JPS61159643A - Positive image forming method - Google Patents

Abstract

PURPOSE:To form a positive type dye image in the state of contg. no moisture by subjecting a photosensitive material having a silver halide emulsion layer contg. a dye donative material and internal latent image type silver halide having an uncoupled surface on a base to image exposure then to heating. CONSTITUTION:The silver halide emulsion layer contg at last the dye donative material and the internal latent image type silver halide having the surface which is not preliminarily coupled is provided on the base to form the silver halide photosensitive material. Such silver halide photosensitive material is subjected to image exposure then to a heating treatment, full-surface exposure and development so that the dye formed or released finally in the silver halide emulsion layer by a heating effect is transferred to an image receiving element and the positive image is formed. Thazolium salt, azaindene, etc. are preferably added to the photosensitive silver halide emulsion of the internal latent image type in order to suppress the surface sensitivity as low as possible and to provide the stabler characteristic thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for forming a positive image, and more particularly, the present invention relates to a method for forming a positive image. The present invention relates to a positive image forming method for obtaining a positive dye image by heating a silver halide photosensitive material having a silver emulsion layer.

[Prior Art] Photographic light-sensitive materials using silver halide include, for example, a method using a dye formed by an oxidized color developing agent and a coupler, and a method of obtaining an image by bleaching the dye with silver (silver dye bleaching method). ), or a method used in so-called instant photography in which dyes released by oxidation-reduction are diffuse-transferred using an alkaline processing solution are known.

All of these methods perform image formation using alkaline or acidic processing liquids.

In recent years, compared to these image forming methods, a rapid processing method using dry processing such as heating, which is substantially free of water, has been developed.

As for heat-developable photosensitive materials on which images are formed by heat treatment and their processing methods, U.S. Pat. No. 3,152,904, U.S. Pat.
No. 3.457,075 and Research Disclosure
) No. 17029, June 1978 issue, pages 9-15.

Further, regarding a method of obtaining a color image by thermal development, U.S. Pat. No. 3,531,286 and U.S. Pat. , Belgian Patent No. 4,021,240 and Belgian Patent No. 802,519.

However, this method has the disadvantage that a silver image and a color image after heat development occur simultaneously, making it impossible to obtain a clear color image. In order to solve this problem, some methods further carry out bleach-fixing treatment or silver bleaching using an activator sheet, but these are not preferred.

On the other hand, a method is known in which a pigment is liberated by heat development using a pigment silver salt, but the separation between the exposed area and the unfogged area is poor, making it impossible to obtain a clear image.

Furthermore, methods for forming color images using leuco dyes are described, for example, in U.S. Pat. No. 3,985,565 and U.S. Pat. No. 4,022,617. It has the disadvantage that it is difficult to inject into the body and gradually discolors.

On the other hand, regarding the method of forming a positive dye image, for example, Research Disclosure (Research Disclosure)
Disclosure) No. 14433, 19
April 1976 issue, pages 30-32, issue 15227,
December 1976 issue, pages 14-15, U.S. Patent No. 4
, 235,957, etc., a heat-sensitive silver dye bleaching method is 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 dye image is free from free particles that coexist during long-term storage. It had the disadvantage of being gradually reductively bleached by silver or the like.

[Object of the Invention] Accordingly, a first object of the present invention is to provide a new method for forming a positive dye image by heating in a substantially water-free state.

A second object of the present invention is to provide a method for obtaining clear positive dye images by a simple method.

[Structure of the Invention] The object of the present invention is to provide a silver halide emulsion layer having a silver halide emulsion layer on a support containing at least a dye image-providing substance and an internal latent image type silver halide whose surface has not been fogged in advance. A step of exposing the light-sensitive material imagewise, heating it, exposing the whole surface to light, developing it, and transferring the dye imagewise generated or released in the silver halide emulsion layer to the image-receiving element by the action of heating. This was achieved by a positive image forming method consisting of:

[Specific Structure of the Invention] Regarding the internal latent image type silver halide whose surface is not coupled in advance to be used in the present invention, for example, U.S. Pat.
No. 592,250, No. 3,206,313, No. 3.3
No. 17,322, No. 3,511,662, No. 3,
No. 447,927, No. 3,761,268, No. 3,7
As described in No. 03,584 and No. 3,736,140, silver halide grains have a higher sensitivity inside the grain than the surface sensitivity. The method for producing silver halide emulsions containing these internal latent image type silver halides is, for example, first Ao
A method in which Cf1 grains are created and then bromide or a small amount of iodide is added to it to perform halide exchange, or a method in which the center core of chemically sensitized silver halide is converted to a non-chemically sensitized halogenated grain. Many methods are known, including a method of coating with silver, or a method of 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 Nos. 3,271.157 and 3,447,92
7 and 3,531,291, or silver halide emulsions having silver halide grains containing polyvalent metal ions, or U.S. Pat. No. 3,761,2.
A silver halide emulsion in which the grain surface of silver halide grains containing a dopant is weakly chemically sensitized as described in No. 76, or JP-A-50-8524, JP-A-50-38525
Silver halide emulsions comprising grains having a laminated structure as described in No. 1983 and No. 53-2408, and other JP-A Nos. 52-156614 and 55-127549.
These include silver halide emulsions described in No.

The silver halide emulsion containing internal latent image type silver halide used in the present invention (hereinafter referred to as internal latent image type silver halide emulsion) has a maximum density that can be achieved when developed with an "internal type" developer. is greater than the maximum density achieved when developed with a "surface-type" developer.

The internal latent image type emulsion suitable for the present invention is produced by coating the silver halide emulsion on a transparent support, exposing it to light for a fixed time of 0.01 to 1 second, and using the "internal type" developer described below. When the silver halide emulsion exposed in the same manner as above was developed in A for 3 minutes at 20°C, the maximum density measured by a normal photographic density measuring method was determined by the following "surface type" development 8! It has a density that is at least 5 times greater than the maximum density obtained when developed in B for 4 minutes at 20°C.

[Developer A] Hydroquinone 15 Q Metol is g Anhydrous 1iI
IiI! Sodium 50g Potassium bromide 10g Sodium hydroxide
25 (1 Sodium thiosulfate
201) Add water
1y [Developer B Co p-hydroxyphenylglycine 10 Q Sodium carbonate ioo a Add water 11 Amount of internal latent image type silver halide used in the present invention Lt, silver dioxide 111 L4
The range is preferably 0.001+/l” to 100 Mm, more preferably o, osg/■2 to 50 g/■
The range is 2.

The internal latent image type silver halide used in the present invention includes any halogenated silver halide such as silver chloride, silver chlorobromide, silver chloroiodide, silver bromide, silver iodobromide, silver chloroiodobromide, and silver iodide. I can give you silver.

The grain size of the above silver halide is such that the average grain size is 0.
．． 001μ intestine to 2μ− is preferable, more preferably 0
．． 01 μm to 1 μm.

Two or more types of silver halides having different sizes and/or halogen compositions may be used in combination.

In the present invention, the average grain size refers to the grain diameter for spherical or approximately spherical silver halide grains, the principal diameter for cubic grains, and the same area as the projected area for silver halide grains other than spherical or cubic grains. The diameter of a circle is expressed as an average based on particle size and projected area, respectively.

In the silver halide photosensitive material according to the present invention, by heating after image exposure or simultaneously with image exposure, an oxidation-reduction reaction occurs between the photosensitive silver halide and the reducing agent using the photosensitive silver halide as a catalyst. It is preferable to use a heat-developable photographic material that has a step of causing heat development, that is, is capable of heat development.

The heat-developable silver halide photosensitive material (hereinafter referred to as “
"Heat-developable material") is an internal latent image type silver halide whose surface is not previously coupled on a support;
It has a silver halide emulsion layer containing a dye image-forming substance that chemically participates in this reaction to form or release a dye along with a silver image in the unexposed area when the silver halide is reduced to silver by heating. If the heat-developable material is heat-developed, the produced or released dye and the unreacted dye image-providing substance coexist, which is not preferable for obtaining a clear dye image.

Therefore, in the present invention, it is preferable that the dye imagewise generated or released by heat development is a diffusible dye, and by moving this diffusible dye to the dye-receiving layer, a clear dye with excellent photographic properties can be produced. You can get the image. This step is the "transfer step" in the present invention.

The present invention is characterized by the internal latent image type silver halide whose surface is not fogged in advance as described above, and when the silver halide is reduced to silver by heating, the unexposed area is chemically related to this reaction. After imagewise exposure to a heat developable material having a silver halide emulsion layer containing a silver image and a dye-providing substance that generates or releases a diffusible dye, under or after heating,
The entire surface is exposed to light, followed by heat development, and the diffusible positive dye image generated or released in the unexposed area is transferred to the dye-receiving layer.

The dye-providing substance used in the present invention chemically participates in this reaction when internal latent image type silver halide and/or organic silver salt used in combination as necessary is reduced to silver under heated conditions. A compound that produces or releases a non-diffusible or diffusible dye. This reaction of producing or releasing a non-diffusible or diffusible dye is caused by the formation of capri nuclei in the internal latent image type silver halide when the internal temperature type direct positive emulsion is subjected to imagewise exposure, under heating, or after being exposed to full-scale exposure after heating. This internal latent image type silver halide undergoes an oxidation-reduction reaction with a reducing agent or a reducible dye-donating substance. (2) A reaction in which a reducing dye-donating substance is oxidized and a diffusible dye is released, etc. In particular, reactions (1) and (2) When an image-receiving material comprising an image-receiving layer suitable for receiving a diffusible dye is brought into close contact with and superimposed on a heat-developable color photosensitive material having the dye-providing substance under heating, the dye is added to the image-receiving layer. A positive image is obtained.

On the other hand, (3) the internal latent image type silver halide and the reducing agent undergo an oxidation-reduction reaction to form a silver image, and then the remaining reducing agent and the dye-donating substance, which is non-diffusible at high temperatures, undergo an oxidation-reduction reaction. The dye-donating substance is reduced and releases the dye, for example, the dye-donating substance described in JP-A-59-154445;
Alternatively, a dye-donating substance that releases a diffusible dye at high temperature is oxidized and becomes non-diffusible, for example, in JP-A-59-15.
The dye-donating substances described in No. 2440 can also be used. However, in that case a dye image is obtained which is in a negative relationship to the silver image.

Examples of the dye-providing substance described in (1) above include JP-A No. 57-186744, JP-A No. 58-79247, JP-A No. 58-123533, JP-A No. 58-149046, JP-A No. 58-149047, JP-A No. 59-12431. No. 5
No. 9-48765, No. 59-159159, No. 59-
No. 424339, No. 59-181345, Patent application 1982
-109293J8, No. 59-181604, No. 59
-182507, 59-179657, 59-
The compound described in No. 182506 is used.

This compound is represented by the general formula A-L-8, where A has a substrate such as active methylene, active methine, phenol residue, naphthol residue, etc., which is bound to the oxidized form of the reducing agent through oxidative coupling. It represents a coupler core, and L represents a linking group such that the bond between A and L is cleaved when A reacts with the oxidized product of the reducing agent.

When the carrier core A having the above-mentioned substrate is a dye-donating substance that has the function of releasing a diffusible dye by reacting with an oxidized form of a reducing agent, B represents a dye for forming a dye image or a dye precursor; The carrier core preferably has the ballast group to prevent the dye-donating substance itself from diffusing into other layers.

On the other hand, in dye-donor materials that react with the oxidized form of the reducing agent to form a diffusible dye, B is a polymer derived from a ballast group or vinyl monomer that is large enough to prevent coupler diffusion. It is preferred that the carrier core A does not have anything that would impede the diffusion of the formed dye.

Examples of the dye-donating substance shown in (2) above include JP-A-57-179840M, JP-A No. 59-48764, JP-A No. 59-60434, JP-A No. 59-65839, JP-A No. 59-65839, and JP-A No. 59-65839.
No. 71046, No. 59-87450, No. 59-887
The compounds described in No. 30 and No. 59-165055 are used.

This compound is represented by the general formula R-8oλ-. R represents a reducing substrate that can be oxidized by silver halide,
D represents a dye for forming a dye image or a dye precursor.

Preferred reducing substrates are, for example, disclosed in JP-A-57-17984.
0, US Pat. No. 58-58543, and US Pat. No. 59-48164, as well as US Pat.
No. 55,428, No. 3,928,312, No. 4.
No. 076.529, No. 4,135,929, No. 4
, 258,120, 4,198,235, 4,273,855, 4,149,892, JP 53-46730, 56-12642, 5
．． No. 6-16130, No. 56-16131, No. 57-
Reducing substrates disclosed in No. 650, No. 57-4043, and No. 57-85055 are used.

The amount of the dye-providing substance used in the present invention is not limited, and depends on the type of the dye-providing substance, whether it is for military use, or whether two or more are used in combination, or whether the photographic constituent layer of the light-sensitive material of the present invention is a single layer or two or more layers. You can decide depending on whether there are multiple layers, etc.
For example, the amount used is o, oos per 1m of support.
g to 10 g, preferably 0.1 g to 5.0 Q can be used.

Among the dye-providing substances used in the present invention, preferred examples include those described in detail in JP-A-59-1 mentioned above.
24339 and 59-181345, a hydrophilic group such as a sulfo group or a carboxy group, a hydrophobic ballast group with a large molecular weight, a hydrophobic polymer residue, etc., in the heat-developable photosensitive layer. It is preferable that the dye has a group that is immobilized by heat development, and it is preferable that the dye formed or released by heat development is heat transferable.

The dye-providing substance particularly advantageously used in the present invention is a dye-forming compound represented by the following general formula (1).

General formula (1) Here, X is a hydrophobic coupler residue, and this group includes groups such as sulfo group, carboxyl group, thiosulfo group, etc. that immobilize these dye-donating substances in the heat-developable photosensitive layer. do not have. Y is a group that can be separated from the coupler by a coupling reaction, and may be a large hydrophobic group such as a sulfo group, carboxyl group, thiosulfo group, etc.
For example, an alkyl group having 8 or more carbon atoms, an alkyl group having 4 or more carbon atoms.

It has a group that immobilizes the dye-providing substance in the heat-developable photosensitive layer, such as a hydrophilic or hydrophobic polymer residue. These dye-providing substances generate hydrophobic heat-transferable dyes through a coupling reaction with an oxidized product of a reducing agent formed by heat development. For example, X is represented by the following general formulas (2) to (6). ) is preferable.

The following is a blank general formula (3) General formula (4) In the formula, R,, R2, R3 and Rp are a hydrogen atom, a halogen atom (preferably a chlorine atom, a bromine atom, an iodine atom), an alkyl group (preferably a carbon atom), respectively. Numbers 1-24
an alkyl group such as methyl, ethyl, butyl,
Examples include groups such as t-octyl, n-dodecyl, n-pentadecyl, and cyclohexyl, and examples of alkyl groups substituted with aryl groups, such as phenyl groups, may include benzyl groups and phenethyl groups. ), substituted or unsubstituted aryl groups (e.g. phenyl, naphthyl, tolyl, methyl), acyl groups (e.g. acetyl, tetradecanoyl, pivaloyl, substituted or unsubstituted benzoyl), alkyloxy Carbonyl group (e.g. methoxycarbonyl group, benzyloxycarbonyl group), aryloxycarbonyl group (e.g. phenoxycarbonyl group, p-tolyloxycarbonyl group, α-naphthoxycarbonyl group), alkylsulfonyl group (e.g. methylsulfonyl group), aryl Sulfonyl group (e.g. phenylsulfonyl group), carbamoyl group (
For example, a substituted or unsubstituted alkylcarbamoyl group,
Methylcarbamoyl group, butylcarbamoyl optionally substituted phenoxyalkylcarbamoyl group,
Specifically, 2,4-di-t-aminophenoxybutylcarbamoyl group, substituted or unsubstituted phenylcarbamoyl group, specifically 2-dodecyloxyphenylcarbamoyl group, etc.), substituted or unsubstituted acylamino group (
For example, n-butylamide, laurylamide, optionally substituted β-phenoxyethylamide group, phenoxyacetamide group, substituted or unsubstituted benzamide group, methanesulfonamideethylamide group, β-methoxyethylamide group), alkoxy group ( Preferably 1 carbon atom
~18 alkoxy groups, such as methoxy, ethoxy, octadecyloxy groups), sulfamoyl groups (such as methylsulfamoyl, n-dodecylsulfamoyl, substituted or unsubstituted phenylsulfamoyl,
Specifically, it represents a dodecylphenylsulfamoyl group), a sulfonylamino group (for example, a methylsulfonylamino group, a tolylsulfonylamino group), or a human O-oxyl group. Further, R/ and R2 may be combined with each other to form a saturated or unsaturated 5- to 6-membered ring.

Further, R5, R6 and R/7 are a hydrogen atom, a halogen atom (preferably a chlorine atom, a bromine atom, an iodine atom), an alkyl group (preferably an alkyl group having 1 to 22 carbon atoms, such as a methyl group or an ethyl group), Alkoxy group (preferably an alkoxy group having 1 to 2 carbon atoms, e.g. methoxy group, ethoxy group), substituted or unsubstituted alkylamide group (e.g. laurylamide group, etc.), or phenoxyalkylamide group which may be roughly substituted (for example, alkyl-substituted phenoxyacetamide groups, etc.), substituted or unsubstituted arylamide groups, etc.

Furthermore, R8 is an alkyl group (preferably having 1 to 1 carbon atoms)
24 alkyl groups, such as methyl, butyl, heptadecyl groups), alkoxy groups (preferably 1 to 1 carbon atoms),
18 alkoxy groups, such as methoxy groups, ethoxy groups,
octadecyloxy group), arylamino group (e.g. anilino group, and anilino group substituted with a substituent such as a halogen atom, an alkyl group, an amide group, or an imide group)
, substituted or unsubstituted alkylamide groups (e.g. laurylamide group, optionally substituted phenoxyacetamide group, phenoxybutanamide group), substituted or unsubstituted arylamide groups (e.g. benzamide group, further halogen atom, alkyl group) , a benzamide group substituted with an alkoxyamide group, etc.).

Furthermore, R9 is an alkyl group (preferably one having 1 to 1 carbon atoms)
8 alkyl group), substituted or unsubstituted aryl group (
For example, phenyl group, tolyl group, methoxyphenyl group, etc.)
Hail.

In general, Rlo represents an arylamino group (for example, an anilino group, an anilino group further substituted with a halogen atom, an alkyl group, an alkoxy group, an alkylamido group, an arylamido group, an imido group, etc.).

These R1 substituents of the coupler residue represented by
~RIO is preferably an alkyl group having 8 or more carbon atoms and/or carbon so as not to interfere with the thermal transferability of the formed dye! +
11 [It is preferable to have an aryl group having an alkyl group having 4 or more children.

In the general formula (1), Y is a hydrophilic group such as a sulfo group or a carboxy group, or a group represented by -JZ (herein, J
represents a divalent bonding group, and Z represents a substituted or unsubstituted alkyl group or aryl group.

), and more specifically, the divalent bonding group represented by J is -o-, -s-, -oco-.

Examples include So, -0-SOz-, and the alkyl or aryl group represented by Z is preferably an alkyl or aryl group substituted with a hydrophilic group such as a sulfo group or a carboxyl group. Among them, an alkyl group substituted with an alkylcarbamoyl group or an arylcarbamoyl group which may be further substituted, an alkyl group substituted with a carbalkoxy group, a carboaryloxy group, an alkyl group substituted with a halogen atom, and an alkyl group substituted with a halogen atom. an aryl group substituted with an optionally substituted alkylamide group, an alkylsulfonamide group, an arylamide group, an arylsulfonamide group, an optionally substituted alkylcarbamoyl group, an alkylsulfamoyl group, an arylcarbamoyl group, an arylsulfonamide group; Moyl group, an aryl group substituted with a substituted or unsubstituted alkyl group having 1 to 22 carbon atoms, and an aryl group substituted with an optionally substituted alkyl group having 1 to 22 carbon atoms, number of carbon atoms Particularly preferred are aryl groups substituted with 1 to 22 alkylamino groups, and aryl groups substituted with halogen atoms, hydroxyl groups, sulfo groups, carboxy groups, sulfamoyl groups, and the like.

Active point substituents such as those represented by Y as detailed above include hydrophilic groups such as sulfo groups, carboxyl groups, and carbon atoms to render the entire coupler molecule thermally immobilized within the contained layer. Number 8J: preferably has a group that immobilizes the dye-donating substance, such as an alkyl group on X or an aryl group having an alkyl group having 4 or more carbon atoms,
More preferably, these hydrophilic groups contain an alkyl group having 8 or more carbon atoms, or an aryl group having an alkyl group having 4 or more carbon atoms.

Among the above-mentioned hydrophilic groups, particularly preferred are sulfo group, sulfino group, sulfeno group, thiosulfo group,
dithiosulfo group, droxysulfonyloxy group, hydroxysulfonylthio group, carboxyl group, thiocarboxy group, etc.
It is stated in No. 5.

Also, Japanese Patent Application Publication No. 58-149047, Patent Application No. 1987-1092
No. 93, No. 59-179657, No. 59-18160
No. 4, No. 59-182507, No. 59-182506
It is also preferable to use a coupler having a polymer chain as a ballast group as described in the above.

The dye-providing material of the present invention is disclosed in U.S. Pat. No. 2,322,027.
It can be introduced into the layer of the photosensitive material by a known method such as the method described in No. In that case, the following high boiling point organic solvents and low boiling point organic solvents can be used.

For example, phthalic acid alkyl esters (diptyl phthalate, dioctyl phthalate, etc.), phosphoric acid esters (diphenyl phosphate, triphenyl phosphate, tricresyl phosphate, dioctyl butyl phosphate), citric acid esters (e.g. acetyl citrate, tributyl), benzoic acid esters (octyl benzoate), alkylamides (e.g. diethyl laurylamide), fatty acid esters (e.g. dibutoxyethyl succinate, dioctyl azelate), trimesic acid esters (e.g. trimenosun tributyl), etc.; Dissolved in an organic solvent at a temperature of 30°C to 160°C, such as lower alkyl acetates such as ethyl acetate and butyl acetate, ethyl propionate, secondary butyl alcohol, methyl isobutyl ketone, β-ethoxyethyl acetate, methyl cellosolve acetate, cyclohexanone, etc. It is then dispersed into hydrophilic colloids. The above-mentioned high boiling point organic solvent and low boiling point organic solvent may be used in combination.

Also, Japanese Patent Publication No. 51-39853, Japanese Patent Publication No. 51-599
The dispersion method using a polymer described in No. 43 can also be used.

The amount of the high boiling point organic solvent used in the present invention is preferably 109 or less, more preferably 5 g or less per 1 g of the dye-providing substance used.

In the present invention, the optical fogging method that provides full-surface exposure used in the full-surface exposure process is based on the formation of fog nuclei through photodecomposition of silver halide, so the type and characteristics of the silver halide used are Alternatively, it is preferable to change the appropriate exposure intensity or exposure m depending on the number of layers or layer structure of the silver halide photosensitive material. For example,
No. 12709 discloses a method of uniformly exposing the entire surface of the heat-developable photosensitive material according to the present invention to low-intensity light during the heat development process. A good direct positive image with high maximum density and low minimum density is obtained.

However, after image exposure, a heat-developable multicolor light-sensitive material consisting of two or more previously unfogged internal latent image type silver halide emulsion layers, each of which is not sensitive to the same wavelength region, on a support is thermally developed. As mentioned above, under the condition that the entire surface is uniformly exposed to light of low intensity during the process, it is difficult to obtain satisfactory image characteristics in all of the formed images of the plurality of layers. When such an internal latent image type direct positive color heat developable multicolor photosensitive material is developed using a light power pre-processing method,
In order to obtain good positive color images, exposure to a limited range of relatively low intensity light is necessary.

That is, a heat-developable multicolor photosensitive material consisting of two or more uncoupled internal latent image type silver halide emulsion layers, each of which is not sensitive to the same wavelength region, on a support is used to directly obtain a positive image using a photofogging method. In this case, good positive color images are obtained by providing a total exposure in which the ratio of the photographic intensity of the total exposure to each of the silver halide emulsion layers is preferably not greater than 6.

The photographic strength here refers to the strength that can exert a photographic effect on a silver halide emulsion layer that has been fully exposed, and is determined relative to each silver halide emulsion layer. can do. Photographic strength is
It depends on the energy distribution of the entire surface exposure and the spectral sensitivity distribution of each silver halide emulsion layer.

The photographic intensity ratio is determined, for example, by the method described in JP-A-58-70223.

The light source for full-surface exposure used in the present invention can be any one as long as it can be adjusted so that the relative photographic intensity ratios for each layer of the silver halide color light-sensitive material used are preferably not greater than 6. You can also use anything. For example, tungsten lamps, fluorescent lamps, halogen lamps,
Xenon lamps, mercury lamps, sunlight, etc. can be used, and
They can also be used in combination.

The ratio of the photographic intensities of the entire surface exposure can be varied in a commonly known manner so as to satisfy the above conditions. The energy distribution of the light source itself can be changed, and filters such as color correction filters and color density conversion filters can also be used.

The entire surface exposure can also be performed using multiple light sources. In one preferred example, separate light sources for blue light, green light, and red light can be used to provide full-surface exposure. When a plurality of light sources are used, the entire surface exposure time may be the same for the plurality of light sources, or may be exposed at different times.

The entire surface exposure of the present invention can also be carried out by the method described in Japanese Patent Laid-Open No. 127587/1983, in which light fogging is carried out while increasing the exposure illuminance.

In the present invention, the entire surface is exposed after the image exposure of the photographic light-sensitive material.
This is done during heating at a moderately elevated temperature, such as from about 0.5 seconds to about 300 seconds at 0° C., or after heating.

In the heat developable material used in the present invention, development is caused by heating, but after image exposure of the heat developable material,
The photosensitive layer is heated to a temperature within the above range, and the temperature in the photosensitive material becomes constant, and the entire surface is exposed immediately before or simultaneously with the start of development. Alternatively, after heating at a low temperature at which development of the heat-developable material does not occur, the density may be maintained as it is or after the density has been lowered to room temperature, the entire surface may be exposed to light, and the temperature may be subsequently increased to a temperature at which development begins. In this case, the time until the entire surface is exposed can be arbitrarily selected as long as the heat-sensitive material undergoes a heating step.

It is preferable to carry out the heating and full-surface exposure at the same time. In this case, the full-face exposure is performed when the heat-developable material is heated and the temperature within the photosensitive layer containing the internal latent image type silver halide emulsion reaches the heating temperature. From the viewpoint of photographic properties, it is preferable to perform n-light exposure on the entire surface when the photosensitive layer is in a dry state containing substantially no water, and it is preferable to perform n-light exposure on the entire surface when at least about 1 second has elapsed from the start of heating the heat developable material. is preferable.

As long as the temperature applied to the heat developable material is within the above range, either high or low temperatures can be used by increasing or shortening the heating time, but in particular about 110°C to about 160°C.
temperature ranges are useful.

Heating means in the heating process include heating by passing between hot plates or contacting with hot plates, heating by rotating a hot roll or drum while heating, heating by passing through a heated cavity, and other heating methods such as rollers, belts, or Heating by placing the guide member along a heat source can be used.

Furthermore, heating may be performed by high frequency heating or laser beam.

Also, as described in Japanese Patent Application Laid-Open No. 59-77442,
The heat developable material may have a conductive heat-generating layer made of a conductive material such as graphite, carbon black, or metal that heats the photosensitive layer by generating heat when energized from the electrodes, in which case: 1. Photosensitive material After exposing the material, electricity is applied to the conductive heating layer of the heat-developable material to heat it and perform full II exposure to complete development and transfer.

2. After exposing the photosensitive layer of a heat-developable material having an internal latent image type direct positive silver halide emulsion and a conductive heat-generating layer, electricity is applied to the conductive heat-generating layer to the extent that development does not substantially proceed. While heating or after heating, the entire surface is exposed to light to release the diffusible dye from the unexposed area, and then the image-receiving material is superimposed and the generated dye is moved and transferred to the image-receiving material.

3. After exposure, the conductive heating layer of the heat developable material is superimposed on the image-receiving material and heated to such an extent that the dye is not substantially released.
Next or simultaneously, the entire surface of the photosensitive layer is exposed to actinic light, and then heated again to generate a diffusive dye in the unexposed areas, and the diffusible dye generated in the unexposed areas is transferred and transferred to the image-receiving material. Then, the image-receiving material is peeled off from the sensitive material to obtain a color positive image.

In the present invention, at least a dye-providing substance, a photosensitive layer having an internal latent image type silver halide emulsion whose surface has not been fogged in advance, and a dye-receiving layer to which a generated or released dye is transferred are formed on the same support. Alternatively, they can be formed on separate supports.

The dye-receiving layer and photosensitive layer can also be peeled off.

For example, after image exposure, the entire surface is exposed while being heated, and further heating is continued or heat development is carried out at a high temperature, so that the dye generated or released along with the silver image in the unexposed area is diffused and transferred from the photosensitive layer to the dye image-receiving layer. , and then the dye-receiving layer or photosensitive layer can be peeled off. In addition, when a photosensitive material with a photosensitive layer coated on a support and an image receiving material with a dye-receiving layer coated on a support are formed separately, the photosensitive material is imagewise exposed and heated uniformly, and then the entire surface is coated. After exposure to light and heat development, a silver image is produced or released from the dye-providing substance in the unexposed area by the action of heating, and then an image-receiving material is overlaid and a diffusible dye is produced or released in the photosensitive layer. The dye can be transferred to the receiving layer.

Also, only the photosensitive material is exposed imagewise and heated uniformly, and then
The image-receiving materials may be overlapped and exposed to light over the entire surface, followed by heat development.

Furthermore, only the light-sensitive material may be imagewise exposed, and then the image-receiving material is superimposed and uniformly heated, and then the entire surface is exposed and the dye is diffused and transferred to the dye-receiving layer by heat development.

In addition, in the case of a close-contact body in which the photosensitive material and the image-receiving material are integrated in advance, image exposure is performed through one of the supports of both materials, and the subsequent steps are performed to obtain a positive dye image on the image-receiving material. It's okay. Image exposure or full-surface exposure after heating is performed from the front surface (photosensitive layer side) or rear surface of the photosensitive material.

When image exposure or whole surface exposure after heating is performed through one support of the adherent body, the support is preferably transparent, but the support is not necessarily limited to a transparent support as long as the exposure layer is included.

When the surface of the light-sensitive material and the dye-receiving surface of the dye-receiving material are brought into close contact with each other and heated after image exposure, or after heating at the same time as image exposure and full-surface exposure, the heating is applied only to the diffusion and movement of the dye. The heating temperature and heating time can be set independently of the heating for development.

When this method is employed, it is preferable that the heating for development completes the reaction for development within a short period of time so as not to contribute to the diffusion and movement of the dye as much as possible. On the other hand, the heating to transfer the image-wise released dye to the dye-receiving layer should be kept as low as possible within a reasonable transfer time so as not to cause a thermal reaction in the unexposed areas. preferred for obtaining.

In the positive image forming method of the present invention, the diffusion movement of the dye produced or released in the photosensitive layer may start simultaneously with the production or release of the dye, or may occur after the production or release of the dye is completed. Therefore, the heating for the diffusion and movement of the dye may be performed after the heat development or at the same time as the heat development. Simultaneously with heat development,
This means that the heating for development also acts as heating for the diffusion and movement of the produced or released dye.

an optimum temperature for imparting capri nuclei to the surface of internal latent image type silver halide by full-surface exposure during or after heating;
Since the optimum temperature for development, the optimum temperature for dye diffusion and the heating time required for each are not necessarily the same, it is preferable to set the temperatures independently.

Preferred embodiment (a) of the present invention is one in which an organic silver salt coexists with internal latent image type silver halide that has not been fogged in advance, and as the organic silver salt, in the presence of photosensitive silver halide, Temperature 80°C or higher, preferably 10°C
It is a relatively light-stable, colorless, white, or light-colored silver salt that reacts with a reducing agent to form a silver image when heated above 0°C.

Examples of organic silver salts that can be preferably used in the photosensitive material of the present invention include Japanese Patent Publication No. 43-4924, Japanese Patent Publication No. 44-26582,
No. 4518416, No. 45-12700, No. 45-
No. 22185 and JP-A-49-52626, JP-A No. 52
-31728, 52-13731, 52-14
No. 1222, No. 53-36224, No. 53-3622
Publications, U.S. Patent No. 3,330,633, U.S. Patent No. 4,
Silver salts of aliphatic carboxylic acids described in specifications such as No. 168.980, such as silver laurate, silver myristate, silver valmitate, silver stearate, silver arachidonate,
Silver behenate, etc., aromatic carboxylic silver, such as silver benzoate, silver phthalate, etc., silver salts with imino groups, such as silver benzotriazole, silver saccharin, silver phthalazinone, silver phthalimide, etc., mercapto group or thione group. Silver salts of compounds having the following, such as silver 2-mercaptobenzoxazole, silver mercaptooxadiazole, silver mercaptobenzothiazole, silver 2-mercaptobenzimidazole, silver 3-mercapto-7enyl-1,2,4-triazole, and others. Examples include 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene silver, 5-methyl-7- and droxy-1°2.3.4.6-pentazaindene silver, and the like.

Also, Ro 16966, Ro 16907, British Patent No. 1,
It is also possible to use silver compounds such as those described in No. 590.956 and No. 1,590,957. Among these, silver salts having an imino group such as benzotriazole silver salts are preferred, and examples of benzotriazole silver salts include alkyl-substituted benzotriazole silvers such as methylbenzotriazole silver, e.g. bromo-benzotriazole silver, Halogen-substituted benzotriazole silver such as chlorobenzotriazole silver, for example amido mono-substituted benzotriazole silver such as 5-acetamidobenzotriazole silver, and British Patent Nos. 1,590,956 and 1,590,951. Compounds described in the specification, such as N-ra, -chloro-4-N (3,5-dichloro-
4-hydroxyphenyl)imino-1-oxo-5-methyl-2,5-cyclohexadien-2-yl]-5-
Rubamoylbenzotriazole silver salt, 2-benzotriazole-5-ylazo-4-methoxy-1-naphthol silver salt, 1-benzotriazol-5-ylazo-2-
Naphthol silver salt, N-benzotriazol-5-yl-
Examples include 4-(4-dimethylaminophenylazone benzamide silver salt).

Further, nitrobenzotriazoles represented by the following general formula (7) and benzotriazoles represented by the following general formula (8) can be advantageously used.

jJ, general formula (7) where R1+ represents a nitro group, R7,- and R/
3 may be the same or different, and each halogen atom (
(e.g. chlorine, bromine, iodine), hydroxy group, sulfo group or its salt (e.g. sodium salt, potassium salt, ammonium salt), carboxy group or its salt (e.g. sodium salt, potassium salt, ammonium salt), nitro group, cyano group , or a carbamoyl group, sulfamoyl group, alkyl group (e.g. methyl group, ethyl group, propyl group), alkoxy group (e.g. methoxy group, ethoxy group), aryl group (e.g. phenyl group), each of which may have a substituent. It represents an amino group, 马 represents O-2, and n represents 0 or 1. Further, examples of substituents for the carbamoyl group include a methyl group, ethyl group, acetyl group, etc., and examples of substituents for the sulfamoyl group include a methyl group, an ethyl group, an acetyl group, etc. Examples of substituents for alkyl groups include carboxy groups and ethoxycarbonyl groups; examples of substituents for aryl groups include sulfo groups and nitro groups; examples of substituents for alkoxy groups include carboxy groups and ethoxycarbonyl groups. and substituents for the amine group include, for example, an acetyl group, a methanesulfonyl group, and a hydroxy group.

The compound represented by the general formula (7) is a silver salt of a benzotriazole derivative having at least one nitro group, and specific examples thereof include the following compounds.

For example, silver 4-nitrobenzotriazole, silver 5-nitrobenzotriazole, silver 5-nitro-6-chlorobenzotriazole, silver 5-nitro-6-methylbenzotriazole, silver 5-nitro-6-methylbenzotriazole, silver Nitro-7-phenylbenzotriazole silver, 4
-Hydroxy-5-nitrobenzotriazole silver, 4-
Hydroxy-7-nitrobenzotriazole silver, 4-hydroxy-5,7-sinitropenzotriazole silver, 4
-Hydroxy-5-nitro-6-chlorobenzotriazole silver, 4-hydroxy-5-nitro-6-methylbenzotriazole silver, 4-sulfo-6-di, trobenzotri7zole silver, 4-hydroxy-6-nitro Silver benzotriazole, 5-carboxy-6-nitrobenzotriazole silver, 4-carbamoyl-6-nitrobenzotriazole silver, 4-sulfamoyl-6-nitrobenzotriazole silver, 5-carboxymethyl-6-nitrobenzotriazole silver , 5-hydroxycarbonylmethoxy-
Silver 6-nitrobenzotriazole, Silver 5-nitro-7-diatubenzotriazole, Silver 5-amino-6-nitrobenzotriazole, Silver 5-nitro-7-(p-nitrophenyl)benzotriazole, 5,7- Ginito o-6
-Methylbenzotriazole silver, 5,7-dinitro-6
-chlorobenzotriazole silver, 5,7-dinitro-6
-Medoxybenzotriazole silver, etc. can be mentioned.

General formula (8) In the formula, R74 is a hydroxy group, a sulfo group, or a salt thereof (e.g., sodium salt, potassium salt, ammonium salt)
, a carboxy group or a salt thereof (e.g., sodium salt, potassium salt, ammonium salt), a carbamoyl group which may have a substituent, and a sulfamoyl group which may have a substituent, and R79 represents a halogen atom (e.g., chlorine , bromine, iodine), hydroxy group, sulfo group or its salt (e.g. sodium salt, potassium salt, ammonium salt), carboxy group or its salt (e.g. sodium salt, potassium salt, ammonium salt), nitro group, cyan group, or Alkyl groups (for example, methyl, ethyl, propyl), aryl groups (such as
phenyl group), alkoxy group (eg methoxy group, ethoxy group) or amino group, p represents 1 or 2, and Q represents an integer of O to 2.

Further, examples of substituents for the carbamoyl group in R and + include methyl, ethyl, acetyl, etc., and examples of substituents for sulfamoyl include methyl, ethyl, acetyl, etc. I can give it to you. Furthermore, as a substituent for the alkyl group in R, for example, a carboxy group, an ethoxycarbonyl group, etc., as a substituent for an aryl group, for example, a sulfo group, a nitro group, etc., and as a substituent for an alkoxy group, for example, a carboxy group. , an ethoxycarbonyl group, etc., and examples of substituents for the amino group include an acetyl group, a methanesulfonyl group, a hydroxy group, and the like.

Specific examples of the organic silver salt represented by the general formula (8) include the following compounds.

For example, silver 4-hydroxybenzotriazole, silver 5-hydroxybenzotriazole, silver 4-sulfobenzotriazole, silver 5-sulfobenzotriazole, silver benzotriazole-4-sodium sulfonate, silver benzotriazole-5-sodium sulfonate, benzotriazole silver Silver triazole-4-sulfone potassium, silver benzotriazole-5-sulfone potassium, silver benzotriazole-4-ammonium sulfonate, silver benzotriazole-5-ammonium sulfonate, silver 4-carboxybenzotriazole, 5-carboxybenzo triazole silver, benzotriazole silver-4-sodium carboxylate,
Sodium benzotriazole silver-5-carboxylate, potassium benzotriazole silver-4-carboxylate, potassium benzotriazole silver-5-carboxylate, ammonium benzotriazole silver-4-carboxylate, ammonium benzotriazole silver-5-carboxylate, 5-carbamoylbenzotriazole rufamoylbenzotriazole silver, 5-carboxy-
Silver 6- and droxybenzotriazole, Silver 5-hydroxy-7-sulfobenzotriazole, 4-Hydroxy-
5-Sulfobenzotriazole silver, 4-hydroxy-7
-silver sulfobenzotriazole, silver 5,6-dicarboxybenzotriazole, silver 4,6-hydroxybenzotriazole, silver 4- and droxy-5-chlorobenzotriazole, silver 4-hydroxy-5-methylbenzotriazole, 4 -Hydroxy-5-methoxybenzotriazole silver, 4-and droxy-5-nitrobenzotriazole silver, 4-and droxy-5-cyanobenzotriazole silver, 4-hydroxy-5-aminobenzotriazole silver, 4-hydroxy-5 -7 Cetamidobenzotriazole silver, 4-hydroxy-5-benzenesulfonamide benzotriazole silver, 4-hydroxy-5-hydroxycarbonylmethoxybenzotriazole silver, 4-hydroxy-5-ethoxycarbonylmethoxybenzotriazole silver, 4-hydroxy -5-carboxymethylbenzotriazole silver, 4-hydroxy-5-ethoxycarbonylmethylbenzotriazole silver, 4-hydroxy-
5-phenylbenzotriazole silver, 4-hydroxy-
5-(p-nitrophenyl)benzotriazole silver, 4
-Hydroxy-5-(p-sulfophenyl)benzotriazole silver, 4-sulfo-5-chlorobenzotriazole silver, 4-sulfo-5-methylbenzotriazole silver,
4-Sulfo-5-methoxybenzotriazole silver, 4-
Sulfo-5-cyanobenzotriazole silver, 4-sulfo-5-aminobenzotriazole silver, 4-sulfo-5-
7cetamidobenzotriazole silver, 4-sulfo-5-
Benzenesulfonamide benzotriazole silver, 4-sulfo-5-hydroxycarbonylmethoxybenzotriazolerubonylmethoxybenzotriazole silver, 4-hydroxy-5-carboxybenzotriazole silver, 4-sulfo-5-carboxymethylbenzotriazole silver, 4-sulfo- 5-ethoxycarbonylmethylbenzotriazole silver, 4-sulfo-5-phenylbenzotriazole silver, 4-sulfo-5-(p-nitrophenyl)benzotriazole silver, 4-sulfo-5-(p-sulfophenyl)
Benzotriazole silver, 4-sulfo-5-methoxy-6
-chlorbenzotriazole silver, 4-sulfo-5-chloro-6-carboxybenzotriazole silver, 4-carboxy-5-chlorobenzotriazole silver, 4-carboxy-5-methylbenzotriazole silver, 4-carboxy -5-nitropenzotriazole silver, 4-carboxy-5-aminobenzotriazole silver, 4-carboxy-
5-methoxybenzotriazole silver, 4-carboxy-
5-7 Cetamidobenzotriazole silver, 4-carboxy-5-ethoxycarbonylmethoxybenzotriazole silver, 4-carboxy-5-carboxymethylbenzotriazole silver, 4-carboxy-5-phenylbenzotriazole silver, 4-carboxy-5 -(p-nitrophenyl)benzotriazole silver, 4-carboxy-5-methyl-7-sulfobenzotriazole silver, etc. can be mentioned. These compounds may be used alone or in combination of two or more.

The organic silver salt that can be preferably used in combination with the present invention can be prepared by a known method, and the organic silver salt can be isolated and used by dispersing it in a binder by an appropriate means, or it can be prepared by a suitable method. F the silver salt in the binder! 4 may be prepared and used as is without isolation.

The amount of the organic silver salt used is 0 per mole of silver halide.
．． 01 mol to 500 mol is preferable, more preferably 0
．． The amount is 1 mol to 100 mol.

The average particle size of the organic silver salt is about 10μ to about 0.01μ.
I is preferred, and more preferably about 5 μm to about 0.1 μm.

Reducing agents that are oxidized by internal latent image type silver halide and/or organic silver salts used in combination as necessary, and have the ability to form or release a dye by reacting with a dye-donating substance include oxidative coupling agents. Color developing agents that form dye images are useful. Examples of such reducing agents include 4-N. N
-Dialkylphenylsulfamic acids, also N,N
-diethyl-p-phenylenediamine, N-phenyl-
N,N-dialkyl-p-phenylenediamines such as N-isopropyl-p-phenylenediamine, etc.
The so-called p-phenylenediamine color developer described in U.S. Pat. No. 3,531,286. Aminophenols such as 2-methylphenol sulfate, 4-amino-, 2,8-dichlorophenol hydrochloride, and loride are also preferably used.

Furthermore, phenolic reducing agents such as 2,6-dichloro-4-substituted sulfonamidophenol, naphthol reducing agents such as 4-7-mino-naphthol derivatives and 4-substituted sulfonamidonaphthol derivatives, U.S. Pat. No. 2,895 ,8
25, aminopyrazoline derivatives described in U.S. Pat. No. 2,892,714, and Research Disclosure N.
o, 19412 and same No. 19415 (1
The hydrazine derivatives described in J. 980) are useful.

These reducing agents may be used alone or in combination of two or more including the above-mentioned reducing agents.

The reducing agent used in the present invention is used within a certain concentration range.

The concentration am range of the useful reducing agent is preferably from 0.01 mol to 1500 mol, more preferably from 0.1 mol to 200 mol, per mol of internal latent image type silver halide.

In addition to the above-mentioned reducing agents, the following reducing agents can also be used as auxiliary developers.

Useful auxiliary developers include hydroquinone, alkyl-substituted hydroquinones such as -butylhydroquinone and 2,5-dimethylhydroquinone, catechols, pyrogallols, halogen-substituted hydroquinones such as chlorohydroquinone and dichlorohydroquinone, and methoxyhydroquinone. There are polyhydroxybenzene derivatives such as alkoxy-substituted hydroquinones and methylhydroxynaphthalene. Furthermore, methyl gallate, ascorbic acid, ascorbic acid derivatives, hydroxylamines such as N'-di(2-ethoxyethyl)hydroxylamine, 1-phenyl-3-pyrazolidone and 4-methyl-4-
Pyrazolidones such as hydroxymethyl-1-phenyl-3-pyrazolidone, reductones, and hydroxytetronic acids are useful.

The auxiliary developer used in the present invention can be used within a certain concentration range. A useful concentration range is preferably from 0.01 mol to 1500 mol, more preferably from 0.1 mol to 200 mol per mol of silver halide.

Various binders can be used in the photosensitive material of the present invention, and suitable binders include hydrophilic or hydrophobic binders depending on the purpose.

Contains, for example, proteins such as gelatin and gelatin derivatives, cellulose derivatives, polysaccharides such as dextran, natural substances such as gum arabic, and latex-like vinyl compounds that increase the dimensional stability of photographic materials and synthetic polymers such as: do. Suitable synthetic polymers include U.S. Pat. Nos. 3,142,586 and 3,193.
．． No. 386, No. 3,062,674, No. 3,22
No. 0,844, No. 3.287,289, No. 3.4
Examples include those described in each Memorandum of No. 11,911. Useful polymers include water-insoluble polymers based on alkyl acrylates, methacrylates, acrylic acid, sulfoalkyl acrylates or methacrylates. Suitable polymeric materials include polyvinyl butyral, polyacrylamide, cellulose acetate butyrate, cellulose acetate propionate, polymethyl methacrylate, polyvinylpyrrolidone, polystyrene, ethyl cellulose, polyvinyl chloride, chlorinated rubber, polyisobutylene, butadiene styrene copolymer. , vinyl chloride-vinyl acetate copolymer, vinyl acetate-vinyl chloride-maleic acid copolymer, polyvinyl alcohol, polyvinyl acetate, benzylcellulose, cellulose acetate, cellulose propionate, and cellulose acetate phthalate. Among these polymers, especially polyvinyl butyral, polyvinyl acetate, ethyl cellulose,
Polymethyl methacrylate and cellulose acetate butyrate are preferred. If necessary, two or more types may be used in combination.

In the present invention, the binder is preferably a hydrophilic binder. Here, "hydrophilic" means something that is soluble in water or a mixed solution of water and an organic solvent (a solvent that can optionally be mixed with water). Examples of hydrophilic binders include:
Natural substances such as gelatin, gelatin derivatives, cellulose derivatives, polysaccharides such as dextran, gum arabic, etc. and useful polymers such as polyvinyl acetal (preferably with a degree of acetalization of less than 20%, e.g. polyvinyl butyral), polyacrylamide, polyvinyl and lolidon. , ethyl cellulose, polyvinyl alcohol (preferably one with a saponification degree of 15% or more), and the like. These may be used in combination of two or more types, if necessary.

The amount of the binder is preferably 0.01 to 100 times, more preferably 0.05 to 50 times the internal latent image type silver halide in each photosensitive layer, and the amount of the binder is preferably 0.01 to 100 times, more preferably 0.05 to 50 times the amount of the internal latent image type silver halide in each photosensitive layer. The preferred range is 0.2 to 50 g per 2 (total amount of binder in each layer).

The heat-developable photosensitive material of the present invention is imagewise exposed and then thermally developed to form an imagewise distribution of a heat transferable dye from the dye-providing substance, and at least a part of the imagewise distribution is integrated with the photosensitive material. The images are transferred to an overlying image receiving member to form a color image.

For example, methanol,
Various transfer methods can be used, such as transfer using an organic solvent such as acetonitrile or dimethylformamide or water, thermal transfer using a hot solvent, or thermal transfer using sublimation of the dye itself. When a solvent is contained, the dye can be transferred simply by heating the image receiving member in close contact with the image receiving member.

The image receiving member used in the present invention only needs to have a deep ability to receive the dye released or formed by thermal development, and may be used as a mordant used in dye diffusion transfer type light-sensitive materials or as disclosed in JP-A-57-2
It is preferable to use a heat-resistant organic polymer material having a glass transition temperature of 40° C. or higher and 250° C. or lower as described in Japanese Patent No. 07250 or the like.

Specific examples of the mordants include nitrogen-containing secondary and tertiary amines, nitrogen-containing heterocyclic compounds, quaternary cationic compounds thereof, U.S. Pat. Nos. 2,548,564 and 2,48
No. 4,430, No. 3,148,061, No. 3,756
, 814; vinylpyridine and vinylpyridinium cationic polymers disclosed in U.S. Patent No. 2,675,316; polymers containing dialkylamino groups disclosed in U.S. Pat. Aminoguanidine derivatives, JP-A-1987
Covalently reactive polymers described in U.S. Pat. No. 3,625,694, U.S. Pat.
096, British Patent No. 1,277.453, British Patent No. 2,
No. 011,012, a mordant capable of crosslinking with gelatin, etc., and an aqueous mordant as disclosed in U.S. Pat. No. 3,958,995, U.S. Pat. Sol-type mordant, JP-A-50-8122
8, the water-insoluble mordant disclosed in U.S. Pat.
No. 788,855, West German Patent Application (018) No. 2,84
No. 3,320, JP-A No. 53-30328, JP-A No. 52-1
No. 55528, No. 53-125, No. 53-1024
No. 54-74430, No. 54-124726,
No. 55-22766, U.S. Patent No. 3,642,482
No. 3,488.706, No. 3,557,06
No. 6, No. 3,271,147, No. 3,271,1
No. 48, Special Publication No. 55-29418, No. 56-36
No. 414, No. 57-12139, RD 120
45 (1974).

Particularly useful mordants are polymers containing ammonium salts,
Polymers containing quaternary amino groups as described in US Pat. No. 3,709,690. For example, the polymer containing ammonium salt is polyacrylate-N,N,Nt-lylowhexyl-N-vinylbenzylammonium chloride, and the ratio of styrene and vinylbenzylammonium chloride is 1:4 to 4:1. is preferable, and more preferably 1:1.

A typical image-receiving layer for dye diffusion transfer is obtained by coating a polymer containing an ammonium salt mixed with gelatin on a support.

As an example of the heat-resistant organic polymer substance, a molecular weight of 200
0 to asoo polystyrene, polystyrene derivatives with substituents having 4 or less carbon atoms, polyacetals such as polyvinylcyclohexane, polydivinylbenzene, polyvinylpyrrolidone, polyvinylcarbazolebenzene, polyvinyl alcohol, polyvinyl formal and polyvinyl butyral, polyvinyl chloride, Chlorinated polyethyl, polychlorobutylene, polyacrylonitrile, polyN. N-dimethylallylamide, polyacrylate with p-cyanophenyl group, pentachlorophenyl group and 2,4-dichlorophenyl group, polyacrylchloroacrylate, polymethyl methacrylate, polyethyl methacrylate, polypropyl methacrylate, polyisopropyl methacrylate, polyisobutyl Polyesters such as methacrylate, poly tert-butyl methacrylate, polycyclohexyl methacrylate, polyethylene glycol dimethacrylate, poly-2-cyano-ethyl methacrylate, polyethylene terephthalate, polycarbonates such as polysulfone, bisphenol A1 polycarbonate, polyanhydride, polyamides and cellulose acetates.

Also, Polymer Handbook 2nd
ed. (J.

Brandrup, E. H. Immerg
ut 41) John Wiley & Sons
Also useful are synthetic polymers with a glass transition temperature of 40''G or higher, as described in the publication.

These polymeric substances may be used alone or in combination of two or more as a copolymer.

Particularly useful polymers include cellulose acetate such as triacetate, diacetate, terephthalic acid with heptamethylene diamine, adipic acid with fluorene diamine, hexamethylene diamine diphenic acid, hexamethylene diamine with isophthalic acid, etc. Polyamide, polyester made from a combination of diethylene glycol and diphenylcarbonate, bis-p-carboxyphenoxybutane and engineered ethylene glycol, polyethylene terephthalate, polycarbonate,
Examples include vinyl chloride. These polymers may be modified. For example, polyethylene terephthalate using cyclohexane dimetatool, isophthalic acid, methoxypolyethylene glycol, 1,2-dicarpomethoxy4-benzenesulfonic acid, etc. as a modifier is also effective. Among these, particularly preferred are:
Examples include a layer made of polyvinyl chloride as described in Japanese Patent Application No. 58-97907, and a layer made of polycarbonate and a plasticizer as described in Japanese Patent Application No. 58-128800.

The above polymer is used by dissolving it in a suitable solvent and coating it on a support to form an image receiving layer, or by laminating a film-like image receiving layer made of the above polymer on a support, or by coating it on a support. It is also possible to constitute the image-receiving layer solely from a member (for example, a film) made of the above-mentioned polymer (combined image-receiving layer/support type).

Roughly, the image-receiving layer is made opaque by containing titanium dioxide, etc. dispersed in gelatin on the image-receiving layer on a transparent support! (Reflective layer) may also be provided. This opaque layer provides a reflective color image when the transferred color image is viewed from the transparent support side of the image-receiving layer.

The internal latent image type silver halide emulsion in the present invention is disclosed in, for example, US Pat. No. 1,623,499, US Pat.
For example, chemical sensitizers such as sulfur, selenium, tellurium compounds, gold, platinum compounds, reducing agents such as tin halides, or these It may also be chemically sensitized by using a combination of.

Further, the internal latent image type silver halide emulsion in the present invention includes, for example, a cyanine dye, a merocyanine dye, a complex cyanine dye, a complex merocyanine dye, a holoporacyanine dye,
styryl dye, hemicyanine dye, oxonol dye,
Optical sensitizing dyes such as hemioxonol dyes alone or in combination
Optical sensitization may be achieved by using more than one species in combination. Furthermore,
Ascorbic acid derivatives, azaindene, cadmium salts,
Additives having a supercolor-sensitizing effect that does not absorb visible light, such as organic onium salts and organic sulfonic acids, such as those described in U.S. Patent Nos. 2,933,390 and 2,937,089, etc. Can also be used together.

Research Disclosure N for sensitizing dyes
15162 (November 1976).

Various methods can be used in combination to prevent thermal fog in the photothermographic material used in the practice of the present invention.

One method is to use benzotriazole and its derivatives, thiouracils, mercapto compounds such as 1-phenyl-5-mercaptotetrazole, azole thioethers, or blocked azolethiones,
Disulfides such as persulfates, such as N-halogenosuccinimide, N-halogenoacetamide, N-halogenoxacillinone, N-halogenobenzotriazole,
N-halogeno compounds such as N-halogenobenzimidazole can also be used. Other methods for preventing heat fog include, for example, higher fatty acids such as lauric acid, myristic acid, and behenic acid, tetrahalogenophthalic acid or its anhydride, arylsulfonic acids such as benzenesulfonic acid and p-toluenesulfonic acid, Salts such as 7-arylsulfinic acid such as p-toluenesulfinic acid, or salts thereof, and lithium salts of higher fatty acids such as lithium laurate, lithium myristate, and lithium behenshun can be used as stabilizers. Other acids include salicylic acid, ρ-hydroxybenzoic acid, tetrachlorobenzoic acid, p-acetamidobenzoic acid, W1-benzoic acid, phthalic acid, isophthalic acid, trimetic acid, biromet, 5.5-monethylenepisalcylic acid, etc. Stabilizers are also effective.

Examples of color toning agents that can be used in the heat-developable material used in the present invention include JP-A-46-4928 and JP-A-46-601.
No. 7, No. 49-5019, No. 49-5020, No. 4
No. 9-91215, No. 49-107727, No. 50-
No. 2524, 5O-67132J! , 50-676
414, No. 50-114217, No. 52-3372
No. 2, No. 52-99813, No. 53-1020,
No. 53-55115, No. 53-76020, No. 53
-125014, 54-156523, 54-
No. 156524, No. 54-156525, No. 54-1
No. 56526, No. 55-4060, No. 55-4061
No. 55-32015, West German Patent No. 2,140,406, West German Patent No. 2,147,063, West German Patent No. 2,220.618@, and U.S. Patent No. 3,080,25
No. 4, No. 3,847.612, No. 3,782,9
No. 41, No. 3,994,732, No. 4,123,
Phthalazinone, phthalimide, pyrazolone, quinazolinone, N-hydroxynaphthalimide, benzoxazine, naphthoxazinedione, which are compounds described in the specifications of No. 282, No. 4,201,582, etc.
2.3-dihydro-phthalazinedione, 2.3-dihydro-1,3-oxazine-2,4-dione, oxypyridine, aminopyridine, hydroxyquinoline, aminoquinoline, isocarbostyryl, sulfonamide, 2l-
(-1,3-benzothiazine-2,4-(3H) dione, benzotriazine, mercaptotriazole, dimercaptotetrazabentalene, phthalic acid, naphthalic acid, phthalamic acid, etc., and one or more of these and A mixture with an imidazole compound or a mixture of at least one acid anhydride such as phthalic acid or naphthalic acid and a phthalazine compound, further a mixture of phthalazine and maleic acid,
Examples include combinations of itaconic acid, quinolinic acid, gentisic acid, and the like. Also, Japanese Patent Application Laid-open No. 5
3-amino-5-mercapto-1°2.4 described in No. 8-189628 and No. 58-193541
-triazoles and 3-acylamino-5-mercapto-1,2,4-triazoles are also effective.

The internal latent image type photosensitive silver halide emulsion used in the present invention is used in order to suppress the surface sensitivity as low as possible, provide lower minimum density, and more stable characteristics, such as thiazolium salts, azaindenes (typical As such, each 4-
Mention may be made of hydroxy-6-methyl-1,3,3a, 7-tetrazaindene and 1-phenyl-5-mercaptotetrazole. ), urazole, sulfocatechol oxime, nitrone, nitroindazole, etc. It is preferable to add antifogging and stabilizing agents. Regarding these, for example, U.S. Pat.
No. 2,597,915, British Patent No. 623,4
It is described in each specification of No. 48.

Internal latent image type silver halide holes used in the present invention.

Examples of the agent include wetting agents such as human O-oxyalkanes, copolymers of alkyl acrylates or alkyl methacrylates with acrylic acid or methacrylic acid, and emulsion polymerization of styrene-maleic anhydride semi-alkyl ester copolymers. Film property improvers such as water-dispersible particulate polymeric substances, coating aids such as saponin, polyethylene glycol lauryl ether, etc., thickeners, antistatic agents, gelatin plasticizers, surfactants, l)
H regulator, antioxidant, ultraviolet absorber, dye, brightener,
It is optional to add various photographic additives such as mordants and matting agents such as starch, titanium dioxide, zinc oxide, silica, alumina, kaolin, clay, polymer beads such as polymethyl methacrylate, etc. .

The photographic constituent layers of the heat-developable photosensitive material used in the practice of the present invention can be hardened using various organic or inorganic hardeners. Suitable hardeners include, for example, chromium salts, zirconium salts, aldehydes such as formaldehyde and mucohalogen acids, halotriazine hardeners, polyepoxy compounds, ethyleneimine hardeners, vinyl sulfone hardeners, isocyanate hardeners, carbodiimide hardeners, and acryloyl hardeners. Examples include film agents.

The photographic constituent layer containing each component used in the heat-developable photosensitive material used in the present invention is coated on various supports selected from a wide variety of materials.

Generally, this support may be of any shape, but since it is preferable to use a support that is visible in handling as an information recording material, a film or sheet is usually used. Materials for the support include cellulose nitrate, cellulose ester (partially acetylated versions of these are also good), polyvinyl acetal, polyethylene, polyethylene terephthalate, polycarbonate, polyimide, and other plastic films or sheets, glass, Examples include paper, films and sheets of metals such as aluminum. Furthermore, baryta paper, resin coated paper, and water-resistant paper can also be used. As a paper support,
Clay-treated paper such as art paper or coated paper is most suitable, and paper sized with polysaccharide or the like may also be used.

In addition to coating these supports with the various layers described above, the supports themselves can also contain some of the components. Of course, when components are mixed into a support such as plastic, glass, or metal, there are many difficulties in fully demonstrating their functions, but for example, in the case of a paper-based support, Even if a certain component is mixed into the support (paper base material), it will exhibit the same effect as if it were formed into a layer coated on the support. The components may be incorporated into the support, or
Alternatively, whether it is contained in the coated layer on the support can be easily carried out depending on various conditions such as the intention of the practitioner of the present invention and necessity and advantage in production.

The heat-developable photosensitive material used in the practice of the present invention may further contain various additives in order to increase the density of the resulting image. For example, as described in U.S. Pat.
Tetrahydrothiophene-1,1-dioxide, 4-hydroxybutanoic acid lactone, methylsulfinylmethane, sulfamide derivative Noyo-CO-1-SO-,
Compounds having a group such as Al-iha-8o are effective.

The above compounds can be used in a wide range of applications.

The useful range is preferably 20% or less of the dry coated film thickness of the photosensitive material converted into weight, more preferably 0.
1 to 15 weight percent.

Other useful salts include zinc, cadmium, and copper acetates, such as those described in U.S. Pat. No. 3,708,304. In particular, there are base-releasing compounds that become alkaline when heated, such as acid salts of amines, metal oxides, or hydroxides, and water-releasing compounds that decompose and release water when heated, such as NH+Fe (SO4)212820. It is effective as a substance that promotes development and dye release reactions. These accelerators can be used in a wide range of ways. The useful range is preferably 50% by weight or less of the dry coated film thickness of the photosensitive material, more preferably 0.01% to 40% by weight.

In addition, Red Seal Patent No. 3,347,675, Japanese Unexamined Patent Publication No. 1983-
Polyglycols, ureas, pyridines, amides, sulfonamides, imides, alcohols, oximes, etc. described in Nos. 57231 and 59-168439 are solid at room temperature, but are used. A non-hydrolyzable thermal solvent that exhibits a mixed melting point together with other components at the processing temperature is preferably used.

For the photographic constituent layers of the heat-developable photosensitive material used in the present invention, coating solutions are prepared and sequentially applied onto a support by various coating methods such as dipping, air knife, curtain coating, or hopper coating. A photosensitive material can be created by 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@.

[Specific Effects of the Invention] As explained above, in the present invention, a silver halide photosensitive material having an emulsion layer containing at least a dye-providing substance and an internal latent image type silver halide on a support is prepared after image exposure. , heating process, full-surface exposure process, developing process,
It consists of a step of transferring the dye imagewise generated or released in the emulsion layer by the action of heating to an image-receiving element, so that a clear positive dye image can be obtained by a simple method in a substantially water-free state. I was able to provide a method.

[Specific Examples of the Invention] The present invention will be described below with reference to Examples, but the embodiments of the present invention are not limited thereto.

Example-1 [Preparation of internal latent image type silver halide emulsion] JP-A-55-1
An internal latent image type silver halide emulsion was prepared according to the method described in No. 27549. i.e. 10g of gelatin
220 m of a 1.2 molar aqueous solution of potassium chloride containing
l of a 1 molar aqueous solution of silver nitrate at 40 °C.
was added immediately. After physical ripening for 10 minutes, 200 λ of a 1.2 molar aqueous solution of potassium bromide was added to obtain conversion type silver chlorobromide particles.

Adjusting l)H of the endothermic silver chlorobromide emulsion thus produced,
Excess salt was removed by settling and washing with water.

Thereafter, 1) H was adjusted to 6.0 to obtain a silver chlorobromide emulsion with a yield of 400 g.

[Preparation of sulfobenzotriazole silver emulsion] Water 150
40 g of poly(4-vinylpyrrolidone), 30 g of 4-sulfobenzotriazole, and 6 g of sodium hydroxide were dissolved and stirred in a mixed solvent of 150 d of 5N silver nitrate and 150 d of ethanol. ) Adjust H to 6-8 and add water, total amount 6001
An organic silver salt dispersion was obtained as 1J&.

[Preparation of gelatin dispersion of dye-providing substance] 3017 of the following dye-providing substance C-1 was mixed with dioctyl phthalate 26i;
1,1 containing a 5% aqueous solution of Alkanol XC (manufactured by DuPont) dissolved in 96 g of ethyl acetate.
% gelatin aqueous solution 350 aJ2. and dispersed with an ultrasonic homogenizer to prepare an oil-in-water dispersion of the dye-providing substance.

" CHC, 4H.

OOH [Preparation of heat-developable photosensitive material A-1] The following composition containing the internal latent image silver halide emulsion prepared above, sulfobenzotriazole silver as an organic silver salt, and a gelatin dispersion of a dye-providing substance was prepared as follows. Prepared.

The following margin [Photosensitive coating liquid composition A-1 (a) Internal latent image type silver chlorobromide emulsion 50 g (b
) Gelatin dispersion of dye-donating substance C-1 40m,! (C)4
-Sulfobenzotriazole silver salt dispersion 40 mi(d)4
-(diethylamino)-2-methylphenylsulfamine Shun soda 0.5g (e) Gelatin
2g(r) 3-methyl-1,3,5-pentanetriol θ g(Q) Development accelerator 3% aqueous solution 5■1(h) Surfactant 5
% aqueous solution 21yo (1) Hardener 3% aqueous solution s aJ (j) water
To s1 or more <a>~(J) are mixed, 3
After maintaining the temperature at 5℃±1℃ and adjusting the pH to 5.5, the thickness is 150μ.
- A silver layer was coated on a polyethylene terephthalate film which had been subjected to a subbing process to a thickness of 1.1Q/■.

[Preparation of heat-developable color photosensitive material A-2] Instead of the dispersion of dye-providing substance C-1 used in the heat-developable photosensitive material A-1, 4 g of the dye-providing substance Y-1 below was mixed with ethyl acetate. 12 rail, this solution was mixed with 30 lJ of 2.5% gelatin aqueous solution containing a surfactant, water was added to make it so mal, and then dispersed with an ultrasonic homogenizer to obtain a dispersion of the dye-providing polymer. The following composition was prepared as follows.

Dye-providing substance Y-1 (a') Internal latent image type silver chlorobromide emulsion sample (same as A-1) 50 g (b') Gelatin dispersion of dye-providing substance Y-1 40 companies (c') 4 -Sulbenzotriazole silver salt IRNI
4awLfl.

(d') Sodium 4-(diethylamino)-2-methylphenylsulfamate 0.5g (e') Gelatin
2g (f') polyvinylpyrrolidone (average molecular weight 30,000) 3a (g'
) Polyethylene glycol (molecular weight 300) 3Q(h')
3-Methyl-1,3,5-pentanetriol 3g (1') Water 10■λ or more (a'
) to (1') were mixed and coated onto a polyethylene terephthalate film having a thickness of 150 μl using the same method as sample-1 so that the amount of silver was 0.95 Mm'.

The heat-developable photosensitive materials A-1 and A-2 obtained above were imagewise exposed to tungsten light through a sensitometry light beam, then heated on a heat block heated to 150°C, and 10 seconds elapsed after the start of heating. Then, the entire surface was exposed for 10 seconds at an exposure intensity of 100 lux using tungsten light as a light source, and then the temperature was returned to N.

Next, polyvinyl chloride-containing latex NIPOL G-576 (manufactured by Nippon Zeon Co., Ltd.) was coated on photographic baryta paper and passed through an atmosphere of 150°C to form a smooth film. , overlap the above-mentioned full-surface exposure passion development photosensitive materials so that the film surfaces are in contact with each other,
Using a commercially available heat development device Copymate model ■ (manufactured by Graphic Product Inc.), 150℃1
When the image-receiving material is immediately peeled off after thermal development for a minute, a positive cyan transferred color image is left on the image-receiving material from the photothermographic material A-1, and a positive yellow transferred color image is left on the image-receiving material from A-2. was gotten. The reflection density of this positive image is measured by the densitometer,
Table 1 shows the results of measuring the maximum density (D*aX) and minimum density (DIIn) using Sakura Densitometer PDA-85 (manufactured by Konishiroku Photo Industry Co., Ltd.).

As is clear from the results in Table 1, it can be seen that good dye images can be obtained with the samples of the present invention.

Example-2 The following reducing dye-providing substance M-1 was used instead of the dye-providing substance C-1 used in the heat-developable photosensitive material A-1 of Example-1.
was dissolved in dioctyl phthalate 300 and ethyl acetate 9G-no, mixed with an aqueous gelatin solution containing a surfactant, and then dispersed with an ultrasonic homogenizer to prepare an oil-in-water dispersion 5001λ of a dye-providing substance. The following composition containing this dispersion was prepared as follows.

Dye-providing substance M-1 [Photosensitive coating composition A-31 (a″) Internal latent image type silver chlorobromide emulsion (same as sample A-1) 60 g (b) Dispersion of dye-providing substance M-1 so ml(c
”) Trimethylolethane 10g (d”
) 10% ethanol solution of guanidine tric OO acetic acid 10Ili(a″)
10% polyvinylpyrrolidone aqueous solution 30 ml (f'') Hardener 3% aqueous solution 5a (g'') Gelatin 2 g (h) Water
20■1 or more of <aII>~(h'') were mixed, heated and dissolved, and then coated on a subbed polyethylene terephthalate film so that the silver amount was 1.3 g/l. A heat-developable color photosensitive material A-3 was produced.

This photosensitive material A-3 was imagewise exposed to tungsten light through a sensitometric light wedge, then heated on a heat block heated to 150°C, and 15 seconds after the start of heating, a light source of 250 lux was applied using tungsten light as a light source. The entire surface was exposed to light for 10 seconds at the exposure intensity, followed by uniform heating to 150° C. on a light-reading heat block for 40 seconds. Next, a 1:1 mixture of styrene and N-benzyl-N,N-dimethyl-N-(3-maleimidopropyl) ammonium chloride was placed on a 100-μ thick polyethylene terephthalate film that had been subbed and kneaded with white pigment. The image-receiving material coated with an image-receiving layer made of a copolymer of
They were stacked so that the membrane surfaces were in contact. After 30 seconds, the image-receiving material was peeled off from the photosensitive material, and a positive magenta transferred image was obtained on the image-receiving material.

The density of this positive image was determined by measuring the reflection density using the densitometer, and found that the maximum density was 1.56 and the minimum density was 0.62.
Met.

[Preparation of heat-developable photosensitive material A-4] Adding 0.4 g of 1-phenyl-4-methyl-4-hydroxymethyl-3-pyrazolidinone as a reducing agent to the photosensitive coating solution A-3 of the heat-developable photosensitive material A-3 A heat-developable color photosensitive material A-4 was prepared in exactly the same manner as Sample A-3 except that 2 g of polyethylene glycol was added.

This photosensitive material A-4 was subjected to the same operations and treatments as sample A-3. The reflection density of the magenta transferred color image obtained as a result was a maximum density of 1.71 and a minimum density of 0.47.

Example 3 A laminated multicolor photothermographic material was prepared by sequentially coating the layers described below on a transparent undercoated polyethylene terephthalate support having a thickness of 150 μm.

(1) Red-sensitive internal latent image type silver chlorobromide emulsion layer Emulsion in which internal latent image type silver chlorobromide grains prepared in Example-1 were formed into a red layer (silver coating amount 2.OQ/I''), 4 - Sulfobenzotriazole silver (silver coverage o, sg, /ll!2), the cyan image-providing substance C-1 (0,7a/II''), 3-methyl-1,3,5-pentanetriol (1 ,2g/
I), 4-(diethylamino)-2methylsulfamine-coated soda (0,5σ/11”), gelatin (1,2Q
/l) and polyvinylpyrrolidone (1, 2, /l)
(2) Intermediate layer Layer consisting of gelatin (Q, 4 g/l) and polyvinylpyrrolidone (0,40/l) (3) Green-sensitive internal latent image type silver chlorobromide emulsion layer Image-type silver chlorobromide emulsion (1,7Q/12), 4-sulfobenzotriazole silver (silver coating fit 0.5a/a
), the magenta dye-providing substance M-1 (0.7 g/
irises), 3-methyl 1,3,5-pentanetriol (1
,2o/-), 4-(diethylaminone-2methylphenylsruder (0.50/s"), gelatin (1.212
/meal 2) and polyvinylpyrrolidone (1.29
/12) (4) Intermediate layer consisting of gelatin (0.4 g/m") and polyvinylpyrrolidone <0.411/l") (5) Blue-sensitive internal latent image type silver chlorobromide emulsion layer A sensitized internal latent image type silver chlorobromide emulsion (2.Oσ/m"), 4-sulfobenzotriazole silver (silver coating weight 0.5σ/12-), and the yellow dye-providing substance Y-1 (0.0σ/m"). 8!J/I), 3-methyl 1
, 3.5-pentanetriol (1.2o/m), 4-
Sodium (diethylamino)-2-methylphenylsulfamate (0.6g/■2), gelatin (1.2a
/m”) and polyvinylpyrrolidone (1.20
(6) Intermediate layer consisting of a compound having the following structure (0.80/l") and a layer consisting of gelatin (0.4a/m) and polyvinylpyrrolidone (0.4(F/I)). 7) Protective layer A layer consisting of gelatin (0,3111/l) # and glyoxal (0,03 g,/'l'') The heat-developable photosensitive material obtained above was passed through a sensitometric light and exposed to a tungsten light. After imagewise exposure, the film was heated for 10 seconds on a heat block heated to 150° C., and the entire surface was exposed to light for 10 seconds at an exposure intensity of 100 lux using tungsten light as a light source, and then returned to room temperature.

Next, the thermal transfer image-receiving material used in Example-1 and the above-mentioned exposed photothermographic material were stacked so that their film surfaces were in contact with each other, and heat development was performed at 150° C. for 1 minute in a heat developing device. rear,
When the image-receiving material was immediately peeled off, a color image was obtained which was diffusely transferred onto the image-receiving material.

The maximum density (Dmax) and minimum density ([)win) of the obtained positive image were measured using the densitometer, and the results are shown in Table 2.

As is clear from the results in Table 2, it can be seen that good dye positive images can be obtained even in the heat-developable color photosensitive material of the present invention having a multilayer structure.

Claims (1)

[Claims] After imagewise exposure of a silver halide photosensitive material having, on a support, a silver halide emulsion layer containing at least a dye image-providing substance and an internal latent image type silver halide whose surface is not previously coupled, a step of heating the entire surface; A method for forming a positive image, comprising the steps of exposing to light, developing, and transferring the dye imagewise generated or released in the silver halide emulsion layer to an image-receiving element by the action of heating.