer on the other side adjacent to this photosensitive layer. In addition, the heat-developable photosensitive layer is divided into a high-sensitivity layer and a low-sensitivity layer.
It may be divided into two or more layers such as a high concentration layer and a low concentration layer. 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 each photosensitive layer forms or releases dyes with different hues upon 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. There are configurations such as a structure in which a green-sensitive layer, a red-sensitive layer is formed, or a structure in which a green-sensitive layer, a red-sensitive layer, and a blue-sensitive layer are sequentially formed on a support. In addition to the heat-developable photosensitive layer, the photothermographic 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. That is, there are methods and apparatuses for the dip method, roller method, reverse roll method, air knife method, doctor blade method, spray method, bead method, extrusion method, stretch flow method, curtain method, and the like. Examples of the photosensitive silver halide used in the present invention include silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodide, silver iodobromide, and silver chloroiodobromide. The photosensitive silver halide can be prepared by any method used in the photographic field, such as a single jet method or a double jet method. For example, JP-A-54-48521
By applying the method described in the above publication, monodisperse silver halide grains can be obtained by a double jet method while keeping pAg constant. At that time, a highly monodisperse silver halide emulsion can be obtained by appropriately selecting the time function of addition rate, PH, pAg, temperature, etc. According to a further preferred embodiment, silver halide emulsions having silver halide grains with shells can be used. Silver halide grains having shells can be obtained by sequentially growing shells on a core of silver halide grains having good monodispersity using the method described above. The monodisperse silver halide emulsion referred to in the present invention is
An emulsion having a particle size distribution in which the variation in size of silver halide grains contained in the emulsion is not more than a certain ratio with respect to the average grain size as shown below.
Since the grain size distribution of an emulsion (hereinafter referred to as a monodisperse emulsion) consisting of a group of photosensitive silver halide grains with a uniform grain morphology and small variation in grain size is almost a normal distribution, the standard deviation can be easily determined. When the width of the distribution is defined by the relational expression standard deviation/average grain size x 100 = width of distribution (%), the width of the distribution of the silver halide grains used in the present invention is 15% or less. The monodispersity is preferably 10% or less, and more preferably 10% or less. Also, for example, JP-A-58-111933, JP-A No. 58-111933;
As described in No. 111934, No. 58-108526, Research Disclosure No. 22534, etc.
A particle that has two parallel crystal planes, each of which has a larger area than other single crystals of the particle, and whose aspect ratio, that is, the ratio of the diameter to the thickness of the particle, is 5: Silver halide emulsions consisting of one or more tabular silver halide grains can also be used. Further, in the present invention, a silver halide emulsion containing internal latent image type silver halide grains whose surfaces have not been fogged in advance can be used. Regarding internal latent image type silver halide whose surface is not fogged in advance, for example, US Pat. No. 2,592,250, US Pat.
No. 3317322, No. 3511662, No. 3447927,
As described in No. 3761266, No. 3703584, No. 3736140, etc., it is a silver halide grain in which the sensitivity inside the grain is higher than the sensitivity on the surface of the grain. The method for producing silver halide emulsions containing these internal latent image type silver halides is as described in the above-mentioned patents, for example, by first preparing AgCl grains,
Next, bromide or a small amount of iodide is added to it to effect halide exchange, or the central core of chemically sensitized silver halide is coated with non-chemically sensitized silver halide. Many methods are known, such as mixing a chemically sensitized coarse grain emulsion with a chemically sensitized or non-chemically sensitized fine grain emulsion and depositing a fine grain emulsion on the coarse grain emulsion. Also, U.S. Patent No. 3,271,157,
Silver halide emulsions having silver halide grains containing multivalent metal ions as described in U.S. Pat. No. 3,447,927 and U.S. Pat. Silver halide emulsions with weakly chemically sensitized silver halide grain surfaces, or silver halide emulsions consisting of grains with a laminated structure described in JP-A-50-8524 and JP-A-50-38525, etc. These include silver halide emulsions described in JP-A-52-156614 and JP-A-55-127549. The light-sensitive silver halide emulsion may be chemically sensitized by any method known in the photographic art. Such sensitization methods include various methods such as gold sensitization, sulfur sensitization, gold-sulfur sensitization, and reduction sensitization. The silver halide in the above-mentioned photosensitive emulsion may be coarse grain or fine grain, but the preferred grain size is about 0.001 μm to about 1.5 μm, more preferably about 0.01 μm to about 1.5 μm. It is approximately 0.5 μm. The photosensitive silver halide emulsion prepared as described above can most preferably be applied to the heat-developable photosensitive layer which is a constituent layer of the photosensitive material of the present invention. In the present invention, as another method for preparing photosensitive silver halide, it is also possible to allow a photosensitive silver salt-forming component to coexist with an organic silver salt described below to form photosensitive silver halide in a part of the organic silver salt. . The photosensitive silver salt-forming component used in this preparation method is an inorganic halide, for example, a halide represented by MXn (where M represents an H atom, an _NH4 group, or a metal atom, and X represents Cl, Br). or represents I,
n indicates 1 when M is an H atom or an NH ₄ group, and indicates the valence when M is a metal atom. As a metal atom,
Lithium, sodium, potassium, rubidium,
cesium, copper, gold, beryllium, magnesium,
Calcium, strontium, barium, zinc,
cadmium, mercury, aluminum, indium,
Lanthanum, ruthenium, thallium, germanium, tin, lead, antimony, bismuth, chromium, molybdenum, tungsten, manganese, rhenium,
Examples include iron, cobalt, nickel, rhodium, palladium, osmium, iridium, platinum, and cerium. ), halogen-containing metal complexes (e.g.
K ₂ PtCl ₆ , K ₂ PtBr ₆ , HAuCl ₄ , (NH ₄ ) ₂ IrCl ₆ ,
(NH ₄ ) ₃ IrCl ₆ , (NH ₄ ) ₂ RuCl ₆ , (NH ₄ ) ₃ RuCl ₆ ,
(NH ₄ ) ₂ RhCl ₆ , (NH ₄ ) ₃ RhBr ₆ , etc.), onium halides (e.g., tetramethylammonium bromide, trimethylphenylammonium bromide, cetylethyldimethylammonium bromide, 3-methylthiazolium bromide, trimethylbenzyl quaternary ammonium halides such as ammonium bromide, quaternary phosphonium halides such as tetraethyl phosphonium bromide, tertiary sulfonium halides such as benzylethylmethylsulfonium bromide, 1-ethylthiazolium bromide, etc.), halogenation Hydrocarbons (e.g. iodoform, bromoform, carbon tetrabromide, 2-bromo-2-methylpropane, etc.), N-halogen compounds (N-chlorosuccinimide, N-bromosuccinimide, N-
Bromophthalic acid imide, N-bromoacetamide, N-iodosuccinimide, N-bromophthalazinone, N-chlorophthalazinone, N-bromoacetanilide, N,N-dibromobenzenesulfonamide, N-bromo-N-methylbenzene sulfonamide, 1,3-dibromo-4,4-dimethylhydantoin, etc.), and other halogen-containing compounds (e.g., triphenylmethyl chloride, triphenylmethyl bromide, 2-bromobutyric acid, 2-bromoethanol, etc.). be able to. These photosensitive silver halides and photosensitive silver salt-forming components can be used in combination in various methods, and the amounts used are as ^follows :
The amount is preferably 0.001 g to 50 g, more preferably 0.1 g to 10 g. The heat-developable photosensitive material of the present invention has blue light, green light,
It is also possible to have a multilayer structure including each layer having sensitivity to red light, that is, a heat-developable blue-sensitive layer, a heat-developable green-sensitive layer, and a heat-developable red-sensitive layer. Further, the same color photosensitive layer can be divided into two or more layers (for example, a high-sensitivity layer and a low-sensitivity layer). In the above cases, the blue-sensitive silver halide emulsion, green-sensitive silver halide emulsion, and red-sensitive silver halide emulsion used, respectively, are prepared by adding various spectral sensitizing dyes to the silver halide emulsion. Obtainable. 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 the cyanine pigments, thiazoline, oxazoline, pyrroline, pyridine, oxazole, thiazole, selenazole,
Those having a basic core such as imidazole are more preferred. Such a nucleus may contain an alkyl group, an alkylene group, 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. good. Further, it may be symmetrical or asymmetrical, and the methine chain or polymethine chain may have an alkyl group, phenyl group, enamine group, or heterocyclic substituent. In addition to the above-mentioned basic nucleus, merocyanine dyes include, for example, thiohydantoin nucleus, rhodanine nucleus, oxazolidione nucleus, thiazolidinedione nucleus, barbituric acid, thiazolinthione nucleus, malononitrile nucleus,
It may have an acidic nucleus such as a 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, supersensitizing additives that do not absorb visible light such as ascorbic acid derivatives, azaindene cadmium salts, organic sulfonic acids, etc., such as those described in the specifications of U.S. Pat. No. 2,933,390 and U.S. Pat. be able to. The amount of these sensitizing dyes added is 1×10 ^-4 per mole of photosensitive silver halide or silver halide forming component.
mol to 1 mol. More preferably, 1×10 ⁻⁴
mole to 1×10 ⁻¹ mole. In the heat-developable photosensitive material of the present invention, various organic silver salts can be used, if necessary, for the purpose of increasing sensitivity and improving developability. Examples of organic silver salts used in the heat-developable photosensitive material of the present invention include Japanese Patent Publication No. 43-4921 and Japanese Patent Application Laid-Open No. 49-52626.
No. 52-141222, No. 53-36224 and No. 53
Publications such as −37610 and U.S. Patent No. 3330633
Silver salts of long-chain aliphatic carboxylic acids and silver salts of carboxylic acids having a heterocycle as described in the specifications of No. 3794496, No. 4105451, etc.
For example, silver laurate, silver myristate, silver palmitate, silver stearate, silver arachidonate, silver behenate, α-(1-phenyltetrazolthio)
Silver directional group carboxylates such as silver acetate, such as silver benzoate, silver phthalate, etc.,
No. 45-12700, No. 45-18416, No. 45-22185,
JP-A-52-137321, JP-A-58-118638, JP-A-58
There are silver salts of imino groups described in publications such as No. 118639 and US Pat. No. 4,123,274. Examples of silver salts of imino groups include benztriazole silver. The benztriazole silver may be substituted or unsubstituted. Representative examples of substituted benztriazole silver include:
For example, alkyl-substituted benztriazole silver (preferably substituted with a _C22 or less alkyl group, more preferably a _C4 or less alkyl group, such as methylbenztriazole silver, ethylbenztriazole silver, n-octylbenztriazole silver, etc.) ), silver alkylamidobenztriazole (preferably substituted with an alkylamide group of up to _C22 , e.g. silver acetamidobenztriazole, silver propionamidobenztriazole, silver isobutylamidobenztriazole,
silver laurylamide benztriazole, etc.), silver alkylsulfamoylbenztriazole (preferably substituted with an alkylsulfamoyl group of C ₂₂ or less, for example, silver 4-(N,N-diethylsulfamoyl)benztriazole) , 4-
(N-propylsulfamoyl)benztriazole silver, 4-(N-octylsulfamoyl)benztriazole silver, 4-(N-decylsulfamoyl)benztriazole silver, 5-(N-octylsulfamoyl) benztriazole silver, etc.),
Silver salts of halogen-substituted benztriazoles (for example, silver 5-chlorobenztriazole, silver 5-bromobenztriazole, etc.), silver alkoxybenztriazole (preferably an alkoxy group of C ₂₂ or less, more preferably an alkoxy group of C ₄ or less) silver 5-nitrobenztriazole, silver 5-aminobenztriazole, silver 4-hydroxybenztriazole, silver 5-carboxybenztriazole, 4-Sulfobenztriazole silver, 5
-sulfobenztriazole silver and the like. Examples of other silver salts having an imino group include imidazole silver, benzimidazole silver, 6
- nitrobenzimidazole silver, pyrazole silver,
urazole silver, 1,2,4-triazole silver,
1H-tetrazole silver, 3-amino-5-benzylthio-1,2,4-triazole silver, satucalin silver, phthalazinone silver, phthalimide silver, etc., and other silver salts of methylcapto compounds, such as 2-mercaptobenzoxazole silver, mercaptooxadi Azole silver, 2-mercaptobenzothiazole silver, 2-mercaptobenzimidazole silver, 3-
Mercapto-4-phenyl-1,2,4-triazole silver, 4-hydroxy-6-methyl-1,
Examples include 3,3a,7-tetrazaindene silver and 5-methyl-7-hydroxy-1,2,3,4,6-pentazaindene silver. In addition, silver complex compounds with a stability constant of 4.5 to 10.0 as described in JP-A No. 52-31728, imidazolinthion silver salts as described in U.S. Pat. No. 4,168,980, etc. are used. . Among the above organic silver salts, imino group silver salts are preferable, particularly silver salts of benzotriazole derivatives,
More preferred are 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, a silver salt may be prepared in a suitable binder and used as it is without isolation, or the isolated 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, vibration mills, and the like. 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. Adding alkali to promote the dissolution of organic compounds,
It is also effective to use an ammoniacal silver nitrate solution. The amount of the organic silver salt used is generally preferably 0.01 to 500 mol, more preferably 0.1 to 100 mol, per 1 mol of photosensitive silver halide. Further, the amount is more preferably 0.3 to 30 mol. 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, JP-A-57-186744;
No. 58-79247, No. 58-149046, No. 58-149047
No. 59-124339, No. 59-181345, No. 60-
In the case of a dye-donating substance that releases or forms a diffusible dye by coupling with an oxidized form of a reducing agent as disclosed in No. 2950, etc., the reducing agent used in the present invention may be , for example, US Patent No. 3531286, US Patent No. 3761270, US Patent No.
3764328 specifications, RD No. 12146, and the same No.
15108, No. 15127 and JP-A-56-27132, p-phenylenediamine type and p-aminophenol type developing agents, phosfluoramide phenol type, sulfonamide phenol type developing agents, sulfonamide aniline type developing agents A developing agent, a hydrazone color developing agent, etc. can be used. Also, U.S. Patent No. 3342599, U.S. Patent No. 3719492
Color developing agent precursors described in Japanese Patent Application Laid-Open Nos. 53-135628 and 54-79035 can also be advantageously used. As a particularly preferable reducing agent, JP-A-56-146133
Examples include reducing agents represented by the following general formula (1) described in No. General formula (1)

[Formula] In the formula, R ¹ and R ² are a hydrogen atom or a carbon atom number of 1 to 30 (preferably 1
-4) represents an alkyl group, and R ¹ and R ² may be ring-closed to form a heterocycle. R ³ , R ⁴ , R ⁵ and R ⁶ are hydrogen atoms, halogen atoms, hydroxy groups,
Represents an amino group, an alkoxy group, an acylamido group, a sulfonamide group, an alkylsulfonamide group, or an alkyl group having 1 to 30 carbon atoms (preferably 1 to 4) that may have a substituent, and R ³ and R ¹ And R ⁵ and R ² may each be ring-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 above general formula (1) is an organic compound containing a nitrogen atom that exhibits basicity capable of forming an inorganic salt and a salt, and particularly important organic bases include amine compounds. Examples of chain amine compounds include primary amines, secondary amines, and tertiary amines, and examples of cyclic amine compounds include typical heterocyclic organic bases and the famous pyridine, quinoline, and piperidine. , imidazole and the like. In addition, compounds such as hydroxylamine, 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, examples of the compound containing quaternary nitrogen in the above general formula include salts or hydroxides of nitrogen compounds having a tetravalent covalent bond. Next, preferred specific examples of the reducing agent represented by the general formula (1) are shown below.

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[Chemical formula] The reducing agent represented by the above general formula (1) can be prepared by a known method such as Heuben-Beil, Methods der Organitsien Chemie, Band XI/2.
(Houben-Weyl, Methoden der Organischen
It can be synthesized according to the method described in Chemie, BandXI/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. Moreover, the dye-donating substance used in the present invention is
-152440, 59-154445, etc., compounds that release dyes upon oxidation, compounds that lose their ability to release dyes when oxidized, compounds that release dyes when reduced, etc. (or If only a silver image is to be obtained), current active agents such as those described below can also be used. For example, phenols (e.g. p-phenylphenol, p-methoxyphenol, 2,6-di-tert-butyl-p-cresol, N-methyl-
p-aminophenol, etc.), sulfonamidophenols [e.g. 4-benzenesulfonamidophenol, 2-benzenesulfonamidophenol, 2,6-dichloro-4-benzenesulfonamidophenol, 2,6-dibromo-4-(p-aminophenol, etc.) −
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'-dinitro-
2,2'-dihydroxy-1,1'-binaphthyl,
4,4'-dimethoxy-1,1'-dihydroxy-
2,2'-binaphthyl, bis(2-hydroxy-1
-naphthyl)methane, etc.], methylenebisphenols [e.g. 1,1-bis(2-hydroxy-
3,5-dimethylphenyl)-3,5,5-trimethylhexane, 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-tert-butyl-5-methylphenyl) meta,
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
-di-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 in the range of 0.01 to 1500 mol, preferably 0.1 to 200 mol, per 1 mol of photosensitive silver halide. 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 in combination 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 one or two of other monomers copolymerizable with vinylpyrrolidone.
Copolymers with the above (including graft copolymers)
It may be. These polymers can be used regardless of their degree of polymerization. Polyvinylpyrrolidone may be substituted polyvinylpyrrolidone, with preferred polyvinylpyrrolidone having a molecular weight of 1000
~400,000. Other monomers copolymerizable with vinylpyrrolidone include acrylic acid, (meth)acrylic acid esters such as acid methacrylic acid and its alkyl esters, vinyl alcohols, vinyl acetates, vinyl imidazoles, (meth)acrylamides, Examples include vinyl monomers such as vinyl carbinols and vinyl alkyl ethers, but at least
Preferably, 20% (weight %, the same applies hereinafter) is polyvinylpyrrolidone. Preferred examples of such copolymers have a molecular weight of 5,000 to 400,000. Gelatin may be treated with lime or acid, and may be ossein gelatin, pitgskin gelatin, hydrogelatin, or modified gelatin obtained by esterifying or phenylcarbamoylating these gelatins. In the above binder, gelatin preferably accounts for 10 to 90%, more preferably 20 to 60%, and vinylpyrrolidone accounts for 5 to 90%, more preferably 10 to 80% of the total binder amount. %. The binder may contain other polymers, such as a mixture of gelatin and polyvinylpyrrolidone with a molecular weight of 1,000 to 400,000 and one or more other polymers, gelatin and vinylpyrrolidone with a molecular weight of 5,000 to 400,000. A mixture of the polymer and one or more other polymeric substances is preferred. Other polymeric substances used include polyvinyl alcohol,
polyacrylamide, polymethacrylamide, polyvinyl butyral, polyethylene glycol,
Natural substances such as polyethylene glycol esters or cellulose-derived counterparts, proteins, and polysaccharides such as starch and gum acacia may be mentioned. These may be contained in an amount of 0 to 85%, preferably 0 to 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 naturally). The amount of binder used is usually 0.05 g to 50 g per layer per m ² of support, preferably
The amount is 0.1g to 10g. Further, the binder is preferably used in an amount of 0.1 to 10 g, more preferably 0.25 to 4 g, per 1 g of the dye-providing substance. Examples of the support used in the heat-developable photosensitive material of the present invention include polyethylene film, cellulose acetate film, polyethylene terephthalate film, synthetic plastic film such as polyvinyl chloride, photographic base paper, printing paper, baryta paper, and resin coated paper. Examples include paper supports, and supports obtained by coating and curing an electron beam curable resin composition on these supports. When the photothermographic material of the present invention and the photosensitive material are of a transfer type and an image receiving member is used, various heat solvents are preferably added to the photothermographic material and/or the image receiving member. The thermal solvent used in the present invention is a compound that promotes at least one of thermal development and thermal transfer. These compounds are described in, for example, US Pat. No. 3,347,675, US Pat.
No., Research Disclosure No. 17643 (XII),
Examples include polar organic compounds such as those described in Japanese Patent Application Laid-Open No. 59-229556, Japanese Patent Application No. 59-47787, etc. Particularly useful in the present invention include, for example, urea derivatives (e.g. dimethylurea, diethyl urea, phenylurea, etc.), amide derivatives (e.g., acetamide, benzamide, etc.), polyhydric alcohols (e.g., 1,5-pentanediol,
1,6-pentanediol, 1,2-cyclohexanediol, pentaerythritol, trimethylolethane, etc.), or polyethylene glycol. 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. The ratio of
3.0, preferably 0.7 to 2.5, particularly preferably 1.0 to
It is a compound in the range of 2.0, and the solubility in water at room temperature is less than 1. Specific examples of water-insoluble solid thermal solvents are shown below.
Not limited to these.

【table】

【table】

【table】

[Table] 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 heat solvent is not particularly limited, but
There are methods such as pulverizing and dispersing using a ball mill, sand mill, etc., adding after dissolving in an appropriate solvent, and adding as an oil-in-water dispersion after dissolving in a high boiling point solvent. It is preferable to pulverize and disperse the solid particles by, for example, a method such as a method, and add the solid particles while maintaining the shape of the solid particles. 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 water-insoluble heat solvent added is usually 10% to 500% by weight, preferably 50% to 50% by weight of the binder amount.
It is 300% by weight. Note that even if the melting point of the water-insoluble solid thermal solvent of the present invention is higher than the heat development temperature, the melting point will be lowered by being added to the binder.
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. Patent No. 3,438,776, compounds such as polyalkylene glycols described in U.S. Pat. There are non-aqueous polar organic compounds having a melting point of 20°C or higher, such as lactones having -CO-, _-SO2- , and -SO- groups. Furthermore, benzophenone derivatives described in JP-A-49-115540, JP-A-53-24829, JP-A-53-
Phenol derivatives described in No. 60223, JP-A-Sho
Carboxylic acids described in No. 58-118640, JP-A-Sho
Examples include polyhydric alcohols described in No. 58-198038 and sulfamoylamide compounds described in JP-A No. 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 coloring agent,
For example, JP-A No. 46-4928, No. 46-6077, No. 49-
No. 5019, No. 49-5020, No. 49-91215, No. 49-
No. 107727, No. 50-2524, No. 50-67132, No. 50
−67641, No. 50-114217, No. 52-33722, No.
No. 52-99813, No. 53-1020, No. 53-55115, No. 53-55115, No.
No. 53-76020, No. 53-125014, No. 54-156523,
No. 54-156524, No. 54-156525, No. 54-156526
No. 55-4060, No. 55-4061, No. 55-32015
Publications such as No. 2140406 and West German Patent No. 2140406,
No. 2141063, No. 2220618, U.S. Patent No. 3847612,
No. 3782941, No. 4201582 and JP-A-57-
No. 207244, No. 57-207245, No. 58-189628, No. 58-189628, No.
Phthalazinone, phthalimide, pyrazolone, quinazonone, N-hydroxynaphthalimide, benzoxazine, naphthoxazinedione, 2,3-dihydro-phthalazinedione, 2,
3-dihydro-1,3-oxazine-2,4-dione, oxypyridine, aminopyridine, hydroxyquinoline, aminoquinoline, isocarbostyryl, sulfonamide, 2H-1,3-benzothiazine-2,4-(3H) dione, benzotriazine, mercaptotriazole, dimethicaptotetrazapentalene, aminomercaptriazole,
Acylaminomercaptotriazoles, phthalic acid, naphthalic acid, phthalamic acid, etc.; a mixture of one or more of these with an imidazole compound; and at least one acid or acid anhydride such as phthalic acid, naphthalic acid, etc. Examples include mixtures of phthalazine and phthalazine compounds, and combinations of phthalazine and maleic acid, itaconic acid, quinolinic acid, gentisic acid, and the like. As an antifoggant, for example, US Pat.
Higher fatty acids (e.g. behenic acid, stearic acid, etc.) described in Japanese Patent Publication No. 3645739, mercuric salts described in Japanese Patent Publication No. 11113-1983, N-halogen compounds described in Japanese Patent Application Laid-open No. 47419-1983 (e.g. -halogenoacetamide, N-halogenosuccinimide, etc.), mercapto compound-releasing compounds described in U.S. Pat. oxidants (e.g. perchlorates, inorganic oxides, persulfates, etc.), sulfinic acids or thiosulfonic acids described in No. 53-19825, 2-thiouracils described in No. 51-3223, simple sulfur described in No. 51-26019, 51- No. 42529, No. 51-81124, No. 42529, No. 51-81124, No.
Disulfide and polysulfide compounds described in No. 55-93149, rosins or diterpenes (e.g. abietic acid, pimaric acid, etc.) described in No. 51-57435, free carboxy groups or sulfonic acid groups described in No. 51-104338. 1,2,4-triazole or 5-mercapto-1,2,4- as described in JP-A-54-51821 and U.S. Pat. No. 4,137,079; Triazole, 55-
Thiosulfinate esters described in No. 140833,
1,2,3,4-thiatriazoles described in No. 55-142331, No. 59-46641, No. 59-57233,
Examples include dihalogen compounds or trihalogen compounds described in No. 59-57234, and thiol compounds described in No. 59-111636. In addition, as other anti-fogging agents,
Hydroquinone derivatives described in No. 56506 (e.g.
di-t-octylhydroquinone, dodecanylhydroquinone, etc.), hydroquinone derivatives and benzotriazole derivatives (e.g., 4-sulfobenzotriazole,
-carboxybenzotriazole, etc.) can be preferably used in combination. As a silver image stabilizer, U.S. Pat.
3707377, polyhalogenated organic oxidizing agents (e.g., tetrabromobutane, tribromoquinaridine, etc.), 5-methoxycarbonylthio-1-phenyltetrazole, specifically described in Belgian Patent No. 768071, Monohalo compounds (e.g., 2-bromo-2-tolylsulfonylacetamide, etc.) described in JP-A No. 119624-1987,
Bromine compounds described in No. 120328 (e.g., 2-bromomethylsulfonylbenzothiozole, 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 as described in No. 119624 can be used. Other image stabilizers include U.S. Pat.
No. 3220846, No. 4082555, No. 4088496, JP-A-Sho
50-22625, Research Disclosure (RD) No. 12021, RD No. 156168, RD No. 15567, RD No.
Compounds called activator precursors that release basic substances by heat, such as guanidinium, which releases a base by decarboxylation with heat, described in No. 15732, No. 15733, No. 15734, No. 15776, etc. Compounds such as trichloroacetate, aldnamide compounds such as galactonamide, amine imides, 2-carboxycarboxamide, etc.
In addition, sodium phosphate base generators described in JP-A-56-130745 and JP-A-56-132332, compounds that generate amines through intramolecular nucleophilic reactions described in British Patent No. 2079480, JP-A-56-130745 and JP-A-56-132332; Aldoxime carbamates described in No. 59-157637, No. 59-
Hydroxamic acid carbamates etc. described in No. 166943, No. 59-180537, No. 59-174830, No. 59-174830,
Examples include base releasing agents described in No. 59-195237 and the like. Furthermore, U.S. Patent No. 3301678, U.S. Patent No. 3506444, U.S. Patent No.
No. 3824103, No. 3844788, No. RD12035, No. 3824103, No. 3844788, No. RD12035, No.
Illithiuronium compounds, s-carbamoyl derivatives of mercapto-containing compounds, and nitrogen-containing heterocyclic compounds described in US Pat.
No. 4012260, No. 4060420, No. 4207392,
Activator stabilizer and nitrogen-containing organic base called activator stabilizer precursor described in RD15109 and RD17711, etc., such as α-sulfonylacetate or trichloroacetate of 2-aminothiazoline, acylhydrazine compound, etc., are developed. It can be used for the purpose of promoting or for stabilizing the image. Also, for example, JP-A-56-130745, JP-A No. 59-
Development may be carried out in the presence of a small amount of water as described in U.S. Pat. Developing may also be carried out using hot steam, hot air containing moisture, etc., as described in No. 1, etc.
In addition, compounds that release water into heat-developable photosensitive materials, such as compounds containing crystal water as described in Japanese Patent Publication No. 44-26582, such as sodium phosphate dodecahydrate, ammonium alum diquadrate, etc., can be heat developed. It may also be included in the photosensitive 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. In the heat-developable photosensitive material of the present invention, colloidal silica is added to at least one of the heat-developable photosensitive layer and the non-photosensitive layer (e.g., undercoat layer, intermediate layer, protective layer, etc.) for the purpose of improving film properties. Can be used. The colloidal silica used in the present invention mainly uses water as a dispersion medium and has an average particle size of 3 to 120 mμ.
It is a colloidal solution of silicic anhydride, and the main components are:
It is SiO ₂ (silicon dioxide). Regarding colloidal silica, for example, JP-A-56-109336, JP-A No. 53-
It is described in No. 123916, No. 53-112732, No. 53-100226, etc. The amount of colloidal silica used is
The dry weight ratio to the binder of the layer to be mixed and coated is preferably in the range of 0.05 to 2.0. The heat-developable photosensitive material of the present invention contains an organic fluoro compound in at least one of the heat-developable photosensitive layer and the non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.) for the purpose of improving film properties. can be used. Regarding the organic fluoro compounds used in the present invention, US Pat. No. 3,589,906, US Pat.
3754924, 3775126, 3850640, West German Patent Publication No. 1942665, 1961638, 2124262,
British Patent No. 1330356, Belgian Patent No. 742680, and Japanese Patent Application Laid-open Nos. 46-7781, 48-9715, and 49-
No. 46733, No. 49-133023, No. 50-99529, No. 50
−11322, No. 50-160034, No. 51-43131, No.
No. 51-129229, No. 51-106419, No. 53-84712,
No. 54-111330, No. 56-109336, No. 59-30536
No. 59-45441 and Special Publication No. 47-9303, same.
Examples include compounds described in No. 48-43130 and No. 59-5887, and these compounds can be preferably used. In the heat-developable photosensitive material of the present invention, an antistatic agent can be used in at least one of the heat-developable photosensitive layer and the non-photosensitive layer (eg, undercoat layer, intermediate layer, protective layer, etc.). Antistatic agents used in the present invention include British Patent No. 1466600, Research Disclosure No. 15840, British Patent No. 16258
No. 16630, U.S. Patent No. 2327828, U.S. Pat.
No. 2861056, No. 3206312, No. 3245833, No.
No. 3428451, No. 3775126, No. 3963498, No.
No. 4025342, No. 4025463, No. 4025691, No. 4025342, No. 4025463, No. 4025691, No.
Examples include compounds described in No. 4025704 and the like, and these can be preferably used. In the heat-developable photosensitive material of the present invention, an ultraviolet absorber can be used in at least one of the heat-developable photosensitive layer and the non-photosensitive layer (eg, undercoat layer, intermediate layer, protective layer, etc.). As the ultraviolet absorber used in the present invention, benzophenone compounds (for example, JP-A No. 46-2784,
U.S. Pat. Nos. 3,215,530 and 3,698,907), butadiene compounds (e.g., U.S. Pat.
4045229), 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 aryl groups (e.g., Japanese Patent Publication No. 36-10466,
No. 41-1687, No. 42-26187, No. 44-29620,
48-41572, JP-A No. 54-95233, JP-A No. 57-
142975, U.S. Patent No. 3253921, U.S. Patent No. 3533794,
Same No. 3754919, No. 3794493, No. 4009038, Same No.
4220711, 4323633, Research Disclosure 22519), benzoxide compounds (e.g.
U.S. Pat. No. 3,700,455), cinnamate ester compounds (e.g., U.S. Pat. No. 3,705,805;
No. 3707375, as described in JP-A-52-49029)
can be mentioned. In addition, U.S. Patent No.
Those described in No. 3499762 and JP-A-54-48535 can also be used. Ultraviolet absorbing couplers (e.g., α-naphthol cyan dye-forming couplers) and ultraviolet absorbing polymers (e.g., JP-A-58-111942, JP-A No. 178-351, JP-A-181041, JP-A-59-59)
-19945, No. 23344, and those described in publications). In the heat-developable photosensitive material of the present invention, a hardening agent can be used in at least one of the heat-developable photosensitive layer and the non-photosensitive layer (eg, undercoat layer, intermediate layer, protective layer, etc.). Hardeners used in the present invention include aldehyde-based and aziridine-based hardeners (for example, PB Report
19921, U.S. Patent No. 2950197, U.S. Patent No. 2964404,
2983611, 3271175, Japanese Patent Publication No. 46-40898, and JP-A-50-91315), isoxazole type (for example, US Pat. No. 331609) ), epoxy systems (e.g. U.S. Patent No. 3047394, West German Patent No.
1085663, the specifications of British Patent No. 1033518, those described in Japanese Patent Publication No. 1983-35495), vinyl sulfones (for example, PB Report 19920, West German Patent No. 1100942, West German Patent No. 2337412, West German Patent No. 2545722, same
No. 2635518, No. 2742308, No. 2749260, British Patent No. 1251091, Patent Application No. 1974-54236, No. 48-
110996, U.S. Patent No. 3539644, U.S. Patent No. 3490911), acryloyl type (e.g., those described in Japanese Patent Application No. 1983-27949, U.S. Patent No. 3640720) ), carbodiimide type (e.g., U.S. Patent No. 2938892, U.S. Patent No. 4043818,
4061499, those described in Japanese Patent Publication No. 46-38715, and Japanese Patent Application No. 15095/1983), triazine type (for example, West German Patent No. 2410973,
2553915, U.S. Patent No. 3325287, and JP-A-12722), other maleimide-based, acetylene-based, methanesulfonic acid ester-based, and N-methylol-based hardeners are used alone. Or they can be used in combination. As a useful combination technique, for example, West German Patent Nos. 2447587 and 2505746
No. 2514245, U.S. Patent No. 4047957, U.S. Pat.
Specifications of No. 3832181 and No. 3840370, Japanese Unexamined Patent Application Publication No. 1973-
Examples include combinations described in Japanese Patent Publications No. 43319, No. 50-63062, No. 52-127329, and Japanese Patent Publication No. 32364-1983. In the heat-developable photosensitive material of the present invention, a polymer hardener can be used in at least one of the heat-developable photosensitive layer and the non-photosensitive layer (for example, undercoat layer, intermediate layer, protective layer, etc.). . Examples of the polymeric hardening agent used in the present invention include polymers having aldehyde groups (e.g., acrolein copolymers) described in US Pat. No. 3,396,029, US Pat. No. 3,362,827, and Research Disclosure No. 17333. (1978), etc., polymers having dichlorotriazine groups, U.S. Patent No.
Polymers having epoxy groups as described in No. 3623878,
Research Disclosure No. 16725 (1978),
U.S. Patent No. 4161407, Japanese Patent Application Publication No. 54-65033, No. 56
Examples include a polymer having an active vinyl group or a group that can be a precursor thereof, as described in Japanese Patent Application Laid-open No. 142524, and a polymer having an active ester group, as described in JP-A-56-66841. In the heat-developable photosensitive material of the present invention, a polymer is added to at least one of the heat-developable photosensitive layer and the non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.) for the purpose of improving the physical properties of the film. Latex can be used. Preferred specific examples of the polymer latex used in the present invention include polymethyl acrylate, polyethyl acrylate, poly-n-butyl acrylate, a copolymer of ethyl 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, and copolymers of ethyl acrylate and 2-acrylamide. The preferred average particle size of the polymer latex is
It is 0.02 μm to 0.2 μm. The amount of polymer latex used is preferably 0.03 to 0.5 in dry weight ratio to the binder of the layer to which it is added. In the heat-developable photosensitive material of the present invention, various materials may be added to at least one of the heat-developable photosensitive layer and the non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.) for the purpose of improving coating properties. surfactants 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-acyl-N- Carboxy groups, sulfo groups, phospho groups, sulfate ester groups, phosphate ester groups, etc. such as alkyl taurines, sulfosuccinates, sulfoalkyl polyoxyethylene alkyl phenyl ethers, polyoxyethylene alkyl phosphates, etc. Those containing an acidic 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. etc. are preferred. Examples of amphoteric surfactants include amino acids,
Aminoalkyl sulfonic acids, aminoalkyl sulfates or phosphoric esters, alkyl betaines,
Amine oxides and the like are preferred. 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 sorbitan esters, polyalkylene glycol alkylamines or amides, polyethylene oxide adducts of silicones), glycidol derivatives (e.g. alkenylsuccinic acid polyglycerides, alkylphenol polyglycerides), fatty acid esters of polyhydric alcohols, alkyl sugars Esters and the like are preferred. The heat-developable photosensitive material of the present invention includes, for the purpose of improving developability, improving image dye transferability, improving optical properties, etc.
Non-photosensitive silver halide grains can be contained in at least one of the heat-developable photosensitive layer and the non-photosensitive layer (eg, undercoat layer, intermediate layer, protective layer, etc.). 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 particle size of the non-photosensitive silver halide grains is about 0.3 μm or less. In addition, the amount added is calculated in terms of silver amount for the layer to be added.
A range of 0.02 to 3 g/m ² is preferred. In the heat-developable photosensitive material of the present invention, for the purpose of improving film properties, at least one of the heat-developable photosensitive layer and the non-photosensitive layer (e.g., undercoat layer, intermediate layer, protective layer, etc.) may contain, for example, a special layer. A vinyl polymer having a carboxyl group or a sulfo group as described in Japanese Patent Publication No. 104338/1986 can be included. The amount of the vinyl polymer used is preferably in the range of 0.05 to 2.0 in terms of dry weight ratio to the binder of the layer to which it is added. 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 its reaction form, negative-acting dye-donors that act in a positive function (i.e.
A positive dye-donor acting on a negative function (i.e., a positive dye image when using a negative-working silver halide) can be classified as Negative dye-donating substances are further classified as follows.

[Table] Coupling dye Coupling dye Release type compound Formation type compound
Each dye-providing substance will be further explained. As the reducing dye releasing compound, for example, the general formula
Examples include compounds represented by (2). General formula (2) Car−NHSO ₂ −Dye In the formula, Car is a reducing substrate (so-called carrier) that is oxidized and releases a dye upon reduction of photosensitive silver halide and/or organic silver salt used as necessary. ), and Dye 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-59.
−60434, No. 59-65839, No. 59-71046, No.
No. 59-87450, No. 59-88730, No. 59-123837,
They are described in the specifications of No. 59-165054 and No. 59-165055, and include, for example, the following compounds. Exemplary dye-donor substances

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

embedded image Another reducible dye-releasing compound includes, for example, a compound represented by the general formula (3). General formula (3)

[Chemical formula] In the formula, A ₁ and A ₂ each have a hydrogen atom, a hydroxy group, or an amino group, and the dye is represented by the general formula (2).
Synonymous with dye. Specific examples of the above compounds are given in JP-A-Sho.
No. 59-124329. Examples of the coupling dye-releasing compound include compounds represented by general formula (4). General formula (4) Cp ₁ (-J) _o1 --Dye In the formula, Cp ₁ is an organic group (so-called coupler residue) that can react with the oxidized form of the reducing agent to release a diffusible dye. , J are divalent bonding groups, and the bond between Cp ₁ and J is cleaved by reaction with the oxidized form of the reducing agent. n ₁ represents 0 or 1, and Dye has the same meaning as defined in general formula (2). Also
Cp ₁ is preferably substituted with various ballast groups in order to make the coupling dye-releasing compound non-diffusible, and the ballast group has 8 or more carbon atoms (or more) depending on the form of the photosensitive material used. (preferably 12 or more) organic groups or sulfo groups,
Hydrophilic groups such as carboxy groups, or 8 or more (more preferably 12 or more) carbon atoms and sulfo groups,
It is a group that also has a hydrophilic group such as a carboxy group. Another particularly preferred ballast group can include polymer chains. Specific examples of the compound represented by the above general formula (4) include JP-A-57-186744, JP-A-57-122596, and JP-A-57-122596;
No. 57-160698, No. 59-174834, No. 57-224883
No. 59-159159 and No. 59-231540, examples of which include the following compounds. Exemplary dye-donor substances

[ka]

[ka]

[Chemical formula] Examples of the coupling dye-forming compound include compounds represented by the general formula (5). General formula (5) Cp ₂ (-F) - (-B) In the formula, Cp ₂ is an organic group (so-called coupler residue), F
represents a divalent bonding group, and B represents a ballast group. The coupler residue represented by Cp ₂ preferably has a molecular weight of 700 or less, more preferably 500 or less, in view of the diffusibility of the dye formed. In addition, the ballast group is preferably the same as the ballast group defined in general formula (4), 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 more preferred. The coupling dye-forming compound having a polymer chain is preferably a polymer having a repeating unit derived from a monomer represented by general formula (6). General formula (6) Cp ₂ (-F)---(-Y)) _l --(-Z)---
(-L) In the formula, Cp ₂ and F have the same meaning as defined in general formula (5), Y represents an alkylene group, arylene group or aralkylene group, l represents 0 or 1, and Z represents It represents a divalent organic group, and L represents an ethylenically unsaturated group or a group having an ethylenically unsaturated group. Specific examples of coupling dye-forming compounds represented by general formulas (5) and (6) include JP-A-59-
No. 124339, No. 59-181345, No. 60-2950, Patent Application No. 179-179657, No. 59-181604, No. 59-182506
No. 59-182507, for example, the following compounds are mentioned. Exemplary dye-donor substances

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[ka]

[C] In the above general formulas (4), (5) and (6), Cp ₁ or
More specifically, the coupler residue defined by Cp ₂ is preferably a group represented by the following general formula.

【formula】

【formula】

【formula】

【formula】

【formula】

【formula】 General formula (13)

[ka] General formula (14)

[ka] General formula (15)

[ka] General formula (16)

[Chemical formula] In the formula, R ⁷ , R ⁸ , R ⁹ and R ¹⁰ 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, and an alkylsulfonyl group. group, arylsulfonyl group, carbamoyl group, sulfamoyl group, acyloxy group,
Represents an amino group, an alkoxy group, an aryloxy group, a cyano group, an alkylsulfonyl group, an arylsulfonyl group, a ureido group, an alkylthio group, an arylthio group, a carboxy group, a sulfo group, or a heterocyclic residue, which can further be a hydroxyl group, a carboxy group , a sulfo group, an alkoxy group, a cyano group, a nitro group, an alkyl group, an aryl group, an aryloxy group, an acyloxy group, an acyl group, a sulfamoyl group, a carbamoyl group, an imide group, a halogen atom, or the like. These substituents are selected depending on the purpose of Cp ₁ and Cp ₂ , and as mentioned above, in Cp ₁ , one of the substituents is preferably a ballast group, and in Cp ₂ , it is preferable that one of the substituents is a ballast group. In order to increase the molecular weight, the substituents are preferably selected so that the molecular weight is 700 or less, more preferably 500 or less. Examples of positive dye-donating substances include oxidizable dye-releasing compounds represented by the following general formula (17). General formula (17)

[Chemical formula] In the formula, W ₁ represents a group of atoms necessary to form a quinone ring (which may have a substituent on this ring), R ¹¹ represents an alkyl group or a hydrogen atom, E is

[Formula] (In the formula, R ¹² represents an alkyl group or a hydrogen atom, and R ¹³ represents an oxygen atom or

Represents [formula]. ) or _-SO2- , r represents 0 or 1, and Dye has the same meaning as defined in general formula (2). Specific examples of this compound are described in the specifications of JP-A-59-166954 and JP-A-59-154445, and include the following compounds. Exemplary dye-donor substances

[ka]

[ka]

[C] Another positive dye-donor substance has the following general formula:
There are compounds that lose their dye-releasing ability when oxidized, such as the compound represented by (18). General formula (18)

[Formula] In the formula, W ₂ represents a group of atoms necessary to form a benzene ring (which may have a substituent on the ring), and R ¹¹ , r, E, and Dye represent the general formula (17 ) has the same meaning as defined in ). Specific examples of this compound are described in the specifications of JP-A-59-124327 and JP-A-59-152440, and include the following compounds. Exemplary dye-donor substances

[ka]

[Chemical Formula] Still another positive dye-providing substance includes a compound represented by the following general formula (19). General formula (19)

[Formula] In the above formula, W ₂ , R ¹¹ and Dye have the same meanings as defined in general formula (18). Specific examples of this compound are described in JP-A-59-154445, etc., and include the following compounds. Exemplary dye-donor substances

[ka]

[Image Omitted] The residue of the diffusible dye represented by Dye in the above general formulas (2), (3), (4), (17), (18) and (19) will be described in further detail. The residue of the diffusible dye preferably has a molecular weight of 800 or less, more preferably 600 or less for the sake of dye diffusivity, and includes azo dyes, azomethine dyes, anthraquinone dyes, naphthoquinone dyes, styryl dyes, nitro dyes, Examples include residues such as quinoline dyes, carbonyl dyes, and phthalocyanine dyes. These dye residues may be in a temporary short-waveform form that allows multiple colors during thermal development or transfer. In addition, these dye residues are used for the purpose of increasing the light resistance of images, for example, in Japanese Patent Application Laid-Open No. 59-48765,
The chelatable dye residues described in No. 59-124337 are also a preferred form. 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. You can decide accordingly, but for example, the usage amount is 1 m ²
It can be used in an amount of 0.005g to 50g, preferably 0.1g to 10g. Any method can be used to incorporate the dye-providing substance used in the present invention into the photographic constituent layer of the heat-developable photosensitive material.
For example, after dissolving in a low boiling point solvent (methanol, ethanol, ethyl acetate, etc.) or a high boiling point solvent (dibutyl phthalate, dioctyl phthalate, tricresyl phosphate, etc.), or by ultrasonic dispersion,
Alternatively, after dissolving in an alkaline aqueous solution (e.g., 10% aqueous sodium hydroxide solution, etc.), it can be used by neutralizing it with a mineral acid (e.g., hydrochloric acid or nitric acid, etc.);
Alternatively, it can be used after being dispersed with a suitable polymer aqueous solution (eg, gelatin, polyvinyl butyral, polyvinyl pyrrolidone, etc.) using a ball mill. The heat-developable photosensitive material of the present invention usually has a
℃~200℃, preferably 100℃~170℃, 1 second~180 seconds, preferably 1.5 seconds~120℃
Develops by simply heating for a second. 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, or by bringing the image-receiving member into close contact with the image-receiving member after heat development and heating. Alternatively, the transfer may be carried out by supplying water and then applying heat if necessary. Further, preheating may be performed in a temperature range of 70° C. to 180° C. before exposure. Also, JP-A-60-
As described in No. 143338 and Japanese Patent Application No. 60-3644, the photosensitive material and the image receiving member may be preheated at a temperature of 80°C to 250°C immediately before thermal development transfer to improve mutual adhesion. good. 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. Light sources commonly used for regular color printing, such as tungsten lamps, mercury lamps, xenon lamps,
Laser beams, CRT beams, etc. can be used as light sources. As the heating means, all methods applicable to ordinary photothermographic 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 on the back surface of the image receiving member for thermal transfer to remove the Joule heat generated by energization. You can also use it. There are no particular restrictions on the heating pattern, including preheating and then reheating, heating at a high temperature for a short time, or at a low temperature for a long time.
Although it is possible to continuously raise, lower, repeat, or even heat discontinuously, a simple pattern is preferable. Alternatively, a method in which exposure and heating proceed simultaneously may be used. The image-receiving layer of the image-receiving member effectively used in the present invention may have the function of receiving the dye in the heat-developable photosensitive layer released or formed by heat development, such as a tertiary amine or quaternary ammonium salt. Among the polymers described in US Pat. No. 3,709,690 are preferably used. For example, as a polymer containing an ammonium salt, polystyrene-co-N,N,N-tri-n-hexyl-N-
The vinyl-benzylammonium chloride ratio is from 1:4 to 4:1, preferably 1:1. Examples of polymers containing tertiary amines include polyvinylpyridine. 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
-The glass transition temperature described in No. 207260, etc. is 40℃
The above examples include those formed of heat-resistant organic polymeric substances of 250°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 with a molecular weight of 2,000 to 85,000, polystyrene derivatives having a substituent having 4 or less carbon atoms, polyvinylcyclohexane, polydivinylbenzene, polyvinylpyrrolidone, polyvinylcarbazole, polyallylbenzene, and polyvinyl. Alcohol, polyacetals such as polyvinyl formal and polyvinyl butyral, polyvinyl chloride, chlorinated polyethylene, polytrichlorinated fluorinated ethylene, polyacrylonitrile, poly-N,N-dimethylallylamide, p-cyanophenyl group, pentachlorophenyl group, and Polyacrylate with 2,4-dichlorophenyl group, polyacryl chloroacrylate, polymethyl methacrylate, polyethyl methacrylate, polypropyl methacrylate, polyisopropyl methacrylate, polyisobutyl methacrylate, poly-tert-butyl methacrylate, polycyclohexyl methacrylate, polyethylene glycol dimethacrylate,
Polyesters such as poly-2-cyano-ethyl methacrylate and polyethylene terephthalate,
Examples include polysulfone, polycarbonates such as bisphenol A polycarbonate, polyanhydrides, polyamides, and cellulose acetates. Also, Polymer Handbook
Second Edition (edited by G.A. Brandlap and E.H. Inmargatsu) Jiyoung
Willy and Sons {Polymer Handbook
2nd ed. (J. Bradrup, EHImmergut) John
Synthetic polymers with a glass transition temperature of 40° C. or lower, as described in Wiley & Sons, are also useful. These polymeric substances may be used alone or in a blend of two or more thereof, or may be used in a combination of two or more as a copolymer. Useful polymers include cellulose acetates such as triacetate and diacetate; polyamides made from combinations such as heptamethylene diamine and terephthalic acid; fluorene dipropylamine and adipic acid; hexamethylene diamine and diphenic acid; hexamethylene diamine and isophthalic acid;
diethylene glycol and diphenylcarboxylic acid,
Examples include polyester, polyethylene terephthalate, and polycarbonate made of a combination of bis-p-carboxybutane and ethylene glycol. These polymers may be modified. For example, polyethylene terephthalate using cyclohexanedimethanol, isophthalic acid, methoxypolyethylene glycol, 1,2-dicarbomethoxy-4-benzenesulfonic acid, etc. as a modifier is also effective. A particularly preferred image-receiving layer is JP-A-59-
Examples include a layer made of polyvinyl chloride described in No. 223425 and a layer made of polycarbonate and a plasticizer described in JP-A-60-19138. 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 from multiple layers. . As the support for the image-receiving member, any material such as a transparent support or an opaque support may be used. Titanium oxide, barium sulfate, calcium carbonate,
Supports containing pigments such as talc, baryta paper, RC paper laminated with thermoplastic resin containing pigments on paper, cloth, glass, metals such as aluminum, etc., and on these supports Examples include a support coated with an electron beam curable resin composition containing a pigment and cured, and a support coated with a coating layer containing a pigment on these 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. When the present invention is applied to a heat-developable color light-sensitive material, the various polymers mentioned above can be used as a mordant for a dye image and as an image-receiving layer. It may be an image-receiving element or the image-receiving layer may be a single layer that is part of a heat-developable color photographic material. If necessary, an opacifying layer (reflection layer) is provided in the photosensitive material.
can also be included, and such layers are used to reflect the desired amount of radiation, such as visible light, that can be used to view the dye image in the image-receiving layer. 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-source image color light-sensitive 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 can 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. [Examples] Hereinafter, the present invention will be explained in more detail using specific examples, but the present invention is not limited to these embodiments. Example 1 <Preparation of organic silver salt dispersion> 5-Methylbenzotriazole and silver nitrate were dissolved in water.
5- obtained by reaction in an alcohol mixed solvent
28.8g of methylbenzotriazole silver and poly(N
-vinylpyrrolidone) was dispersed in an alumina ball mill, and the pH was adjusted to 5.5 to make 200 ml. <Preparation of dye-providing substance dispersion-1> 35.5 g of the exemplary dye-providing substance (PM-7) and 5.00 g of the following hydroquinone compound were added to ethyl acetate.
Dissolved in 200ml of Alkanol XC (manufactured by Dupont)
After mixing with 720 ml of a gelatin aqueous solution containing 124 ml of a 5% by weight aqueous solution and 30.5 g of phenylcarbamoylated gelatin (Rouslow, Type 17819PC) and dispersing with an ultrasonic homogenizer, the ethyl acetate was distilled off.
The pH was adjusted to 5.5 and the volume was 795ml. hydroquinone compound

[Formula] [Preparation of silver iodobromide emulsion] At 50°C, JP-A No. 57-92523, No. 57-
Using the mixing and stirring method described in Publication No. 92524, solution A, in which 20 g of ossein gelatin, 1000 ml of distilled water, and ammonia were dissolved, was mixed with 500 ml of an aqueous solution containing 11.6 g of potassium iodide and 130 g of potassium bromide, and solution B. , 1 mole of silver nitrate and 500 ml of aqueous solution C containing ammonia were simultaneously added while keeping the pAg and PH constant. Further, by controlling the addition speed of Solution B and Solution C, a core emulsion with a silver iodide content of 7 mol %, regular hexahedral grains, and an average grain size of 0.25 μm was prepared.
Next, by coating a silver halide shell with a silver iodide content of 1 mol % in the same manner as above,
Regular hexahedron, average grain size 0.3μm (shell thickness 0.05μm)
A core/shell type silver halide emulsion (m) was prepared. (The monodispersity was 8%.) The above emulsion was washed with water and desalted to obtain a yield of 700 ml. <Preparation of reducing agent dispersion> 23.3 g of reducing agent (R-11), 14.6 g of poly(N-vinylpyrrolidone), 0.50 g of the following fluorine-based surfactant
g was dissolved in water and the pH was adjusted to 5.5 to make 250 ml. surfactant

[Chemical formula] (m, n = 2 or 3) <Preparation of heat-developable photosensitive material-1> Organic silver salt dispersion 12.5ml, silver halide emulsion 6.00ml
ml, dye-donor dispersion 39.8ml, reducing agent dispersion
12.5ml of the hardener solution {tetra(vinylsulfonylmethyl)methane and taurine are reacted at a ratio of 1:1 (weight ratio), dissolved in a 1% aqueous solution of phenylcarbamoylated gelatin, Contains 3% by weight of sulfonylmethyl)methane. } and 3.80 g of polyethylene glycol 300 (Kanto Kagaku) as a hot solvent.
After adding it, it was placed on a photographic polyethylene terephthalate film with a thickness of 180 μm that was undercoated.
It was applied so that the amount of silver was 1.76 g/m ² . <Preparation of protective layer> Dispersion A: 24 g of dioctyl phthalate and 6 g of ethyl acetate.
Mix and dissolve at 65°C, add this solution to 100cc of 5% gelatin aqueous solution containing 1g of sodium triisopropylnaphthalene sulfonate heated to 50°C with stirring, and then pass through a colloid mill 5 times to disperse. , Dispersion A was prepared. Dispersion B 24 g of dioctyl phthalate and 6 g of ethyl acetate were mixed and dissolved, and this solution was heated to 50°C. 60 c.c. of 5% gelatin containing 1 g of sodium triisopropylnaphthalene sulfonate and 5% polyvinylpyrrolidone (molecular weight 30,000 ) was added to a mixed solution of 40 c.c. with stirring, and then dispersed through a colloid mill 5 times to prepare dispersion B. Dispersion C Dispersion C was prepared in a similar manner using the same amount of tricresyl phosphate in place of dioctyl phthalate in Dispersion B. Dispersion D: 9 g of 2,5-t-octylhydroquinone, 15 g of dioctyl phthalate and 6 g of ethyl acetate
Sodium triisopropylnaphthalene sulfonate 1 dissolved by heating at ℃ and heated this solution to 50℃
and 40 c.c. of 5% poly-N-vinylpyrrolidone (molecular weight 30,000) with stirring, and then passed through a colloid mill five times to disperse the dispersion D. Prepared. Dispersion E Instead of 2,5-tert-octylhydroquinone in Dispersion D, a mixture of compounds (A), (B), (C) and (D) (mixing ratio Compound (A): Compound (B): Compound
Dispersion E was prepared using 9 g of (C): compound (D) = 2:1:1:1. Compound (A)

【formula】 Compound (B)

【formula】 Compound (C)

【formula】 Compound (D)

[Formula] The oil droplet dispersions (A), (B), (C), (D) and (E) are applied to the upper layer of the photosensitive material so that the dry film thickness is 0.8 μm, and the photosensitive material (1 ), (2), (3), (4) and (5). <Production of image receiving member-1> Polyvinyl chloride (n=
1100 (Wako Pure Chemical Industries, Ltd.) in tetrahydrofuran so that the amount of polyvinyl chloride was 12 g/m ² . The photothermographic materials (1), (2), (3), (4) and (5) were exposed to 1600 C.MS through a step wedge, and together with the image receiving member, they were placed in a heat developing machine (developer). Tupper module 277, 3M) at 150℃
After heat development was carried out for 1 minute, the photosensitive material and the image receiving member were peeled off, and a magenta color step wedge negative image was obtained on the polyvinyl chloride surface of the image receiving member. The reflection density of the obtained image was measured using a densitometer (PDA-65,
(manufactured by Konishiroku Photo Industry Co., Ltd.) to measure (maximum density (Dmax) and fog density (Dmin)) and to observe release properties and film adhesion of the protective layer. The results are shown in Table-1. Comparative Example 1 Liquids obtained by removing dioctyl phthalate and ethyl acetate from Dispersion A and Dispersion B were respectively applied to the upper layer of the photosensitive element so that the dry film thickness was 0.8 μm, and photosensitive materials (6) and (7) were coated. ), and the same exposure and heat development as in Example 1 were performed. The results are shown in Table-1.

【table】

[Table] Example 2 <Preparation of dye-providing substance dispersion-2> Exemplary dye-providing substance 30.0g was added to tricresyl phosphate.
30.0 g and an aqueous gelatin solution containing a surfactant, the same as in Example 1, dissolved in 90.0 ml of ethyl acetate.
After mixing with 460 ml and dispersing with an ultrasonic homogenizer, ethyl acetate was distilled off, and water was added to make 500 ml. <Preparation of heat-developable photosensitive material-2> 40.0 ml of the silver halide emulsion, 25.0 ml of the organic silver salt dispersion, and 50.0 ml of the dye-providing substance dispersion-2 were mixed, and polyethylene glycol 300 (Kanto) was added as a heat solvent. Chemistry) 4.20g, 1-phenyl-4,
1.5 ml of a 10 wt% methanol solution of 4'-dimethyl-3-pyrazolidone, 3.00 ml of the same hardening agent as in Example 1, and 20.0 ml of a 10 wt% water-alcohol solution of guanidine trichloroacetic acid were added to undercoat. The silver content was 2.50 g/m ² on a photographic polyethylene terephthalate film having a thickness of 180 μm. <Preparation of protective layer> The oil droplet dispersions (A) and (B) described in Example 1 were added to the upper layer of the photosensitive material-2 so that the dry film thickness was 0.8 μm.
(C), (D) and (E) were applied respectively, and the photosensitive materials (8), (9),
(10), (11), and (12). <Preparation of Image Receiving Member-2> The following layers were sequentially coated on a 100 μm thick transparent polyethylene terephthalate film. (1) Layer made of polyacrylic acid (7.00g/m ² ) (2) Layer made of cellulose acetate (4.00g/m ² ) (3) Styrene and N-benzyl-N,N-dimethyl-N-(3 - a layer consisting of a 1:1 copolymer of maleimidopropyl) ammonium chloride and gelatin (3.00 g/m ² copolymer, gelatin
3.00g/m ² ) (4) Urea and polyvinyl alcohol (saponification degree 98
%) (4.0 g/m ² of urea, 3.0 g/m ² of polyvinyl alcohol) was applied to the photothermographic materials (8), (9), (10), (11), and (12) through a step wedge. Exposure to 1600C.MS and use a heat developing machine together with the image receiving member 2.
After thermal development at 150° C. for 1 minute, image receiving member 2 was immediately peeled off. The transmission density of the yellow transparent image obtained on the surface of the image receiving member was measured using a densitometer (PDA-65,
(manufactured by Konishiroku Photo Industry Co., Ltd.), and the releasability and film adhesion of the protective layer were also observed. The results are shown in Table-2. Comparative Example 2 A liquid obtained by removing dioctyl phthalate and ethyl acetate from Dispersion A and Dispersion B described in Example 1 was applied to the upper layer of the photosensitive material so that the dry film thickness was 0.8 μm, and the photosensitive material (13 ) and (14) were prepared and subjected to the same exposure and heat development as in Example 2. Display the results -
Shown in 2.

【table】

[Table] As is clear from Examples 1 and 2, in the photosensitive material containing oil droplets in the protective layer of the present invention, the peelability between the photosensitive layer and the image-receiving material and the film adhesion of the protective layer are good, and there is no density unevenness. However, with photosensitive materials that do not contain oil droplets in the protective layer (comparative example), the peelability of the photosensitive layer and image-receiving material and the film adhesion of the protective layer are poor, resulting in uneven density and images. It has the disadvantage of conspicuous contamination. Example 3 A photosensitive material and an image-receiving material having the following configurations were prepared,
The photosensitive material was exposed to red, green, blue, and white light at 1600C.MS from the support side, brought into close contact with the image-receiving material, and thermally developed at 150℃ for 1 minute.
The results shown are obtained. Protective layer Gelatin (0.36g), dioctyl phthalate (2.0g), SiO ₂ (0.36g), saffron (0.1
g) Red-sensitive layer methylbenztriazole silver (1.6g),
Reducing agent (R-11) 0.57g, exemplary dye-donating substance
PM-5 (0.8g), red-sensitive silver halide (*1)
(contains 0.58 g in terms of silver), the hydroquinone compound (60 mg), gelatin (0.75 g), phthalated gelatin (0.75 g), polyvinylpyrrolidone (0.5 g), 3-methylpentane-1,3,5-
Triol (0.38g), polyethylene glycol (1.1g), AlK-XC (*3) (80mg), hardener (60mg) Intermediate layer gelatin (0.5g), CD' scavenger (*4) (0.4g) , methylbenztriazole silver (1.2g), hardener (20mg) Green-sensitive layer Contains exemplary dye-donor PM-4 (1.3g), green-sensitive silver halide (*2), silver equivalent: 0.76
g), methylbenztriazole silver (2.1g),
Reducing agent (R-11) 0.76g, the above hydroquinone compound (90mg), gelatin (1.0g), phthalated gelatin (1.0g), polyvinylpyrrolidone (0.66g), 3-methylpentane-1,3,5-
Triol (0.5g), polyethylene glycol (1.5g), AlK-XC (*3) (0.11g), hardener (80mg) Intermediate layer Y-filter dye (*5) (0.42g),
CD' scavenger (*4) (0.4g), methylbenztriazole silver (1.2g), gelatin (0.5
g), hardener (20 mg), blue-sensitive layer exemplary dye-donor PM-1 (1.4 g), blue-sensitive silver halide (0.97 g in silver terms), methylbenztriazole silver (2.7 g), reducing agent (R −11)
0.97g, the hydroquinone compound (90mg),
Gelatin (1.26g), phthalated gelatin (1.26g)
g), polyvinylpyrrolidone (0.84g), 3-methylpentane-1,3,5-triol (0.63
g), polyethylene glycol (1.9g), AlK
-XC (*3), (0.14g), Hardener (0.1g) Gelatin layer Gelatin (2.5g) Support 180μm polyethylene terephthalate film with latex subbing (amount applied per ^1m2 of support) Image receiving Component image-receiving layer: 10 g of polycarbonate, the following compound (1)
0.5g, 0.5g of the following compound (2) Support Baryta paper (amount applied per 1 m ² of support) Compound (1)

[ka] Compound (2)

[ka] (*1) Sensitizing dye

[ka] (*2) Sensitizing dye

[ka] (*3)AlK−XC

[ka] (*4)

[ka] x/y=1/1 (weight ratio) (*5)

[ka] x/y=1/1 (weight ratio)

[Table] The photothermographic material having the multilayer structure shown in Example 3 had good peelability and film adhesion, and transferred images without density unevenness or stains were obtained.

Claims (1)

[Claims] 1 In a heat-developable color photosensitive material having a photographic constituent layer consisting of at least one heat-developable photosensitive layer and at least one non-photosensitive layer on the support, support of the heat-developable photosensitive layer furthest from the support. It has at least one non-photosensitive protective layer on the side opposite to the body, and at least one of the non-photosensitive protective layers
The layer contains esters of glutaric acid, adipic acid, phthalic acid, sebacic acid, succinic acid, maleic acid, fumaric acid, mazelaic acid, isophthalic acid, terephthalic acid, and phosphoric acid, each having a melting point of 50°C or lower. 1. A heat-developable color photosensitive material, characterized in that it contains oil droplets having an average particle size of 0.1 to 10 μm formed from an organic compound selected from the group consisting of esters of glycerin, paraffin, and fluorinated paraffin.