JPS6260694B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for forming color images by thermal development. The present invention particularly includes:
In a heat-developable color photosensitive material containing a dye-donating substance that releases a diffusible dye upon heat development, a color image is obtained by thermal diffusion transfer of the dye released by heat development onto a dye-receiving support. It is about new methods. Photography using silver halide has superior photographic properties such as sensitivity and gradation control compared to other photographic methods such as electrophotography and diazo photography.
It has traditionally been the most widely used. In recent years, a technology has been developed that allows images to be easily and quickly obtained by changing the image forming method for photosensitive materials using silver halide from the conventional wet processing using a developer to a dry processing using heating, etc. It has been. Heat-developable photosensitive materials are well known in the art, and the heat-developable photosensitive materials and their processes are described in U.S. Pat.
No. 3457075, British Patent No. 1131108, No. 1167777
issue and Research Disclosure Magazine, June 1978 issue, pages 9-15 (RD-17029). For information on how to obtain a color image,
Many methods have been proposed. Regarding the method of forming a color image by combining an oxidized form of a developer with a coupler, U.S. Pat.
-Aminophenol-based reducing agent received Belgian patent no.
Issue 802519 and Research Disclosure Magazine
On pages 31 and 32 of the September 1975 issue, sulfonamide phenolic reducing agents were also disclosed in U.S. Patent No. 4021240.
In this issue, sulfonamide phenolic reducing agents and 4
Combinations with equivalent colors have been proposed. However, in such a method, a reduced silver image and a color image are simultaneously generated in the exposed area after thermal development, so that the color image becomes cloudy. To solve this problem, there are methods to remove the silver image by liquid processing or to transfer only the dye to another layer, such as a sheet with an image-receiving layer. It has the disadvantage that it is not easy to transfer. In addition, a method of introducing a nitrogen-containing heterocyclic group into a dye, forming a silver salt, and releasing the dye by heat development is described in Research Disclosure Magazine, May 1978 issue 54.
Described on page 58 RD-1966. With this method, it is difficult to suppress the release of dye in areas not exposed to light, and a clear image cannot be obtained, so it is not a common method. Further, regarding the method of forming positive color images by thermal silver dye bleaching method, see, for example, Research Disclosure Magazine, April 1976 issue, pages 30-32 (RD-14433), December 1976 issue, pages 14-15 of the same magazine. Page (RD-15227), U.S. Pat. No. 4,235,957, and others, useful methods of bleaching dyes are described. However, this method requires extra steps and materials, such as stacking and heating activator sheets to accelerate the bleaching of the dye, and the resulting color images may coexist during long-term storage. It had the disadvantage of being gradually reductively bleached by free silver and the like. Further, regarding the method of forming color images using leuco dyes, for example, US Pat. No. 3,985,565,
No. 4022617. However, this method has the disadvantage that it is difficult to stably incorporate the leuco dye into the photographic material, and the material gradually becomes colored during storage. The present invention provides a new method for forming color images by thermal development and solves the drawbacks of hitherto known materials. That is, an object of the present invention is to provide a new image forming method in which a color image is obtained by thermally transferring a hydrophilic dye released by thermal development to an image receiving material containing a mordant. An object of the present invention is to provide a method for obtaining clear color images using a simple method. An object of the present invention is to provide a method for obtaining color images that are stable over a long period of time. These purposes are aimed at producing a heat-developable color photosensitive material containing at least a photosensitive silver halide, a hydrophilic binder, a dye release aid, and a dye-donating substance represented by the general formula () or the general formula () on a support. This is achieved through materials. The heat-developable color photosensitive material of the present invention can simultaneously provide a silver image having a negative-positive relationship with the original and a diffusible dye in the area corresponding to the silver image, simply by performing heat development after image exposure. . That is, when the heat-developable color photosensitive material of the present invention is imagewise exposed and heat-developed, an oxidation-reduction reaction occurs between the silver halide and the dye-donating substance using the exposed photosensitive silver halide as a catalyst, and silver is deposited in the exposed area. An image arises. In this step, the dye-donating substance is oxidized by silver halide to become an oxidant. This oxidant is cleaved in the presence of a dye release aid, resulting in the release of a hydrophilic, diffusible dye.
Therefore, a silver image and a diffusible dye are obtained in the exposed area, and a color image is obtained by transferring the diffusible dye. All reactions that release the diffusible dyes of the present invention are conducted in dry films at elevated temperatures. This release reaction of the diffusible dye is thought to be caused by attack by a so-called nucleophile, and is usually carried out in a liquid. In the present invention, although it depended on the type of dye-providing compound, generally a high reaction rate was shown even in a dry film. This high response rate is an unexpected finding. Further, the dye-donating compound of the present invention can undergo a redox reaction with silver halide without the aid of a so-called auxiliary developer. This is an unexpected result based on previous findings at temperatures around room temperature. The reducing dye-donating substance that releases the hydrophilic diffusible dye used in the present invention is represented by the following general formula () or (). Here, G is a hydroxyl group or a group that gives a hydroxyl group by hydrolysis, Col is a pigment or a group that gives a pigment,
R ¹ is an alkyl or ^aromatic group;
R ¹ ; X and R ² or R ¹ and R ² may be linked to form a ring. R ³ represents an alkyl group, an alkyloxy group, a halogen atom, an acylamino group, or an alkylthio group, and R ² and R ³ or R ¹
and R ³ may continue to form a ring. The alkyl groups and alkyl residues mentioned above include unsubstituted and substituted alkyl groups as well as straight chain, branched and cyclic alkyl groups. In particular, in the above, specific examples of G include, in addition to a hydroxyl group, an acyloxy group such as an acetoxyl group and a propionyloxy group. As G, a hydroxyl group is particularly preferable. Examples of Col include groups such as azo dyes, azomethine dyes, anthraquinone dyes, naphthoquinone dyes, styryl dyes, nitro dyes, quinoline dyes, carbonyl dyes, phthalocyanine dyes, and metal complex salts thereof. Typical dye-giving groups represented by Col include those that give dyes through hydrolysis,
For example, as described in JP-A-48-125818, U.S. Pat. By temporarily shortening dye absorption during exposure through acylation, it is possible to prevent desensitization due to light absorption when these color image forming agents are mixed with light-sensitive emulsions and coated. can. Note that for this purpose, it is also possible to use a dye that has different hues when transferred onto the mordant and when present in the emulsion layer. Note that the Col moiety can have a group that imparts water solubility, such as a carboxyl group or a sulfonamide group. Preferred examples of R ¹ include linear or branched alkyl groups having 1 to 30 carbon atoms (e.g. methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, dodecyl, pentadecyl, hexadecyl, octadecyl, isopropyl, isobutyl , t-butyl, t-amyl, neopentyl, etc.), substituted alkyl groups (e.g., hydroxyethyl, benzyl, methoxyethyl, etc.), phenyl groups; substituted phenyl groups (e.g., p-amylaminophenyl group, p-nitrophenyl, etc.) ), etc. Preferred examples of X or R ² include a hydrogen atom,
Methyl, ethyl, propyl, butyl, pentyl,
hexyl, octyl, dodecyl, pentadecyl,
Straight chain or branched alkyl groups such as hexadecyl, octadecyl, isopropyl, isobutyl, t-butyl, t-amylneopentyl, t-octyl;
Substituted alkyl groups such as hydroxylethyl, benzyl, phenylethyl, methoxyethyl, ethoxyethyl; phenyl group; substituted phenyl groups; methoxy, ethoxy, propyloxy, isopropyloxy, octyloxy, dodecyloxy, tetradecyloxy, hexadecyloxy, octadecyl Straight chain or branched alkyloxy groups such as oxy; phenyloxy groups; substituted phenyloxy groups; substituted alkyloxy groups; halogen atoms such as chlorine and bromine; acetylamino; acylamino groups such as stearyl amino; methylthio, ethylthio, octylthio, dodecylthio , an alkylthio group such as hexadecylthio;
R ¹ ; X and R ² ; or R ¹ and R ² may form a condensed ring. Preferred examples of R ³ include the groups listed above for X or R ² excluding a hydrogen atom. These compounds require ballast groups to substantially prevent diffusion or runoff. The size or number of carbon atoms required for the ballast group depends on the conditions used, such as the heat development concentration and Col.
The total number of X, R ¹ , R ² and R ³ must be at least 8 or more, although it varies depending on the number and type of water-soluble groups contained in the moiety. When the number of carbon atoms becomes larger than necessary,
Although it becomes disadvantageous in terms of solubility and extinction coefficient,
In principle, there is no upper limit to the number of carbon atoms. Generally, the most preferable range is for the total number of carbon atoms in X, R ¹ , R ² and R ³ to be around 13 to 40. In a further preferred embodiment of the present invention, in the formula or formula, G is a hydroxyl group, X is a hydrogen atom, and R ¹ , R ² , and R ³ are each an alkyl group of 1 to 38. Another preferred embodiment of the present invention is the formula (), where G is a hydroxyl group, X is a hydrogen atom, and R ² and R ³ are bonded to form a bicyclic condensed ring. . In the most preferred embodiment of the present invention, in formula () or formula (), ^G is a hydroxyl group, group, octadecyl group), R ² has 1 to 1 carbon atoms
10 alkyl groups (e.g. methyl, ethyl, propyl, isopropyl, butyl, (t)
-Butyl, pentyl, t-pentyl, hexyl,
t-hexyl, octyl, t-octyl), R ³ is an alkyl group having 1 to 10 carbon atoms (for example, methyl group, ethyl group, propyl, isopropyl, butyl, t-butyl, pentyl, t-pentyl, xyl, t-hexyl, octyl, t-octyl), -hexyl, octyl, t-octyl). In another most preferred embodiment of the present invention, the formula ( ) is represented, G is a hydroxyl group, X is a hydrogen atom, and R ² and R ³ are bonded to form a 5- to 8-membered ring, particularly preferably a 6-membered ring. This is the case when a ring is formed (for example, when R ² and R ³ each take 1 (CH ₂ -) ₂ ). The properties required of the dye-providing substance of the present invention include the following. 1. To be rapidly oxidized by silver halide and to efficiently release a diffusible dye for image formation through the action of a dye release aid. 2. The dye-donating substance must be immobilized in a hydrophilic or hydrophobic binder, and only the released dye must have diffusibility. 3. Excellent stability against heat and dye release aids, and should not release image-forming dyes until oxidized. 4. Easy to synthesize. Dyes that can be used for image forming dyes are azo dyes,
There are azomethine dyes, anthraquinone dyes, naphthoquinone dyes, styryl dyes, nitro dyes, quinoline dyes, carbonyl dyes, phthalocyanine dyes, and representative examples are shown by hue. It should be noted that these dyes can also be used in a temporarily shortened form that can be restored in color during development. In the above formula, R ₁₁ to _{R 16} are each a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkoxy group, an aryloxy group, an aryl group, an acylamino group, an acyl group, a cyano group, a hydroxyl group, an alkylsulfonylamino group, Arylsulfonylamino group, alkylsulfonyl group, hydroxyalkyl group, cyanoalkyl group, alkoxycarbonylalkyl group, alkoxyalkyl group, aryloxyalkyl group, nitro group, halogen, sulfamoyl group, N-substituted sulfamoyl group, carbamoyl group, N- It represents a substituent selected from a substituted carbamoyl group, an acyloxyalkyl group, an amino group, a substituted amino group, an alkylthio group, and an arylthio group, and the alkyl group and aryl group moiety in these substituents further include a halogen atom, hydroxyl group, cyano group, acyl group, acylamino group, alkoxy group, carbamoyl group, substituted carbamoyl group, sulfamoyl group, substituted sulfamoyl group,
carboxyl group, alkylsulfonylamino group,
It may be substituted with an arylsulfonylamino group or a ureido group. The characteristics required for image-forming dyes are that they have a hue suitable for one-color reproduction, that they have a large two-molecule extinction coefficient, and that they are resistant to light, heat, and dye release aids and other additives contained in the system. 4) It is easy to synthesize; 5) It has a hydrophilic group and has mordant properties with respect to cationic mordants. Specific examples of preferred image-forming dyes that satisfy these conditions are shown below. Here H ₂ N―SO ₂
represents a binding site with a reducing substrate. Hydrophilic groups include hydroxyl group, carboxyl group, sulfo group, phosphoric acid group, amido group, hydroxamic acid group, quaternary ammonium group, carbamoyl group, substituted carbamoyl group, sulfamoyl group, substituted sulfamoyl group, sulfamoylamino group, substituted Examples include a sulfamoylamino group, a ureido group, a substituted ureido group, an alkoxy group, a hydroxyalkoxy group, and an alkoxyalkoxy group. In the present invention, those whose hydrophilicity is significantly increased by proton dissociation under basic conditions are particularly preferred (PKa<12), and these include phenolic hydroxyl groups, carboxyl groups, sulfo groups, phosphoric acid groups, and imide groups. , a hydroxamic acid group, a (substituted) sulfamoyl group, a (substituted) sulfamoylamino group, and the like. Specific examples of the dye-donating substance used in the present invention are shown below. Next, the method for synthesizing the dye-donating substance will be described. Generally, the dye-donating substance of the present invention is obtained by condensing an amino group of a reducing substrate with a chlorosulfonyl group of an image-forming dye moiety. The amino group of the reducing substrate can be introduced by reducing a nitro, nitroso, or azo group or opening a benzoxazole depending on the type of substrate.
It can be used both as a free base and as a salt of an inorganic acid. On the other hand, the chlorosulfonyl group in the image-forming dye moiety can be derived from the sulfonic acid or sulfonate of the dye by a conventional method, ie, by the action of a chlorinating agent such as phosphorus oxychloride, phosphorus pentachloride, or thionyl chloride. The condensation reaction between a reducing substrate and an image-forming dye moiety is generally carried out using pyridine, picoline, lutidine, triethylamine, diisopropylethylamine in an aprotic polar solvent such as dimethylformamide, dimethylacetamide, dimethylsulfoxide, N-methylpyrrolidone, or acetonitrile. It can be carried out in the presence of an organic base such as at a temperature of 0 to 50°C, and the desired dye-providing substance can usually be obtained in an extremely good yield. An example of its synthesis is shown below. Synthesis Example 1 Synthesis of Compound (8) a Synthesis of 5-hydroxy-2-methyl-6,7-tetramethylenebenzoxazole 2,5-dihydroxy-3,4-tetramethyleneacetophenone 206g, hydroxylamine hydrochloride 105g , sodium acetate 164g, ethanol
800 ml and 300 ml of water were mixed and heated under reflux for 4 hours. The reaction solution was poured into 5 and the precipitated crystals were collected to obtain 215 g of 2,5-dihydroxy-3,4-tetramethyleneacetophenone oxime. Dissolve 45g of this oxime in 400ml of acetic acid and heat to 120°C.
Hydrogen chloride gas was blown into the mixture for 2 hours while heating and stirring. After cooling, the precipitated crystals were collected and washed with water to give 5-hydroxy-2-methyl-6,
28 g of 7-tetramethylenebenzoxazole (melting point 226-228°C) was obtained. b 5-hexadecyloxy-2-methyl-6,
Synthesis of 7-tetramethylenebenzoxazole 5-hydroxy-2-methyl-6,7-tetramethylenebenzoxazole 21 synthesized in a above
g, 1-bromohexadecane 36.6g, potassium carbonate 24.0g, N,N-dimethylformamide 120ml
was stirred at 90°C for 5 hours. The solid was separated from the reaction solution, and the solution was poured into 500 ml of methanol. The precipitated crystals were collected and 5-hexadecyloxy-2
-Methyl-6,7-tetramethylenebenzoxazole (38 g) was obtained. c 2-amino-4-hexadecyloxy-5,
Synthesis of 6-tetramethylenephenol 5-hexadecyloxy-2-methyl-6,7-tetramethylenebenzoxazole 43 obtained in step b
g, 120 ml of ethanol, and 96 ml of 35% hydrochloric acid,
The mixture was stirred and refluxed for 5 hours. After cooling the reaction solution, the precipitated crystals were collected to obtain 34 g of 2-amino-4-hexadecyloxy-5,6-tetramethylenephenol hydrochloride. d Synthesis of carbon donor substance (8) 2-amino-4-hexadecyloxy-5,6
-4.4 g of tetramethylenephenol hydrochloride and 4-[3-chlorosulfonyl-4-(2-methoxyethoxy)phenylazo]-2-(N,N-diethylsulfamoyl)-5-methylsulfonylamino-1-naphthol 6.5 g of (the following structural formula) was dissolved in 20 ml of N,N-dimethylacetamide, and 4.2 ml of pyridine was added. After stirring for 1 hour at 25°C, the reaction solution was poured into dilute hydrochloric acid. The precipitated solid was collected and purified by silica gel column chromatography (eluted with a mixed solvent of chloroform-ethyl acetate (2:1)). Yield 5.1g Synthesis Example 2 Synthesis of compound (17) a 4-acetyl-6-t-butylbenzene-
Synthesis of 1,2,3-triol oxime 4-acetyl-6-t-butylbenzene-1,
50 g of 2,3-triol, 250 ml of ethanol, 40 g of sodium acetate and 20 g of hydroxylamine hydrochloride were mixed, and 110 ml of water was added to form a homogeneous solution. This was refluxed under stirring for 2 hours. The reaction solution was poured into 2 parts of water, and the precipitated crystals were collected to obtain 47.4 g of the title oxime. b 5-t-butyl-6,7-dihydroxy-2
-Synthesis of methylbenzoxazole 12.0g of the oxime obtained in step a above was mixed with 9.3ml of N,N-dimethylacetamide and 28ml of acetonitrile.
and cooled on ice. This includes phosphorus oxychloride 4.8
ml was added dropwise over 10 minutes, and the mixture was stirred for 1 hour. When this is poured into water containing 12g of sodium acetate,
An oil precipitated out and gradually solidified. This was taken and washed with water to obtain 10 g of the title compound. c Synthesis of 5-t-butyl-6,7-dihexadecyloxy-2-methylbenzoxazole 10 g of the compound obtained in b, 1-bromohexadecane
28.0 g of potassium carbonate, 20.0 g of potassium carbonate, and 50 ml of N,N-dimethylformamide were mixed, and the mixture was heated and stirred on a steam bath for 8 hours. Pour the reaction mixture into water,
Extracted with ethyl acetate. The extract was dried over anhydrous sodium sulfate and then concentrated to obtain the title compound as an oil. Although this contained by-products in addition to the desired compound, it was used in the next step as it was. d Synthesis of 2-amino-4-t-butyl-5,6-dihexadecyloxyphenol hydrochloride The entire amount of the oil obtained in step c was mixed with 80 ml of ethanol and 35 ml of ethanol.
The mixture was mixed with 40 ml of % hydrochloric acid and heated and stirred for 2 hours. When cooled, crystals precipitated and were collected to yield the title compound.
32.3g was obtained. e Synthesis of compound (17) 27.3 g of the compound obtained in step d above, 25.9 g of the dye sulfonyl chloride having the structure shown in Synthesis Example 1d) above, N,
After mixing 140 ml of N-dimethylacetamide and adding 30 ml of pyridine, the mixture was stirred at room temperature for 3 hours.
When the reaction mixture was poured into dilute hydrochloric acid, crude crystals precipitated and were collected. The crude crystals were subjected to silica gel chromatography (ethyl acetate-chloroform 1:
2). The fraction of compound (17) (thin film chromatography (Rf 0.49 with benzene-ethyl acetate 2:1 development) was collected and concentrated.
The residue was recrystallized from 2-propanol. yield
3.6g Synthesis Example 3 Synthesis of compound (18) a 4-acetyl-2-methylbenzene-1,3
-Synthesis of diol oxime 4-acetyl-2-methylbenzene-1,3-
Mix 33 g of diol and 32.8 g of sodium acetate with 160 ml of ethanol, add an aqueous solution (50 ml) of 16.4 g of hydroxylamine hydrochloride, and then add 50 ml of water.
was added to make a homogeneous solution, and the mixture was refluxed with stirring. After refluxing for 3 hours, the mixture was poured into 1 portion of water, and 26.2 g of precipitated crystals were collected. b Synthesis of 2,7-dimethyl-6-hydroxybenzoxazole 25.0 g of the oxime obtained in step a was dissolved under heating in 27 ml of N,N-dimethylacetamide and 83 ml of acetonitrile. Cool this solution on ice and add phosphorus oxychloride.
13.3 ml was added dropwise over 20 minutes. After stirring this for 1 hour, 600ml of ice water (containing 33g of sodium acetate)
When opened, crystals precipitated out, so they were removed. After washing with water and air drying, 21.1 g of the title compound was obtained. mp 177-178℃ c Synthesis of 6-β-methallyloxy-2,7-dimethylbenzoxazole 20.0 g of the above 2,7-dimethyl-6-hydroxybenzoxazole, β-methallyl chloride (3
-Chloro-2-methyl-1-propene) 12.0g,
25 g of potassium carbonate and 60 ml of N,N-dimethylformamide were mixed and heated and stirred in a steam bath for 10 hours. The reaction mixture was poured into water and extracted with ethyl acetate. The ethyl acetate layer was dried over anhydrous sodium sulfate and then concentrated. The obtained oily title compound was directly subjected to the next Claisen rearrangement. d 2,7-dimethyl-6-hydroxy-5-β
-Synthesis of methallylbenzoxazole (Claisen rearrangement) The compound obtained in step c above was heated at 200°C for 8.5 hours. After cooling, 100 ml of carbon tetrachloride was added and crystals precipitated, which were collected to obtain 15.6 g of the title compound. e Synthesis of 2,7-dimethyl-6-hexadecyloxy-5-β-methallylbenzoxazole 14.0 g of the compound obtained in d) above, 20 g of 1-bromohexadecane, 14 g of potassium carbonate and N,N-
60 ml of dimethylformamide was mixed, and the mixture was heated and stirred on a steam bath for 4 hours. The reaction mixture was poured into water and extracted with ethyl acetate. The extract was dried over anhydrous sodium sulfate and then concentrated. The residual oil crystallized on standing. Yield 27.8g f Synthesis of 2,7-dimethyl-6-hexadecyloxy-5-isobutylbenzoxazole 17.0g of the compound obtained in step e above, 200ml of ethanol
Then, 0.5 g of 10% palladium on carbon as a catalyst was charged into an autoclave, hydrogen was introduced under pressure at 40 kg/cm ² , and the autoclave was stirred at 50° C. for 7 hours. After removing the catalyst, the liquid was concentrated. The residual oil crystallized on standing. This compound (14.0g) is as it is,
It was subjected to the next step. g 2-amino-5-hexadecyloxy-3-
Synthesis of methyl-4-isobutylphenol hydrochloride 14.0 g of the compound obtained in f, 70 ml of ethanol and
50 ml of 35% hydrochloric acid was mixed and the mixture was refluxed with stirring for 5 hours. Upon cooling, crystals precipitated and were collected and washed with acetonitrile. Yield 13.2g h Synthesis of dye-donating substance (18) 12.0g of the compound obtained in g above and the above synthesis example
17.1 g of dye sulfonyl chloride with the structure shown in 1d)
was dissolved in 50 ml of N,N-dimethylacetamide, 15 ml of pyridine was added, and the mixture was stirred at room temperature for 1.5 hours. The reaction solution was poured into dilute hydrochloric acid (500 ml of water and 40 ml of 35% hydrochloric acid), and the precipitated crude crystals were collected. This was purified by silica gel column chromatography (eluent: chloroform-ethyl acetate 2:1) to obtain 13.2 g of compound (18). In a similar manner, various θ-aminophenol derivatives were reacted with the dye sulfonyl chloride to synthesize the desired dye-donating substance. An example is shown in the table below.

[Table] The reducible dye-donating substance that releases the diffusible dye of the present invention can be used in a certain concentration range. A generally useful concentration range is from about 0.01 mole to about 4 moles of dye-providing material per mole of silver halide. Concentrations particularly useful in this invention range from about 0.03 mole to about 1 mole per mole of silver. In the present invention, a reducing agent can be used as necessary. The reducing agent in this case is a so-called auxiliary developer, which is oxidized by silver halide and its oxidized product has the ability to oxidize the dye-donating substance. Useful auxiliary developers include hydroquinone, alkyl-substituted hydroquinones such as tert-butylhydroquinone and 2,5-dimethylhydroquinone, catechols, picagallols, halogen-substituted hydroquinones such as chlorohydroquinone and dichlorohydroquinone, and alkyl-substituted hydroquinones such as methoxyhydroquinone. substituted hydroquinones,
There are polyhydroxybenzene derivatives such as methylhydroxynaphthalene. Furthermore, methyl gallate, ascorbic acid, ascorbic acid derivatives,
Hydroxylamines such as N,N′-di-(2-ethoxyethyl)hydroxylamine, pyrazolidones such as 1-phenyl-3-pyrazolidone, 4-methyl-4-hydroxymethyl-1-phenyl-3-pyrazolidone, Reductones and hydroxytetronic acids are useful. Auxiliary developers can be used in a range of concentrations. Useful concentration range is 0.01 for silver halide
A particularly useful concentration range is from 0.1 times molar to 4 times molar. The halogenated residues used in the present invention include silver chloride, silver chlorobromide, silver chloroiodide, silver bromide, silver iodobromide, silver chloroiodobromide, and silver iodide. Particularly preferred silver halides in the present invention are:
Some of the grains contain silver iodide crystals. That is, it is particularly preferable that a pattern of pure silver iodide appears when the silver halide is subjected to X-ray diffraction. Silver halide containing two or more types of halogen atoms is used in photographic light-sensitive materials, and in ordinary silver halide emulsions, silver halide grains form a complete mixed crystal. For example, when X-ray diffraction of the grains of a silver iodobromide emulsion is measured, patterns of silver iodide crystals and silver bromide crystals do not appear, but an X-ray pattern appears at a position between the two, depending on the mixing ratio. Particularly preferred silver halides in the present application are silver chloroiodide, silver iodobromide, and silver chloroiodobromide containing silver iodide crystals in their grains. Such silver halide, for example, silver iodobromide, can be obtained by first adding a silver nitrate solution to a potassium bromide solution to form silver bromide grains, and then adding potassium iodide. The grain size of silver halide is from 0.001μmm to 2
μm, preferably from 0.001 μm to 1 μm. The silver halide used in the present invention may be used as it is, but it may also be compounded with compounds such as sulfur, selenium, tellurium, etc., chemical sensitizers such as compounds such as gold, platinum, palladium, rhodium, and iridium, tin halide, etc. may be chemically sensitized by the use of reducing agents or combinations thereof. For more information, see “The
Theory of the Photographic Process” 4th edition,
TH James, Chapter 5, pages 149-169. The silver halide and the dye-providing substance may be present in the same layer, or a layer containing silver halide may be provided on the layer containing the dye-providing substance. In the present invention, the total amount of photosensitive silver halide is preferably 50 mg to 10 g/m ² in terms of silver. In the present invention, it is advantageous to use an organic silver salt oxidizing agent in combination because the redox reaction is promoted and the maximum color density of the dye is increased. The organic silver salt oxidizing agent used in the present invention is a silver salt that is relatively stable to light, and is heated at a temperature of 80°C or higher, preferably 100°C in the presence of photosensitive silver halide.
When heated to the above temperature, it reacts with the image-forming substance or a reducing agent coexisting with the image-forming substance as required to form a silver image. Examples of such organic silver salt oxidizing agents include the following. It is a silver salt of an organic compound having a carboxyl group, and representative examples include silver salts of aliphatic carboxylic acids and silver salts of aromatic carboxylic acids. Examples of aliphatic carboxylic acids include silver salts of behenic acid, silver salts of stearic acid, silver salts of oleic acid, silver salts of lauric acid, silver salts of capric acid, silver salts of myristic acid, silver salts of palmitic acid, Silver salt of maric acid, silver salt of fumaric acid, silver salt of tartaric acid, silver salt of furoic acid, silver salt of linoleic acid, silver salt of oleic acid,
These include silver salts of adipic acid, silver salts of sebacic acid, silver salts of succinic acid, silver salts of acetic acid, silver salts of butyric acid, and silver salts of camphoric acid. Furthermore, silver salts substituted with halogen atoms or hydroxyl groups are also effective. Silver salts of aromatic carboxylic acids and other carboxyl group-containing compounds include silver salts of benzoic acid;
Silver salt of 3,5-dihydroxybenzoic acid, silver salt of o-methylbenzoic acid, silver salt of m-methylbenzoic acid,
Silver salt of p-methylbenzoic acid, silver salt of 2,4-dichlorobenzoic acid, silver salt of acetamidobenzoic acid, p
-Silver salts of substituted benzoic acids such as silver salts of phenylbenzoic acid, silver salts of gallic acid, silver salts of tannic acid, silver salts of phthalic acid, silver salts of terephthalic acid, silver salts of salicylic acid, silver salts of phenyl acetic acid , silver salt of pyromellitic acid, 3-carboxymethyl-4-methyl-4-thiazoline-2 described in U.S. Pat. No. 3,785,830
- Silver salts such as thione, silver salts of aliphatic carboxylic acids having thioether groups, etc., as described in US Pat. No. 3,330,663. In addition, there are compounds having a mercapto group or a thione group, and silver salts of derivatives thereof. For example, 3-mercapto-4-phenyl-1,
Silver salt of 2,4-triazole, silver salt of 2-mercaptobenzimidazole, 2-mercapto-5-
Silver salts of aminothiadiazole, silver salts of 2-mercaptobenzthiazole, silver salts of 2-(s-ethylglycolamido)benzthiazole, silver s-alkyl (alkyl group having 12 to 22 carbon atoms) thioglycolate, etc. Silver salts of thioglycolic acid, silver salts of dithiocarboxylic acids such as silver salts of dithioacetic acid, silver salts of thioamides, 5-
silver salt of carboxy-1-methyl-2-phenyl-4-thiopyridine, silver salt of mercaptotriazine, silver salt of 2-mercaptobenzoxazole,
Mercaptooxadiazole silver salt, US patent
Silver salts described in 4123274, for example 1, 2,
Silver salt of 3-amino-5-benzylthio 1,2,4-triazole, which is a 4-mercaptotriazole derivative, 3- as described in U.S. Pat. No. 3,301,678
It is a silver salt of a thione compound such as a silver salt of (2carboxyethyl)-4-methyl-4-thiazoline-2thione. In addition, there are silver salts of compounds having imino groups. For example, silver salts of benzotriazole and its derivatives described in Japanese Patent Publications No. 44-30270 and No. 45-18416, silver salts of benzotriazole, silver salts of alkyl-substituted benzotriazoles such as silver salt of methylbenzotriazole, and 5-chlorobenzo Silver salts of halogen-substituted benzotriazoles such as silver salts of triazoles, silver salts of carboimidobenzotriazoles such as silver salts of butylcarboimidobenzotriazoles, 1,2,4-triazoles described in US Pat. No. 4,220,709, and Examples include silver salts of 1-H-tetrazole, silver salts of carbazole, silver salts of saccharin, and silver salts of imidazole and imidazole derivatives. Also, Research Disclosure Vol170,
Organometallic salts such as silver salts and copper stearate described in No. 17029, June 1978 are also organometallic salt oxidizing agents that can be used in the present invention. Although the thermal development process during heating of the present invention is not fully understood, it can be considered as follows. When a photosensitive material is irradiated with light, a latent image is formed on the photosensitive silver halide. Regarding this,
“The Theory of the
Photographic Process” 3rd Edition page 105~
It is described on page 148. By heating the photosensitive material, a reducing agent, in the case of the present invention, a dye-donating substance, is converted into silver halide or silver halide and organic silver hydrochloride using latent image nuclei as a catalyst, with the help of an alkaline agent released by heating. It reduces the oxidizing agent and produces metallic silver, which itself is oxidized. A nucleophilic reagent (dye release aid in the present invention) attacks this oxidized dye-donating substance,
Dye is released. It is necessary that the silver halide and the organic silver salt oxidizing agent, which serve as the starting point for development, be present at a substantially effective distance. Therefore, it is desirable that the silver halide and the organic silver salt oxidizing agent exist in the same layer. Although it is possible to prepare a coating solution by mixing separately formed silver halide and organic silver salt oxidizing agent before use, it is also effective to mix both and mix them in a ball mill for a long time. . Another effective method is to add a halogen-containing compound to the prepared organic silver salt oxidizing agent and form halogen silver with the silver from the organic silver salt oxidizing agent. For information on how to make these silver halides and organic silver salt oxidizing agents and how to mix both, please refer to Research Disclosure No. 17029, JP-A-50-32928, JP-A-51-42529, U.S. Patent No. 3,700,458, Japanese Patent Application Publication 1973-
No. 13224 and JP-A-50-17216. In the present invention, the organic silver salt oxidizing agent used as necessary is 0.1% per mole of silver halide.
mol or more and 200 mol or less and a total of 50 in terms of silver in the photosensitive silver halide and organic silver salt oxidizing agent
mg to 10 g/m ² is suitable. The photosensitive silver halide, organic silver salt oxidizing agent of the present invention is prepared in the following binder. A dye-providing substance is also dispersed in the binder described below. The binders used in the present invention can be contained alone or in combination. A hydrophilic binder can be used for this binder. Hydrophilic binders are typically transparent or translucent hydrophilic colloids, such as proteins such as gelatin, gelatin derivatives, cellulose derivatives, natural substances such as starch, polysaccharides such as gum arabic, and polyvinylpyrrolidone. , synthetic polymeric materials such as water-soluble polyvinyl compounds such as acrylamide polymers. Other synthetic polymeric compounds include dispersed vinyl compounds, which increase the dimensional stability of photographic materials, especially in the form of latexes. Various dye release aids can be used in the heat-developable color photosensitive material of the present invention. A dye release aid is a dye-releasing agent that nucleophilically attacks a dye-donating substance oxidized by a silver halide or organic silver salt oxidizing agent.
A base, a base release agent, or a water release compound is used that can release the diffusible dye. Among these dye release aids, the base or base release agent not only promotes dye release but also promotes the redox reaction between the silver halide or organic silver salt oxidizing agent and the dye-donating substance. Particularly useful. Examples of preferred bases include amines, including trialkylamines, hydroxylamines, aliphatic polyamines, N-alkyl substituted aromatic amines, N-hydroxyalkyl substituted aromatic amines and bis[ Examples include p-(dialkylamino)phenyl]methane. U.S. Pat. No. 2,410,644 describes tetramethylammonium betaine iodide and diaminobutane dihydrochloride, and U.S. Pat. No. 3,506,444 describes organic compounds containing amino acids such as urea and 6-aminocaproic acid, which are useful. A base release agent releases a basic component upon heating. An example of a typical base release agent is British Patent No.
Described in No. 998949. Preferred base releasing agents are salts of carboxylic acids and organic bases; useful carboxylic acids include trichloroacetic acid, trifluoroacetic acid, and useful bases include guanidine, piperidine, morpholine, p-toluidine-2-picoline, and the like. Guanidine trichloroacetic acid, described in US Pat. No. 3,220,846, is particularly useful. Aldonamides described in JP-A No. 50-22625 are preferably used because they decompose at high temperatures to produce bases. A water-releasing compound is a compound that decomposes during thermal development to release water and replaces a compound with a vapor pressure of 10 ^-5 Torr or more at a temperature of 100 to 200°C. These compounds are particularly known for transfer printing of fibers, and are described in Japanese Patent Publication No. 88386/1986.
NH ₄ Fe(SO ₄ ) _{2.12H 2} O and the like are useful. These dye release aids can be used in a wide variety of ways. 1/100 to 10 times molar ratio to silver,
In particular, it is preferably used in a range of 1/20 to 2 times. Further, in the heat-developable color light-sensitive material of the present invention, a compound which activates development and simultaneously stabilizes the image can be used. Therein, U.S. Patent No. 3301678
Isothiuroniums represented by 2-hydroxyethyl isothiuronium and trichloroacetate described in No. 1, 1 and 8 described in U.S. Patent No. 3,669,670
- Bisisothiuriums such as (3,6-dioxaoctane)bis(isothiuronium trifluoroacetate), thiol compounds described in West German Patent No. 2162714, 2-amino-2 described in U.S. Patent No. 4012260 -thiazolium trichloroacetate, 2-amino-5-bromoethyl-2-
Thiazolium compounds such as thiazolium trichloroacetate, bis(2-amino-2-thiazolium) methylene bis(sulfonylacetate), 2-amino-2 described in U.S. Pat. No. 4,060,420
Compounds having α-sulfonylacetate as an acidic moiety such as -thiazolium phenylsulfonylacetate, compounds having 2-carboxycarboxamide as an acidic moiety, and the like described in US Pat. No. 4,088,496 are preferably used. These compounds or mixtures can be used in a wide variety of ways. 1/100 molar ratio to silver
It is preferably used in a range of 10 times to 10 times, particularly 1/20 to 2 times. The heat-developable color photosensitive material of the present invention can contain a heat solvent. As used herein, a "thermal solvent" is a non-hydrolyzable organic material that is solid at ambient temperature but exhibits mixed melting points with other components at or below the heat treatment temperature used. Useful examples of the thermal solvent include compounds that can serve as solvents for developing agents, and compounds that are known to promote the physical development of silver salts using substances with a high dielectric constant. Useful thermal solvents include U.S. Pat.
Polyglycols described in No. 3347675, such as polyethylene glycol with an average molecular weight of 1,500 to 20,000;
Derivatives of polyethylene oxide such as oleate ester, beeswax, monostearin, -SO ₂
-, -CO--containing high dielectric constant compounds, such as acetamide, succinimide, ethyl carbamate, urea, methylsulfonamide, ethylene carbonate, polar substances described in US Pat. No. 3,667,959, lactone of 4-hydroxybutanoic acid, Methylsulfinylmethane, tetrahydrothiophene-1,1-dioxide, 1,10-decanediol described in Research Disclosure Magazine, December 1976 issue, pages 26-28, methyl anisate, biphenyl suberate, etc. are preferred. used. In the case of the present invention, the dye-donating substance is colored, and although it is not so necessary to include an irradiation or anti-halation substance or dye in the light-sensitive material, in order to further improve the sharpness, −3692 publication, U.S. Patent No. 3253921,
Filter dyes and absorbent substances described in specifications such as No. 2527583 and No. 2956879 can be contained. Preferably, these dyes are thermally decolorizable, such as those described in U.S. Pat. No. 3,769,019, U.S. Pat.
Dyes such as those listed under the title are preferred. The photosensitive material according to the present invention may contain various additives known as heat-developable photosensitive materials and layers below the photosensitive layer, such as an antistatic layer, a conductive layer, a protective layer,
It can contain an intermediate layer, an AH layer, a peeling layer, etc. For various additives, “Research
Additives listed in No. 17029 of June 1978 such as plasticizers, sharpness improving dyes, AH dyes, sensitizing dyes, matting agents, surfactants, fluorescent whitening agents, antifading agents Similar to the heat-developable photosensitive layer according to the present invention, the protective layer, intermediate layer, undercoat layer, back layer and other layers also include the following:
Prepare each coating solution and apply the dipping method, air knife method, curtain coating method or U.S. Patent No. 3681294.
A light-sensitive material can be prepared by sequentially coating a support onto a support using various coating methods such as the hopper coating method described in the specification and drying. Furthermore, if desired, two or more layers can be applied simultaneously by the methods described in US Pat. No. 2,761,791 and British Patent No. 837,095. Various exposure means can be used for the heat-developable photosensitive material according to the present invention. The latent image is obtained by imagewise exposure to radiation, including visible light. In general, light sources used for normal color printing, such as tungsten lamps, mercury lamps, halogen lamps such as iodine lamps, xenon lamps, laser light sources, CRT light sources, fluorescent tubes, light emitting diodes, etc. can be used as light sources. The original drawing may be a line image such as a technical drawing, or a photographic image with gradation. It is also possible to photograph portraits of people and landscapes using a camera. The printing from the original drawing may be done by overlaying the original drawing by contact printing, reflection printing, or enlargement printing. In addition, images taken with a video camera, etc. can directly receive image information sent from television stations.
It is also possible to output the image to a CRT or FOT, form the image on a heat-developable photosensitive material using a contact lens or a lens, and then print it. Furthermore, LEDs (light emitting diodes), which have recently seen great progress, are being used as exposure means or display means in various devices. It is difficult to create an LED that effectively emits blue light. In this case, to reproduce a color image, three LEDs emit green, red, and infrared light.
The seeds may be designed so that the parts of the photosensitive material that are sensitive to these lights emit yellow, magenta, and cyan dyes, respectively. That is, the green-sensitive portion (layer) may contain a yellow dye-providing substance, the red-sensitive portion (layer) may contain a magenta dye-providing substance, and the infrared-sensitive portion (layer) may contain a cyan dye-providing substance. Other combinations are also possible as required. In addition to the above method of directly attaching or projecting the original image, the original image illuminated by a light source can be
After reading the information using a light-receiving element such as a CCD and storing it in the memory of a computer, processing this information as necessary and performing so-called image processing, this image information is reproduced on a CRT and used as an image-like light source. There is also a method of directly emitting light from three types of LEDs for exposure based on the processed information. After exposure of a heat-developable color photographic element, the resulting latent image is e.g.
Development can be accomplished by heating the element in its entirety at a moderately elevated temperature, such as for 300 seconds. As long as the temperature is within the above range, either high or low temperatures can be used by increasing or shortening the heating time. A temperature range of about 110°C to about 160°C is particularly useful. The heating means may be simply a hot plate, an iron, a hot roller or the like. In the present invention, a specific method for forming a color image by thermal development is thermal diffusion transfer of a hydrophilic diffusible dye. For this purpose, a heat-developable color photosensitive material consists of a photosensitive layer () containing at least silver halide, a dye donating substance which is also a reducing agent, and a hydrophilic binder on a support; It consists of a picture tube () that is capable of receiving diffuse and diffusible dyes. The dye-releasing aid may be included in the photosensitive layer () or the image-receiving layer (). Alternatively, a separate means for applying the dye release aid (for example, a breakable pot containing the dye release aid, a roller impregnated with the dye release aid, or a device for spraying a liquid containing the dye release aid) is provided. Good too. The above-mentioned photosensitive layer () and image-receiving layer () may be formed on the same support, or may be formed on different supports. The image-receiving layer () can also be peeled off from the photosensitive layer (). For example, after imagewise exposure of a heat-developable color photosensitive material, uniform heat development can be carried out, and then the image-receiving layer can be peeled off. In another specific method, after imagewise exposure, an image-receiving layer (2) may be superimposed on the photosensitive layer (2), which has been uniformly heat-developed, and the dye may be transferred at a temperature lower than the development temperature. In this case, "lower temperature than the development temperature" includes room temperature, and preferably refers to a temperature from room temperature to about 40° C. lower than the heat development temperature. For example, this corresponds to a heat development temperature of 120°C and a transfer temperature of 80°C. There is also a method in which only the photosensitive layer () is imagewise exposed, and then the image-receiving layer () is superimposed and developed by heating for about one hour. The image receiving layer () contains a dye mordant. Various mordants can be used in the present invention, and a useful mordant can be selected depending on the physical properties of the dye, transfer conditions, other components contained in the photographic material, etc. The mordant used in the present invention is a high molecular weight polymeric mordant. The polymer mordants used in the present invention are polymers containing secondary and tertiary amino groups, polymers having nitrogen-containing heterocyclic moieties, polymers containing these quaternary cation groups, etc., and have a molecular weight of 5,000 to 20,000, particularly 10,000 to 10,000. 50,000. For example, US Patent No. 2548564, US Patent No. 2484430, US Patent No.
Vinylpyridine polymers and vinylpyridinium cationic polymers disclosed in U.S. Patent Nos. 3148061 and 3756814;
Polymer mordants capable of crosslinking with gelatin etc. disclosed in US Pat. No. 3859096, US Pat.
No. 2798063, Japanese Unexamined Patent Publication No. 115228, No. 54-
Aqueous sol-type mordant disclosed in No. 145529, No. 54-126027, etc.; Water-insoluble mordant disclosed in U.S. Pat. No. 3,898,088; U.S. patent
A reactive mordant capable of forming a covalent bond with the dye disclosed in the specification of No. 4168976 (Japanese Unexamined Patent Publication No. 54-137333); furthermore, US Pat. No. 3709690, US Pat. Same No. 3557066,
No. 3271147, No. 3271148, Japanese Patent Application Publication No. 1971-
No. 71332, No. 53-30328, No. 52-155528, No. 53
Examples include mordants disclosed in Japanese Patent No. 125 and No. 53-1024. Other mordants described in US Pat. No. 2,675,316 and US Pat. No. 2,882,156 can also be mentioned. Among these mordants, those that are difficult to move from the mordant layer to other layers within the light-sensitive material layer are preferred; for example,
Preferably used are those that crosslink with the matrix such as gelatin, water-insoluble mordants, and aqueous sol (or latex dispersion) type mordants. Particularly preferred polymer mordants are shown below. (1) Groups that have a quaternary ammonium group and can be covalently bonded to gelatin (for example, aldehyde groups, chloroalkanoyl groups, chloroalkyl groups, vinylsulfonyl groups, pyridinium propionyl groups,
Polymers having vinyl carbonyl groups, alkylsulfonoxy groups, etc.) For example, (2) A reaction product of a copolymer consisting of a repeating unit of a monomer represented by the following general formula and a repeating unit of another ethylenically unsaturated monomer, and a crosslinking agent (for example, bisalkanesulfonate, bisarenesulfonate). R ₂₁ : H, alkyl R ₂₂ : H, alkyl group, aryl group Q: divalent group R ₂₃ , R ₂₄ , R ₂₅ : alkyl group, aryl group,
Alternatively, at least two of R ₂₃ to R ₂₅ may be combined to form a heterocycle. X: Anion (The above alkyl groups and aryl groups include substituted ones.) (3) Polymer represented by the following general formula x: about 0.25 to about 5 mol% y: about 0 to about 90 mol% z: about 10 to about 99 mol% A: Monomer having at least two ethylenically unsaturated bonds B: Copolymerizable ethylenically unsaturated Monomer Q: N, P R ₃₁ , R ₃₂ , R ₃₃ : Alkyl group, cyclic hydrocarbon group, or at least two of R ₃₁ to _{R 33} may be combined to form a ring. (These groups and rings may be substituted.) (4) Copolymer consisting of (a), (b) and (c) (a)

[Formula] or

[Formula]
Water-insoluble polymer having 3 or more R ₄₁ , R ₄₂ , R ₄₃ : Each represents an alkyl group, and the total number of carbon atoms in R ₄₁ to _{R 43} is 12 or more. (The alkyl group may be substituted.) X: Anion Various known gelatins can be used as the gelatin used in the mordant layer. For example, it is also possible to use gelatin manufactured by different methods such as lime-treated gelatin and acid-treated gelatin, or gelatin obtained by chemically modifying the obtained gelatin such as phthalation or sulfonylation. Moreover, if necessary, it can be used after being subjected to desalting treatment. The mixing ratio of the polymer mordant and gelatin of the present invention and the coating amount of the polymer mordant can be easily determined by those skilled in the art depending on the amount of dye to be mordanted, the type and composition of the polymer mordant, and the image forming process to be used. However, the mordant/gelatin ratio is 20/80 to 80/20 (weight ratio), and the amount of mordant applied is
Preferably, it is used at 0.5-8 g/ ^m2 . The image receiving layer ( ) may have a white reflective layer. For example, on top of a mordant layer on a transparent support,
A layer of titanium dioxide dispersed in gelatin can be created. The titanium dioxide layer forms a white opaque layer, and by viewing the transferred color image from the transparent support side, a reflective color image can be obtained. A typical image-receiving material for diffusion transfer is obtained by coating a polymer containing an ammonium salt mixed with gelatin on a transparent support. A transfer solvent can be used to transfer the dye from the photosensitive layer to the image-receiving layer. As the transfer solvent, water and a basic aqueous solution containing sodium chloride, potassium hydroxide, and an inorganic alkali metal salt are used. Furthermore, low-boiling point solvents such as methanol, N,N-dimethylformamide, acetone, and diisobutyl ketone, and mixtures of these low-boiling point solvents and water or basic aqueous solutions are used. The transfer solvent may be used by moistening the image-receiving layer with the solvent, or may be incorporated into the material as crystal water or microcapsules. Example 1 40 g of gelatin and 26 g of kBr are dissolved in 3000 ml of water. The solution is kept at 50°C and stirred. Next, a solution of 34 g of silver nitrate dissolved in 200 ml of water is added to the above solution over a period of 10 minutes. Then, a solution of 3.3 g of KI dissolved in 100 ml of water was added over 2 minutes. The pH of the silver iodobromide emulsion thus prepared is adjusted, and excess salt is removed by sedimentation. Thereafter, the pH was adjusted to 6.0 to obtain a silver iodobromide emulsion with a yield of 400 g. Next, we will describe how to make a gelatin dispersion of a dye-donating substance. 10 g of dye-donating substance 8, 0.5 g of sodium succinate-2-ethyl-hexyl ester sulfonate,
Trigresil phosphate (TCP) 20g
To this, 20 ml of cyclohexanone was added and dissolved by heating to about 60°C. This solution and a 10% solution of gelatin 100
After stirring and mixing with g, disperse with a homogenizer at 10,000 RPM for 10 minutes. This dispersion liquid is called a dispersion of a dye-providing substance. Next, a method for preparing a photosensitive coating will be described. (a) Photosensitive silver iodobromide emulsion 5g (b) Dispersion of dye-providing substance 3.5g (c) A solution of 220mg of guanidine trichloroacetic acid dissolved in 2ml of methanol Add 2ml of water to (a) to (c) above. After the mixture was added and mixed and dissolved by heating, it was coated on a polyethylene terephthalate film to a wet film thickness of 60 μm. After drying this coated sample, it was imagewise exposed for 10 seconds at 2000 lux using a tungsten bulb. Thereafter, it was heated uniformly for 30 seconds on a heat block heated to 150°C. Next, a method for forming an image-receiving material having an image-receiving layer will be described. 10 g of poly(methyl acrylate-co-N,N,N-trimethyl-N-vinylbenzylammonium chloride) (ratio of methyl acrylate and vinylbenzylammonium chloride is 1:1)
100g 10% lime processed gelatin dissolved in 200ml water
mixed evenly. This mixed solution was uniformly applied onto a polyethylene terephthalate film to a wet film thickness of 20 μm. After drying, this sample was used as an image receiving material. After the image-receiving material was immersed in water, the above-mentioned heated photosensitive material was stacked on top of each other so that the film surfaces were in contact with each other. After 30 seconds, the image-receiving material was peeled off from the light-sensitive material, and a negative magenta color image was obtained on the image-receiving material. The density of this negative image was measured using a Macbeth transmission densitometer (TD-504).
As a result of the measurement, the maximum density for green light was 1.75 and the minimum was 0.08. In addition, the gradation of the sensitometric curve is a straight line, with an exposure difference of 10
There was a concentration difference of 1.25 times. Examples 2 to 5 A dye-donating substance instead of the dye-donating substance (8)
(7) Photosensitive material No. 2 was prepared in the same manner as in Example 1 except that 10 g was used. Similarly, dye-donating substance (19) 9.5 g, dye-donating substance (4) 11 g, dye-donating substance (20) 10.5
Photosensitive materials Nos. 3 to 5 were made using G. Using the above photosensitive materials No. 2 to 5, the same treatment as in Example 1 was carried out to obtain a negative color image on the image-receiving material. The measured concentration values for each are shown in the table below.

[Table] Example 6 The same operations and treatments as in Example 1 were performed except that guanidine trichloroacetic acid was not used. As a result, only a slight magenta color image (maximum density 0.25) was obtained. Therefore, we raised the temperature of the heat block to 180℃ and added the photosensitive material to 30℃.
When the film was heated uniformly for a second and the same transfer process as in Example 1 was performed, a negative image with a maximum density of 0.65 and a minimum density of 0.18 was obtained. Example 7 6.5g of benzotriazole and 10g of gelatin in water
Dissolve in 1000ml. The solution is kept at 50°C and stirred. Next, add a solution of 8.5 g of silver nitrate dissolved in 100 ml of water.
Add to the above solution for a minute. Next, a solution of 1.2 g of potassium bromide dissolved in 50 ml of water is added over 2 minutes. The prepared emulsion is precipitated by pH adjustment and removed with excess salt. Then the pH of the emulsion
adjusted to 6.0. The yield was 200g. The photosensitive coating was made of (a) 10 g of a benzotriazole silver emulsion containing photosensitive silver bromide, (b) 3.5 g of the dispersion of the dye-providing substance of Example 2, and (c) 0.25 g of guanidine trichloroacetic acid dissolved in 2 ml of methanol. The operations and treatments were exactly the same as in Example 1 except that a solution was used. As a result, a negative magenta image was obtained on the image receiving material. The maximum concentration was 2.20 and the minimum concentration was 0.14. Example 8 1 as an auxiliary developer in the photosensitive coating of Example 1
-Phenyl-4-methyl-4-oxymethyl-3
-The same operations and treatments as in Example 1 were carried out except for adding 0.4 g of pyrazolidinone. The density of the resulting magenta color image was 1.80 at maximum and 0.12 at minimum. This result is almost the same as in Example 1, indicating that the present invention allows sufficient image formation even without the use of an auxiliary developer. Example 9 In the dye transfer process of Example 1, the image receiving material was immersed in a 0.1N sodium hydroxide solution instead of being immersed in water. As a result, a magenta color image having a maximum density of 2.35 and a minimum density of 0.40 was obtained. Example 10 3-amino-5-benzylthio 1,2,4-
This article describes how to make an emulsion using triazole. water
14g gelatin in a solution of 1000ml and 300ml methanol
and 3-amino-5-benzylthio 1,2,4-
Dissolve 11.3 g of triazole. While maintaining this solution at 50° C. and stirring, a solution prepared by dissolving 8.5 g of silver nitrate in 50 ml of water was added over 5 minutes. After leaving for 5 minutes, 50
1.2 g of potassium bromide dissolved in 5 ml of water
Add in minutes. The temperature of the liquid was lowered to 40°C, and unnecessary salts were removed by a sedimentation method to obtain an emulsion with a yield of 200 g. 10% of this 3-amino-5-benzylthio-1,2,4-triazole silver emulsion containing this photosensitive silver bromide
The same operations and treatments as in Example 7 were performed except that g was used. As a result, a negative magenta image was obtained on the image receiving material. The density of this negative image is up to
2.15, the minimum was 0.14. Preferred embodiments are as follows. 1. A heat-developable color photosensitive material containing at least a photosensitive silver halide, an organic silver salt oxidizing agent if necessary, a hydrophilic binder, and a dye-donating substance represented by () or () on a support. An image forming method comprising transferring the released dye to an image receiving material having a mordant to form a color image. 2. The diffusion transfer type heat-developable color photosensitive material according to claim 1 or claim 1, which contains a reducing agent for a silver halide or organic silver salt oxidizing agent, if necessary. 3. An image forming method according to the claims or item 1 above, characterized in that a dye release aid is contained in the heat-developable color photosensitive material. 4. An image forming method according to the claims or item 1 above, characterized in that a dye release aid is included in the image-receiving material. 5 At least photosensitive silver halide on the support,
In a heat-developable color photosensitive material containing an organic silver salt oxidizing agent, a hydrophilic binder, and a dye-providing substance represented by the formula () or (),
An image forming method comprising releasing a diffusible dye by means of applying a dye-releasing aid and transferring the dye to an image-receiving material having a mordant to form a color image. 6 The Col moiety of the dye-donating substance claimed in the patent is a hydrophilic azo, azomethine, anthraquinone,
naphthoquinone, styryl, nitro, quinoline,
A heat-developable color photosensitive material as claimed in the claims, characterized in that it is a carbonyl or phthalocyanine dye. 7 The dye release aid of items 1, 3, 4, and 5 above is
A heat-developable color photosensitive material characterized by containing a base, a base-releasing agent, or a water-releasing compound. 8. A heat-developable color photosensitive material, wherein the organic silver salt oxidizing agent of item 1 above is a silver salt of a carboxylic acid derivative or a nitrogen-containing heterocyclic compound. 9. A heat-developable color photosensitive material, wherein the hydrophilic binder in the claims is gelatin or a gelatin derivative. 10. The image forming method according to items 1 and 5, characterized in that the released diffusible dye is transferred to an image-receiving material using water or a basic aqueous solution. 11. A heat-developable color photosensitive material, wherein the organic silver salt oxidizing agent of item 8 is a silver salt of a nitrogen-containing heterocyclic compound.

Claims (1)

[Claims] 1. At least photosensitive silver halide on a support,
A heat-developable color photosensitive material having a hydrophilic binder and a dye-donating substance represented by the formula () or () In the formula, G is a hydroxyl group or a group that gives a hydroxyl group by hydrolysis, Col is a dye or a group that gives a dye, R ¹ is an alkyl or aromatic group, X and R ²
each represents a hydrogen atom, an alkyl group, an alkyloxy group, a halogen atom, an acylamino group, or an alkylthio group, and X and R ¹ , X and R ² , or R ¹
and R ² may be linked to form a ring. R ³ represents an alkyl group, an alkyloxy group, a halogen atom, an acylamino group or an alkylthio group,
R ² and R ³ or R ¹ and R ³ may be linked to form a ring.