JPH02123354A - Heat-developed color photosensitive material and processing of heat-developed color photosensitive material - Google Patents

Abstract

PURPOSE:To obtain a heat-developed color photosensitive material providing a picture image having a high maximum density and a low minimum density by incorporating a specified compd. into a heat-developed color photosensitive material. CONSTITUTION:In a heat-developed color photosensitive material having at least one photography constituting layer contg. photosensitive silver halide, dye-donating material, and a binder on a base body, at least one kind of compd. expressed by formula I is incorporated into the heat-developed color photosensi tive material. In formula I, X is a group having -0.9-(-1.9)pi value (a parameter indicating hydrophobic property); R1 is alkyl group, alkoxy group, or halogen atom; J is a divalent group; R2 is alkyl group, alkoxy group, or amino group; (l) is zero or 1; (m) is zero or 1 which is zero when X is -SO2NH group. Thus, a picture image having high maximum density and low minimum density is obtd. by the processing for a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat-developable color photosensitive material in which a dye image is formed by heat development. The present invention can be suitably embodied, for example, as a heat-developable color photosensitive material that forms a color image by diffusion-transferring a dye.

The present invention also relates to a method for thermally developing color photosensitive materials. The developing method of the present invention can be suitably used, for example, in thermal development in which a color image is formed by diffusion transfer of a dye.

[Background of the invention]

A photosensitive material (thermally developable photosensitive material) that can easily and quickly form an image by carrying out a dry process using heat in the development process is well known. Publication No. 43-4924, pages 553-555 of "Fundamentals of Photographic Engineering" Silver Salt Photography m (Published by Corona Publishing, I879), and Research Disclosure Magazine June 1978 issue, pages 9-15 (RD-170)
29) etc.

There are two types of heat-developable photosensitive materials: those that produce black-and-white images and those that produce color images.In recent years, in particular, attempts have been made to develop heat-developable color photosensitive materials that produce color images using various dye-providing substances. .

There are various methods for heat-developable color photosensitive materials, such as a method in which a color image is obtained by releasing or forming a diffusible dye through heat development and then transferring the dye (
Although this method (hereinafter referred to as a transfer method) requires an image receiving member for transfer, it is superior in terms of image stability and clarity, and processing simplicity and speed. This transfer method heat-developable color photosensitive material and image forming method are described, for example, in JP-A-50-12431, JP-A-59-159159, and JP-A-5.
No. 9-181345, No. 59-229556, No. 60
-2950, 61-52643, 61-611
No. 58, No. 61-61157, No. 59-180550
No. 61-132952, U.S. Pat. No. 61-132952, and U.S. Pat.
, No. 590.154 and No. 4,584,267.

In heat-developable light-sensitive materials, a heat solvent is often added to the light-sensitive material for the purpose of activating heat development, and in particular, in diffusion transfer type heat-developable color photosensitive +A materials, it increases the efficiency of diffusive dye formation. Various thermal solvents or solvents are added to the photosensitive layer and/or non-photosensitive layer of a heat-developable photosensitive material for the purpose of improving dye transfer efficiency.

Conventionally known thermal solvents are broadly divided into those that are in a liquid state at around room temperature and those that are in a solid state at around room temperature but liquefy during heat development and exhibit various functions as a thermal solvent. Typical examples of the former can be found in alcohols, polyols, phenols, relatively low molecular weight ureas, amides, etc.; Many of the thermal solvents themselves are hygroscopic or exist in liquid form in the photosensitive material, so they may cause the photosensitive material to become sticky or cause damage to the back side of the photosensitive material or between it and other substances. Many of them tend to stick together, making them difficult to put to practical use.

On the other hand, hot solvents that are solid at room temperature can significantly reduce the above drawbacks. Examples of this type of thermal solvent that is solid at room temperature include compounds described in JP-A-62-136645, JP-A-60-232547, and JP-A-61-198528.

Incidentally, heat-developable photosensitive materials have the advantage of rapid development processing, but it is desired to obtain images with high maximum density and low minimum density by further rapid processing.

In order to shorten the development time of heat-developable photosensitive materials in this way,
It is necessary to activate heat development and, in the case of transfer-based photosensitive materials, to accelerate the transfer of dyes and the like. Thermal solvents are largely involved in these improvements.

On the other hand, the thermal solvent is required to have other satisfactory properties, such as that the thermal solvent does not volatilize during thermal development and that it does not adversely affect the hardening film of the binder.

However, it is not always easy to satisfy both such physical performance and the above-mentioned request for shortening the development process.
At present, a thermal solvent that satisfies both of these conditions has not yet been found.

As mentioned above, a heat-developable photosensitive material and a heat-developing method that satisfy the performance requirements as a thermal solvent and can speed up processing and shorten the heat development time have not yet been developed, and therefore, there is a need for such materials. Development is rare.

[Purpose of the invention]

The object of the present invention is to form a dye image by heating,
The object of the present invention is to provide a heat-developable color photosensitive material and a heat-developing method that promote image formation and provide images with high maximum density and low minimum density in a short development process.

[Structure of the invention]

In order to achieve the above object, the present inventors have conducted extensive research and found that
It has been found that the above object can be achieved by the present invention as described below.

That is, the above object is a heat-developable color photosensitive material having at least one photographic constituent layer containing at least a photosensitive silver halide, a dye-providing substance, and a binder on a support, which is represented by the following general formula (I). This can be achieved by a heat-developable color photosensitive material containing at least one compound.

Further, the above object is to provide a heat-developable color photosensitive material having a small number of photographic constituent layers (one layer in total) containing at least a photosensitive silver halide, a dye-providing substance, and a binder on a support.
This is achieved by a heat development method characterized by carrying out heat development in the presence of a compound represented by the following general formula (I).

[In the formula, X represents a group having a π value of -0,9 to -1,9. Further, R1 represents an alkyl group, an alkoxy group (each group includes those having a substituent), or a halogen atom. Moreover, J represents a divalent group. R2 is an alkyl group, an alkoxy group, an amino group (each group includes those having a substituent)
represents. r represents O or l. Further, m represents 0 or 1, but when X is -5O2NH, m represents O.

The compound represented by the above general formula (I) can function as a thermal solvent.

The present invention was made as a result of research into heat-developable photosensitive materials by the present inventors, particularly research into heat solvents. , high maximum density with short processing time,
Moreover, it has been made possible to provide an image with a low minimum density.

Further, the present invention can be applied to a transfer method, in which the dye image formed by heating is transferred to an image receiving member, in which the transfer of the dye is promoted and the maximum density is high with a short development process. , and it is possible to provide an image with a low minimum density.

Further, according to the present invention, it is possible to improve the storage stability of a raw sample (a sample before exposure) of a heat-developable photosensitive material, and also to improve the hardness of the binder, and further to improve the brittleness. can be achieved.

Further, according to the present invention, it is possible to provide a heat-developable photosensitive material containing a heat solvent that does not volatilize during heat development.

Further, according to the present invention, it is possible to provide a thermal development method in which thermal development can be performed in the presence of a thermal solvent that does not volatilize during thermal development.

The thermal development method of the present invention involves the use of a compound represented by the general formula (I) (this compound functions as a thermal solvent as described above, so hereinafter it may also be referred to as "the thermal solvent of the present invention"). Thermal development is carried out in the presence of a polymer, and there are the following aspects. That is, the heat development method of the present invention is as follows: (a); A method of heat developing a heat-developable photosensitive material containing the heat solvent of the present invention; (b); A method (c) in which a flat plate having a layer containing a thermal solvent and a heat-developable photosensitive material are superimposed and thermally developed; (b) a method in which the flat plate is an image receiving member for a dye image (d); There is a method in which the heat solvent of the present invention is applied to the heat-developable photosensitive material and/or another flat plate before heat development, and then the heat-developable photosensitive material and the other flat plate are stacked and thermally developed. A preferred embodiment of the present invention is (a).

(B) and (C), and particularly preferred are (A) and (C).

Next, the compound represented by general formula (I) according to the present invention will be explained in more detail.

X in general formula (I) represents a group with a π value of -0,9 to -1,9 (the π value is a parameter indicating hydrophobicity, "Activity Correlation" (Nankodo) using values of P96-103).

Preferred examples of X include N11COC1h, -CH
zOH.

-NH30□CH: l, C0NHCH: l,
NHCONH2, CONH2゜-NIIC5NII□,
5OzCH3,Cf(zcONHz, So
□N■2-OCON11□, -〇C1I□C0NI
+□, -N(SO□C1h)z, etc. are mentioned. X
A particularly preferred example is N11COCIIi.

C0NtlCIIi, C0NHz, 0CII□CO
Examples include NH2.

Preferred examples of R1 include alkyl groups having 1 to 5 carbon atoms, such as methyl group, ethyl group, n-propyl group, i-
Propyl group, n-butyl group, 1-butyl group: Alkoxy group having 1 to 5 carbon atoms, such as methoxy group, ethoxy group, n-butoxy group; Halogen atom, such as fluorine atom, chlorine atom, bromine atom, iodine atom; etc.

Examples of substituents for R include halogen atoms, such as fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms; hydroxy groups, and alkoxy groups, such as methoxy groups and ethoxy groups;

J represents a divalent group, and particularly preferred divalent groups include 0, 0(C1lz) r, and the like. −(n3=1
~3).

Ntx-, -〇(C+lz), l+0-(n, ~2~3
), -0CO(Cfiz)nz (n3=1~3),
COO(C1lz)7*O (n3=1-3) is mentioned.

R2 represents an alkyl group, an alkoxy group, an amino group (each group includes those having a substituent), and examples of the alkyl group include an alkyl group having 1 to 5 carbon atoms, such as a methyl group, an ethyl group, and a n-propyl group. Examples of alkoxy groups include alkoxy groups having 1 to 5 carbon atoms, such as methoxy groups, ethoxy groups, n-propyloxy groups, etc. can give.

Examples of the amino group include amino groups having 1 to 5 carbon atoms, such as methylamino group and ethylamino group.

Examples of substituents for R2 include halogen atoms, such as fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms; hydroxy groups, alkoxy groups, such as methoxy groups, ethoxy groups, n-propyloxy groups, n-butoxy groups, 2- Bromoethoxy group; Acyl group, such as acetyl group, propionyl group, butyryl group, 2-chloropropionyl group; Acylamino group, such as acetylamino group, propionylamino group; Carbamoyl group, such as N-methylcarbamoyl.

The thermal solvent of the present invention used in carrying out the present invention is:
Those having a molecular weight of 180 to 400 are preferable, and those having a molecular weight of 220 to 320 are more preferable. Further, the solubility in water at 20° C. is preferably 1 g or less, particularly preferably 0.5 g or less.

Further, the thermal solvent of the present invention is preferably a white solid and colorless and transparent when melted.

Further, the melting point of the thermal solvent of the present invention is preferably 70°C or higher and 200°C or lower, more preferably 100°C to 180°C.
℃.

By specifying each group and substitution position in the table below,
Specific examples of the compound represented by the general formula (I) will be illustrated, but the compounds that can be used in the present invention are not limited to the following examples.

TS-I TS-2 TS-3 TS-4 TS-5 TS-6 TS-7 TS-8 TS-9 S13 TS-16 -NIICOC113 NHCOCH.

NlIC0CII.

NH30tCH3 CONHC113 CONI (CH) CONHClh N 11 CON +I□ C0N11゜ 0NHi 0N112 0NL CON11□ CO injection f2 0NIIz -NHC5NII□ Ball stop Q zu” h2” mountain 12 4th place 4th place 4th place 3rd place 3rd place 4th place 4 (standing) 4th place 4th place 4th place 4th place 3rd place 4th place 4th place 4th place 4th place 〇　− 0 (CH2CH2) - 0CIlsCHz OCllzCL -OCHzCH* 〇　− 〇 〇 〇C11□C11□0 0CII□CII□ 0CIIiCIlt OCIIyCL n-C3117 C, 115 Nl(CJs OCffll? n-C11L+ -Clh -OCzlls -n-Cnllq -CxHq n-Ca II 9 C.II.

CI+3 Cd1s -NlIC,1Iq i-C3117 TS-17 TS-+8 TS-27 SO□C11゜ CH,CONH2 5O, NH.

0CONI+□ QC112cONHz N(So□C1hh NIICOC1+3 -NH5O□C11i CON11□ N1 (COCHHz 0NH2 Ball stop 9 2nd place 3rd place 5th place Ctlz Continued 0COCII zc:tl 2 n-C2It-t C2115 1fHc, II.

xHS C3H] tllS n-C1117 zlls Cz II 5 C) 13 CIIICII□CZ “Yu　;7 at 5° Next, a synthesis example of the thermal solvent of the present invention will be shown.

(I) Synthesis of TS-1 n-propanesulfonyl chloride 60g1 acetate 760
0mj! , 50 g of 7-hydroxybenzamide was cooled to 10°C while stirring. Add 25% sodium hydroxide aqueous solution 86+++ A' there at 10°C to 15°C.
It was dripped. After the addition, the reaction mixture was poured into 6β water, and the solid that formed was obtained by filtration. This solid was recrystallized with a mixed solvent of water/acetonitrile = 3/1, and the target product 60
I got g.

(2) Synthesis of TS-21 105 g of 4-propanesulfamoylphenol.

75g of 2-bromoacetamide, 138g of potassium carbonate
was stirred in N,N-dimethylformamide 1E at 50°C for 3 hours. After cooling and filtering out inorganic salts, 57! of water. The crystallized solid was obtained by filtration. The crude crystals were recrystallized from alcohol to obtain 54 g of the desired product.

(3) Synthesis of TS-6 50 g of N-methyl-3-hydroxyhenzamide and 46 g of potassium carbonate were mixed with 600 m of acetone! ! While stirring at room temperature, 2-bromoethyl-methylsulfone 75
g was added dropwise over 30 minutes, and then heated under reflux for 2 hours.

After cooling, the inorganic salts were removed by filtration, and the acetone solution was concentrated under reduced pressure to obtain crude crystals. The crude crystals were recrystallized from acetonitrile to obtain 38 g of the desired product.

Next, when the thermal solvent of the present invention is contained in a heat-developable photosensitive material, it may be contained in any photographic constituent layer, and it may be contained in any photosensitive layer or non-photosensitive layer (protective layer, intermediate layer, etc.). It can be included. The thermal solvent of the present invention is usually preferably 20% to 5% by weight of the total binder amount constituting the photothermographic material.
00% by weight, more preferably 40% to 250% by weight
It is added between.

The thermal solvent of the present invention is generally sparingly soluble in water, and is preferably ground into fine particles in an aqueous colloid layer medium using a ball mill, sand mill, etc., and then added as a QJ liquid.

Two or more of the above thermal solvents of the present invention can also be used in combination.

In the heat-developable photosensitive material of the present invention, in addition to the above-mentioned heat solvent of the present invention, a heat solvent other than that of the present invention can be used in combination. In this case, the thermal solvent of the present invention is preferably used in an amount of 50% or more, more preferably 70% or more of the total amount of thermal solvent.

In carrying out the heat development method of the present invention, when a flat plate having a layer containing a thermal solvent of the present invention and a photothermographic material are overlapped and thermally developed, the flat plate may be a single layer;
Moreover, it can also be composed of two or more layers. The flat plate preferably has one or more image-receiving layers capable of receiving dyes and the like.

When adding the thermal solvent of the general formula (I) of the present invention to the flat plate, the thermal solvent of the present invention can be added to any part of the flat plate, but preferably the flat plate has an image-receiving layer. In addition, the thermal solvent of the present invention is added to the image-receiving layer and/or the layer adjacent thereto.

When carrying out the heat development method of the present invention, when the compound of the present invention is contained in the image-receiving layer as described above, the image-receiving layer may be either hydrophobic or hydrophilic. Any material may be used as long as it has the function of receiving the dye, etc. in the photosensitive layer of the heat-developable photosensitive material released or formed by heat development. For example, polymers containing tertiary amines or quaternary ammonium salts as described in US Pat. No. 3,709,690 are preferably used. For example, as a polymer containing a quaternary ammonium salt, polystyrene-N, N, N-1-ly-n-hexyl-N
-The ratio of vinyl-hensyl ammonium chloride is 1
=4-4;1 preferably 1:1. Examples of polymers containing tertiary amines include polyvinylpyridine. Further, as an image-receiving layer, there is one obtained by mixing a polymer containing ammonium salt, tertiary amine, etc. with gelatin, polyvinyl alcohol, etc., and coating the mixture on a support.

The image-receiving layer particularly preferably used in the present invention is preferably a heat-resistant organic polymer material having a glass transition temperature of 40°C or more and 250°C or less, described in JP-A-57-207250, for example, from the viewpoint of water resistance. . These polymers may be supported on a support as an image-receiving layer, or may themselves be used as a support.

Examples of the heat-resistant polymer substances include polystyrene, polystyrene derivatives having a substituent having 4 or less carbon atoms, polyvinylcyclohexane, polyvinylbenzene, polyvinylpyrrolidone, polyvinyl JIi carbazole, polyallylbenzene, polyvinyl alcohol, polyvinyl formal, and polyvinyl. Polyacetals such as butyral, polyvinyl chloride, chlorinated polyethylene, polytrichloride fluoroethylene, polyacrylonitrile, poly-NN-
Dimethylallylamide, polyacrylate with p-cyanophenyl group, pentachlorophenyl group and 2,4-dichlorophenyl group, polyacrylchloroacrylate, polymethyl methacrylate, polyethyl methacrylate, polypropyl methacrylate, polyisopropyl methacrylate, polyisobutyl methacrylate, poly
ter - Polyesters such as butyl methacrylate, polycyclohexyl methacrylate, polyethylene glycol dimethacrylate, poly-2-cyano-ethyl methacrylate, polyethylene terephthalate, polycarbonates such as polysulfone, bisphenol A polycarbonate, polyanhydrides, polyamides, and cellulose. Examples include acetates. In addition, ``Polymer Handbook, Second Edition'' (edited by Joy Brandrup and E.H. Immergant) published by John Willian and Sands (Polymer
Handbook 2nd ed, (J, Bra
ndrup, E, 11° Immergut [) J
Also useful are synthetic polymers with glass transition temperatures of about 40° C. or higher, such as those described in J. Ohn Wiley & 5ons]. Generally, the molecular weight of the polymer substance is 2,
000 to 200.000 are useful. These polymeric substances may be used alone or in a blend of two or more thereof, or may be used in combination of two or more as a copolymer.

Useful polymers include cellulose acetate-11 such as triacetate and diacetate; polyamides made from combinations of butamethylene diamine and terephthalic acid, fluorene dipropylamine and adipic acid, hexamethylene diamine and diphenic acid, hexamethylene diamine and isophthalic acid, etc. , polyester made from a combination of diethylene glycol and diphenylcarboxylic acid, bis-p-carboxyphenoxybutane and ethylene glycol, etc.
Mention may be made of polyethylene terephthalate and polycarbonate. 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.

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

When the image-receiving layer is provided on the support, a solution coating method is preferably used from the viewpoint of performance stability, production cost, and the like.

In this case, various solvents can be selected depending on the support on which the image-receiving layer is formed, including methylene chloride,
Generally used organic solvents such as methyl ethyl ketone and tetrahydrofuran can be appropriately selected and used.

The image-receiving layer contains ultraviolet absorbers (for example, hensifenone compounds and benzotriazole compounds), dye image stabilizers (for example, phenol compounds, bisphenol compounds, hydroquinone compounds, gallic acid derivatives, hydroxychroman compounds, polyalkylpiperidine compounds, dialkoxybenzene compounds, hydroxyindan compounds, etc.), plasticizers (e.g. dibutyl phthalate, di(2-ethylhexyl) phthalate, tricresyl phosphate, etc.), development accelerators, reducing agents, etc. It can be added as necessary.

As the support for forming the image-receiving layer, any material such as a transparent support or an opaque support may be used, and examples thereof include films such as polyethylene terephthalate, polycarbonate, polystyrene, polyvinyl chloride, polyethylene, and polypropylene; Supports containing pigments such as titanium oxide, barium sulfate, calcium carbonate, talc, etc., pure baryta paper, RC (resin coat) paper laminated with thermoplastic resin containing pigments on paper, metals such as aluminum, supports on which electron beam curable resin U microorganisms containing pigments are coated and cured, and coating layers containing pigments are provided on these supports. Examples include supports such as Furthermore, cast coated paper described in Japanese Patent Application No. 126972/1984 is also useful as a support.

A flat plate containing a heat-developable photosensitive material and the above-mentioned image-receiving layer (hereinafter referred to as "
It is also sometimes referred to as "image receiving member". ) can be constructed so that all of the dye image formed with the heat-developable photosensitive material is transferred to the entire surface or a part of the image receiving member, and it is also possible to transfer all of the dye image formed with the heat-developable photosensitive material onto the entire surface or part of the image receiving member. It is also possible to adopt a configuration in which the portion is transferred to the entire surface or a portion of the image receiving member.

Furthermore, the heat-developable photosensitive material and the image-receiving member can be of any size, and both may be substantially the same size. They can also be of different sizes. Furthermore, the two do not necessarily have to be similar in shape.

Next, the dye-providing substance contained in the heat-developable color photosensitive material of the present invention will be explained. As the dye-donating substance that can be used, for example, JP-A No. 62-44737
No. 62-129852 and No. 62-169158, which form non-diffusible dyes,
For example, the leuco dyes described in U.S. Pat. No. 475,441,
Alternatively, for example, an ab dye used in the heat-developable dye bleaching method described in U.S. Pat. It is preferable to use a dye-providing substance, and it is particularly preferable to use a compound that forms a diffusible dye by a coupling reaction.

Diffusible dye-providing substances that can be used in the present invention will be explained below. The diffusible dye-donor substance may be one that is capable of forming or releasing a diffusible dye as a function of the reduction reaction of the photosensitive silver halide and/or the organic silver salt used if necessary. Depending on their reaction form, they can be classified into negative-working dye-donating substances and positive-working dye-donating substances.

As a negative dye-donating substance, for example, U.S. Pat.
No. 63,079, No. 4,439,513, JP-A-59
-60434, 59-65839, 59-71
No. 046, No. 59-87450, No. 59-88730
Examples include reducible dye-releasing compounds described in the specifications of No. 59-123837, No. 59-124329, No. 59-165054, and No. 59-164055.

Other negative dye-providing substances include, for example, U.S. Pat.
, No. 474,867, JP-A-59-12431, No. 5
No. 9-48765, No. 59-174834, No. 59-
No. 776642, No. 59-159159, No. 59-2
Examples include coupled dye-releasing compounds described in specifications such as No. 31040.

Another particularly preferred negative-tone dye-providing substance of the coupled dye-forming compound is one represented by the following general formula (a).

General formula (a) cp-←Jchi□---÷B) In the formula, Cp is an organic group (coupler) that can react with the oxidized form of the reducing agent (coupling reaction) to form a diffusible dye. J represents a divalent bonding group bonded to the active position that reacts with the oxidized form of the reducing agent, and B represents a ballast group. Here, the ballast group is a group that substantially prevents the dye-providing substance from diffusing during heat development processing, and includes groups that exhibit this effect depending on the nature of the molecule (such as a sulfo group),
Refers to groups that exhibit their effects depending on their size (groups with a large number of carbon atoms, etc.). The coupler residue represented by Cp preferably has a molecular weight of 700 or less, more preferably 500 or less, in order to improve the diffusibility of the dye formed.

The ballast group preferably has 8 or more carbon atoms, more preferably 12 or more carbon atoms, and even more preferably a group that is a polymer chain.

The cambling dye-forming compound having a group that is a polymer chain is preferably one having a polymer chain having a repeating unit derived from a monomer represented by general formula (b) as the above group.

General formula (b) Cp-←J-)-(-Ys, +2←→L) In the formula, cp
, J has the same meaning as defined in general formula (a), and Y
represents an alkylene group, an arylene group, or an aralkylene group, l represents O or 1, Z represents a divalent organic group, and L represents an ethylenically unsaturated group or a group having an ethylenically unsaturated group.

Specific examples of coupling dye-forming compounds represented by general formulas (a) and (b) include JP-A-59-124339
No. 59-181345, No. 60-2950, No. 61-57943, No. 61-59336, etc., U.S. Pat.
8 and 4.656.124, particularly U.S. Pat. No. 4,656,124, U.S. Pat. No. 4,631,251, and U.S. Pat.
The polymeric dye-providing substances described in each specification of No. 48 are preferred.

As a positive dye-donating substance, for example, JP-A-59-
No. 55430, No. 59-165054, No. 59-15
No. 4445, No. 59-766954, No. 59-116
No. 655, No. 59-124327, No. 59-1524
Examples include compounds described in publications such as No. 40.

These dye-donating materials may be used alone or in combination of two or more kinds. The amount used is not limited and depends on the type of dye-providing substance, whether it is used alone or in combination, and whether the photographic constituent layer of the light-sensitive material of the present invention is a single layer or a multilayer of two or more. For example, the amount used is 0.005 to 50 g per 1 d, preferably 0.00 g to 50 g per d.
It can be used in an amount of 1 g to 1.0 g.

The dye-providing substance used in the present invention can be incorporated into the photographic constituent layer of the heat-developable light-sensitive material using any method. , tricresyl phosphate, etc.).
Either by emulsifying and dispersing it, or by dissolving it in an alkaline aqueous solution (e.g., 10% aqueous sodium hydroxide solution, etc.) and then neutralizing it with an acid (e.g., citric acid or nitric acid, etc.).
or an aqueous solution of a suitable polymer (e.g. gelatin,
It can be used after being solidly dispersed in polyvinyl butyral, polyvinyl pyrrolidone, etc.).

Next, the photosensitive silver halide contained in the heat-developable color photosensitive material of the present invention will be described. Any silver halide can be used, such as silver chloride, silver bromide, silver iodide,
Examples include silver chlorobromide, silver chloroiodide, silver iodobromide, and the like. The photosensitive silver halide can be prepared by any method commonly used in the photographic art.

Furthermore, it is possible to use an emulsion containing grains having a multilayer structure in which the halogen composition of the grains differs on the surface and inside. For example, a silver halide emulsion having core/shell type silver halide grains in which the halogen composition changes stepwise or continuously can be used.

In addition, the shape of photosensitive silver halide is cubic, spherical, 8
It is possible to use materials that have a clear crystal habit, such as a hedron, dodecahedron, and tetradecahedron, or those that do not. This type of silver halide is described in JP-A-60-215948.

Also, for example, JP-A-58-111933, JP-A No. 58-1
No. 11934, No. 58-108526, Research Disclosure No. 22534, etc., each of which has two parallel crystal planes, and each of these crystal planes is larger than the other single crystal of this particle. It is also possible to use a silver halide emulsion containing tabular silver halide grains having a large area and an aspect ratio, that is, a ratio of grain diameter to thickness of 5=1 or more.

Further, in the present invention, a silver halide emulsion containing internal latent image type silver halide grains whose surfaces have not been fogged in advance can be used. For internal latent image type silver halide whose surface is not fogged in advance, for example, U.S. Pat.
．． No. 592,250, No. 3,206.313, No. 3,
No. 317,322, No. 3,511,622, No. 3.4
No. 47,927, No. 3,761i266, No. 3,70
It is described in each specification such as No. 3.584 and No. 3,736.140.

Internal latent image type silver halide grains whose surfaces are not fogged in advance are silver halide grains in which the sensitivity inside the grain is higher than the sensitivity on the surface of the silver halide grain, as described in each of the above specifications. be. Also, U.S. Patent No. 3,271,15
7, 3.4, 17.927 and 3,531
, 291, or silver halide emulsions containing silver halide grains containing polyvalent metal ions, or halogenated emulsions containing dopants, as described in U.S. Pat. Silver halide emulsion with weakly chemically sensitized silver grain surfaces, or JP-A-1985-1985
Silver halide emulsions comprising grains having a laminated structure described in publications such as No. 24 and No. 50-38525;
Other JP-A-52-156614 and JP-A-55-12
Silver halide emulsions such as those described in No. 7549 can be used.

The silver halide in the above-mentioned photosensitive emulsion may have coarse or fine grains, but the preferred grain size is from about 0.005 μm to about 1.5 knots, more preferably from about 0.005 μm to about 1.5 knots. It is about O0 old μm to 0.5 μm.

In the present invention, as another method for preparing photosensitive silver halide, a photosensitive root salt-forming component may be allowed to coexist with an organic silver salt described below to form photosensitive silver halide in a part of the organic silver salt.

These photosensitive silver halides and photosensitive root salt-forming components can be used in combination in various ways, and the amount used is preferably from 0.001 g to 50 g, and more preferably from 0.001 g to 50 g per layer, based on the support IM. Preferably it is 0.1 to 10 g.

The light-sensitive silver halide emulsion may be chemically sensitized by any method in the photographic art.

Further, the photosensitive silver halide emulsion used can be spectral sensitized using a known spectral sensitizing dye to impart sensitivity to blue, green, red, and near-infrared light.

Typical spectral sensitizing dyes that can be used include, for example, cyanine, merocyanine, complex (that is, trinuclear or tetranuclear) cyanine, holobola-cyanine,
Examples include styryl, hemicyanine, oxonol, and the like.

The preferred amount of these sensitizing dyes to be added is lXl0- per mole of photosensitive silver halide or silver halide forming component.
'Mole - 1 mole. More preferably, I Xl0-
'~lXl0-' mole.

The sensitizing dye may be added at any stage of the preparation of the silver halide emulsion. That is, it may be carried out at any time, such as when silver halide grains are formed, when soluble salts are removed, before the start of chemical sensitization, during chemical sensitization, or after the end of chemical sensitization.

It is preferable to use various organic silver salts in the heat-developable photosensitive material of the present invention, if necessary, for the purpose of increasing sensitivity and improving developability.

As the organic silver salt that can be used, JP-A-53-4
No. 921, No. 49-52626, No. 52-14122
No. 2, No. 53-36224, No. 53-37626, No. 52-141222, No. 53-36224, and No. 53-37610, as well as US Pat.
No. 330,633, No. 3,794,496, No. 4
Silver salts of long-chain aliphatic carboxylic acids and silver salts of carboxylic acids having heterocycles, such as silver behenate, α-(I-phenyl Tetrazolethio) silver acetate, etc.
No. 6582, No. 45-12700, No. 45-1841
No. 6, No. 45-22185, JP-A-52-13732
No. 1, No. 58-118638, No. 58-118639
There are silver salts of imino groups described in the following publications: No. 4,123,274.

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

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

The amount of the organic silver salt used is generally preferably 0.01 to 500 moles, more preferably 0.1 to 100 moles per mole of photosensitive silver halide. More preferably 0.
It is 3 to 30 moles.

The heat-developable photosensitive material of the present invention includes a reducing agent (a reducing agent precursor is also included in the reducing agent herein).
can be contained. As the reducing agent, those commonly used in the field of photothermographic materials can be used.

Examples of reducing agents that can be used include those described in U.S. Pat. No. 3,531,286, U.S. Pat. Rotating magnet 15108
, Kaimagne 15127 and Japanese Patent Application Laid-open No. 56-27132,
U.S. Pat. No. 3,342.599, U.S. Pat. No. 3,719,
Specifications of No. 492, JP-A-53-135628, JP-A No. 5
p-phenylenediamine-based and p-aminophenol-based developing agents, phosphoramidophenol-based, and sulfonamide aniline-based developing agents, as well as hydrazone-based color developing agents and their precursors, as described in publications such as No. 7-79035, Alternatively, phenols, sulfonamide phenols, polyhydroxybenzenes, naphthols, hydroxybinaphthyls, methylene bisnaphthols, methylene bisphenols, ascorbic acid, 3-virapritones, and pyrazolones can be used.

Further, the dye-donating substance may also serve as a reducing agent.

As a particularly preferable reducing agent, JP-A-56-146133
N-(p-
N.

N-dialkyl) phenylsulfamate can be mentioned.

Two or more types of reducing agents may be used simultaneously.

The amount of the reducing agent used depends on the type of photosensitive silver halide used, the type of organic acid silver salt, and the type of other additives, and is not necessarily constant, but it is usually preferable to use photosensitive silver halide 1. The amount is in the range of 0.01 to 1500 mol, more preferably 0.1 to 200 mol.

Binders that can be used in the heat-developable photosensitive material of the present invention include polyvinyl butyral, polyvinyl acetate, ethyl cellulose, polymethyl methacrylate,
These include cellulose acetate butyrate, polyvinyl alcohol, polyvinylpyrrolidone, gelatin, gelatin derivatives such as phthalated gelatin, cellulose derivatives, proteins, starches, synthetic or natural polymeric substances such as gum arabic, and these may be used alone or in combination. The above can be used in combination. In particular, it is preferable to use gelatin or a derivative thereof together with a hydrophilic polymer such as polyvinylpyrrolidone or polyvinyl alcohol, and more preferably to use a mixed binder of gelatin and polyvinylpyrrolidone described in JP-A-59-229556. That's true.

The preferred amount of the binder used is usually 0.05 g to 50 g per 1 support, more preferably 0.2 g to 50 g.
It is 20g.

In addition, the binder is
It is preferable to use ~10g, more preferably 0.2
~5g.

The heat-developable photosensitive material of the present invention can be obtained by forming a photographic constituent layer on a support, and examples of the support that can be used here include polyethylene film, cellulose acetate film, polyethylene terephthalate film, and polyethylene terephthalate film. Synthetic plastic films such as vinyl chloride, paper supports such as photographic Kawahara paper, printing paper, baryta paper, and resin coated paper, and supports obtained by coating and curing electron beam curable resin compositions on these supports. Examples include the body.

In the present invention, the heat-developable photosensitive material can be used as a transfer type photosensitive material using an image receiving member.

Note that the above-mentioned organic silver salt may be used after being dispersed in the same dispersion liquid as the above-mentioned thermal solvent. The same binder dispersion medium and dispersion device as used for making each dispersion can be used.

In addition to the above-mentioned components, the heat-developable photosensitive material may contain various additives, such as a development accelerator, an antifoggant, and a base precursor, as required.

As development accelerators, compounds described in JP-A-59-177550, JP-A-59-111636, JP-A-59424333, and JP-A-61-15964259642 are used.
It is also possible to use the development accelerator-releasing compound described in Japanese Patent Application No. 62-203908, or the metal ion having an electronegativity of 4 or more described in Japanese Patent Application No. 104645/1984.

As the antifoggant, for example, U.S. Patent No. 3.645.
Higher fatty acids described in specification No. 739, Japanese Patent Publication No. 4
Second mercury salt described in Publication No. 741113, JP-A-51-
N-halogen compounds described in No. 47419, U.S. Patent No. 3,700.457, and JP-A-51-507
Mercapto compound-releasing compounds described in Japanese Patent No. 25, arylsulfonic acids described in Japanese Patent No. 49-125016, lithium carboxylic acid salts described in Japanese Patent No. 51-47419, British Patent No. 1,455,271 , the oxidizing agent described in JP-A-50-101,019;
Sulfinic acids or thiosulfonic acids described in Publication No. 19825, 2-thiouracils described in Publication No. 51-3223, simple sulfur described in Publication No. 5126019, No. 51-42529, No. 51-81124, No. 55-
Disulfide and polysulfide compounds described in Publication No. 93149, rosins or diterpenes described in Publication No. 51-57435, polymer acids having free carboxyl groups or sulfonic acid groups described in Publication No. 51-104338, and US Pat. 4,138.265; 1.2.4-) lyazole or 5-mercapto- as described in JP-A-54-51821 and U.S. Pat. No. 4,137,079; 1,2,ll-riazole, JP-A-55-14088
Thiosulfinate esters described in No. 3, No. 55-1
1,23.4-thiatriazoles described in JP 42331, dihalogen compounds or trihalogen compounds described in JP 59-46641, JP 59-57233, JP 59-57234, and JP 59-1116.
Thiol compound described in Publication No. 36-601985
Hydroquinone derivatives described in Publication No. 40G, 60-
Examples include the combined use of a hydroquinone derivative and a hensitriazole derivative described in Japanese Patent No. 227255.

Still another particularly preferred antifoggant is disclosed in JP-A No. 6
The inhibitor having a hydrophilic group described in JP-A No. 2-78554, the polymer inhibitor described in JP-A-62-121452, and the inhibitor having a ballast group described in JP-A-62-123456 are Can be mentioned.

Furthermore, colorless couplers described in Japanese Patent Application No. 62-320599 are also preferably used.

Examples of base precursors include compounds that decarbonize upon heating and release basic substances (e.g., guanidinium trichloroacetate), compounds that decompose through reactions such as intramolecular nucleus displacement reactions and release amines, etc. For example, Japanese Patent Application Publication No. 56-130745, Japanese Patent Application Publication No. 56-132332, British Patent No. 2,079,480, US Patent No. 4,0
Specification No. 60,420, JP-A-59-157637,
No. 59-166943, No. 59-180537, No. 59-174830, No. 59-195237, No. 6
Examples include base releasing agents described in JP2-108249, JP62-174745, and the like.

In addition, various additives used in heat-developable photosensitive materials as necessary, such as antihalation dyes, fluorescent brighteners, hardeners, antistatic agents, plasticizers, spreading agents, matting agents, and surfactants. , an antifading agent, etc., and these are specifically described in RD (Research Disclosure) Magazine Vol.

170. June 1978 NLX No. 17029, JP-A-6
2-135825, etc.

These various additives may be added not only to the photosensitive layer but also to non-photosensitive layers such as an intermediate layer, a protective layer or a backing layer.

The heat-developable photosensitive material in the present invention contains (al photosensitive silver halide, fb) a binder and (C) a dye-providing substance. Furthermore, it is preferable to contain (d) a reducing agent and (e) organic silver as necessary. Basically, these may be contained in one heat-developable photosensitive layer, but they do not necessarily need to be contained in a single photographic constituent layer. For example, if the heat-developable photosensitive layer is divided into two layers, a), (b), (d
The component L(e) is contained in one heat-developable photosensitive layer, and the dye donor 'I(c) is contained in the other layer adjacent to this photosensitive layer.
They may be contained in two or more constituent layers as long as they are in a state where they can react with each other.

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

The heat-developable photosensitive material of the present invention can have one or more heat-developable photosensitive layers, and in the case of a full-color photosensitive material, it generally includes three heat-developable photosensitive layers with different color sensitivities, In each photosensitive layer, dyes having different hues are formed or released by thermal development.

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

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

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

In the present invention, the heat-developable photosensitive material is usually preferably 80°C to 200°C, more preferably 100°C to
Development can be carried out simply by heating in a temperature range of +70°C, preferably for 1 second to 180 seconds, more preferably for 1.5 seconds to 120 seconds. The transfer of the diffusible dye to the image-receiving layer may be performed simultaneously with heat development by bringing the image-receiving member into close contact with the photosensitive surface of the photosensitive material and the image-receiving layer during heat development.
Alternatively, the image may be transferred by being brought into close contact with an image receiving member after thermal development, or by being brought into close contact with an image receiving member after supplying water and further heated if necessary. Also, before exposure,
Preheating may be performed in the temperature range of °C. In addition, as described in JP-A-60-143338 and JP-A-61-162041, in order to improve mutual adhesion, the photosensitive material and image receiving member are heated at 80°C to 250°C immediately before thermal development transfer.
Each may be preheated at a temperature of °C.

Various heating means can be used for the heat-developable photosensitive material.

As the heating means, any method that can be applied to ordinary heat-developable photosensitive materials can be used, such as contacting with a heated block or plate, contacting with a heated roller or drum, or passing through a high-temperature atmosphere. Alternatively, high-frequency heating may be used, or furthermore, a conductive layer containing a conductive substance such as a carbon blank may be provided on the back surface of the photosensitive material of the present invention or the back surface of the image receiving member for thermal transfer, and the Joule heat generated by energization may be utilized. You can also do that. There are no particular restrictions on the heating pattern, such as preheating (breheating) and then reheating, or heating at a high temperature for a short time or at a low temperature for a long time, continuously increasing the temperature, or continuously heating. It is also possible to lower the temperature in a continuous manner or to repeat these steps, and discontinuous heating is also possible, but a simple pattern is preferable. Alternatively, a method in which exposure and heating proceed simultaneously may be used.

The heat-developable photosensitive material in the present invention is RD (IJ search).
Disclosure Magazine> No. 15108, JP-A-57-
No. 198458, No. 57-207250, No. 61-8
It can be a so-called monosheet type photothermographic material in which a photosensitive layer and an image-receiving layer are formed on the same support, as described in Japanese Patent No. 0148.

It is preferable to provide a protective layer on the heat-developable photosensitive material.

Various additives used in the photographic field can be used in the protective layer. The additives include various matting agents, colloidal silica, shearing agents, organic fluoro compounds (especially fluorine surfactants), antistatic agents, ultraviolet absorbers,
High-boiling organic solvents, antioxidants, hydroquinone derivatives,
Polymer latex, surfactants (including polymeric surfactants), hardeners (including polymeric hardeners), organic silver salt particles, non-photosensitive silver halide particles, antifoggants, development accelerators, etc. can be mentioned.

Regarding these additives, please refer to RD (Research Disclosure) Vol. 170. June 11, 1978.
It is described in No. h17029 and JP-A-62-135825.

〔Example〕

Hereinafter, specific examples and comparative examples of the present invention will be described. However, as a matter of course, the present invention is not limited to the examples described below.

Example-1 ■ Preparation of silver iodobromide emulsion At 56°C, JP-A No. 57-92523, No. 57-
Using the mixer shown in the specification of No. 92524, 20 g of ossein gelatin, 2,000 g of ion-exchanged water, and ammonia were dissolved in solution (A), and 5.8 g of potassium iodide was added.
(B) is an aqueous solution containing 233.2 g of potassium bromide. ! and (C) solution 1, which is an aqueous solution containing 1 2 moles of nitric acid and 4 moles of ammonia.
000 ml was added at the same time while keeping the pAg constant.

The shape and size of the emulsion grains to be prepared are determined by pH, pAg and (
It was adjusted by controlling the addition rate of liquid B) and liquid (C). In this way, a flower-dispersed silver iodobromide emulsion (average grain size of about 0.24 μm) with a silver iodide content of 2 mol % was obtained. The emulsion thus prepared was desalted and heated to p A g at 40°C.
= 6.8 to make 1400 ml.

■Preparation of photosensitive silver halide dispersion 700ml of silver iodobromide emulsion prepared as above!
The following components were sequentially added to the solution for chemical sensitization, spectral sensitization, etc. to prepare red-, green-, and blue-sensitive photosensitive silver halide emulsion dispersions. (Each chemical ripening temperature and time are described below). To each dispersion, 0.9 g of 4-hydroxy-6-methyl-1,3,3a,7-titrazaindene and 0.1 g of potassium bromide were added as stabilizers at the end of chemical ripening.

(a) Preparation of red-sensitive silver iodobromide emulsion (chemical ripening: 60°C, 130 minutes) Said silver iodobromide emulsion 700 rnl1
4-Hydroxy-6-methyl-1゜3.3a,7-chitrazaindene 0.1 g Gelatin 32 g Sodium thiosulfate 10 ■Potassium chloroaurate
2.3 ■ Ammonium thiocyanate
10 ■The following sensitizing dye (a) Methanol 1 x 1 Ion-exchanged water (b) Preparation of green-sensitive silver iodobromide emulsion (Chemical ripening: 53°C1 The above silver iodobromide emulsion 4-hydroxy-6-methyl-1 .

3, 3a. 7-Chitrazaindene gelatin sodium thiosulfate Potassium chloraurate Ammonium thiocyanate The following sensitizing dye (b) 1% methanol solution ion exchange water (C) Preparation of blue-sensitive silver iodobromide emulsion (Chemical ripening: 57℃, The silver iodobromide emulsion 4-Hydroxy-6-methyl-1.

3,3a,7-chitrazaindene 0 ml N 85 min) 700 ml 0,08g 2 g 0 mg 1,6 ■ 10 ■ 80m# 200mA 180 min) 700 nj! 0.13g Gelatin Sensitizing dye (C) 1% methanol solution Sodium periosulfate Potassium chloraurate Ammonium thiocyanate Ion-exchanged water 3.4 Sensitizing dye (a) Enhancing dye (b) Sensitizing dye (c) ■ Preparation of organic silver salt dispersion 28.8 g of 5-methylbenzotriazole silver obtained by reacting 5-methylbenzotriazole and silver nitrate in a water alcohol mixed solvent and poly(N vinylpyrrolidone)
4.0 g, and 0.65 5-methylbenzotriazole
Disperse g with an alumina ball mill and adjust the pH to 5.5 to 2.
00- Closed.

■Preparation of thermal solvent dispersion-1 25g of the thermal solvent shown in Table 2 below is dispersed in 100% polyvinylpyrrolidone aqueous solution containing 0.04g of surfactant-1 using an alumina ball mill. 120
It was set as m7.

■-(I) Preparation of dye-providing substance dispersion ~1 35.5 g of the following polymeric dye-providing substance (I), the following color stain preventive agent W
-1 2.4g to 200ml of ethyl acetate! and G (
2-Ethylhexyl) phthalate 15m dissolved in A', Alkanol XC (manufactured by DuPont) 5% aqueous solution 1
24m j! , 6% gelatin aqueous solution? 20+yl and emulsified and dispersed with an ultrasonic homogenizer, and after distilling off ethyl acetate, the pH was adjusted to 5.5 to 795III,
Dye-providing substance dispersion-1 was obtained.

Anti-staining agent W-1 Polymer dye-donating substance (I) ■-(2) Dye-providing substance dispersion-2 Dye-providing substance dispersion liquid except that the dye-providing substance was changed to the following polymeric dye-providing substance (2) This is the same dye-providing substance dispersion as in -1.

Polymer dye-donor substance (2) υ■ y=40% by weight ■-(3) Dye-donor dispersion-3 This is the above-mentioned dye-donor dispersion-1, and the dye-donor is replaced with the following polymer dye-donor. Except for changing to t(3),
It was obtained in the same manner as above.

Polymer dye-donor substance (3) ■ Preparation of reducing agent solution 20.0 g of reducing agent-1 below, 3.3 g of reducing agent-2
g 0.50 g of the following fluorine-based surfactant-2 was dissolved in water, and the pH was adjusted to 7.5 to obtain 250 ml of a reducing agent solution.

Surfactant-2 (m, n = 2 or 3) ■ Preparation of photosensitive material Using the organic silver salt dispersion, silver halide emulsion, dye-providing substance dispersion and reducing agent solution prepared above, A color photosensitive material 1 having a multilayer structure was prepared.

In addition, in the table, layers 2, 4. 5-methylbenzotriazole silver, development inhibitor (ST1), potassium bromide, and sodium chloride described in 6 and 6 are each used as a methanol solution or an aqueous solution (sodium bromide, potassium chloride) in the coating solution constituting each layer. added to.

Coating is done by simultaneously coating three layers on the support, starting from layer 1 to layer 3.
It was dried and layers 4 to 7 were applied thereon in four layers simultaneously.

The following surfactant-3 is used as a coating aid for layers 1 to 7.
In addition, a reaction product of tetrakis(vinylsulfonylmethyl)methane and taurine potassium salt (reaction ratio 1:0.75 (molar ratio)) was added as a hardening agent to each of layers 1 to 7, and 1 g of gelatin was added to each of layers 1 to 7. It was added at a rate of 0.04 g per sample.

Surfactant-3 C, II 5 C1l□C00CHz C1l (C1l□)3C1
l.

Na03S CHCOOCtlz C11 (CHz
) acH: +2H5 Below margin UV H T-1 C4119 Anti-irradiation dye ■ Oil-soluble optical brightener (UVrTEX OB.

After application, the resulting sample was stored at 25°C for 5 days and then heated at 38°C for 3 days to reach the desired level of dura mater. I forced it.

On the other hand, a polyvinyl chloride layer containing the following compound was provided as an image-receiving layer on one side (the side coated with the baryta layer) of a 10 g /rd baryta paper to form an image-receiving member side 1.

Image Stabilizer ■ Image Stabilizer Image Stabilizer-4 (0.3 g) CaH*(L) <0.2 g) Image Stabilizer Image Stabilizer-6 About the obtained heat-developable color photosensitive material samples-1 to 19 , the following evaluations were performed.

(Photographic performance) Heat-developable color photosensitive material samples 1 to 19 were exposed to blue, green, and red monochromatic light (430 mL each) through a step wedge.
Interference filters of 540 nm, 540 nm, and 640 nm, manufactured by Toshiba Glass ■, were used. ), and after being superimposed on the image receiving member, heat development was performed under the conditions shown in Table 2. After thermal development, the photosensitive member and the image receiving member were peeled off to obtain cyan, magenta, and yellow dye images (represented by R, G, and B in Table 2, respectively) on the image receiving member.

The density of the obtained dye image was measured using a reflection densitometer (PDA-65 manufactured by Konica Corporation), and the density was determined.

Maximum concentration (D,,X) and minimum concentration (D
, i, ) were obtained. The results are shown in Table 2.

The following margins are Comparative thermal solvent (I) Comparative thermal solvent Comparative thermal solvent (X = π value of NH30JIISOzNIh is -1
, 92) Comparative thermal solvent (π value of
It can be seen that although Samples 7 to 16) obtained the same maximum density as the comparative samples (11 & 16), the development time required for them was significantly shorter than that of Comparative Sample Light 6. In addition, samples using the hot solvent of the present invention (voices 7 to 16)
All exhibit excellent performance with low fog.

Further, with the thermal solvent of the present invention, continuous failure during thermal development was hardly observed. However, the comparative thermal solvent (I) suffers from severe failures and is difficult to put into practical use.

In addition, samples using the thermal solvent of the present invention (lVk+, 7 to 16
) were all good in terms of both raw sample preservation and fragility. Furthermore, the hardness of the binder was also good. However, the samples (I & 19) using the comparative hot solvent (5) had poor dura and uneven images, making it difficult to put them into practical use.

Example-2 ■Preparation of image-receiving member The amount of hot solvent shown in Table 3 was added to the polyvinyl chloride layer of image-receiving member Fish 1 used in Example-1, and new image-receiving members 2 to 1 were prepared.
6 was produced.

Using the photosensitive material prepared in Example 1 and the above-mentioned image receiving member, exposure was carried out in the same manner as in Example 1, and thermal development was performed under the conditions shown in Table 4. Thereafter, the same evaluation as in Example-1 was performed. The results are shown in Table 4.

From the results in Table 4, it can be seen that samples 5 to 15, which were thermally developed using the image receiving member containing the thermal solvent of the present invention, all obtained the same maximum density as the comparative sample 11h4, but the comparative sample It can be seen that the developing time is shorter than in No. 4.

Further, sample floors 5 to 15 according to the present invention exhibit excellent performance with low fog.

Further, volatilization of the hot solvent was observed only during the development process using the image receiving member 2. For this reason, it is difficult to incorporate the comparative thermal solvent (I) into the image receiving member.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a heat-developable color photosensitive material and a heat-developing method that provide an image with a high maximum density and a low minimum density in a short development process.

Claims (1)

[Scope of Claims] 1. A heat-developable color photosensitive material having at least one photographic constituent layer containing at least a photosensitive silver halide, a dye-providing substance, and a binder on a support, which has the following general formula (I). A heat-developable color photosensitive material containing at least one of the compounds shown below. General formula (I) ▲ Numerical formulas, chemical formulas, tables, etc. are available▼ [In the formula, X represents a group whose π value is -0.9 to -1.9. Further, R_1 represents an alkyl group, an alkoxy group (each group includes one having a substituent), or a halogen atom. Moreover, J represents a divalent group. R_2 represents an alkyl group, an alkoxy group, or an amino group (each group includes those having a substituent). l represents 0 or 1. In addition, m represents 0 or 1, but when X is -SO_2NH_2 group,
m represents 0. 2. A heat-developable photosensitive material having at least one photographic constituent layer containing at least a photosensitive silver halide, a dye-providing substance, and a binder on a support, which is represented by the general formula (I) according to claim 1. 1. A method for thermally developing a heat-developable color photosensitive material, the method comprising thermally developing a color photosensitive material in the presence of a compound.