JPS63301037A - Thermodeveloping photosensitive material having high sensitivity and less fogging - Google Patents

Abstract

PURPOSE:To improve the sensitivity and to reduce the fogging of the titled material by incorporating a specified compd. in at least one layer of photographic constituting layers. CONSTITUTION:In the thermodeveloping photosensitive material contg. a photosensitive silver halide, a reducing agent and a binder, at least one kind of the compd. shown by formula I is incorporated in at least one layer of the photographic constituting layers in an amount of >=3X10<-3>mol. per 1mol. of silver halide. In formula I, Z is an atomic group necessary for forming an aromatic ring or a heterocyclic ring, and the aromatic ring or the heterocyclic ring may be substituted and may be formed a condensed ring. Thus, the excellent titled material having the good sensitivity and the less fogging is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat-developable photosensitive material, that is, a photosensitive material from which an image is obtained by developing by heat treatment. In particular, it relates to a heat-developable photosensitive material with high sensitivity and low capri.

[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. No. 43-4924, “Fundamentals of Photographic Optics J (Published by Corona Publishing, 1879), 55
Pages 3 to 555, and Research Disclosure Magazine June 1978 issue, pages 9 to 15 (RD-17029)
It is described in 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. For example, diffusible dyes are released or formed by heat development, and then the dyes are transferred to improve image stability, sharpness, and ease of processing. It is excellent in terms of speed, etc. This transfer method heat-developable color photosensitive material and image forming method are described in, for example, JP-A-59-12431, JP-A-59-159159, JP-A-59-181345, JP-A-59-229556;
No. 60-2950, No. 61-52643, No. 61-
No. 61158, No. 61-61157, No. 59-180
No. 550, No. 61-132.952, No. 61-139
It is described in US Pat. No. 842, US Pat. No. 4,595,652, US Pat.

These heat-developable photosensitive materials consist of a photosensitive silver halide, an organic silver salt, and a binder, and further contain a dye-providing substance when used as a color photosensitive material. It is well known in the industry that silver halide emulsions are usually used after being made highly sensitive by chemical sensitization. Chemical sensitization methods include sulfur sensitization, reduction sensitization, selenium sensitization, There are noble metal sensitization methods, etc., which can be applied alone or in combination.

Furthermore, it is known that a highly sensitive emulsion can be obtained by adding azaindenes during chemical ripening of a silver halide emulsion or before coating, as described in British Patent No. 1,315,755 and Japanese Patent Application Laid-open No. 5
It is described in No. 1-77223, JP-A-60-140335, etc.

However, when conventional silver halide emulsions are used in heat-developable photosensitive materials, it is difficult to satisfy photographic properties with high sensitivity and little fog. Therefore, it has been strongly desired to increase the sensitivity of heat-developable photosensitive materials containing photosensitive silver halide.

[Purpose of the invention]

An object of the present invention is to provide a heat-developable photosensitive material that has high sensitivity and less fog.

[Structure of the invention]

The above object of the present invention is to provide a heat-developable photosensitive agent containing a photosensitive silver halide, a reducing agent, and a binder, in which at least one compound represented by the following general formula (I) is added to at least one layer of a photographic material. This can be achieved by a heat-developable photosensitive material characterized in that its constituent layers contain 3 KIQ moles or more per mole of silver halide.

General Formula (I) In the formula, Z represents a group of atoms necessary to form an aromatic ring or a heterocycle. The aromatic ring or heterocycle may have a substituent, and may form a fused ring.

The compound represented by the general formula (I) according to the present invention will be described in detail later.

In the heat-developable photosensitive material of the present invention, the photosensitive silver halide and the reducing agent do not necessarily need to be contained in the same layer. Furthermore, when the present invention is applied to color light-sensitive materials, some dye donors also serve as reducing agents, and it goes without saying that such dye donors can also be used as reducing agents in the present invention.

The heat-developable photosensitive material of the present invention can be embodied as a black-and-white photosensitive material, a monochromatic color photosensitive material 2, or a multicolor photosensitive material.

When producing a color photosensitive material, any dye donor can be used. Although it is preferred to use a diffusible dye donor,
It is not limited to that.

Further, it may be a transfer-type heat-developable photosensitive material, or it may be a non-transfer type photothermographic material. The transfer method is advantageous in terms of image quality. On the other hand, if the transfer method is not used, there is an advantage that an image receiving member is not required.

In the present invention, the compound represented by general formula (I) is contained in any layer of the photographic constituent layers.

A detailed description of the compound represented by the general formula (I) according to the present invention is as follows.

General Formula (I) As mentioned above, Z in the formula represents a collection of atoms necessary to form an aromatic ring or a heterocycle. The aromatic ring or heterocycle may have a substituent, and may form a fused ring.

Among the compounds represented by general formula (I), the following general formula (n)
Preferable compounds include those represented by:

General formula (II) ■ [In the formula, R represents a hydrogen atom, an alkyl group, an aryl group, a substituted aryl group, an alkoxy group, an aryloxy group, and n
represents 0, 1 or 2. R may form a fused ring with a benzene ring. ] Specific examples of the compounds used in the present invention represented by the general formula (I) are shown below, but the compounds are not limited to these compounds.

Compounds of H0 or higher can be easily synthesized by reacting the corresponding diamine with carbon disulfide. Some synthetic examples of these compounds will be described below.

(Synthesis example of exemplified compound (2)) 20 g of 3.4-diaminoanisole was dissolved in methanol
Heat to reflux with 0 g of carbon disulfide. After 3 hours, yellow crystals produced by the reaction were collected by filtration and recrystallized from methanol to obtain 15 g of needle-shaped crystals with a melting point of 260-262°C.

Usually, the compound represented by the general formula (I) according to the present invention is:
A compound used to prevent fog by being included in silver halide photosensitive materials. l! It was believed that adding more than 0.3x+o"a per mole of silver halide would result in a significant decrease in sensitivity. However, if the compound of the present invention is added to a heat-developable photosensitive material at a concentration of 0.3x+o"a per mole of silver halide, the sensitivity will be greatly reduced.
``By adding t=1L or more, images with high sensitivity and less fogging can be obtained, which cannot be obtained from conventional knowledge.

In addition, one type of compound may be added alone, or two types of compounds may be added alone.
More than one type of compound may be used in combination. When two or more types of compounds are used together, the total amount is within the above range.

The compound of the present invention can be added in the form of a dispersion in an organic solvent such as methanol, ethanol, propatool, acetone, fluorinated alcohol, dimethylformamide, methyl cellosolve, or in water/gelatin, or in a dispersed solution using a surfactant. It's okay.

The addition time may be any time during the silver halide emulsion manufacturing process or before coating, but preferably during chemical ripening, at the beginning, at the end, and before coating. By adding the compound represented by formula (I) before coating, a preferable photosensitive material with good sensitivity and no fogging can be obtained.

The heat-developable photosensitive material of the present invention can be embodied as a black-and-white photosensitive material or as a color photosensitive material. When producing a color photosensitive material, a dye-providing substance is used.

When the present invention is applied to a color photosensitive material, examples of the dye-providing substance include JP-A-62-44737 and JP-A-62-44737;
0-271117 and Japanese Patent Application No. 61-11563, such as the leuco dyes described in U.S. Pat. No. 475,441, or e.g. U.S. Pat. No. 4,235,957. Although an azo dye used in the heat-developable dye bleaching method described in et al. can be used as the dye-donating substance, it is more preferable to use a diffusible dye-donating substance that forms or releases a diffusible dye, and particularly It is preferable to use a compound that forms a diffusible dye through 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 participates in the reduction reaction of the photosensitive silver halide and/or the organic silver salt used if necessary, and can form or release a diffusible dye as a function of the reaction. well,
Depending on the reaction mode, negative-acting dye-donors that act on a positive function (i.e., those that form a negative dye image when using negative-working silver halide) and positive dye-donors that act on a negative function. dye-donors (that is, those that form a positive dye image when negative-working silver halide is used).

As a negative dye-donating substance, for example, U.S. Pat.
No. 63,079, No. 4,439,513, JP-A-59
-60434, 59-65.839, 59-7
No. 1046, No. 59-87, 450, No. 59-88
No. 730, No. 59-123837, No. 59-1243
No. 29, No. 59-165054, No. 59-16405
Examples include reducing dye-releasing compounds described in specifications such as No. 5.

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. 31540.

Yet another particularly preferred negative dye-donor substance is:
Next, there is a coupled dye-forming compound represented by the general formula (1).

General formula ■ Cp-←J-)-+B) In the formula, Cp represents an organic group that can react with the oxidized form of the reducing agent (coupling reaction) to form a diffusible dye, and B represents the ballast. represents a group. Here, the ballast group is a group that substantially prevents the dye-donating substance from diffusing during heat development processing, and includes groups (such as sulfo groups) that exhibit this effect depending on the nature of the molecule, and groups that exhibit this effect depending on the size of the molecule. Groups (such as 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 is preferably a group having 8 or more carbon atoms, more preferably 12 or more carbon atoms, or a sulfo group, a group containing both is even more preferable, and a group that is a polymer chain is even more preferable.

The coupling dye-forming compound having a group as a polymer chain is preferably one having a polymer chain having a repeating unit derived from a monomer represented by the general formula (2) as the above-mentioned group.

In the formula, cp and J have the same meaning as defined in the general formula (■), Y represents an alkylene group, arylene group, or aralkylene group, l represents 0 or 1, and Z represents a divalent organic group. , 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 (1) and (2) include JP-A-59-124339 and JP-A-59-124339;
No. 9-181345, No. 60-2950, No. 61-5
No. 7943, No. 61-59336, U.S. Patent No. 4,6
No. 31,251, No. 4,650゜748, No. 4,65
6.124, particularly U.S. Patent No. 4.656.124 and U.S. Patent No. 4.631.
．． The polymeric dye-providing substances described in No. 251 and No. 4,650.748 are preferred.

As a positive dye-donating substance, for example, JP-A-59-
Dye developer compounds described in publications such as No. 55430 and No. 59-165054, for example, JP-A-59-15444
Compounds that release diffusible dyes by intramolecular nucleophilic reactions described in publications such as No. 5 and No. 59-766954, cobalt complex compounds described in publications such as JP-A-59-116655, or, for example, JP-A-59-116655. No. 591124327,
There are compounds that lose their dye-releasing ability when oxidized, as described in publications such as No. 59-152440.

The residue of the diffusible dye in the dye-providing substance used in the present invention preferably has a molecular weight of 800 or less, more preferably 600 or less, in order to improve the diffusibility of the dye. Examples include residues such as azomethine dyes, anthraquinone dyes, naphthoquinone dyes, styryl dyes, nitro dyes, quinoline dyes, carbonyl dyes, and phthalocyanine dyes. These dye residues may be in a temporary short-waveform form that allows multiple colors during thermal development or transfer. In addition, these dye residues are used for the purpose of improving the light resistance of images, for example, as described in Japanese Patent Application Laid-Open Nos. 5'9-48765 and 50.
A preferred embodiment is a chelatable dye residue described in Japanese Patent No. 124337.

These dye-donating materials may be used alone or in combination of two or more. The amount used is not limited, and depends on the type of dye-providing substance, whether it is used alone or in combination, or whether the photographic constituent layer of the light-sensitive material of the present invention is a single layer or a multilayer of two or more types. Although it may be determined accordingly, the amount to be used may be, for example, 0.005 g to 50 g, preferably 0.1 g to 10 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. Cresyl phosphate, etc.) and then subjected to ultrasonic dispersion, or dissolved in an alkaline aqueous solution (e.g., 10% sodium hydroxide aqueous solution, etc.) and then neutralized with an acidic acid (e.g., citric acid or nitric acid, etc.). or an aqueous solution of a suitable polymer (e.g. gelatin, polyvinyl butyral, polyvinylpyrrolidone, etc.)
It can be used after being dispersed using a ball mill.

Next, the photosensitive silver halide used in the present invention will be described. Any silver halide can be used, and examples thereof include silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodide, and silver iodobromide. The photosensitive silver halide can be prepared by any method commonly used in the photographic field, such as a single jet method.

In a preferred embodiment of the present invention, the photosensitive silver halide contained in the heat-developable photosensitive material has a silver iodide content of 0 mol% to 40 mol%, and A6c=ke. □. Good, good. I is 6°, 1 y 7 is 4 y %. Preferred silver halide in this case is silver iodobromide or silver chloroiodobromide. For the preparation of such preferred silver halide, any of the acid method, neutral method, ammonia method, etc. may be used, but the ammonia method is particularly suitable. Further, as a method for reacting the soluble root salt and the soluble halogen salt, any one of a one-sided mixing method, a simultaneous mixing method, a combination thereof, etc. may be used. It is also possible to use a back mixing method in which silver halide grains are formed in an excess of silver ions. As one of the simultaneous mixing methods, the Chondrald double jet method can be used, in which the pAg of the solution in the reaction vessel in which silver halide is produced is arbitrarily controlled, and the addition rate of the silver and halogen solutions is controlled. According to this method, a so-called monodisperse silver halide emulsion (described later) in which silver halide grain crystals and grain sizes are nearly uniform can be obtained.

In the present invention, as the photosensitive silver halide contained in the heat-developable photosensitive material, one having a core/shell structure can be used. That is, in a preferred embodiment of the present invention, core/shell type silver halide grains are used in which the grain has a multilayer structure in which the halogen composition is different on the surface and inside. In this case, a silver halide emulsion having grains in which the halogen composition changes stepwise or continuously can be used.

In addition, its shape is cubic, spherical, octahedral, dodecahedron,
(2) It can be used whether it has a clear crystal habit such as a tetrahedron or not. This type of silver halide is described in JP-A-60-215948.

More preferred core/shell type photosensitive silver halide grains used in the present invention are core/shell type photosensitive silver halide grains having a surface latent image type shell.

A core/shell type photosensitive silver halide emulsion which is more preferably used in the present invention can be produced by coating monodisperse photosensitive silver halide grains with a shell as a core.

To form monodisperse silver halide grains as cores, grains of a desired size can be obtained by a double jet method while keeping PAg constant. Furthermore, the method described in JP-A-54-48521 can be applied to silver halide emulsions containing highly monodisperse photosensitive silver halide. A preferred embodiment of the method is a method in which a potassium iodobromide-gelatin aqueous solution and an ammoniacal silver nitrate aqueous solution are added to a gelatin aqueous solution containing silver halide seed particles while changing the addition rate as a function of time. It is manufactured by. At this time, by appropriately selecting the time function of addition rate, PH, PAg, temperature, etc.
Silver halide emulsions containing silver halide grains for highly monodisperse cores can be obtained.

By sequentially growing shells using monodisperse core grains as described above according to the manufacturing method of a monodisperse emulsion, monodisperse core/shell type photosensitive silver halide containing monodisperse core/shell type photosensitive silver halide which is more preferably used in the present invention is produced. A silver halide emulsion can be obtained.

In the core/shell type photosensitive silver halide grains more preferably used in the present invention, the thickness of the shell covering the core is 0.05% to 0.05% of the silver halide grain size.
It is preferably 90%, more preferably in the range of 1% to 80%. In the silver halide composition of the core, the content of silver iodide is preferably 0.1 mol % to 20 mol %. More preferably, in the silver halide composition of the shell, the silver iodide content of the core is preferably 0 mol % to 6 mol %.

More preferably, it is a core/shell type halide root in which the silver iodide content in the core is 2 mol% or more higher than the silver iodide content in the shell. Particularly preferably, the silver iodide content of the core is 2
mole%, the silver iodide content of the shell is 0%, the volume ratio of the core to the shell is 1:1, and therefore the total silver iodide content is 1.
% by mole.

Further, the present invention includes, for example, JP-A-58-111933;
5B-111934, 58-108526, Research Disclosure No. 22534, etc., it has two parallel crystal planes, and each of these crystal planes is different from other units of this particle. It is also possible to use a silver halide emulsion containing tabular silver halide grains having a larger area than the crystals 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 prefogged, for example, U.S. Pat.
．． 592.250, 3,206.313, 3.
No. 317,322, No. 3,511.622, No. 3.4
No. 47,927, No. 3,761.266, No. 3,70
No. 3,584, No. 3,736.140, etc., and the internal latent image type silver halide grains whose surfaces are not fogged in advance are as described in each of the above specifications. These are silver halide grains in which the sensitivity inside the grain is higher than the sensitivity on the surface of the silver halide grain. In addition, halogen containing silver halide grains containing polyvalent metal ions as described in U.S. Pat. A silver halide emulsion, or a silver halide emulsion in which the grain surface of silver halide grains containing a dopant as described in U.S. Pat. No. 3.76L276 is weakly chemically sensitized;
or JP-A-50-8524 and JP-A-50-38525
Silver halide emulsions consisting of grains having a layered structure as described in publications such as No. 1, etc., and other JP-A-52-15661
4 and the silver halide emulsion described in JP-A-55-127549.

The photosensitive silver halide used in the present invention may be chemically sensitized by any method in the photographic field.

In a preferred embodiment of the present invention, the silver halide grains contained in the photosensitive material for thermal development are gold sensitized.

In that case, other chemical sensitization may be used in combination. Preferably,
Chemical sensitization is performed using a combination of sulfur sensitization and gold sensitizer.

The oxidation number of gold in the gold sensitizer used for gold sensitization is arbitrary and may be +1 or +3, and various gold compounds can be used. Typical examples of gold sensitizers include chlorauric acid salts, potassium chlorooleate, auric trichloride, potassium auric thiocyanate, potassium iodooleate, tetracyano auric acid, ammonium aurothiocyanate, pyridyl trichlorogold, etc. .

The amount of gold sensitizer added varies depending on various conditions, but as a guide, it is approximately 0.1 to 10 mg per mole of silver halide.
Preferably 1.5 x 10-' to 4. OX10
-' [Ilg.

Any sulfur sensitizer can be used in combination with the gold sensitizer or used alone.

For example, thiosulfate, allylthiocarbamide thiourea,
Examples include allyl isothiocyanate, cystine, pt-luenethiosulfonate, and rhodanine. Other U.S. Patents No. 1,574,944, U.S. Patent No. 2,410,
No. 689, No. 2,278,947, No. 2,728
．． No. 668, No. 3,501,313, No. 3,65
6,955 specifications, German Patent No. 1,422,86
No. 9, JP-A-56-24937, JP-A-55-450
Sulfur sensitizers described in Publication No. 16 and the like can also be used. The amount of sulfur sensitizer added may be sufficient to effectively increase the sensitivity of the emulsion. This amount varies over a considerable range depending on the conditions such as pH, temperature, and silver halide grain size, but as a guide, it is approximately 0.5 to 2.0 μm per mole of silver halide. , preferably 0.
It is 7 to 1.5 ■.

When a gold sensitizer and a sulfur sensitizer are used together, either one can be added to the emulsion first (or they can be added at the same time).

The gold sensitizer is preferably a chlorauric acid salt, and the sulfur sensitizer used in combination with a gold sensitizer is preferably a thiosulfur salt.

The silver halide grains used in the present invention may be coarse or fine, but the preferred grain size is about 0.001 μm to about 1.5 μm, more preferably about 0.001 μm to about 1.5 μm. It is 0.01 μm to 0.5 μm.

In the present invention, as another method for preparing photosensitive silver halide, a technique is employed in which a photosensitive silver salt-forming component is allowed to coexist with an organic silver salt described below, and a photosensitive silver halide is formed in a part of the silver salt. It can also be used.

These photosensitive silver halide and photosensitive root salt forming components are
They can be used in combination in various ways, and the amount used is preferably 0.001 g to 50 g, more preferably 0.1 g to Log
It is.

Typical spectral sensitizing dyes used in the present invention include, for example, cyanine, merocyanine, comblenus (that is, trinuclear or tetranuclear) cyanine, holopolar cyanine,
Examples include various dyes such as styryl, hemicyanine, and oxonol.

The preferred amount of these sensitizing dyes added is I x 1 per mole of photosensitive silver halide or silver halide forming component.
0-' mole-1 mole. More preferably, lXl0
-' to lXl0-' moles.

In the heat-developable photosensitive material of the present invention, various organic silver salts can be used, if necessary, for the purpose of increasing sensitivity and improving developability.

Examples of organic silver salts that can be used in the heat-developable photosensitive material of the present invention include Japanese Patent Publication No. 43-4921, Japanese Patent Application Laid-Open No. 49-52
No. 626, No. 52-141222, No. 53-3622
Publications such as No. 4, No. 53-37610, and No. 53-37626, as well as U.S. Pat.
Silver salts of long-chain aliphatic carboxylic acids and silver salts of carboxylic acids having heterocycles, such as silver laurate, silver myristate, silver palmitate, and stearic acid, as described in the specifications of Silver, silver arachidonic acid, silver behenate, α
-(I-phenyltetrazolethio)silver acetate, etc., and silver aromatic carboxylates, such as silver benzoate, silver phthalate, etc., Japanese Patent Publications No. 44-26582, No. 45-12700, No. 45-18416, No. 45 -22185, JP-A-52-137321, JP-A-58-118638, JP-A-58-118639, U.S. Patent No. 4゜12
There is a silver salt of an imino group described in No. 3.274.

Other silver complex compounds with a stability constant of 4.5 to 10.0 as described in JP-A No. 52-31728, and imizolithion as described in U.S. Pat. No. 4,168,980. Silver salt etc. are used.

Among the above organic silver salts, imino group silver salts are preferred;
Particularly preferred are silver salts of benzotriazole derivatives, more preferably 5-methylbenzotriazole and its derivatives, sulfobenzotriazole and its 814 derivative, and N-alkylsulfamoylbenzotriazole and its derivatives.

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

In addition, as a method for preparing silver salts, a method is generally used in which silver nitrate and raw material organic compounds are dissolved and mixed in water or an organic solvent, but if necessary, a binder may be added or hydroxylated. It is also effective to add an alkali such as sodium to promote dissolution of the organic compound, or to use an asimoniacal silver nitrate solution.

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.

Reducing agent used in the photothermographic material of the present invention (reducing agent precursor is also included in the reducing agent herein)
Those commonly used in the field of heat-developable photosensitive materials can be used.

Examples of reducing agents that can be used in the present invention include U.S. Pat. Nos. 3,531,286 and 3,761,27
No. 0, the specifications of No. 3,764.328, and RD
(Research Disclosure) Nα12146,
Same No. α1510B, same No. 15127 and JP-A-1983
-27132 publication, U.S. Patent No. 3,342.599, U.S. Patent No. 3,719.492 specifications, JP-A-53-1
p-phenylenediamine-based and p-aminophenol-based developing agents, phosphoramidophenol-based, sulfonamide aniline-based developing agents, and hydrazone-based color developing agents described in publications such as No. 35628 and No. 57-79035, and the like. Alternatively, phenols, sulfonamidophenols, or polyhydroxybenzenes, naphthols, hydroxybinaphthyls and methylene bisnaphthols, methylene bisphenols, ascorbic acid, 3-pyrazolidones, and pyrazolones can be used. .

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

N-dialkyl) phenylsulfamate can be mentioned.

Two or more types of the above-mentioned reducing agents may be used simultaneously.

The amount of the reducing agent used in the heat-developable photosensitive material of the present invention depends on the type of photosensitive silver halide used, the type of organic acid silver salt, the type of other additives, etc., and is not necessarily constant. However, the amount is usually preferably from 0.01 to 1,500 mol, more preferably from 0.1 to 200 mol, per mol of photosensitive silver halide.

Binders that can be used in the heat-developable photosensitive material of the present invention include polyvinyl butyral, polyvinyl acetate,
These include synthetic or natural polymeric substances such as ethyl cellulose, polymethyl methacrylate, cellulose acetate butyrate, polyvinyl alcohol, polyvinyl pyrrolidone, gelatin, gelatin derivatives such as phthalated gelatin, cellulose derivatives, proteins, starch, and gum arabic. can be used in combination of one or more of them. 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 Haf Gu is usually 0.05 g to 50 g per 1M of support, more preferably 0.1 g.
g to 10 g.

In addition, the binder is 0.1% per 1g of the dye-providing substance.
It is preferable to use 10 g to 10 g, more preferably 0.0 g to 10 g.
It is 25g to 4g.

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, etc. Synthetic plastic films such as polyvinyl chloride, paper supports such as photographic base paper, printing paper, baryta paper, and resin coated paper, and electron beam curable resin compositions coated and cured on these supports. Examples include supports.

When the photothermographic material of the present invention and the photosensitive material are of a transfer type and an image receiving member is used, various heat solvents are preferably added to the photothermographic material and/or the image receiving member.

A thermal solvent is a compound that promotes thermal development and/or thermal transfer. These compounds include, for example, U.S. Pat. No. 3,347,675, U.S. Pat.
D (Research Disclosure) No. 176
43 (X II), JP-A No. 59-229556,
No. 59-68730, No. 59-84236, No. 60
-191251, 60-232547, 60-
No. 14241, Publication No. 61-52643, Patent Application No. 1983
No. 0-218768, No. 60-181965, No. 60
-184637, etc., U.S. Patent No. 3.438.776, U.S. Patent No. 3.666477, U.S. Pat.
No. 53-60223, No. 58-118640,
Examples of organic compounds having polarity such as those described in Japanese Patent No. 58-198038 include urea derivatives (e.g., dimethylurea, diethylurea, phenylurea) that are particularly useful in carrying out the present invention. ), amide derivatives (e.g., acetamide, benzamide, p-toluamide, p-butoxybenzamide, etc.)
, sulfonamide derivatives (e.g. benzenesulfonamide, α-toluenesulfonamide, etc.), polyhydric alcohols (e.g. 1,5-bentanediol, ■, 6-hexanediol, ■, 2-cyclohexanediol, pentaerythritol) , trimethylolethane, etc.), or polyethylene glycols.

As the above-mentioned thermal solvent, a water-insoluble solid thermal solvent is more preferably used. Here, the water-insoluble solid thermal solvent is solid at room temperature, but at high temperature (60°C or higher, preferably 100°C or higher).
°C or higher, particularly preferably 130 °C or higher and 250 °C
(below) is a compound that becomes liquid, and the ratio of inorganic/organic ("Organic Conceptual Diagram" by Yoshio Koda, Sankyo Publishing ■, 1984)
is in the range of 0.5 to 3.0, preferably 0.7 to 2.5, particularly preferably 1.0 to 2.0.

Specific examples of the above-mentioned water-soluble heat solvent include, for example,
It is described in No.-278331 and No. 60-280824.

Examples of the layer to which a heat solvent is added include a photosensitive silver halide emulsion layer, an intermediate layer, a protective layer, an image receiving layer of an image receiving member, etc., and the heat solvent is added to each layer so as to obtain an effect depending on each layer.

The preferred amount of the heat solvent added is usually 10% to 500% by weight, more preferably 30% to 200% by weight of the binder amount.
Weight%.

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

A color toning agent known in heat-developable light-sensitive materials may be added to the heat-developable light-sensitive material of the present invention as a development accelerator. As a color toning agent, for example, JP-A-46-49
No. 28, No. 46-6077, No. 49-5019, No. 50-2524, No. 50-67132, No. 50-6
No. 7641, No. 50-114217, No. 52-337
No. 22, No. 52-99813, No. 53-1020,
No. 53-55115, No. 53-76020, No. 53
-125014, 54-156523, 54-
No. 1565324, No. 54-156525, No. 54-
No. 156526, No. 55-4060, No. 55-406
Publications such as No. 1 and No. 55-32015, as well as West German Patent No. 2.140.406 and West German Patent No. 2,141.063,
No. 2,220,618, U.S. Patent No. 3,847,61
No. 2, No. 3.782,941, No. 4.201.5
Specifications such as No. 82, and JP-A-57-20724
No. 4, No. 57-207245, No. 5B-189632
There are compounds described in various publications such as No. 8 and No. 5B-193541.

Other development accelerators include compounds described in JP-A-59-177550 and JP-A-59-111636.

Further, development accelerator releasing compounds described in Japanese Patent Application No. 59-280881 can also be used.

Antifoggants include, for example, U.S. Pat. No. 3,645.
Higher fatty acids described in specification No. 739, Japanese Patent Publication No. 4
Second mercury salt described in Publication No. 7-11113, JP-A-51
-N-halogen compound described in Publication No. 47419, U.S. Patent No. 3,700,457, JP-A-51-50
Mercapto compound releasing compound described in Publication No. 725,
Aryl sulfonic acids described in JP 49-125016, carboxylic acid lithium salts described in JP 51-47419, British Patent No. 1.455.271, JP 50-101.019 The oxidizing agent described in 5.
Sulfinic acids or thiouracils described in Publication No. 3-19825, No. 51-81124, No. 55-93
Disulfide and polysulfide compounds described in Publication No. 149, 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, US patents No. 4,138.265, thiazolinthione, JP-A-54-51821, US Pat. No. 4,137.079, 1.
2.4-) Riazole or 5-mercapto-1,2
, 4-triazole, 1,2,3,4-thiatriazoles described in JP-A No. 55-142331, No. 59
-46641, 59-57233, 59-57
Dihalogen compounds or trihalogen compounds described in Publication No. 234, thiol compounds described in Publication No. 59-111636, hydroquinone derivatives described in Publication No. 60-198540, and hydroquinone derivatives described in Publication No. 60-227255. Examples include combination use with benzotriazole derivatives.

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

Furthermore, inorganic or organic bases or chlorine group precursors can be added. 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 molecular self-absorbing nuclear substitution reactions and release amines, etc. For example, JP-A-56-130745
No. 56-132332, British Patent No. 2.079
．． No. 480, U.S. Patent No. 4.060°420,
JP 59-157637, JP 59-166943, JP 59-180537, JP 59-174830,
Examples include base releasing agents described in Japanese Patent No. 59-195237 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. , anti-fading agents, etc., specifically RD (
Research Disclosure) Magazine Vol.1.170.1
June 978 Na No. 17029, Patent Application 1986-276
It is described in No. 615, etc.

The photothermographic material of the present invention has (a) ? It contains S-photosensitive A silver halide, (b) a reducing agent, and (c) a binder, and when used as a color light-sensitive material, it contains (d) a dye-providing substance.

Furthermore, it is preferable to contain (e) and (f) 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 2N,
The components (a), (b), (c), and (e) are contained in one heat-developable photosensitive layer, and the dye-providing substance (d) 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 has one or more heat-developable photosensitive layers. In the case of full-color photosensitive materials,
Generally, it has three heat-developable photosensitive layers with different color sensitivities, and in each photosensitive layer, dyes with different hues are formed or released by heat development.

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

The structure of each layer can be arbitrarily selected depending on the purpose. For example, a structure in which a red-sensitive layer, a green-sensitive layer, and a blue-sensitive layer are sequentially formed on 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 can be provided with non-photosensitive layers such as an undercoat layer, an intermediate layer, a protective layer, a filter layer, a backing layer, and a release layer.

To coat the heat-developable photosensitive layer and these non-photosensitive layers on the support, a method similar to that used for coating and preparing general silver halide photosensitive materials can be applied.

The heat-developable photosensitive material of the present invention usually preferably has a
0°C to 200°C1, more preferably 100°C to 1
Developing is carried out by simply heating in a temperature range of 70° C., preferably for 1 second to 180 seconds, more preferably for 1.5 seconds to 120 seconds. Transfer of the diffusible dye to the image-receiving layer may be carried out simultaneously with heat development by bringing the image-receiving member into close contact with the photosensitive surface of the photosensitive material and the image-receiving layer during heat development. Alternatively, the transfer may be performed by supplying water, bringing the film into close contact with the film, and further heating if necessary.Furthermore, preheating may be performed in a temperature range of 70°C to 180°C before exposure. Also, JP-A-60-1
As described in Japanese Patent Application No. 43338 and Japanese Patent Application No. 60-3644, the photosensitive material and the image receiving member are preheated at a temperature of 80°C to 250°C immediately before thermal development transfer in order to improve their mutual adhesion. You may.

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

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 carbon black may be provided on the back surface of the photosensitive material of the present invention or the back surface of the image receiving member for thermal transfer, and the Joule heat generated by energization may be utilized. You can also do that. There are no particular restrictions on the heating pattern, including preheating and then reheating, high temperature for a short time, low temperature for a long time, continuous rise, continuous fall, or both. Repeated or even discontinuous heating is possible, but a simple pattern is preferred. Alternatively, a method in which exposure and heating proceed simultaneously may be used.

When the present invention is applied to a transfer type photothermographic material, an image receiving member is provided as described above. The image-receiving layer of the image-receiving member that can be effectively used in that case may have the function of receiving the dye in the heat-developable photosensitive layer released or formed by heat development, such as a tertiary amine or quaternary ammonium salt. Among the polymers described in U.S. Pat. No. 3,709,690 are preferably used. A typical image-receiving layer for diffusion transfer is obtained by mixing a polymer containing ammonium salt, tertiary amine, etc. with gelatin, polyvinyl alcohol, etc., and coating the mixture on a support. Another useful dye-receiving material is JP-A-57-20
The glass transition temperature described in Publication No. 7250 etc. is 40°
Examples include those formed of heat-resistant organic polymer substances with a temperature of C or more and 250°C or less.

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

Examples of the heat-resistant polymer substances include polystyrene, polystyrene derivatives having a substituent having 4 or less carbon atoms, polyvinylcyclohexane, polydivinylbenzene, polyvinylpyrrolidone, polyvinylcarbazole, polyallylbenzene, polyvinyl alcohol, polyvinyl formal, and polyvinyl. Polyacetals such as butyral, polyvinyl chloride, chlorinated polyethylene, polytrichloride fluorinated ethylene, polyacrylonitrile, poly-N.

N-dimethylallylamide, polyacrylate with p-cyanophenyl group, pentachlorophenyl group and 2,4-dichlorophenyl group, polyacrylchloroacrylate, polymethyl methacrylate, polyprol methacrylate, polypropyl methacrylate, polyisopropyl methacrylate, polyisobutyl methacrylate, poly tert-butyl methacrylate, polycyclohexyl methacrylate, polyethylene glycol dimethacrylate, poly-2-cyano-ethyl methacrylate,
Examples include polyesters such as polyethylene terephthalate, polycarbonates such as polysulfone and bisphenol A polycarbonate, polyanhydrides, polyamides, and cellulose acetates. Also,"
``Polymer Handbook, Second Edition'' (Joy Brandrup, E.H. Inmargat w1) John Willian and Sands Publishing (Polym
erHandbook 2nd ed, (J,Br
andrup, E, ■, I++netgutjrijoh
Also useful are synthetic polymers having a glass transition temperature of 540° C. or higher, such as those described in Wiley & 5ons). Generally, the molecular weight of the polymer substance is 2.00.
0 to 200,000 are useful. These polymeric substances may be used alone or in a blend of two or more, or may be used in combination as a copolymer.

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

These polymers can also be used as a support and an image-receiving layer (image-receiving member), in which case the support may be formed from a single layer or from multiple layers. good.

As the support for the image receiving member, any material such as a transparent support or an opaque support may be used, but for example, films of polyethylene glycol, polycarbonate, polystyrene, polyvinyl chloride, polyethylene, polypropylene, etc., and films of these materials may be used. Supports containing pigments such as titanium oxygen, barium sulfate, calcium carbonate, and talc, baryta paper, RC paper laminated with thermoplastic resin containing pigments on paper, fabrics, glasses, metals such as aluminum, supports on which electron beam-curable resin structures containing pigments are coated and cured, and coated 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.

In addition, a support with a pigment-containing electron beam curable resin composition coated and cured on paper, or a support with a pigment coating layer on paper and an electron beam curable resin composition on the pigment coating layer. The resin layer of the support coated with and cured can be used as an image-receiving layer, so it can be used as is as an image-receiving member.

The heat-developable photosensitive material of the present invention is disclosed in RD (Research Disclosure) No. 15108, JP-A-57-198458.
It may be a so-called monotone type photothermographic material in which an angry light layer and an image-receiving layer are formed on the same support, as described in Japanese Patent No. 57-207250 and No. 61-80148. .

The heat-developable photosensitive material of the present invention is preferably provided with a protective layer.

Various additives used in the photographic field can be used in the protective layer. The additives include various matting agents, colloidal silica, slipping agents, organic fluoro compounds (especially fluorine surfactants), antistatic agents, ultraviolet absorbers,
High-boiling organic solvents, antioxidants, hydroquinone derivatives,
Examples include polymer latex, surfactants (including polymeric surfactants), hardeners (including polymeric hardeners), salt-containing grains, and non-photosensitive silver halide grains.

Regarding these additives, please refer to RD (Research Disclosure + -) Vol. 170. June 1978,
No. 17029 and Japanese Patent Application No. 60-276615.

〔Example〕

Hereinafter, specific 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 In this example, a core/shell type silver iodobromide emulsion, an organic silver salt dispersion, a dye-providing substance dispersion, and a reducing agent dispersion were prepared as follows, and these were used to heat the Samples Nα1 to No. 1 of photosensitive materials for development were prepared. Further, in this example, the present invention was applied to a transfer type heat-developable photosensitive material, so the preparation of the image receiving member will also be explained below.

(2) Preparation of core/shell type silver iodobromide emulsion A core/shell type emulsion Em-1 having a silver iodobromide content of 1 mol to 0.3 μm in average grain size was prepared by the following method.

At 40°C, JP-A No. 57-92523, No. 57
20 g of ossein gelatin, 0.2 mol of ammonia, and a silver iodobromide seed emulsion (average grain size 0.1 μm, silver iodide content 2 mol %) 0. Aqueous solution (A) in which 0385 mol was dissolved 10
00ate potassium diiodide 0.04 mol/2 and potassium bromide 1.94 mol/l aqueous solution B-1;
500 mj of solution C, which is an aqueous solution containing 1 mole of silver nitrate and 2 moles of ammonia! A core portion was prepared by simultaneously adding PAg at a maximum allowable rate without generating small particles while keeping PAg constant. At this stage, it was confirmed that each emulsion was monodispersed. After the addition of liquid B-1 was completed, liquid B-2 containing 1.98 mol/l of potassium bromide was added together with liquid C to form a shell. The pH during the addition was 9.0,
I) Ag was kept at 9.8.

The average grain size is 0.3 μm, the grain size distribution is 13%, the silver iodide content is 2 mol% in the core, 0 mol% in the shell, and 1 mol% on average for the whole, and the shell thickness is 0.031 μm. core/
An aqueous solution (containing 30 g of gelatin) was added to the shell-type silver halide emulsion Em-1, and after dispersion, 800 sff was added with distilled water.
Prepared to i.

■ Preparation of organic silver salt dispersion-1 28.8 g of 5-methylbenzotriazole obtained by reacting 5-methylbenzotriazole and silver nitrate in a water-alcohol mixed solvent and poly(N-vinylpyrrolidone) 16 .0g and 1.33g of 4-sulfobenzotriazole sodium salt were dispersed in an alumina ball mill, adjusted to pH 5.5, and adjusted to 200+yj! It was 4.

■Preparation of photosensitive silver halide dispersion The silver halide emulsion Em-1 prepared above was subjected to chemical sensitization and spectral sensitization using the following sensitizer to achieve red, green, and blue sensitivity. First, a silver halide emulsion dispersion was prepared.

(a) Preparation of red-sensitive silver iodobromide emulsion The above silver halide emulsion Em-1 was mixed with 200 d of sodium thiosulfate and 3.0 mg of chloroauric acid.
0.4 mg ammonium thiocyanate 10 ■ The following sensitizing dye (a) 1% methanol solution 12 ml 1 Sensitizing dye (a) (b) Preparation of green-sensitive silver iodobromide emulsion The above silver halide emulsion Em-1 was dissolved in 200 d thiosulfate. Sodium 4.0 ■Chloroauric acid
0.4 ■ Ammonium thiocyanate 10 ■ The following amplifying dye (b) 1% methanol solution 12 Relative (C) Preparation of blue-sensitive silver iodobromide emulsion 200d of the above silver halide emulsion Em-1 Sodium thiosulfate 3.0 ■Chloroauric acid
0.4 ■ Ammonium thiocyanate 10 ■ 1% methanol solution of the following aggravating dye (C) 12-related aggravating dye (
C) ■Preparation of dye-donor dispersion-1 The following dye-donor! (I) 83g, the following hydroquinone compound 5.0g and the following antifoggant were mixed in 200 g of ethyl acetate.
d, mixed with 720d of gelatin aqueous solution containing 1241d of 5% by weight aqueous solution of Alkanol After ethyl was distilled off, the pH was adjusted to 5.5 and the volume was made up to 195 ml.

Dye-donor substance (I) (yellow dye-donor substance) υ Hydroquinone compound 0■ Antifoggant ■Reducing agent Preparation of dispersion-1 23.3 g of the following reducing agent, 1.10 g of the following development accelerator,
Dissolve 14.6 g of poly(N-vinylpyrrolidone) and 0.50 g of the following fluorine-based surfactant in water and adjust the pH to 5.5.
There were 250 relatives.

CH2-CH=CI+□ Surfactant ■Preparation of heat-developable photosensitive material-1 A sample of the heat-developable photosensitive material was prepared as follows. That is, 12.5d of the organic silver salt dispersion-1 prepared above, the blue-sensitive silver halide emulsion (the emulsion Em-1)
10d1 gelatin color (2.0g), 39.8d of dye-donor dispersion-1, 12.5d of reducing agent dispersion-1, and the general formula (I) shown in Table-1. The compounds (the amounts added are shown in Table 1) were mixed, and then a hardener solvent [tetra(vinylsulfonylmethyl)methane and taurine were reacted at a ratio of 1:1 (ffil ratio), and 1% phenylcarbamoylated gelatin was added. Tetra(vinylsulfonylmethyl)methane is dissolved in an aqueous solution to give a concentration of 3% by weight. ] was added for 2.50 d, and 3.80 g of polyethylene glycol 300 (manufactured by Kanto Kagaku Co., Ltd.) was added as a hot solvent, and then the amount of silver was t, 76g
/rrr, and a protective layer made of a mixture of the phenylcarbamoylated gelatin and poly(N-vinylpyrrolidone) was further provided thereon to prepare a photothermographic material of sample Nα1 shown in Table 1. . In addition, samples (Samples Nos. 2 to 11) were prepared by adding the compounds of the present invention shown in Table 1 (the compounds and amounts are shown in Table 1) and the comparative compound (A) to the coating liquid of Sample 1. did.

Comparative compound (A) ■Preparation of image receiving member-1 Polyvinyl chloride (n=1.10
A tetrahydrofuran solution of Wako Pure Chemical Industries, Ltd. (Wako Pure Chemical Industries, Ltd.) was applied so that the amount of polyvinyl chloride was 12 g/nf.

The heat-developable photosensitive material was exposed to blue light through a step wedge, and then processed together with the image-receiving member in a heat developing machine (manufactured by Developer Module 277.3M).
After heat development was carried out at 50° C. for 1 minute, the photothermographic material and the image receiving member were immediately peeled off, and a magenta step wedge negative image was obtained on the polyvinyl chloride surface of the image receiving member.

Table -■ shows the maximum density of the magenta transfer image obtained by heat development.
Sensitivity and color density are shown as relative values. Sensitivity was determined using the fog +0.2 point, and the sensitivity of comparison sample N001 was set at 10.
It is expressed as a relative value with 0.

As understood from Table 1, sample No. 2 of the present invention
.

Samples 3.5.6 and 8.9 are superior in terms of maximum density, fog, and sensitivity, compared to comparative samples that do not use the compound represented by general formula (I). it is obvious.

Table-1 Example-2 The dye-providing substance dispersion was changed to the following dye-providing substance dispersion, and the silver halide emulsion was applied to a 180 μm thick photographic transparent polyester terephthalate film having an undercoat layer in Example-1. A photosensitive layer coating solution having the same composition as samples NIL 1 and Nα2 of Example-1 except that the red-sensitive silver iodobromide described in Example 1 was used was applied to a wet film thickness of 70 μm and dried to form a first photosensitive layer. .

<Dye-providing substance dispersion b> Dye-providing substance was mixed with the following dye-providing substance (3) (addition amount 90
g) The same dye-providing substance dispersion as in Example-1 except that it was changed to g).

Dye-providing substance (3) (cyan dye-providing substance) A first intermediate layer having the following composition was coated on the first photosensitive layer.

Gelatin 0.6g/nl Polyvinylpyrrolidone 0-3g/nf The following compounds
0.25 g/silver imethylbenztriazole 0.6 g/rip-butoxybenzamide 1.0 g/rrf2.4-dichloro-6-hydroxy-s-triazine sodium 20 g/boCH.

On the first intermediate layer, a photosensitive layer (second photosensitive layer) which is the same as the first photosensitive layer except that the dye dispersion in the first photosensitive layer was changed as shown below and the silver halide emulsion was changed to the above-mentioned green-sensitive silver halide emulsion. ) was formed.

This was obtained in the same manner as described above except that 35.5 g of the following dye-providing substance (2) was used in the dye-providing substance dispersion-1.

Dye-Providing Substance (2) (Magenta Dye-Providing Substance) H3 A second intermediate layer having the composition of the first intermediate layer with the following yellow filter dye (0.2 g/rrf) added was coated on the second photosensitive layer.

Yellow filter dye Further, on the second intermediate layer, a photosensitive layer coating solution having the same composition as Samples Nα1 and 2 of Example-1 was applied and dried to a wet film thickness of 80 μm to form a third photosensitive layer.

Furthermore, a protective layer having the following composition was coated on the third photosensitive layer to obtain multilayer photosensitive materials (samples Nα-12 and 13).

Gelatin 0.28 g/m Polyvinylpyrrolidone 0.14 g/rdSi
O□ 0.36 g/Bosafron 1.0 g/Bop-butoxybenzamide 0.42 g/rrr The obtained photosensitive material sample key k12.13 was exposed to red light, green light, and blue light of 800 CMS, respectively. Heat development was carried out in the same manner as in Example-1. The transfer density (D-, -, D-i-) and sensitivity of the obtained cyan, magenta and yellow dyes were measured. The results are shown in Table-2.

Table 2 Example 3 In this example, the following dye-providing substance dispersion liquid 2, photothermographic material 2, and image receiving member 3 were used.

<Dye-providing substance dispersion-2> 30.0 g of the following dye-providing substance (5) was mixed with 30.0 g of tricresyl phosphate. Gelatin aqueous solution 46 dissolved in Og and ethyl acetate 90.9d and containing surfactant, same as in Example-1
After mixing with 0ml and dispersing with an ultrasonic homogenizer, ethyl acetate was distilled off, and water was added to give 500ml! And so.

Dye-providing substance (5) <Thermal developable photosensitive material-2> Here, a sample of the heat developable photosensitive material was prepared as follows. That is, 40.0 ml of the blue-sensitive silver halide emulsion (the above emulsion Em-/ was used as the silver halide emulsion) and 25.0 ml of the organic silver salt dispersion-1. (I++1. Mix 50.0111i! of dye-providing substance dispersion-2, and further add 4.20 g of polyethylene glycol 300 (Kanto Kagaku) as a heat solvent.
, 1.5 d of 10% by weight methanol solution of 1-phenyl-4,4-dimethyl-3-birapriton, 3.00 ml of the same hardener as in Example 1, and 10% by weight of guanidine trichloroacetic acid in ice water-alcohol solution. 20.0 mf and a silver content of 2.50 g/r on an undercoated 180 μm thick photographic polyethylene terephthalate film.
It was applied so that it would be RF.

Preparation of Image Receiving Member-2> The following layers were sequentially applied onto a 100 μm thick transparent polyethylene terephthalate film.

(I) A layer made of polyacrylic acid. (7,00g/%
)(2) A layer consisting of cellulose acetate. (4,00g/
n()(3) A layer consisting of a 1:1 copolymer of styrene and N-benzyl-N,N-dimethyl-N-(3-maleimidopropyl)ammonium chloride and gelatin.

Copolymer 3.00 g/n (gelatin 3.00 g/bo(4) urea and polyvinyl alcohol (saponification degree 98%)
A layer consisting of.

4.0 g of urea/3.0 g of polyvinyl alcohol/polyvinyl alcohol The photothermographic material-2 was exposed to 1,600 CMS through a step wedge, and was heated at 150°C together with the image-receiving member-2 in a heat developing machine. After thermal development for one minute, the image receiving member was immediately peeled off.

The transmission density of the yellow transparent image obtained on the surface of the image-receiving element was measured using a densitometer (P-0-65, manufactured by Konishiroku Photo Industry ■),
The maximum density and minimum density (fog) are shown in Table 3 below. It also shows sensitivity.

Table 3 [Effects of the Invention] As described above, the heat-developable photosensitive material of the present invention has good developability, high sensitivity, and little fog during development.

Claims (1)

[Scope of Claims] 1. In a heat-developable photosensitive material containing a photosensitive silver halide, a reducing agent, and a binder, at least one layer of at least one compound represented by the following general formula (I) is used. 3.0 per mole of silver halide in the photographic constituent layer of
A heat-developable photosensitive material containing 1 mole or more of x10^-^. General Formula (I) ▲ Numerical formulas, chemical formulas, tables, etc. are available▼ In the formula, Z represents a collection of atoms necessary to form an aromatic ring or a heterocycle. The aromatic ring or heterocycle may have a substituent, and may form a fused ring.