JPH0682207B2 - Photothermographic material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a photothermographic material capable of forming a silver image or a dye image by dry treatment with heat, and particularly preferably by diffusion transfer of a dye. The present invention relates to a photothermographic material that forms a color image.

BACKGROUND OF THE INVENTION Photosensitive materials (heat-developable photosensitive materials) for obtaining a simple and quick image by carrying out a developing process by a dry process with heat are known. Publication Nos. 43-4921 and 43-4924, pages 553 to 555 of Fundamentals of Photographic Engineering (published by Corona Publishing Co. in 1979), and Research Disclosure June 1978 pages 9 to 15 (RD
-17029) etc.

In recent years, attempts have been made to develop a heat-developable color light-sensitive material capable of forming a color image using various dye-donor substances. Among these, the method of releasing or forming a diffusible dye by heat development and then transferring the dye to obtain a color image is advantageous in terms of stability and vividness of the image and easiness and speed of processing. It is excellent. This transfer type heat-developable color photosensitive material and image forming method are described, for example, in JP-A-59-12431 and 59-1.
59159, 59-181345, 59-229556, 60-2950
No. 61, No. 61-52643, No. 61-61158, No. 61-61157, No. 59
-180550, 61-132952, 61-139842, U.S. patents
4,595,652, 4,590,154 and 4,584,267.

In the above photothermographic material, a thermal solvent is often added to the photosensitive material for the purpose of activating thermal development.
Especially in the case of the diffusion transfer type heat-developable color photosensitive material,
Various thermal solvents or solvents have been added to the photosensitive layer and / or the non-photosensitive layer of the photothermographic material in order to enhance the diffusible dye formation efficiency and the dye transfer efficiency.

These hot solvents or solvents are described in, for example, JP-A-59-229556.
And JP-A-60-191251.

However, these hot solvents or solvents have one or more of the following drawbacks, and development of a hot solvent that does not have such drawbacks has been earnestly desired.

(1) Heat development (silver development efficiency, dye formation efficiency and transfer efficiency) is not sufficiently activated.

(2) The preservability of the raw sample of the photothermographic material, so-called raw preservability, deteriorates.

(3) The drying property of the photothermographic material is deteriorated. (The photosensitive material becomes sticky.) (4) The thermal solvent sublimes or vaporizes during storage or thermal development.

[Object of the Invention] An object of the present invention is to provide a photothermographic material in which all the above-mentioned drawbacks are improved.

That is, the first object of the present invention is to provide a photothermographic material which has good heat developability and which can obtain a high density and low fog image (that is, an image having a good S / N ratio) in a short time. .

The second object of the present invention is to provide a photothermographic material having a good raw storage property.

A third object of the present invention is to provide a photothermographic material in which the surface of the photosensitive material does not become sticky or the photosensitive materials do not stick to each other during manufacture, storage or use of the photosensitive material.

A fourth object of the present invention is to provide a thermal solvent which does not sublime or vaporize at a temperature of thermal development or below and a photothermographic material containing the thermal solvent.

[Structure of the Invention] The object of the present invention is to provide a photosensitive layer and / or a non-photosensitive compound having a photosensitive silver halide, a reducing agent and a binder on a support and having a compound represented by the following general formula (1). Achieved by the photothermographic material contained in the layer.

General formula (1) In the formula, n represents 1 or 2, and when n = 1, R has 3 carbon atoms.
Represents an alkyl group, an alkenyl group, an alkoxy group, or an alkenyloxy group having 8 to 8 carbon atoms, and when n = 2, R has 2 to 5 carbon atoms.
4 represents an alkyl group, an alkoxy group or an alkenyloxy group having 3 to 4 carbon atoms.

[Specific Structure of the Invention] The photothermographic material of the invention comprises a photosensitive element having a photosensitive layer and a non-photosensitive layer (for example, an intermediate layer, an undercoat layer, a protective layer) on a support. Further, when the photothermographic material is a photothermographic material which forms an image by transferring a diffusible image forming compound (for example, a dye), an image receiving element is required. Hereinafter, in the present invention, only the light-sensitive element will be narrowly interpreted as a photothermographic material, and the image-receiving element as an image-receiving member.

The compound represented by the general formula (1) of the present invention is preferably contained in the light-sensitive material (particularly the light-sensitive layer), but may be further contained in the image-receiving member, and when it is contained in the image-receiving member, it is also included in the present invention. Included.

The photosensitive layer of the present invention comprises a photosensitive silver halide, a reducing agent, a binder and a compound represented by the above general formula (1) of the present invention. In a preferred embodiment, a dye-providing substance (particularly a diffusible dye) is used. A dye-providing substance that releases or forms a dye is preferable, and the dye-donating substance may also serve as a reducing agent) and an organic silver salt.

The compound represented by formula (1) will be described.

General formula (1) In the formula, n represents 1 or 2, and when n = 1, R has 3 to 10 carbon atoms.
8, more preferably 4 to 6 alkyl groups (for example, i-propyl group, n-butyl group, t-butyl group, n-amyl group, i-amyl group, n-hexyl group, n-octyl group,
t-octyl group), alkenyl group (eg allyl group, crotyl group, i-crotyl group), alkoxy group (eg n
-Butoxy group, n-amyloxy group, i-amyloxy group, n-hexyloxy group) or alkenyloxy group (for example, allyloxy group, crotyloxy group, i-crotyloxy group), and when n = 2, R is the number of carbon atoms. Two
4 alkyl groups (eg ethyl, propyl, t-
A butyl group), an alkoxy group (eg ethoxy group, n-propoxy group, n-butoxy group) or an alkenyloxy group having 3 to 4 carbon atoms (eg allyloxy group, crotyloxy group, i-crotyloxy group). Further, when n = 2, two Rs may be the same group or different groups.

Specific examples of the compound represented by the general formula (1) of the present invention include the following.

p-i-propylbenzamide, pn-butylbenzamide, pt-butylbenzamide, pn-amylbenzamide, pn-hexylbenzamide, pn
-Octylbenzamide, p-allylbenzamide, p
-N-butoxybenzamide, o-n-butoxybenzamide, m-n-butoxybenzamide, o-n-amyloxybenzamide, P-n-amyloxybenzamide, p-i-amyloxybenzamide, p-allyloxybenzamide, p-crotyloxybenzamide, o-i-crotyloxybenzamide, 3,5-diethylbenzamide, 3-ethyl-5-ethoxybenzamide, 2,4-diethoxybenzamide, 2,4-dipropoxybenzamide, 3, 5-dipropoxybenzamide, 2,6
-Dipropoxybenzamide, 3,4-dibutoxybenzamide, 2,4-diallyloxybenzamide, 2,4-dicrotyloxybenzamide, 2,4-di-i-crotyloxybenzamide.

Is the compound represented by the above general formula of the present invention synthesized from R-substituted benzoic acid, R-substituted benzoic acid ester, R-substituted cyanobenzene, etc.・ SYNTHETIC ORGANI by RBWAGNER, HDZOOK
C CHEMISTRY) described on pages 565 to 589) or hydroxybenzamide or dihydroxybenzamide with an alkyl halide or an alkenyl halide.

The photothermographic material of the present invention basically comprises (1) a photosensitive silver halide, (2) a reducing agent, (3) a dye-providing substance, and (4) a binder in one photothermographic layer. Contains,
Further, it is preferable to contain (5) an organic silver salt, if necessary. However, these do not necessarily have to be contained in a single photographic constituent layer.
The layers (1), (2), (4), and (5) are contained in the heat-developable photosensitive layer on one side, and the dye-donor substance is added to the layer on the other side adjacent to the photosensitive layer. As long as they can react with each other, such as containing (3), they may be contained separately in two or more constituent layers.

Further, the heat-developable photosensitive layer may be divided into two or more types such as a high-sensitivity layer and a low-sensitivity layer, a high-density layer and a low-density layer, and the like.

The photothermographic material of the invention has one or more photothermographic layers on a support. In the case of color, it generally has three heat-developable photosensitive layers having different color sensitivities, and in each photosensitive layer, dyes having different hues are formed or released by heat development. Usually, a yellow dye is combined with the blue photosensitive layer, a magenta dye is combined with the green photosensitive layer, and a cyan dye is combined with the red photosensitive layer, but the combination is not limited thereto. It is also possible to combine a near-infrared photosensitive layer.

The structure of each layer can be arbitrarily selected according to the purpose.For example, a structure in which a red photosensitive layer, a green photosensitive layer, and a blue photosensitive layer are sequentially formed on a support, and conversely, a blue photosensitive layer is sequentially formed on a support. Layer, green photosensitive layer, red photosensitive layer, or on the support,
There are configurations such as a green photosensitive layer, a red photosensitive layer, and a blue photosensitive layer.

The photothermographic material of the invention may be provided with a non-photosensitive layer such as an undercoat layer, an intermediate layer, a protective layer, a filter layer, a backing layer and a release layer in addition to the photothermographic layer.
For coating the heat-developable photosensitive layer and these non-photosensitive layers on a support, the same methods as those used for coating and preparing a general silver halide photosensitive material can be applied.

When the photothermographic material of the invention is of the color type, a dye-donor substance is used.

Examples of the dye-donor substance of the present invention include Japanese Patent Application No. 60-18518.
No. 6, Japanese Patent Application No. 60-271117, Japanese Patent Application No. 61-11563, dye-providing dye-forming substances which form a non-diffusible dye may be used, but preferably a diffusible dye forming or system is used. A compound that is a dye-providing substance, and is particularly preferably a compound that forms a diffusible dye by a coupling reaction.

Hereinafter, the dye-providing substance that can be used in the present invention will be described. The dye-donating substance may be any one as long as it can participate in the reduction reaction of the photosensitive silver halide and / or the organic silver salt optionally used and can form or release a diffusible dye as a function of the reaction, Depending on the reaction form, a negative-working dye-donor that acts on a positive function (that is, it forms a negative dye image when using a negative-working silver halide) and a positive-working that works on a negative function. Dye-donor substances (ie, a positive dye image is formed when a negative-working silver halide is used). Negative type dye-donor substances are further classified as follows.

Each dye-donor will be further described. Examples of the reducing dye releasing compound include compounds represented by the general formula (2).

General formula (2) Car-NHSO ₂ -Dye In the formula, Car is a reducing substrate (so-called carrier) that is oxidized to release a dye upon reduction of the photosensitive silver halide and / or the organic silver salt used as necessary. ), And Dye is a diffusible dye residue.

Specific examples of the above reducing dye-releasing compound include those disclosed in JP-A-
57-179840, 58-116537, 59-60434, 59-658
39, 59-71046, 59-87450, 59-88730, 59
59-123837, 59-165054, 59-165055 and the like.

As another reducing dye-releasing compound, for example, general formula (3)
The compound shown by is mentioned.

General formula (3) In the formula, A ₁ and A ₂ each represent a hydrogen atom, a hydroxy group or an amino group, and Dye has the same meaning as Dye represented by the general formula (2). Specific examples of the above compounds are shown in JP-A-59-124329.

As the coupling dye-releasing compound, a compound represented by the general formula (4)
The compound shown by is mentioned.

General formula (4) Cp ₁ JDye In the formula, Cp ₁ is an organic group capable of reacting with an oxidant of a reducing agent to release a diffusible dye (so-called coupler residue).
And J is a divalent linking group, and the bond between Cp ₁ and J is cleaved by the reaction with the oxidized form of the reducing agent. n ₁ is 0 or 1
And Dye has the same meaning as defined by the general formula (2). Further, Cp ₁ is preferably substituted with various ballast groups in order to make the coupling dye-releasing compound non-diffusible. The ballast group has 8 or more carbon atoms depending on the form of the photosensitive material used. (More preferably 12
Or more) organic groups, or hydrophilic groups such as sulfo groups and carboxy groups, or groups having both 8 or more (more preferably 12 or more) carbon atoms and hydrophilic groups such as sulfo groups and carboxy groups. is there. Another particularly preferred ballast group may include a polymer chain.

Specific examples of the compound represented by the above general formula (4) include JP-A Nos. 57-186744, 57-122596, and 57-160698.
Issue 59-174834, Issue 57-224883, Issue 59-159159,
No. 59-231540, which is described in each specification.

Examples of the coupling dye-forming compound include those represented by the general formula (5)
The compound shown by is mentioned.

Formula (5) Cp ₂ FB In the formula, Cp ₂ is an organic group (so-called coupler residue) capable of reacting with an oxidizing product of a reducing agent (coupling reaction) to form a diffusible dye, and Fp Represents a divalent linking group, and B represents a ballast group.

The coupler residue represented by Cp ₂ has a molecular weight of preferably 700 or less, more preferably 500 or less because of the diffusibility of the dye formed.

Further, the ballast group is preferably the same ballast group as the ballast group defined by the general formula (4), particularly 8 or more (more preferably 12 or more) carbon atoms and a hydrophilic group such as a sulfo group or a carboxy group. A group having both groups is preferable, and a polymer chain is more preferable.

As the coupling dye-forming compound having the polymer chain, a polymer having a repeating unit derived from the monomer represented by the general formula (6) is preferable.

General formula (6) Cp ₂ FY _l ZL In the formula, Cp ₂ and F have the same meanings as defined in general formula (5), Y represents an alkylene group, an arylene group or an aralkylene group, and 1 represents 0 or 1 represents, Z represents a divalent organic group, and L represents an ethylenically unsaturated group or a group having an ethylenically unsaturated group.

Specific examples of the coupling dye-forming compounds represented by the general formulas (5) and (6) include JP-A-59-124339,
59-181345, 60-2950, Japanese Patent Application No. 59-179657, 5
No. 9-181604, No. 59-182506, No. 59-182507, and the like, and examples thereof include the following compounds.

Exemplified dye donor polymer In the above general formulas (4), (5) and (6), Cp ₁
Further, the coupler residue defined by Cp ₂ will be described in more detail, and a group represented by the following general formula is preferred.

In the formula, R ⁷ , R ⁸ , R ⁹ and R ¹⁰ are each a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aryl group,
Acyl group, alkyloxycarbonyl group, aryloxycarbonyl group, alkylsulfonyl group, arylsulfonyl group, carbamoyl group, sulfamoyl group, acyloxy group, amino group, alkoxy group, aryloxy group, cyano group, alkylsulfonyl group, arylsulfonyl group Represents a ureido group, an alkylthio group, an arylthio group, a carboxy group, a sulfo group or a heterocyclic residue,
These are further substituted with hydroxyl group, carboxy group, sulfo group, alkoxy group, cyano group, nitro group, alkyl group, aryl group, aryloxy group, acyloxy group, acyl group, sulfamoyl group, carbamoyl group, imide group, halogen atom, etc. It may have been done.

These substituents are selected according to the purpose of Cp ₁ and Cp ₂ ,
As described above, in Cp ₁ , _one of the substituents is preferably a ballast group, and in Cp ₂ , it is substituted so that the molecular weight is 700 or less, more preferably 500 or less in order to enhance the diffusibility of the dye formed. It is preferred that a group is selected.

As the positive type dye-donating substance, for example, the following general formula (1
There are oxidizing dye-releasing compounds represented by 7).

General formula (17) In the formula, W ₁ represents a group of atoms necessary for forming a quinone ring (which may have a substituent on this ring), and R 1
¹¹ represents an alkyl group or a hydrogen atom, and E is (In the formula, R ¹² represents an alkyl group or a hydrogen atom, and R ¹³ represents an oxygen atom or Represents ) Or —SO ₂ —, r represents 0 or 1, and Dye has the same meaning as defined in formula (2). Specific examples of this compound are disclosed in JP-A Nos. 59-166954 and 59-15.
It is described in the specification such as 4445.

Another positive dye-donor substance is a compound represented by the following general formula (18), which loses its dye releasing ability when oxidized.

General formula (18) In the formula, W ₂ represents a group of atoms necessary for forming a benzene ring (which may have a substituent on the ring),
R ¹¹ , r, E and Dye have the same meaning as defined in the general formula (17). A specific example of this compound is JP-A-59-124327.
No. 59-152440 and the like.

Still another positive type dye-donor substance includes compounds represented by the following general formula (19).

General formula (19) In the above formula, W ₂ , R ¹¹ and Dye have the same meaning as defined in the general formula (18). The specifics of this compound are described in JP-A-59-154445.

The residue of the diffusible dye represented by Dye in the above general formulas (2), (3), (4), (17), (18) and (19) will be described in more detail. The residue of the diffusible dye has a molecular weight of 800 or less, more preferably 600 because of the diffusibility of the dye.
The following are preferred, and examples thereof include residues of azo dyes, azomethine dyes, anthraquinone dyes, naphthoquinone dyes, styryl dyes, nitro dyes, quinoline dyes, carbonyl dyes, phthalocyanine dyes and the like. These dye residues may be in the form of a temporary short-wave that allows multiple colors during heat development or transfer. Further, these dye residues are used for the purpose of improving the light resistance of an image, for example, JP-A-59-48765 and 59-1.
The chelatable dye residue described in 24337 is also a preferred form.

These dye-donor substances may be used alone or in combination of two or more. The amount used is not limited, depending on the type of the dye-donating substance, a single use or a combination use of two or more kinds, or whether the photographic constituent layer of the light-sensitive material of the present invention is a single layer or two or more kinds of multilayers. It may be determined depending on the case, but for example, the amount used may be 0.005 g to 50 g, preferably 0.1 g to 10 g per 1 m ² .

The method for incorporating the dye-donor substance used in the present invention into the photographic constituent layer of the photothermographic material is arbitrary and includes, for example, a low-boiling point solvent (methanol, ethanol, ethyl acetate, etc.) or a high-boiling point solvent (dibutyl phthalate, dioctyl phthalate, tritium). Cresyl phosphate, etc.) and then ultrasonically dispersed or dissolved in an alkaline aqueous solution (eg, 10% sodium hydroxide solution), and then neutralized with a mineral acid (eg, hydrochloric acid or nitric acid). It can be used after being used or after being dispersed with a suitable polymer aqueous solution (eg, gelatin, polyvinyl butyral, polyvinyl pyrrolidone, etc.) using a ball mill.

The photosensitive silver halide used in the present invention includes silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodide, silver iodobromide,
Examples thereof include silver chloroiodobromide. The photosensitive silver halide is
It can be prepared by any method such as a single jet method and a double jet method in the field of photographic technology. According to a further preferred embodiment, a silver halide emulsion having silver halide grains having a shell can be used.

In addition, for example, JP-A-58-111933, JP-A-58-111934 and JP-A-58-111934.
-108526, Research Disclosure 22534, etc., having two parallel crystal faces,
And, each of these crystal faces is a grain having a larger area than the other single crystal of this grain, and its aspect ratio, that is, the ratio of the diameter of the grain to the thickness of the tabular silver halide grain of 5: 1 or more, It is also possible to use a silver halide emulsion consisting of

Further, in the present invention, a silver halide emulsion containing an internal latent image type silver halide grain whose surface is not previously fogged can be used. For internal latent image type silver halide in which the surface is not previously fogged, for example, U.S. Pat.
592,250, 3,206,313, 3,317,322, 3,511,6
No. 62, No. 3,447,927, No. 3,761,266, No. 3,703,584
No. 3,736,140, etc., the silver halide has a higher sensitivity inside the grain than at the surface of the grain. Also, U.S. Patent No. 3,271,157,
No. 3,447,927 and No. 3,531,291, a silver halide emulsion having silver halide grains containing a polyvalent metal ion, or a dopant described in U.S. Pat. A silver halide emulsion in which the grain surfaces of silver halide grains are weakly chemically sensitized, or a silver halide emulsion comprising grains having a laminated structure described in JP-A Nos. 50-8524 and 50-38525,
Other examples include silver halide emulsions described in JP-A-52-156614 and JP-A-55-127549.

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

The silver halide in the above light-sensitive emulsion may be coarse particles or fine particles, but the preferable grain size is about 0.001 μm to about 1.5 μm, and more preferably about 0.01 μm to about 0.01 μm. It is about 0.5 μm.

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

These photosensitive silver halide and photosensitive silver salt-forming component can be used in combination in various methods, and the amount used is
The amount is preferably 0.001 g to 50 g, and more preferably 0.1 g to 10 g per 1 m ^{2 of the} support.

Typical spectral sensitizing dyes used in the present invention include, for example, cyanine, merocyanine, complex (trinuclear or tetranuclear) cyanine, holopolar-cyanine, styryl, hemicyanine and oxonol.

The addition amount of these sensitizing dyes is 1 × 10 ⁻⁴ to 1 mol per mol of the photosensitive silver halide or the silver halide-forming component. More preferably, it is 1 × 10 ^-4 mol to 1 × 10 ^-1 mol.

In the photothermographic 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 the organic silver salt used in the photothermographic material of the present invention include JP-B-43-4921, JP-A-49-52626, and JP-A-52-141222.
No. 53-36224, No. 53-37610, etc., and U.S. Pat.Nos. 3,330,633, 3,794,496, and 4,10
Silver salts of long-chain aliphatic carboxylic acids and silver salts of carboxylic acids having a heterocycle such as those described in each specification such as 5,451, such as silver laurate, silver myristate, silver palmitate, and stearin. Aromatic carboxylic acid silver, such as silver acid salt, silver arachidonic acid, silver behenate, α- (1-phenyltetrazolethio) acetic acid silver, for example, silver benzoate, silver phthalate, etc. 12700, 45-18416
No. 45-22185, JP-A-52-137321, JP-A-58-1186
No. 38, No. 58-118639, U.S. Pat. No. 4,123,274 and the like, there are silver salts of imino groups.

In addition, a silver complex compound having a stability constant of 4.5-10.0 as described in JP-A-52-31728, a silver salt of imidazoline thione as described in U.S. Pat. No. 4,168,980, and the like are used.

Among the above organic silver salts, silver salts of imino groups are preferable,
Particularly, a silver salt of a benzotriazole derivative, more preferably 5-methylbenzotriazole and its derivative, sulfobenzotriazole and its derivative, N-alkylsulfamoylbenzotriazole and its derivative are preferable.

The organic silver salt used in the present invention may be used alone or in combination of two or more kinds. The silver salt may be prepared in a suitable binder and used as it is without isolation, or the isolated product may be dispersed in the binder by a suitable means before use. Examples of the dispersing method include, but are not limited to, a ball mill, a sand mill, a colloid mill and a vibration mill.

Further, the method for preparing the organic silver salt is generally a method in which silver nitrate and a raw material organic compound are dissolved and mixed in water or an organic solvent, but a binder may be added if necessary, or sodium hydroxide or the like may be added. It is also effective to add an alkali to accelerate the dissolution of the organic compound or to use an ammoniacal silver nitrate solution.

The amount of the organic silver salt used is usually preferably 0.01 to 500 mol, and more preferably 0.1 to 1 mol, per 1 mol of the photosensitive silver halide.
~ 100 mol. More preferably, it is 0.3 to 30 mol.

As the reducing agent used in the photothermographic material of the present invention, those commonly used in the field of photothermographic materials can be used.

Dye-donor substances used in the photothermographic material of the present invention, for example, JP-A-57-186744, 58-79247,
58-149046, 58-149047, 59-124339, 59-
No. 181345, No. 60-2950 and the like, by coupling with an oxidant of a reducing agent as disclosed in, a dye-donating substance that releases or forms a diffusible dye,
Examples of the reducing agent used in the present invention include US Pat.
No. 3,531,286, No. 3,761,270, No. 3,764,328, or RD No. 12146, No. 15108, No. 15127
And the p-phenylenediamine-based and p-aminophenol-based developing agents, phosphoroamidophenol-based, sulfonamidephenol-based developing agents, sulfonamideaniline-based developing agents, and hydrazone-based color development described in JP-A-56-27132. A developing agent or the like can be used. Also, U.S. Pat.Nos. 3,342,599 and 3,719,492, JP
The color developing agent precursors described in JP-A-53-135628 and JP-A-57-79035 can also be advantageously used.

Particularly preferred reducing agents are N- (PN, N-dialkyl) s described in JP-A-56-146133 and Japanese Patent Application No. 61-71683.
Examples include phenylsulfamate.

Two or more reducing agents may be used at the same time. It is also possible to use a black-and-white developing agent together for the purpose of improving the developability.

Further, the dye-donor substances used in the present invention include JP-A-57-179840, JP-A-58-58543, JP-A-59-152440, and JP-A-59-1.
In the case of compounds that release dyes by oxidation as shown in 54445, compounds that lose dye releasing ability by oxidation, compounds that release dyes by reduction (or simply obtain only silver image) In the case), a developing agent as described below can also be used.

For example, phenols, sulfonamide phenols,
Or polyhydroxybenzenes, naphthols, hydroxybinaphthyls and methylenebisnaphthols,
Methylene bisphenols, ascorbic acids, 3-pyrazolidones, pyrazolones, hydrazones and paraphenylenediamines.

These developing agents may be used alone or in combination of two or more.

The amount of the reducing agent used in the photothermographic material of the invention depends on the type of the photosensitive silver halide used, the type of the organic acid silver salt, the type of other additives, etc. Is 0.01 to 15 per mol of photosensitive silver halide.
The amount is in the range of 00 mol, preferably 0.1 to 200 mol.

Examples of the binder used in the photothermographic material of the present invention include polyvinyl butyral, polyvinyl acetate, ethyl cellulose, polymethyl methacrylate, cellulose acetate butyrate, polyvinyl alcohol, polyvinyl pyrrolidone, gelatin, gelatin derivatives such as phthalated gelatin, and cellulose derivatives. , Protein, starch,
One or more synthetic or natural polymeric substances such as natural substances such as polysaccharides such as gum arabic can be used in combination. In particular, it is preferable to use gelatin or a derivative thereof in combination with a hydrophilic polymer such as polyvinylpyrrolidone or polyvinyl alcohol, more preferably JP-A
It is a mixed binder of gelatin described in 59-229556 and polyvinylpyrrolidone (including a copolymer of vinylpyrrolidone and another monomer).

The amount of the binder used is usually 0.05 g to ⁵ per 1 m ^{2 of the} support.
It is 0 g, preferably 0.1 g to 10 g.

Further, the binder is 0.1 to 10 g per 1 g of the dye-donor substance.
It is preferably used, and more preferably 0.25 to 4 g.

The support used in the photothermographic material of the present invention includes
For example, polyethylene film, cellulose acetate film and polyethylene terephthalate film, synthetic plastic film such as polyvinyl chloride, photographic base paper, printing paper, paper for baryta paper and resin-coated paper, and electronic materials on these supports. Examples thereof include a support coated with and cured by a linear curable resin composition.

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

What is known as a toning agent in the photothermographic material may be added to the photothermographic material of the invention as a development accelerator. As the color tone agent, for example, JP-A-46-4928,
46-6077, 49-5019, 49-5020, 49-91215
No. 49, No. 107727, No. 50-2524, No. 50-67132, No. 50
-67641, 50-114217, 52-33722, 52-99813
No. 53, No. 53-1020, No. 53-55115, No. 53-76020, No. 53-
125014, 54-156523, 54-156524, 54-15652
No. 5, No. 54-156526, No. 55-4060, No. 55-4061, No. 55
-32015, etc. and West German Patents 2,140,406, 2,141,063, 2,220,618, and U.S. Patent 3,847,612
No. 3,782,941, No. 4,201,582 and JP-A-57
-207244, 57-207245, 58-189628, 58-1935
The compounds are described in each specification such as No. 41.

Other development accelerators include JP-A-59-177550 and 59-11.
The compounds described in 1636 are mentioned. Japanese Patent Application Sho 59-280
Development accelerator releasing compounds described in 881 can also be used.

Examples of the antifoggant include higher aliphatic compounds described in U.S. Pat. No. 3,645,739, second mercury salts described in Japanese Patent Publication No. 47-11113, N-halogen compounds described in JP-A No. 51-47419, U.S. Pat.No. 3,700,457, mercapto compound-releasing compounds described in JP-A-51-50725, arylsulfonic acids described in 49-125016, lithium carboxylic acid salts described in 51-47419, British Patent No. 1,455,271, JP 5
Oxidizing agents described in 0-101,019, sulfinic acids or thiosulfonic acids described in 53-19825, 2-thiouracils described in 51-3223, sulfur simple substance described in 51-26019, 51 -42529, 51-81124, 55-93149, disulfide and polysulfide compounds,
Rosin or diterpenes described in 51-57435, 51
-Polymer acid having a free carboxyl group or sulfonic acid group described in No. 104338, thiazoline thione described in U.S. Patent No. 4,138,265, JP-A-54-51821, U.S. Patent No. 4,137,079 1,2 , 4-triazole or 5
-Mercapto-1,2,4-triazole, JP-A-55-140833
Thiosulfinic acid esters described in No. 55-142331
1,2,3,4-thiatriazoles described in No. 59-46641
No. 59-57233, No. 59-57234 dihalogen compound or trihalogen compound, further 59-111636
Thiol compounds described in JP-A No. 60-198540, hydroquinone derivatives described in JP-A No. 60-198540, and combined use of a hydroquinone derivative described in JP-A No. 60-227255 with a benzotriazole derivative.

As another particularly preferable antifoggant, Japanese Patent Application No.
Inhibitor having a hydrophilic group described in 60-218169, polymer inhibitor described in Japanese Patent Application No. 60-262177, and inhibitor compound having a ballast group described in Japanese Patent Application No. 60-263564. Is mentioned.

In addition, an inorganic or organic base or base precursor can be added. Examples of the base precursor include a compound which releases a basic substance by decarboxylation upon heating (eg, guanidinium trichloroacetate), a compound which decomposes by a reaction such as an intramolecular nucleophilic substitution reaction to release an amine, and the like. JP-A-56-130745, 56-
132332, British Patent 2,079,480, U.S. Patent No. 4,060,420
No. 59-157637, 59-166943, 59-180537
No. 59-174830, No. 59-195237 and the like.

In addition, various additives used in the photothermographic material as required, for example, antihalation dyes, fluorescent whitening agents, hardeners, antistatic agents, plasticizers, spreading agents, matting agents,
Surfactants, anti-fading agents, etc. are specifically mentioned, specifically, Research Disclosure Vol.170, June 1978 No.17.
No. 029 and Japanese Patent Application No. 60-276615.

The photothermographic material of the invention is preferably provided with a protective layer.

Various additives used in the field of photography can be used in the protective layer. Examples of the additive include various matting agents, colloidal silica, sliding agents, organic fluoro compounds (particularly fluorine-based surfactants), antistatic agents, ultraviolet absorbers, high boiling organic solvents, antioxidants, hydroquinone derivatives, polymers. Examples thereof include latex, surfactants (including polymer surfactants), hardeners (including polymer hardeners), organic silver salt particles, non-photosensitive silver halide particles, and the like.

These additives are described in Research Disclosure Vol.170, June 1978 No.17029, Japanese Patent Application No. 60-2766.
It is described in JP-A-15.

The image receiving layer of the image receiving member effectively used in the present invention,
It suffices that it has a function of receiving the dye in the photothermographic layer which is released or formed by the heat development, and is, for example, a polymer containing a tertiary amine or a quaternary ammonium salt, and is described in US Pat.
Those described in No. 709,690 are preferably used. A typical image-receiving layer for diffusion transfer can be obtained by mixing a polymer containing an ammonium salt, a tertiary amine or the like with gelatin, polyvinyl alcohol or the like and coating the mixture on a support. Another useful dye receiving material is JP-A
Examples thereof include those formed of a heat-resistant organic polymer substance having a glass transition temperature of 40 ° C. or higher and 250 ° C. or lower described in JP-A No. 57-207250.

These polymers may be carried on a support as an image receiving layer, or may be used as a support itself.

Examples of the heat-resistant organic polymer substance include polystyrene, polystyrene derivatives having a substituent having 4 or less carbon atoms, polyvinylcyclohexane, polydivinylbenzene, polyvinylpyrrolidone, polyvinylcarbazole,
Polyacetals such as polyallylbenzene, polyvinyl alcohol, polyvinyl formal and polyvinyl butyral, polyvinyl chloride, chlorinated polyethylene, polytrifluoroethylene, polyacrylonitrile, poly-N, N-dimethylallylamide, p-cyanophenyl group , Polyacrylate having pentachlorophenyl group and 2,4-dichlorophenyl group, polyacrylchloroacrylate, polymethylmethacrylate, polyethylmethacrylate, polypropylmethacrylate, polyisopropylmethacrylate, polyisobutylmethacrylate, poly-tert-butylmethacrylate, polycyclohexyl Methacrylate, polyethylene glycol dimethacrylate, poly-2-cyano-ethyl methacrylate, polyethylene terephthale Examples thereof include polyesters such as polyester, polysulfone, polycarbonates such as bisphenol A polycarbonate, polyanhydrides, polyamides, and cellulose acetates. Also, Polymer Handbook Second Edition (edited by Jay Brand Wrap, EH Inmargat) John Willy and Sons {Polymer Handbook 2
nd ed. (J, Brandrup, EHImmergut) John Wiley & Son
s} Synthetic polymers having a glass transition temperature of 40 ° C. or lower described in the publication are also useful. Generally, 2,000 to 200,000 is useful as the molecular weight of the polymer substance. These polymeric substances may be used alone or as a mixture of two or more kinds, or may be used as a copolymer by combining two or more kinds.

Examples of useful polymers include cellulose acetate such as triacetate and diacetate, heptamethylenediamine and terephthalic acid, fluorenedipropylpropylamine and adipic acid, hexamethylenediamine and diphenic acid, polyamide by a combination of hexamethylenediamine and isophthalic acid, and diethylene glycol. And polyester, polyethylene terephthalate, and polycarbonate prepared by combining diphenyl carboxylic acid, bis-p-carboxyphenoxybutane and ethylene glycol, and the like. These polymers may be modified. For example, polyethylene terephthalate using cyclohexanedimethanol, isophthalic acid, methoxypolyethylene glycol, 1,2-dicarbomethoxy-4-benzenesulfonic acid or the like as a modifier is also effective.

Particularly preferred image-receiving layers include the layer made of polyvinyl chloride described in JP-A-59-223425 and the layer made of polycarbonate and a plasticizer described in JP-A-60-19138.

These polymers can be used as an image receiving layer (image receiving member) which also serves as a support. At that time, the support may be formed of a single layer or a plurality of layers. Good.

As the support for the image-receiving member, any support such as a transparent support or an opaque support may be used. For example, a film of polyethylene terephthalate, polycarbonate, polystyrene, polyvinyl chloride, polyethylene, polypropylene or the like and the support thereof may be used. Supports containing pigments such as titanium oxide, barium sulfate, calcium carbonate, talc, baryta paper, RC paper laminated with a thermoplastic resin containing pigment on paper, cloth, glass, aluminum, etc. Metals, etc., or a support obtained by coating and curing an electron beam curable resin composition containing a pigment on these supports, and a support provided with a coating layer containing a pigment on these supports. Etc.

In particular, a support obtained by coating and curing an electron beam curable resin composition containing a pigment on paper, or directly or on the paper has a pigment coating layer, and the electron beam curable resin on the pigment coating layer. The support coated with the composition and cured can be used as it is as an image receiving member because the resin layer can be used as an image receiving layer by itself.

When the present invention is applied to a heat-developable color light-sensitive material, various polymers described above can be used as an image-receiving layer as a mordant for a dye image, and the image-receiving layer is a separate layer containing the image-receiving layer on a suitable support. It may be an image receiving element or the image receiving layer may be a single layer which is part of a heat developable color photographic material. If desired, an opaque layer (reflective layer) can be included in the light-sensitive material, which layer reflects the desired degree of radiation, such as visible light, that can be used to observe the dye image in the image-receiving layer. It is used to The opacifying layer (reflecting layer) can contain various reagents which provide the necessary reflection, for example titanium dioxide.

The image-receiving layer of the image-receiving member can be formed in a mold which is peeled off from the photothermographic layer. For example, after imagewise exposure of a heat-developable color light-sensitive material, an image-receiving layer may be superposed on the heat-developable light-sensitive layer and uniformly heated and developed. It is also possible to transfer the dye image released or formed from the dye-donor substance by superimposing image-receiving layers after imagewise exposure of the heat-developable color light-sensitive material and uniform heat development, and heating at a temperature lower than the development temperature.

The photothermographic material of the present invention usually has a temperature of 80 to 200 after imagewise exposure.
℃, preferably in the temperature range of 100 ℃ ~ 170 ℃ 1 second ~ 18
It is developed only by heating at 0 ° C., preferably for 1.5 seconds to 120 seconds. The transfer of the diffusible dye to the image-receiving layer may be carried out simultaneously with the 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 the heat-development. Alternatively, transfer may be performed by supplying water and then closely contacting the same with water and heating if necessary. Moreover, you may perform a pre-heating in the temperature range of 70 degreeC-180 degreeC before exposure. Also, JP-A-60-143338 and Japanese Patent Application No. 60-36
As described in No. 44, the photosensitive material and the image receiving member are heated to 80 ° C. to 250 ° C. immediately before heat development transfer in order to enhance mutual adhesion.
Each may be preheated at a temperature of ° C.

Various exposing means can be used for the photothermographic material according to the present invention.

As the heating means, all methods applicable to ordinary photothermographic materials can be used, for example, contact with a heated block or plate, contact with a heat roller or a heat drum, or passage through a high temperature atmosphere. Alternatively, high-frequency heating is used, or further, a conductive layer containing a conductive substance such as carbon black is provided on the back surface of the photosensitive material of the present invention or the back surface of the image transfer member for thermal transfer, and Joule heat generated by energization is used. You can also The heating pattern is not particularly limited, and it includes a method of preheating (preheating) in advance and then heating again, rising at a high temperature for a short time or at a low temperature for a long time, continuously rising, descending or repeating, and further discontinuous. It can be heated,
A simple pattern is preferred. Further, it may be a system in which exposure and heating proceed simultaneously.

[Examples] Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to these embodiments.

Example-1 <Preparation of silver iodobromide emulsion> At 50 ° C., 20 g of ossein gelatin using a mixing stirrer described in JP-A-57-92523 and 57-92524.
1000 ml of distilled water and 500 ml of an aqueous solution containing 11.6 g of potassium iodide and 131 g of potassium bromide in a (A) liquid dissolved in (B) and 500 ml of an aqueous solution containing 1 mol of silver nitrate and ammonia. Solution (C) was added at the same time while keeping the pAg constant. The shape and size of the emulsion grains to be prepared were adjusted by controlling the pH, pAg, and the addition rates of solutions B and C. Thus, a core emulsion having a silver iodide content of 7 mol%, a regular octahedron and an average grain size of 0.25 μm was prepared. Then, in the same manner as the above method, a shell of silver halide having a silver iodide content of 1 mol% is coated to give a regular octahedral average grain size.
A 0.3 μm core / shell type silver halide emulsion was prepared (monodispersity was 9%). The emulsion thus prepared was washed with water and desalted. The emulsion yield was 800 ml.

Further, a photosensitive silver iodobromide emulsion was prepared from the silver iodobromide emulsion prepared above as follows.

a) Preparation of red-sensitive silver iodobromide emulsion 700 ml of the aforementioned silver iodobromide emulsion 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene 0.4 g gelatin 32 g sodium thiosulfate 10 mg a) Methanol 1% solution 80 ml Distilled water 1200 ml Sensitizing dye (a) b) Preparation of green-sensitive silver iodobromide emulsion 700 ml of the above silver iodobromide emulsion 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene 0.4 g gelatin 32 g sodium thiosulfate 10 mg The following sensitizing dye ( b) Methanol 1% solution 80 ml Distilled water 1200 ml Sensitizing dye (b) c) Preparation of blue-sensitive silver iodobromide emulsion 700 ml of the above silver iodobromide emulsion 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene 0.4 g gelatin 32 g sodium thiosulfate 10 mg The following sensitizing dye ( c) Methanol 1% solution 80 ml Distilled water 1200 ml Sensitizing dye (c) <Preparation of Organic Silver Salt Dispersion> 5-Methylbenzotriazole and silver nitrate were reacted with water-alcohol mixed solvent to obtain 2-methyl 5-methylbenzotriazole silver (28.8 g) and poly (N-vinylpyrrolidone) 16.0 g. , And 5-methylbenzotriazole 1.0 g
Was dispersed in an alumina ball mill to adjust the pH to 5.5 to 200 ml.

<Preparation of Dye Donor Dispersion> 112 g of the exemplified dye donor (PM-7), 4.0 g of the following hydroquinone compound and 1.0 g of the following antifoggant were added to 300 m of ethyl acetate
Dissolved in l, alkanol XC (manufactured by DuPont) 5% by weight
Aqueous solution 248 ml Mix with a gelatin aqueous solution 1440 ml containing 26.4 g of photographic gelatin and 34.6 g of phenylcarbamoylated gelatin (type 17819PC of Luslow), disperse with an ultrasonic homogenizer, distill off ethyl acetate and adjust to pH 5.5, 1590 ml.
And

Hydroquinone compound Antifoggant <Preparation of reducing agent solution> 93.2 g of the following reducing agent, polyvinylpyrrolidone (K-30)
20 wt% aqueous solution of 207 ml, 5 wt% aqueous solution of the following surfactant 40
The pH was adjusted to 7.0 and 600 ml with ml, water and an aqueous citric acid solution.

Surfactant (M and n each represent 2 or 3) Reducing agent <Preparation of hot solvent dispersion> Exemplary hot solvent pn-butoxybenzamide 430 g and polyvinylpyrrolidone (K-30) 1.0 wt% aqueous solution 1,410 ml
Was dispersed in a ball mill to obtain a hot solvent dispersion.

<Preparation of Photothermographic Material-1> A 180 μm thick transparent polyethylene terephthalate film for photography having an undercoat layer was wetted with the following coating solution.
Photothermographic material (sample No.-
1) was created.

(Composition of coating solution) Organic silver salt dispersion 64 ml Green-sensitive silver iodobromide emulsion 30.7 ml Reducing agent solution 38.4 ml Hot solvent dispersion 94.8 ml Dye donor dispersion 101 ml Photographic gelatin 10 wt% aqueous solution 21.1 ml Phenylcarbamoylated gelatin 10wt% aqueous solution 27.7ml citric acid aqueous solution and water (adjusting coating solution pH to 5.5) 89ml 2,4-dichloro-6-hydroxy-S-triazine sodium 2.5% aqueous solution 13.3ml total 480ml <Preparation of image receiving member-1> Polycarbonate (Molecular weight 25,000, L-1250 Teijin Kasei)
The ethylene chloride solution was applied onto photographic baryta paper and dried to prepare an image receiving member having a polycarbonate content of 15.0 g / m ² .

(Evaluation of Photosensitive Material) The photosensitive material obtained by the above method was exposed to 800 CMS of green through a step wedge.

Then, the polycarbonate coated surface of the image receiving member-1 and the exposed photosensitive material photosensitive layer surface are overlaid at 150 ° C.
After 90 seconds of thermal development and peeling off the image receiving member, a magenta transferred image was obtained on the image receiving member. The maximum reflection density (Dmax) and fog (Dmi) of the obtained magenta
n) is shown in Table-1.

Example-2 The same light-sensitive materials as in Example-1 except that the hot solvent of Example-1 was changed to the hot solvent shown in Table-1 [Sample Nos. 2 to 7 (invention), Samples 8 to 15 (comparative) )]made. The amount of hot solvent applied was the same as the amount of hot solvent applied in Example-1.

These samples were subjected to the same exposure and heat development as in Example-1 to obtain magenta transferred images on the image receiving member. Table-1 shows Dmax and Dmin of these images.

Example-3 (Stick Test of Photosensitive Material) Each of the photosensitive material samples Nos. 1 to 15 obtained in Examples 1 and 2 was left for 1 hour at 30 ° C. and 70% relative humidity, and then the conditions The emulsion side and the back side of the sample were weighted together and a pressure of 0.4 kg / cm ² was applied for 5 seconds, and then the sample was not pulled apart, and the sticking degree was tested. The results are shown in Table-1.

Evaluation ○ The sample does not stick △ It sticks but easily separates × It sticks and does not separate easily Example-4 (Preservability test) After the photosensitive material sample Nos. 1 to 15 of Examples 1 and 2 were allowed to stand for 24 hours under the conditions of 50 ° C. and relative humidity of 80%, the same exposure as in Example-1 was conducted. Thermal development was performed. Dmax of the obtained image and
Table 1 shows the sensitivity of each sample after leaving it with Dmin set to 100 before the sample was left under the above conditions.
2 is shown.

It weighs a cover glass without 1cm away placed on the heat plate Example 5 (sublimation test) same area of each of the light-sensitive material sample No.1~15 (3 × 3cm ²⁾ samples were above the emulsion surface Heated at 130 ° C and 145 ° C for 2 minutes. In the sample using the sublimable (or vaporizable) hot solvent, the hot solvent adhered to the cover glass. The sublimation property was judged based on the amount of the deposit. The results are shown in Table-3.

Evaluation ○ No sublimation (vaporization) △ A slight amount of sublimation (vaporization) × Sublimation (vaporization) × × Sublimation (vaporization) violently Note that when thermal development is performed using a hot solvent that is highly sublimable, development When the number of running times is increased, there is a defect that a thermal solvent adheres to the heat developing machine and a defect that image unevenness occurs due to sublimation.

Example-6 The photosensitive silver iodobromide emulsion was described in Example-1 except that the dye-donor substance of Example-1 was changed to PM-5 on a photographic transparent polyester terephthalate film having a thickness of 180 μm and having an undercoat layer. A coating solution having the same composition as in Example 1 except that the above red-sensitive silver iodobromide emulsion was used was coated at a wet film thickness of 65 μm to form a first photosensitive layer.

A first intermediate layer having the following composition was coated on the first photosensitive layer.

Gelatin 0.6 g / m ² Polyvinylpyrrolidone 0.3 g / m ² CD ′ scavenger 0.2 g / m ² Methylbenztriazole silver 0.6 g / m ² pn-butoxybenzamide 0.9 g / m ² 2,4-dichloro-6- Hydroxy-S-triazine sodium 20 mg / m ² Wetting the coating solution described in Example-1 on the first intermediate layer
The second photosensitive layer was formed by coating with a thickness of 45 μm.

On the second photosensitive layer, a second intermediate layer having a composition obtained by adding the following yellow filter dye (0.2 g / m ² ) to the composition of the first intermediate layer was applied.

Further, PM was added with the dye-donor of Example 1 on the second intermediate layer.
-1, except that the photosensitive silver iodobromide emulsion was changed to the blue-sensitive silver iodobromide emulsion described in Example-1, and a coating solution having the same composition as in Example-1 was applied at a wet film thickness of 65 μm. Then, the third photosensitive layer was formed.

Further, a protective layer having the following composition was coated on the third photosensitive layer to obtain a multilayer photosensitive material (Sample No. 16).

Gelatin 0.28g / m ² Polyvinylpyrrolidone 0.14g / m ² SiO ₂ 0.36g / m ² Saffron 1.0g / m ² pn-butoxybenzamide 0.42g / m ² <CD 'scavenger> And butyl acrylate copolymer (composition ratio 3: 2 molecular weight 11,800) <Y-filter> Copolymer of BA and BA (composition ratio 6: 5) 800 CMS for the obtained photosensitive material sample (Sample No. 16)
Was exposed to red light, green light, and blue light and subjected to the same thermal development as in Example 1, to obtain cyan, magenta, and yellow transferred images, respectively. The respective dye transfer image densities (Dmax and Dmin) are shown in Table-4.

Example-7 <Preparation of Dye Donor Dispersion Liquid> The following dye donor 30.0 g was dissolved in tricresyl phosphate 30.0 g and ethyl acetate 90.0 ml, and the same as in Example-1, a gelatin aqueous solution containing a surfactant 460 ml was prepared. After mixing with and homogenizing with an ultrasonic homogenizer, ethyl acetate was distilled off and water was added to bring the total volume to 500 ml.

<Preparation of Photothermographic Material> Blue-sensitive silver iodobromide emulsion (40.0 ml) described in Example-1, organic silver salt dispersion (25.0 ml), dye-providing substance dispersion (50.0 ml) were mixed,
Further, 14.1 ml of the hot solvent dispersion described in Example-1, 1.5 ml of a 10% by weight methanol solution of 1-phenyl-4,4'-dimethyl-3-pyrazolidone, and 3.00 ml of the same hardening agent as in Example-1.
And a guanidine trichloroacetic acid 10% by weight water-alcohol solution (20.0 ml) were added to give an undercoat thickness of 180 μm.
Photosensitive polyethylene terephthalate film of No. 1 was coated with a silver amount of 2.50 g / m ² to obtain a light-sensitive material (Sample No. 1
7) got.

<Preparation of Image Receiving Member-2> The following layers were sequentially coated on a transparent polyethylene terephthalate film having a thickness of 100 μm.

(1) A layer made of polyacrylic acid. (7.00 g / m ² ) (2) Layer made of cellulose acetate. (4.00 g / m ² ) (3) Styrene and N-benzyl-N, N-dimethyl-N-
Of (3-maleimidopropyl) ammonium chloride
Layer consisting of 1: 1 copolymer and gelatin.

(4) Urea and polyvinyl alcohol (saponification degree 98%)
A layer consisting of 1,600 for the sample No. 17 through the step wedge
After exposure to CMS and heat development for 1 minute at 150 ° C. in the heat developing machine together with the image receiving member-2, the image receiving member was immediately peeled off. The transmission density of the yellow transparent image obtained on the surface of the image receiving member was measured with a densitometer (PDA-65, manufactured by Konishi Roku Photo Industry Co., Ltd.), and the maximum density and the minimum density (fog) were measured.
Is shown in Table 5 below.

Example-8 101 g of the following dye-donor substance, 4.0 g of hydroquinone compound (described in Example-1) and antifoggant (Example-1)
1.0 g of the above) was dissolved in 300 ml of ethyl acetate, mixed with 248 ml of a 5% by weight aqueous solution of Alkanol XC (manufactured by DuPont) and 1440 ml of a gelatin aqueous solution containing 61 g of photographic gelatin, and dispersed with an ultrasonic homogenizer to obtain ethyl acetate. Was distilled off, and the pH was adjusted to 5.5 to 1590 ml.

The following coating solution was applied on a photographic baryter paper in a wet film thickness of 85 μm, and a 3% aqueous gelatin solution was applied in a wet film thickness of 20 μm and dried to obtain a photothermographic material (Sample No. 18).

(Composition of coating solution) Organic silver salt dispersion (as described in Example-1) 64 ml Green-sensitive silver iodobromide emulsion solution (as described in Example-1) 30.7 ml Reducing agent solution (Example-1) 38.4 ml Hot-solvent dispersion 94.8 ml Photographic gelatin 10 wt% aqueous solution 48.8 ml Citric acid aqueous solution and water (pH of coating solution adjusted to 5.5) 89 ml 2,4-dichloro-6-hydroxy-S-triazine sodium 2.5% aqueous solution 13.3 ml Total 480 ml The obtained light-sensitive material was exposed to 800 CMS of green light through a step wedge. Then, when heat development was performed at 145 ° C for 90 seconds, a magenta image [Dmax 2.0
8 Dmin 0.13] was obtained.

As shown in Examples 1 and 2, the photothermographic material using the compound (thermal solvent) of the present invention produces images of high density and low fog, and as shown in Example 3, the stickiness of the photosensitive material is also improved. Since it is not present, it is advantageous when manufacturing and storing the light-sensitive material.

Further, from Example-4, the photographic material of the present invention has good storability of the photographic material, and as shown in Example-5, the compound of the present invention does not sublimate at a temperature lower than the thermal development temperature. There is also no possibility of contaminating the toner or causing uneven transfer. None of the photothermographic materials using known compounds satisfy all the properties possessed by the photothermographic materials using the compounds of the present invention, and thus the photothermographic materials of the present invention are excellent. It can be seen that it has characteristics.

Further, the compound of the present invention is not limited to the monolayer photothermographic materials using the dye-donor substances shown in Examples 1 and 2, but also the multilayer photothermographic materials shown in Example-6 and Example-7. Photothermographic materials using other types of dye-providing substances, such as:
It works effectively for all photothermographic materials.

Continuation of the front page (56) Reference JP-A-57-190941 (JP, A) JP-A-59-19194 (JP, A) JP-A-63-161446 (JP, A) JP-A-59-230789 (JP , A) JP 61-210352 (JP, A) JP-B 2-51497 (JP, B2)

Claims (1)

[Claims] 1. A photosensitive layer and / or a non-photosensitive layer having a photosensitive silver halide, a reducing agent and a binder on a support and containing a compound represented by the following general formula (1). A photothermographic material which is characterized by: General formula (1) [In the formula, n represents 1 or 2, when n = 1, R represents an alkyl group, alkenyl group, alkoxy group or alkenyloxy group having 3 to 8 carbon atoms, and when n = 2, R represents 2 carbon atoms.
~ 4 alkyl group, alkoxy group or alkenyloxy group having 3 to 4 carbon atoms. ]