JPS62299847A - Heat developable photosensitive material superior in image contrast - Google Patents

Abstract

PURPOSE:To enhance raw storage stability and to obtain an image high in contrast by incorporating a development inhibitor in microcapsules. CONSTITUTION:The microcapsules contain the development inhibitor, preferably, represented by the formula shown on the right in which X is a photographic inhibitor residue; L is a divalent group; A is H, amino, OH, COOH, its salt, sulfo, its salt, sulfino, its salt, alkyl, (e.g., methyl, ethyl, i-propyl, butyl, t-butyl, octyl, or hexadecyl), or aryl (e.g., phenyl); and n is 0 or 1. Said X is an organic compound residue known as an inhibitor or fog inhibitor in the conventional photographic sensitive materials, and it has, preferably, a silver salt solubility produce (pKsp) of >=10 in the water at a temperature of 25 deg.C. The microcapsules to be used are added in an amount changed in accordance with the kinds of development inhibitors to be used, but usually, in an amount of 0.001-2.0g, preferably, 0.005-0.5g in terms of the development inhibitor per 1m<2> of the heat-developable photosensitive material.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a heat-developable photosensitive material, and more specifically, it relates to a photothermographic material that has a high maximum density of a formed image and a low minimum mtt. The present invention relates to a heat-developable photosensitive material with improved contrast.

BACKGROUND OF THE INVENTION] In recent years, heat-developable photosensitive materials whose development step can be performed by heat treatment have attracted attention as photosensitive materials.

Regarding such heat-developable photosensitive materials, for example,
No. 43-4921 and No. 43-4924 disclose a photosensitive material comprising an organic silver salt, a silver halide, a reducing agent, and a binder, and it was commercialized as dry silver by 3M21. There is.

Attempts have been made to improve such heat-developable photosensitive materials and obtain color images by various methods.

For example, U.S. Pat. No. 3,531,286, ll.
, 761.

No. 270 and No. 3.764.328, each of which describes a method of forming a dye image by the reaction of an oxidized product of an aromatic primary amine developing agent with a coupler, Research Disclosure V-(Research Disclosure V-(Research Disclosure) 1scl
osure ) 15108 and 15127, U.S. Pat. No. 4,021,240, etc., the oxidized form of a reducing agent (hereinafter also referred to as a developer or developing agent), which is a sulfonamide phenol or sulfonamide aniline derivative, and a coupler. A method of forming a dye image by reaction,
As disclosed in British Patent No. 1.590.956, a method of releasing a dye image on a separately provided image receiving layer by using an organic imino silver salt having a dye portion and releasing the dye in a heat development section; , JP-A No. 52-105821, No. 52-
No. 105822, No. 56-50328, U.S. Patent No. 4
, 235,957, etc., and a method for obtaining a positive dye image by a silver dye bleaching method disclosed in U.S. Patent No. 3.1.
No. 80.731, No. 3,985,565, No. 4,
Various methods have been proposed, such as the method of obtaining a dye image using a leuco dye disclosed in Japanese Patent Application Laid-open No. 022,617, No. 4,452,883, and Japanese Patent Application Laid-Open No. 59-206831.

However, these proposals regarding the heat-developable color light-sensitive materials have the disadvantages that it is difficult to bleach-fix the black, white, and silver images that are formed at the same time, that it is difficult to obtain clear color images, and that it is difficult to obtain clear color images. Since these methods require post-processing, they are still unsatisfactory for practical use.

In recent years, as a new type of color image forming method using heat development, Japanese Patent Application Laid-open Nos. 57-179840 and 57-186 have been developed.
No. 744, No. 57-198458, No. 57-2072
No. 50, etc., disclosed a method of obtaining a color image by transferring a diffusible dye released by thermal development.

By further improving these methods, for example, the non-diffusible reducible dye donor substance disclosed in JP-A-58-58453 and JP-A-59-168439 is oxidized to produce a diffusible dye. A method for releasing , JP-A-58-
No. 79247, No. 59-174834, No. 59-12
No. 431, No. 59-159159, No. 60-2950
A method of releasing a diffusible dye by coupling a non-diffusible reducing dye-donating substance with an oxidized developing agent as disclosed in JP-A No. 58-14904
No. 6, No. 58-149047, No. 59-12433
No. 9, No. 59-181345, No. 60-2950, Patent Application No. 59-181604, No. 59-182506
A method using a non-diffusible compound that reacts with an oxidized developing agent to form a diffusible dye, such as disclosed in No. 59-182507, No. 59-272335, etc.;
Furthermore, JP-A-59-152440, JP-A No. 59-124
No. 327, No. 59-154445, No. 59-1669
No. 54, etc., non-diffusible reducing dye-donating substances that lose their ability to release diffusible dyes when oxidized, and conversely, non-diffusible dye-donating substances that release diffusible dyes when reduced. Some methods have been proposed, such as methods for containing

The above-mentioned heat-developable photosensitive material obtains a color image by transferring the released or formed diffusible dye onto the image-receiving layer of an image-receiving element provided on the same support or another independent support. In terms of image sharpness, stability, etc., it has been improved in many respects compared to previous heat-developable color photosensitive materials.

The basic structure of a color type heat-developable photosensitive material that obtains a color image using these emitted or formed diffusive dyes is as follows:
It consists of a light-sensitive element and an image-receiving element, and the light-sensitive element basically contains a light-sensitive silver halide, an organic silver salt, a reducing agent, a dye-providing substance,
It consists of a binder. In the present invention, only the photosensitive element is referred to as a heat-developable photosensitive material in a narrow sense, and the image receiving element is referred to as an image receiving member.

However, with the above-mentioned silver image-forming black-and-white type and color type heat-developable photosensitive materials, when trying to obtain a sufficiently high image density, fog (thermal fog) at the minimum density becomes large, and storage of unexposed photosensitive materials increases. However, it has the disadvantage that fog increases considerably. This thermal fog phenomenon is thought to be due to the generation of fog nuclei on the surface of photosensitive silver halide or organic silver salt during thermal development, but the detailed mechanism is not clear.

On the other hand, various thermal antifoggants (hereinafter referred to as development inhibitors) for use in heat-developable photosensitive materials have also been proposed.

For example, the mercury compound of U.S. Patent No. 3,589,903, the N-henogeno compound of West German Patent No. 2,402,161, the peroxide of West German Patent No. 2,500,508, the peroxide of West German Patent No. 2,6
17,907 Sulfur Compounds, U.S. Pat. No. 4,102
．． Palladium compound No. 312, Special Publication No. 53-2841
Sulfinic acids No. 7, Research Disclosure No. 169077, Mercaptotriazole No. 169079, U.S. Patent No. 4,137,079-1
．． Examples include 2,4-triazole.

However, these development inhibitors are extremely harmful to the human body and have a low antifogging effect, so that no satisfactory product has yet been found.

In addition, certain types of development inhibitors can have an anti-fogging effect by increasing the amount added, but at the same time, this is accompanied by a decrease in maximum density, resulting in a problem of a decrease in contrast.

[Object of the Invention] Therefore, an object of the present invention is to provide a heat-developable photosensitive material that has excellent shelf life and can provide images with high contrast.

[Structure of the Invention] An object of the present invention is to provide a heat-developable photosensitive material having at least a photosensitive silver halide, a dye donor, a reducing agent, a binder, and a development inhibitor on a support, in which the development inhibitor is encapsulated in microcapsules. This was achieved by including

[Specific Structure of the Invention] The development inhibitor contained in the microcapsules used in the present invention will be explained.

The development inhibitor used in the present invention is preferably:
Those shown in the following general formula (1) are used.

General formula (1) % formula %) In the formula, X represents a residue of a photographic inhibitor, L represents a divalent group, and 8 represents a hydrogen atom, an amino group, a hydroxyl group,
Carboxyl group or its salt, sulfo group or its salt, sulfinic acid group or its salt, alkyl group (e.g. methyl group, ethyl group, i-propyl group, butyl group,
t-butyl group, octyl group, hexadecyl group, etc.), or an aryl group (eg, phenyl group, etc.). Further, n represents O or 1.

The residue of the photographic inhibitor represented by Publisher) pages 168-169, or The Theory of Photographic Process (T
, H. James (ed., Matsuku Millan Publishing) 396-399.
It is a residue of an organic compound known as an inhibitor (or antifoggant) in conventional silver halide photographic light-sensitive materials, as described on page 1, and is preferably a residue of an organic compound known as an inhibitor (or antifoggant) in conventional silver halide photographic materials. It is a residue of an organic compound with a salt solubility product (pKsp) of 10 or more.

Preferred examples of the case where the residue of X in the general formula (1) is a compound represented by It represents an aryl group, and M does not represent a hydrogen atom, an arumetal atom, an anthnium group, or an organic amine residue. 1°゛ 7M [R' represents an alkyl group or an aryl group, and M has the same meaning as M in general formula (2). ]tt'[R' is a hydrogen atom, an alkyl group, an aryl group, or 4! l', ), R2 and] (3 each) represent a hydrogen atom, a human [l xyl group, an alkyl group, an aryl group, or a sulfo group, and R2 and 173 are bonded to form a 5-yen or Lk
may form a 6-membered ring, 1 [R' represents a hydrogen atom, an alkyl group, or an aryl group, and R2 and R3 each represent a hydrogen atom, an alkyl group, an aryl group, an amino group, or a sulfo group; -, R2 and R3 may combine to form a 5-membered or 6d ring, 1 RI [Y represents -N-1-〇- or -8-], R1 is a hydrogen atom , represents an alkyl group or an aryl group, and M has the same meaning as M in general formula (2). ]R4' R4 represents a thiol group or -NH-R4(1(
1 represents a hydrogen atom, an alkyl group or an aryl group),
R2 and R3 each represent a hydrogen atom, an aryl group, or an aryl group, and R2 and R3 may be combined to form a 5- or 6-membered ring. 111R1 and R2 are hydrogen atoms, halogen atoms, alkyl groups, aryl groups, carboxyl groups,
It represents a salt of a sulfo group or a sulfo group, and R1 and R2 combine to form a 5-membered or (3@1 ring.
R', R2 and [3 are each a hydrogen atom, a human [1xyl group, an alkyl group, an amino group, an al]-(cy group, a buoalkoxy group, or -SM (M is M in general formula (2)) 1 S K' 11 sentences + , 11", R", R4 and R51; 1 each hydrogen atom, hydroxyl group 1 alnyl group, j' lyl group, -N Ll-116 (+76 is a hydrogen atom, a rahulkyl group! 1; I, represents an aryl group i, ), -5EM
(M has the same meaning as M in the general formula (2), and is 8.), j' 1 1 2 A group represents an alkoxy group. 1 K' IRI, R2, 1 at 3 7p January <
1 is name - general 1 (1 or I of (10)
It has the same meaning as 1<1. , 1 or less margins [RI and R2 each represent a hydrogen atom and an alkyl group,
M is the same as M in general formula (2). 1r<+,
-N HCN +-+ -R2 [R1 and R2 each represent a hydrogen atom, an alkyl group, or an aryl group, 1<1 and R2 combine to form a 5- or 6-membered ring, and -t3J
:stomach. 1[R1, R2 and 1s3 each represent a hydrogen atom, alkyl, an alkyl group, or an aryl group, and 1 or 1 and 1<2 are bonded, and ! -+ ltj or form a ring of 6 prisoners.

Y(Ma-0-1-8-also1c1-N-' (RM 1
1 hydrogen 75; 7]<1 child or alknyl group 371% - 9. ) [1 in 1 is a hydrogen atom, //Mino-Obi, Carbo-1
syl derivative, 1j'alkyl group or (also represents an aryl group 2,
Yl, 10-1-8- or -N, ll<'' represents a hydrogen atom, amino 11 or al-1,)
represents Fl, M CL-, which has the same meaning as M in general formula (2). 1-N [RI and R2 each represent hydrogen, an amine group, an alkyl group, or an aryl group, and [k1d[<2] may be bonded to form a 5- or 6-membered ring.

Y is -N- or -C- (+, 3 is a hydrogen atom, 1/;
1: 4 [<3 represents an alkyl group]. M has the same meaning as M in general formula (2). ] [Rj, R2 and R3 have the same meanings as R1 and ()RJ in general formula (14), 1te4 represents a hydrogen atom, an alkyl group, an alknyl group, and Yθ represents a counter anion,
, 1 In the general formulas (2) to (17), C is a nitrogen-containing hetero compound having a 13M group (M represents a hydrogen atom, an alkali metal atom, an ammonium group, or an organic amine residue) as a preferable photographic inhibitor residue. It is a residue of a ring, and has the general formula (3) or (7
) R is particularly preferred.

In the general formula (1), 1- represents a group of 211Ii, and L preferably represents an alkylene group having 1 to 7 carbon atoms (for example, a methionone group, a T-butionone group, a 1 pyrene group, etc.), arylene M (e.g. L; r++-), 2-2 (non group, loaf), 21-non group, etc.), imino group, carbonyl group, sulfonyl group, di- Contains chill groups or these 1! Represents an army (for example, λ, alkylene carbonylamino amine L, small nylamino M, etc.)! 11.

The compound according to the present invention represented by the general formula (1) is:
It is preferably represented by the following general formula (18).

---General formula (18) In the formula, 1- and n have the same meanings as L and n defined in the above-mentioned general formula (1), and A' is 1=dro-4-syl group,
Represents carboxyl or a salt thereof, or a sulfinic acid group or a salt thereof.

Hereinafter, typical examples of the development inhibitor used in the present invention will be shown, but the development inhibitor used in the present invention is not limited to these.

C2H.

The following margins (A-1) (A-2) (A-3
) (A-4) (A-5)
(A-6) (A-7) (A-8) (A-9) (A-10) (A-11) (
A-12) (A-13) (A
-14) (A-15) (A-1
6) (A, -1,7) (A-18) CH.

(A-19) (A-20)
(A-21) (A-22) (
A-23) (A-24) (A
-25) (A-26) (A
-27) (A-28) (A-
29) (A-30) (A-3
1) (A-32) (A-33)
(A-34) and 1-+
CtH*U(J(JH(A-35)
(A-36) (A-40) C,H.

(A-41) (A-42) (A-
43) (A-44) (A-45) (A-46) (A-47) (A-48) (A-49) The development inhibitor according to the present invention can be synthesized by a normal method. . For example, Chemitsu Berichte [Chem
ische Berichte J 8 6
S pp 314 (1953) and Canadian
journal op autochemistry (canaaean
Journal of ChesistryJ 37,
The method described in pH101 (1959), Journal
of chemical society r journal
of Chemical Society
4 9. 1) El 1748 (1927),
and JP-A-50-89034, JP-A No. 53-28426.
It can be synthesized by the method described in No.

The development inhibitors of the present invention can be used alone or in combination of two or more.

The microcapsules containing the development inhibitor of the present invention may be added to any layer of the photothermographic material, for example,
It can be added to the photosensitive layer, undercoat layer, intermediate layer, protective layer, etc., but it is preferably added to the photosensitive layer. At this time, the photosensitive layer and the image-receiving layer may be on separate supports or on the same support.

The amount of microcapsules containing the development inhibitor used in the present invention varies depending on the development inhibitor used, but
The amount of development inhibitor is usually 0.001 to 2.0 g per 112 of the photothermographic material, preferably 0.005 to G.
, 5g.

The present invention is characterized in that it is used by containing the development inhibitor in microcapsules, and if the amount of the development inhibitor is 50% or less of the total amount of the development inhibitor added, microcapsules may be used. It can also be contained in the photothermographic material separately from the development inhibitor in the capsule.

In the present invention, the microcapsules containing the development inhibitor only need to have the function of releasing the substance within the capsules when a predetermined amount of heat is applied.

That is, these functions are provided by the following method.

(a) A method of adding a thermally expandable substance into microcapsules as described in JP-A-56-119136; (b) A widely known method of adding a thermoplastic substance or There are methods such as using a heat-melting substance, and (c) a method of coating a porous outer wall with a liquid crystal material and discharging it by heat, as described in Okahata, Fine Chemicals, Vol. 13, p. 27 (1984). .

Specific examples of each of (a), (b), and (c) include the following compounds.

In the case of (a), cellulose, gelatin, gum arabic, acrylic resin, styrene resin, polyester resin, urethane resin, polyamide resin, epoxy resin, vinyl alcohol resin, etc. are used as the wall material.

Thermally expandable substances added to the microcapsules include compounds that decompose with heat and release nitrogen such as azobisisobutyronitrile and azobisisovaleronitrile, nitro-containing compounds such as trinitrotoluene and picric acid, and isobutylene. , butane, and other vaporizable substances are used.

In the case of (b), a polymeric material that melts at a temperature below the heat development temperature is used as the wall material. For example, styrene resins such as polystyrene and polychlorostyrene, acrylic resins such as polymethyl methacrylate, polymethyl acrylate, polyethyl acrylate, and polyethyl acrylate, thermoplastic resins such as polyester resins, polyethylene, polyoxyethylene, higher fatty acid amides, and higher fatty acid ester,
Waxes such as carnauba wax and beeswax are used.

In the case of (c), the porous outer wall is made of nylon etc. obtained by interfacial polymerization, and the liquid crystal material is used as the porous outer wall.
! In addition, the particle size of such microcapsules is 5 μm or less, preferably 1 μm or less.

Various encapsulation methods can be applied to produce the microcapsules containing the development inhibitor used in the present invention. For example, U.S. Patent Nos. 2,800.457, 2,800,458, 3,287.154, 3,418,250, 3,660,304,
No. 3,726,804, No. 3,796.669, British Patent No. 990.443, and Japanese Patent Application Publication No. 1983-113
One of the methods shown in No. 434 can be used.

In the present invention, a method for manufacturing microcapsules having an average particle size of 1 μm or less is particularly desirable, but such manufacturing methods can be broadly classified into the following two types.

One is interfacial polymerization using emulsification such as electroemulsification.
The other method is so-called micelle polymerization, in which polymerization is performed after micelle formation. It is not possible to use both methods for all substances in which development inhibitors are to be incorporated. That is, in the interfacial polymerization method, for example, it is impossible to use a substance that easily reacts with acid chlorides, and in the micelle polymerization method, it is not possible to use a substance that prevents radical reactions.

The method for producing microcapsules is described by G. Barenpack and P.P.S.

Birrenback, P, P, 5l) eis
er), Journal of Pharmaceutical Sciences
tical 5sciences), 65 (12) p.
1763-1766 (1976), P. Tulkens, M. Roland nie Troets, P. Tulkens, M. Roland
.

, A., Trouet, P., 5peiser)
, F.E.B. Letters (F, E,
B, S, Letters), 84 (2') 11
．． 323 (1977)
(P, 5peiser) etc. J: Rumi t' /L/
i Goi, Wave Power, Higashitsuji, Six Sawa (A, Watanab
e, K.

Higashitsuji, K., Nishi
zawa), Journal of Colloids and
Interface Science (Journal of
Co11oid and lnterface 3c
ience), 64 (2) D, 278 (1978
2000), previous edition, Kin H (M, ArakaWa, Wang).

1 (ondo), Canadian Journal of Physiology and Pharmacology (Canadi
a Journal of Physioloay
andPharIIlacolooV > 58 (2
), p. 183 (1989), etc. are advantageously used.

When the heat-developable photosensitive material of the present invention is a color type, a dye-providing substance is used.

Dye-providing substances that can be used in the present invention will be explained below. The dye-donating substance may be any substance as long as it participates in the reduction reaction of the photosensitive silver halide and/or the organic silver salt used as necessary and can form or release a diffusible dye as a function of the reaction. Depending on their reaction form, negative-acting dye-donors act on a positive function (i.e., form a negative dye image when negative-working silver halide is used) and positive-acting substances act on a negative function. It can be classified as a dye-providing substance (that is, it forms a positive dye image when negative-working silver halide is used). Negative dye-donating substances are further classified as follows.

Releases a diffusible dye when oxidized Release type compound Formation type compound proboscis The respective dye-donating substances will be further explained.

Examples of the reducible dye-releasing compound include compounds represented by general formula (2).

General formula (2) % formula % In the formula, Car represents j! of the photosensitive silver halide and/or the organic silver salt used as necessary. D
Vf3 is a diffusible dye residue.

Specific examples of the above-mentioned reducing dye-releasing compounds include JP-A-57-179840, JP-A-58-116537, and JP-A No. 58-116537.
No. 9-60434, No. 59-65839, No. 59-7
No. 1046, No. 59-87450, No. 59-8873
No. 0, No. 59-123837, No. 59-165054
No. 59-165055 and the specifications thereof, and examples thereof include the following compounds.

Exemplary dye-providing substance ■ OC+aHss fnl OC+Revision-I33 ■ θ [Phase] [Phase] ■ 0 Other reducing dye-releasing compounds include, for example, -. General formula (3
) are listed.

A.

In the formula, A1 and A2 each represent a hydrogen atom, a hydroxy group, or an amino group, and Dye is DVe represented by the general formula (2).
is synonymous with Specific examples of the above compounds are given in JP-A-59-12
This is shown in Japanese Patent No. 4329.

As a coupled dye-releasing compound, general formula (4) is used.
Examples include compounds represented by:

General formula (4) % formula % In the formula, Cpl is a taJI group (so-called coupler residue) that can react with the oxidized form of the reducing agent to release a diffusible dye, and J is a divalent bond. The bond between Cpl and J is cleaved by reaction with the oxidized form of the reducing agent. n
l represents O or 1, and 1')ye has the same meaning as defined in general formula (2). Further, C11+ is preferably substituted with various ballast groups in order to make the coupled dye-releasing compound non-diffusible.
or more (more preferably 12 or more) organic groups, or hydrophilic groups such as sulfo groups or carboxy groups, or 8 or more (more preferably 12 or more)
More preferably, it is a group having both carbon atoms (12 or more) and a hydrophilic group such as a sulfo group or a carboxy group. Another particularly preferred ballast group can include polymer chains.

Specific examples of the compound represented by the above general formula (4) include JP-A-57-186744 and JP-A-57-122596.
No. 57-16069 August, No. 59-174834, No. 57-224883, No. 59-159159,
They are described in each specification of No. 59-231540, and include, for example, the following compounds.

As an exemplary dye-donor coupling dye-forming compound, general formula (5) is used.
Examples include compounds represented by:

General formula (5) % formula %) In the formula, CD2 is an organic group that can react (coupling reaction) with the oxidized product of the reducing agent to form a diffusible dye (
F represents a divalent bonding group, and B represents a ballast group.

The coupler residue represented by CD2 preferably has a molecular size of 700 or less for the diffusibility of the dye formed.
More preferably it is 500 or less.

Further, the ballast group is preferably the same as the ballast group defined in general formula (4), and particularly has 8 or more (more preferably 12 or more) carbon atoms and a hydrophilic group such as a sulfo group or a carboxy group. Groups having both are preferred, and polymer chains are more preferred.

The coupled dye-forming compound having a polymer chain is preferably a polymer having a repeating unit derived from a monomer represented by general formula (6).

General formula (6) % formula %) In the formula, CD2 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 e 1. t represents o or 1,
Z represents a divalent organic group, and Z represents an ethylenically unsaturated group or a group having an ethylenically unsaturated group.

Specific examples of the coupled dye-forming compounds represented by general formulas (5) and (6) include JP-A-59-1243
No. 39, No. 59-181345, No. 60-295
No. 0, Japanese Patent Application No. 59-179657, No. 59-1816
No. 04, No. 59-182506, No. 59-18250
It is described in each specification of No. 7, etc., and the following compounds are mentioned, for example.

Exemplary dye-donor substances polymer M-1 x: 80-fold fits y: 20IIIffi% M-2 x: 50'N, flt% Y: 50Ib: 11% PM-36H3 M-4 Hs x: 40] i quantity y: 60% by weight M-5 CH.

H : 50'' JL quantity In the above general formulas ゛(4), (5) and (6), C
To explain in more detail the coupler fortress defined by p+ or C20, groups represented by the following general formula are preferred.

General formula (7) General formula (8) General formula (9
) General formula (10) General formula (11)
General formula (12) General formula (13)
General formula (14) General formula (15)
In the general formula (16), R7, R8, R9 and R10 are each a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aryl group, an acyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, an alkylsulfonyl group, Arylsulfonyl group, carbamoyl group, sulfa-11yl group, acyloxy group, amiLL alkoxy group, aryloxy group, cyano group, alkylsulfonyl group, arylsulfonyl group, ureido group, alkyldio group, arylthio group, carboxy group, sulfo group, or Represents a heterocyclic residue, which further includes a hydroxyl group, a carboxy group, a sulfo group, an alkoxy group, a cyano group, a nitro group, an alkyl group, an aryl group, an aryloxy group, an acyloxy group, an acyl group, a sulfamoyl group, a carbamoyl group, an imide group. It may be substituted with a group, a halogen atom, etc.

These substituents are selected depending on the purpose of Cpl and CI)2, and as mentioned above, in <CD+, one of the substituents is preferably a ballast group, and in CI)2, it is preferable to Molecular weight is 700 to increase sex.
Hereinafter, it is preferable that @ substituents are selected so that the number is preferably 500 or less.

As a positive dye-donating substance, for example, the following general formula (1
There is an oxidizable dye-releasing compound represented by 7).

General formula (17) In the formula, Wl represents a collection of atoms necessary to form a quinone ring (which may have a direct substituent on this ring),
R represents an alkyl group or a hydrogen atom, and E represents -N-C+R+ (in the formula, R represents an alkyl group or a hydrogen atom, R represents an oxygen atom or a hydrogen atom) or -802- where r is O
or 1, and Dye has the same meaning as defined in general formula (2). A specific example of this compound is JP-A-59-1
It is described in specifications such as No. 66954 and No. 59-154445, and includes, for example, the following compounds.

Exemplary dye-donor substances @ Goods.

[Phase] [Phase] Another positive dye-providing substance is represented by the following general formula (18)
There are compounds that lose their dye-releasing ability when oxidized, such as the compound represented by:

General formula (18) In the formula, W2 represents a collection of atoms necessary to form a benzene ring (which may have a substituent on the ring), and R''
1r and ElDye have the same meaning as defined in general formula (17). A specific example of this compound is JP-A IIH
It is described in specifications such as No. 55-124327M and No. 59-152440, and includes, for example, the following compounds.

I W Toshiro −“″ Exemplary dye (1 (thick substance) O OCH.

[Phase] Yet another positive dye-providing substance Toji C has the following general formula (
19) Compounds represented by t" are mentioned. In the general formula (19)
) has the same meaning as defined in ).

Specific examples of this compound are described in JP-A-59-154445, etc., and include the following compounds.

The following 4 remainders, the whites of the eyes, ゛Exemplary dye-providing substances■ Middle j- General formulas (2), (3), (4), (17) (18)
) and (19), the residue of the diffusible dye represented by Dye will be explained in further detail. The residue of the diffusible dye preferably has a molecular weight of 800 or less, more preferably 600 or less, for the sake of 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 increasing the light resistance of images, for example, in
Chelatable dye residues described in No. 48765 and No. 59-124337 are also preferred.

These dye-providing substances 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, 0.005Q to 50g, preferably 0.1g to 10g per 1-I2.

The dye-providing substance used in the present invention can be incorporated into the photographic constituent layer of the heat-developable light-sensitive material by any method. Geoku Dilftale
1, tricresyl phosphate, etc.) and then subjected to ultrasonic dispersion, or dissolved in an alkaline aqueous solution (e.g., 10% aqueous sodium hydroxide solution, etc.), and then dissolved in a mineral acid (
For example, it can be used after being neutralized with hydrochloric acid or nitric acid, or after being dispersed with an appropriate polymer aqueous solution (eg, gelatin, polyvinyl butyral, polyvinyl pyrrolidone, etc.) using a ball mill.

The photosensitive silver halides used in the present invention include silver chloride, silver bromide, silver iodide, silver chlorobromide, silver chloroiodide, silver iodobromide,
Examples include silver chloroiodobromide. The photosensitive silver halide is
It can be prepared by any method in the photographic field, such as a single jet method or a double jet method. For example, by applying the method described in JP-A-54-48521, monodisperse silver halide grains can be obtained by the double jet method while keeping pA(+ constant. Highly monodisperse silver halide emulsions can be obtained by appropriately selecting the velocity time function, pH, pl+, temperature, etc. According to a further preferred embodiment, silver halide grains with shells are A silver halide emulsion having shells can be used.Silver halide grains having shells can be obtained by sequentially growing shells on a core of silver halide grains having good monodispersity using the method described above. (It can be obtained by

The monodisperse silver halide emulsion used in the present invention refers to an emulsion having a particle size distribution in which the variation in the silver halide grain size contained in the emulsion is less than a certain percentage of the average grain size as shown below. .

Since the grain size distribution of an emulsion (hereinafter referred to as a monodisperse emulsion) consisting of a group of photosensitive silver halide grains with a uniform grain morphology and small variation in grain size is almost a normal distribution, the standard deviation can be easily determined. The width of the distribution of the silver halide grains involved is preferably 15% or less, more preferably 10% or less.

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

Further, in the present invention, a silver halide emulsion containing internal latent image type silver halide grains whose surfaces have not been fogged in advance can be used. For internal latent image type silver halide whose surface is not prefogged, for example, U.S. Pat.
．． No. 592.250, No. 3,206.313, No. 3
, No. 317,322, No. 3,511,662, No. 3
．． No. 447,927, No. 3.761.266, No. 447,927, No. 3.761.266, No.
As described in No. 3.703.584, No. 3.736.140, etc., this silver halide grain has a higher sensitivity inside the grain than the surface sensitivity of the silver halide grain. The method for producing silver halide emulsions containing these internal latent image type silver halides is as described in the above-mentioned patent, for example, by first preparing AOCffi grains and then adding bromide or a small amount of iodide thereto. A method in which the central core of chemically sensitized silver halide is coated with non-chemically sensitized silver halide,
Alternatively, many methods are known, such as a method in which a chemically sensitized coarse grain emulsion is mixed with a chemically sensitized or non-chemically sensitized fine grain emulsion, and a fine grain emulsion is deposited on the coarse grain emulsion. Also, U.S. Patent Nos. 3.271.157 and 3.4.
47.927 and 3.531.291, or silver halide emulsions having silver halide grains incorporating polyvalent metal ions, or U.S. Pat.
Silver halide emulsions whose grain surfaces are weakly chemically sensitized containing silver halide grains containing dopants as described in JP-A-50-8524 and JP-A-50-8524 and JP-A-50-8524.
Silver halide emulsions consisting of grains having one layer and one structure as described in JP-A No. 0-38525@, etc., and other JP-A-52-1
These include silver halide emulsions described in No. 56614 and JP-A-55-127549.

The light-sensitive silver halide emulsion may be chemically sensitized by any method known in the photographic art. Such sensitization methods include
Various methods include gold sensitization, sulfur sensitization, gold-sulfur sensitization, and reduction sensitization.

The silver halide in the above-mentioned photosensitive emulsion 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, and more preferably about 0.001 μm to about 1.5 μm. .01 μm to about 0.5 μm corner.

The photosensitive silver halide emulsion prepared as described above can most preferably be applied to the heat-developable photosensitive layer which is a constituent layer of the photosensitive material of the present invention.

In the present invention, as another method for preparing photosensitive silver halide, it is also possible to allow a photosensitive silver salt-forming component to coexist with an organic silver salt described below to form photosensitive silver halide in a part of the organic silver salt. . The photosensitive silver salt forming component used in this preparation method is an inorganic halide, for example, a halide represented by MXn (where M is 1-1 atom, N+-
14 groups or a metal atom, X represents Cff1, Sr, or I, n represents M is a H atom, N1 (1 in the case of 4 groups)
, When M is a metal atom, its valence is shown. As metal atoms, lithium, sodium, potassium, rubidium I\
, cesium, copper, gold, beryllium, magnesium, calcium, strontium, barium, zinc, cadmium, mercury, aluminum, indium, lanthanum, ruthenium, thallium, germanium, tin, lead, antimony,
Examples include bismuth, chromium, molybdenum, tungsten, manganese, rhenium, iron, cobalt, nickel, rhodium, palladium, osmium, iridium, platinum, and cerium. ), halogen-containing metal complexes (e.g.

K2 Pt C16, ni2 Pt Br s
, HAU C1+.

(NH4)2 Ir Cff1s, (NH+)3
1r C16.

(NH4)2 RLI Cj! s, (NH+)
3 RU Cj2s.

(NH4)2 Rh Cff1s, (NH+)
3 Rh 13rs, etc.), onium halides (e.g., tetramethylammonium bromide, trimethylphenylammonium bromide, cetylethyldimethylammonium bromide, 3-methylthiazolium bromide, trimethylbenzyl ammonium bromide, quaternary ammonium halides such as tetramethylammonium bromide, tetramethylammonium bromide, trimethylbenzylammonium bromide, quaternary phosphonium halides such as phosphonium bromide, tertiary sulfonium halides such as benzylethylmethylsulfonium bromide, 1-ethylthiazolium bromide, etc.), halogenated hydrocarbons (e.g. iodoform, bromoform, carbon, 2-bromo-2-methylpropane, etc.), N-halogen compounds (
N-chlorosuccinimide, N-bromosuccinimide, N-bromophthalimide, N-bromoacetamide, N-iodosuccinimide, N-bromophthalazinone, N-chlorophthalazinone, N-bromoacetanilide, N,N -dibromobenzenesulfonamide, N-bromo-N-methylbenzenesulfonamide, 1,3-dibromo-4,4-dimethylhydantoin, etc.), other halogen-containing compounds (such as triphenylmethyl chloride, triphenylmethyl bromide, 2-bromobutyric acid, 2-bromoethanol, etc.).

These photosensitive silver halides and photosensitive silver salt-forming components can be used in combination in various methods, and the amount used is preferably 0.001 g to 500 g per layer, and more preferably is 0.10~To
(It is l.

The heat-developable photosensitive material of the present invention has a multilayer structure including each layer sensitive to blue light, green light, and red light, that is, a heat-developable blue-sensitive layer, a heat-developable green-sensitive layer, and a heat-developable red-sensitive layer. You can also do that. Further, the same color photosensitive layer can be divided into two or more layers (for example, a high-sensitivity layer and a low-sensitivity layer).

In the above case, the blue-sensitive silver halide emulsion, green-sensitive silver halide emulsion, and red-sensitive silver halide emulsion used, respectively, can be obtained by adding various spectral sensitizing dyes to the silver halide emulsion. I can do it.

Typical spectral sensitizing dyes used in the present invention include, for example, cyanine, merocyanine, complex (trinuclear or tetranuclear) cyanine, holopolar cyanine, styryl, hemicyanine, A-xonol, and the like. Among the cyanine dyes, those having a basic nucleus such as deazoline, oxazoline, viroline, pyridine, oxazole, thiazole, selenazole, and imidazole are more preferred. Such nuclei include alkyl groups, alkylene groups,
It may contain a hydroxyalkyl group, a sulfoalkyl group, a carboxyalkyl group, an aminoalkyl group, or an enamine group capable of forming an integrated carbocyclic or heterocyclic ring. Further, it may be symmetrical or asymmetrical, and the methine chain or polymethine chain may have an alkyl group, a phenyl group, an enamine group, or a heterocyclic substituent.

In addition to the above-mentioned basic nucleus, merocyanine dyes have acidic nuclei such as thiohydantoin nucleus, rhodanine nucleus, oxazolidione nucleus, thiazolidinedione nucleus, barbylic acid nucleus, thiazolinthione nucleus, malonitrile nucleus, and pyrazolone nucleus. Good too.

These acidic nuclei may be further substituted with an alkyl group, an alkylene group, a phenyl group, a carboxyalkyl group, a sulfoalkyl group, a hydroxyalkyl group, an alphkydialkyl group, an alkylamine group or a heterocyclic nucleus. If necessary, these dyes may be used in combination.

Furthermore, ascorbic acid derivatives, azaindene cadmium salts, organic sulfonic acids, etc., such as U.S. Pat. No. 2.933.3
A supersensitizing additive that does not absorb visible light, such as those described in the specifications of No. 90 and No. 2,937,089, can be used in combination.

The amount of these sensitizing dyes added is 1.times.10@-4 mol to 1 mol per mol of photosensitive silver halide or silver halide forming component. More preferably, 1X10-4 mol-1X1
It is 0-1 mole.

The reducing agent used in the heat-developable photosensitive material II of the present invention is the heat-developable photosensitive material II! Those commonly used in the field of I can be used.

The dye-providing substance used in the heat-developable photosensitive material r1 of the present invention is, for example, JP-A-57-186744;
No. 8-79247, same; No. 8-149046, same 58
-1490117, No. 59-124339, No. 59
Dye-donor that releases or forms a 4'J dye in the extended t' by coupling with an oxidized form of a reducing agent as disclosed in Japanese Patent Nos.-181345 and 60-2950, etc. In the case of a substance, the reducing agent used in the present invention includes, for example, U.S. Pat. No. 3,531.286;
, No. 761,270, No. 3.764.328, each specification, R I) No. 12146, No. 12146, No. 3.764.328
15108, same N O, 15127 OJ: and JP-A-1983
p-phenylenediamine type and p-amine phenol type developing agent described in Publication No.-27132, Phosph 71
r] Amidophenol type, sulfonamide 71-nol type developing agent, sulfone 7 middle aniline type developing agent, and hydrazone type coloring agent 1! A@You can use the main story, etc.

Also, U.S. Patent Nos. 3,342,599 and 3,71
4), No. 492, JP-A No. 53-135G28, No. 57
The color developer 1Φ main agent breaker described in No. 79035 and the like can also be used for the right hand.

A particularly preferable reducing agent is JP-A-56-146133
Examples include reducing agents represented by the following general formula (1) described in No.

In the formula, R1 and](2 are hydrogen atoms, or 1= may have a substituent.
), R1 and R2 may be closed to form a heterocycle, R3, R''.

R5 and R6 each have a hydrogen atom, a halogen atom, a hydroxy group, an amino group, an alkoxy group, an acylamido group, a sulfonamide group, an alkylsulfonamide group, or a carbon atom number of 1 to 30 (preferably 1 to 30) that may have a substituent. 4)
represents an alkyl group, and R3 and R1 and R5 and R2 may each be closed to form a heterocycle. M represents an alkali metal atom, an ammonium group, a nitrogen-containing organic base, or a compound containing a quaternary nitrogen atom.

The nitrogen-containing organic base in the above general formula (1) is an organic compound containing a nitrogen atom that exhibits basicity capable of forming a salt with an inorganic salt, and particularly important organic bases include amine compounds. Chain amine compounds include primary amines, secondary amines, tertiary amines, etc., and cyclic amine compounds include lysine, quinoline, and other well-known examples of pathological heterocyclic organic bases. Examples include piperidine and imidazole. In addition, compounds such as hydroxylamine, hydrazine, and amidine are also useful as chain amines. As the salt of the nitrogen-containing VSS group, inorganic acid salts of organic bases such as those mentioned above (eg, hydrochloride, sulfate, nitrate, etc.) are preferably used.

On the other hand, examples of the compound containing quaternary nitrogen in the above general formula include salts or hydroxide compounds of nitrogen compounds having a tetravalent covalent bond.

Next, preferred specific examples of the reducing agent represented by the general formula (1) are shown below.

(R-5) (n, -8) l (T't-9) (1,-10) (R, -11) (R-12) 0”-Nnhl, 1s O*Na CI-I.

(It-1,7) (1m, -20') (]11.-21) (11,-23) (R-24) (R-25) (R-26) (R-27) (R- 28> (R-29) (R-30) The reducing agent represented by the above general formula (1) can be prepared by a known method,
For example, Houben Peil, Metozan der Organizien Hemi, Band XI/2 (Houben-
Weyl, Methoden der Oroani
schen Chemie, Band X I/
2) It can be synthesized according to the method described on pages 645-703.

Furthermore, it is also possible to use two or more of the above-mentioned reducing agents at the same time, or to use a black and white developing agent described below in combination for the purpose of increasing developability.

Further, the dye-donating substance used in the present invention is JP-A No. 57-179840, No. 58-58543, No. 5
In the case of compounds that release dyes upon oxidation, compounds that lose their ability to release dyes when oxidized, compounds that release dyes when reduced, etc. as shown in Nos. 9-152440 and 59-154445, etc. Alternatively, in the case where only a silver image is simply obtained, a developing agent as described below can also be used.

For example, phenols (e.g. p-phenylphenol, p-methoxyphenol, 2,6-di-tert-butyl-p-cresol, N-methyl-〇-aminephenol, etc.), sulfonamidophenols [e.g. 4-benzene Sulfonamidophenol, 2-benzenesulfonamidophenol, 2,6-dichloro-4-benzenesulfonamidophenol, 2,6-dipromo 4-(
p-toluenesulfonamide) phenol, etc.], or polyhydroxybenzenes (e.g. hydroquinone, t
ert-butylhydroquinone, 2,6-dimethylhydroquinone, chlorohydroquinone, carboxyhydroquinone, catechol, 3-butylhydroquinone, etc.)
, naphthols (e.g. α-naphthol, β-naphthol, 4-aminonaphthol, 4-methoxynaphthol, etc.), hydroxybinaphthyls and methylene bisnaphthols [e.g. 1,1'-dihydroxy-2,2'-
Naphthyl, 6,6'-dibromo-2,2'-dihydroxy-1,1'-binaphthyl, 6,6-sinitro2.
2'-dihydroxy-1,1'-binaphthyl, 4.4'
-dimethoxy-1,1'-dihydroxy-2,2'-binaphthyl, bis(2-hydroxy-1-naphthyl)methane, etc.], methylenebisphenols [e.g. 1,1-bis(2-hydroxy-3,5- dimethylphenyl)-3
゜5.5-Trimethylhexane, 1,1-bis(2-hydroxy-3-tert-butyl-5-methylphenyl)methane, 1,1-bis(2-hydroxy-3,5-di-tert-butylphenyl) ) methane, 2,6-methylenebis(2-hydroxy-3-tert-butyl-5-
methylphenyl)-4-methylphenol, α-phenyl-α, α-bis(2-hydroxy-3-tert-butyl-5-methylphenyl)methane, 1,1-bis(2
-hydroxy-3,5-dimethylphenyl)-2-methylpropane, 1,1,5,5-tetrakis(2-hydroxy-3,5-dimethylphenyl)-2,4-ethylpentane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl)propane, 2,2-bis(4-hydroxy-3-methyl-5-tert-butylphenyl)propane, 2,2-bis(4-hydroxy-3,5 -G-t
ert-butylphenyl)propane, etc.], ascorbic acids, 3-pyrazolidones, pyrazolones, hydrazones, and paraphenylenediamines.

These imaging agents mentioned above can also be used alone or in combination of two or more.

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, the type of organic acid silver salt, and the type of other additives used, but usually is 0.01 per mole of photosensitive silver halide
-1500 mol, preferably 0.1-20
It is 0 mole.

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 used in the heat-developable photosensitive material of the present invention include those disclosed in Japanese Patent Publication Nos. 43-4921, 52626-1980, 141222-1982, 36224-1983, and 37610-1980, etc. Long-chain aliphatic carboxylic acids as described in each publication and the specifications of U.S. Patent Nos. 3,330,633, 3,794,496, 4,105,451, etc. Silver salts of carboxylic acids having heterocycles, such as silver laurate, silver myristate, silver palmidate, silver stearate, silver arachidonate, silver behenate, silver α-(1-phenyltetrazolethio)acetate etc., silver aromatic carboxylates, such as silver benzoate, silver phthalate, etc., Japanese Patent Publication No. 44-26582, No. 4
No. 5-12700, No. 45-18416, No. 45-2
No. 2185, JP-A-52-137321, JP-A-58
There are silver salts of imino groups described in publications such as No.-118638, No. 58-118639, and U.S. Pat. No. 4,123,274.

Examples of silver salts of imino groups include penztriazole silver. The penztriazole silver may be substituted or unsubstituted. Typical examples of substituted penttriazole silver include, for example, alkyl-substituted penttriazole silver (preferably a C22 or less alkyl group,
More preferably, those substituted with an alkyl group of C+ or less, such as silver methylbenztriazole, silver ethylpenztriazole, silver n-octylbenztriazole, etc.), silver alkylamide benztriazole (preferably with an alkylamide group of 022 or less) Substituted ones, such as silver acetamidobenztriazole, silver propionamidebenztriazole, silver 1so-butylamidobenztriazole, silver laurylamidebenztriazole, etc.), silver alkylsulfamoylbenztriazole (preferably silver alkylsulfamoylbenztriazole of 022 or less) those substituted with a moyl group, such as silver 4-(N,N-diethylsulfamoyl)benztriazole, silver 4-(N-propylsulfamoyl)benztriazole, silver 4-(N-diethylsulfamoyl)benztriazole,
-octylsulfamoyl)penztriazole silver, 4
-(N-decylsulfamoyl)penztriazole silver, 5-(N-octylsulfamoyl)penztriazole silver, etc.), silver salts of halogen-substituted benztriazoles (such as 5-chlorobenztriazole silver, 5-bromobenztriazole silver), triazole silver, etc.), alkoxybenztriazole silver (preferably substituted with an alkoxy group of 022 or less, more preferably an alkoxy group of 04 or less),
For example, silver 5-methoxybenztriazole, silver 5-toxybenztriazole, etc.), silver 5-nitrobenztriazole, silver 5-aminobenztriazole, silver 4-hydroxybenztriazole, silver 5-carboxybenztriazole, silver 4-sulfonatetriazole, etc. Benztriazole silver, 5-
Examples include silver sulfobenztriazole.

Examples of other silver salts having an imino group include imidazole silver, benzimidazole silver, 6-nitropenzimidazole silver, pyrazole silver, urazole silver, 1.2
．． Silver salts of other mercapto compounds such as 4-triazole silver, 1H-tetrazole silver, 3-amino-5-benzylthio-1,2,4-triazole silver, saccharin silver, phthalazinone silver, phthalimide silver, etc., such as 2-mercaptobenzoxazole silver, mercaptooxadiazole silver, 2-mercaptobenzothiazole silver, 2-mercaptobenzimidazole capto-4-phenyl-1.2.4-triazole silver,
4-hydroxy-6-methyl-1,3.

3a,7-thitrazaindene silver and 5-methyl-7-
Examples include silver hydroxy-1.2.3.4.6-pentazaindene.

In addition, mIl compounds with a stability constant of 4.5 to 10.0 as described in JP-A No. 52-31728, imidases as described in U.S. Pat. No. 4,168,980, A silver salt of lynchion or the like is 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 derivatives, and N-alkylsulfamoylbenzotriazole and its derivatives.

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

In addition, the method for preparing organic silver salts is generally to dissolve silver nitrate and raw organic compounds in water or an organic solvent and mix them, but if necessary, a binder may be added or a solution such as sodium hydroxide may be added. It is also effective to add an alkali to promote dissolution of organic compounds, or to use an ammoniacal silver nitrate solution.

The amount of the organic silver salt used is generally preferably 0.01 to 500 mol, more preferably 0.1 to 100 mol, per 1 mol of photosensitive silver halide. More preferably 0
．． It is 3 to 30 moles.

Examples of the binder used in the heat-developable photosensitive material of the present invention include synthetic or natural polymers such as polyvinyl butyral, polyvinyl acetate, ethyl cellulose, polymethyl methacrylate, cellulose acetate butyrate, polyvinyl alcohol, polyvinylpyrrolidone, gelatin, and phthalated gelatin. One or more molecular substances can be used in combination. In particular, it is preferable to use gelatin or a derivative thereof together with a hydrophilic polymer such as polyvinylpyrrolidone or polyvinyl alcohol, and more preferably the following binder described in JP-A-59-229556.

This binder includes gelatin and vinylpyrrolidone polymer. The vinylpyrrolidone polymer may be polyvinylpyrrolidone, which is a homopolymer of vinylpyrrolidone, or a copolymer (graft copolymer) with one or more of other heptamers copolymerizable with vinylpyrrolidone. ) may be included. These polymers can be used regardless of their degree of polymerization. The polyvinylpyrrolidone may be substituted polyvinylpyrrolidone, and preferred polyvinylpyrrolidone has a molecular weight of 1,000 to 4.
00,000. Other monomers copolymerizable with vinylpyrrolidone include (meth)acrylic acid esters such as acrylic acid, methacrylic acid and alkyl esters thereof, vinyl alcohols, vinyl acetates, vinyl imidazoles, (meth)acrylamides,
Examples include vinyl monomers such as vinyl carbinols and vinyl alkyl ethers, but it is preferable that polyvinylpyrrolidone accounts for at least 20% (weight %, same hereinafter) of the composition ratio. Preferred examples of such copolymers have a molecular weight of 5,000 to 400,000.

The gelatin may be lime-treated or acid-treated, and may be ossein gelatin, big skin gelatin, hydrogelatin, or modified gelatin obtained by esterifying or phenylcarbamoylating these gelatins.

In the above binder, gelatin preferably accounts for 10 to 90% of the total binder area, more preferably 20 to 60%, and vinylpyrrolidone accounts for 5 to 90%.
It is preferably 10 to 80%, more preferably 10 to 80%.

The binder may contain other polymeric substances,
Gelatin and a mixture of polyvinylpyrrolidone with a molecular weight of 1,000 to 400,000 and one or more other polymeric substances, gelatin and a molecular weight of 5,000 to 400,0
A mixture of the vinylpyrrolidone copolymer No. 00 and one or more other polymeric substances is preferred. Other polymeric substances that can be used include polyvinyl alcohol, polyacrylamide, polymethacrylamide, polyvinyl butyral, polyethylene glycol, polyethylene glycol ester, or proteins such as cellulose derivatives,
Natural substances such as starch, polysaccharides such as gum arabic and the like can be mentioned. These range from 0 to 85%, preferably from 0 to 70%
% may be contained.

Note that the vinyl pyrrolidone polymer may be a crosslinked polymer, but in this case, it is preferable to crosslink it after coating it on the support (including the case where the crosslinking reaction progresses by leaving it to stand).

The amount of binder used is usually 0.05 (1 to 50 (l) per layer per 1 f of support, preferably 0.1
g to 10 g.

In addition, the binder is 0.1
~10(l) is preferably used, more preferably 0.
It is 25-4g.

The support used in the heat-developable photosensitive material of the present invention includes:
For example, polyethylene film, cellulose acetate film and polyethylene terephthalate film, synthetic plastic films such as polyvinyl chloride, paper supports such as photographic base paper, printing paper, baryta paper and resin-coated paper, and electronic coatings on these supports. Examples include a support coated with a line-curable resin composition and cured.

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. The thermal solvent used in the present invention is a compound that promotes thermal development and/or thermal transfer. Regarding these compounds, for example, U.S. Patent No. 3.347.675, U.S. Pat.
556, Japanese Patent Application No. 59-47787, etc., and those particularly useful in the present invention include, for example, urea derivatives (e.g., dimethylurea, di1delurea, phenylurea). ), amide derivatives (e.g., acetamide, benzamide, etc.)
, polyhydric alcohols (for example, 1,5-bentanediol, 1,6-bentanediol, 1,2-cyclohexanediol, pentaerythritol, trimethylolethane, etc.), or polyethylene glycols.

Among the above thermal solvents, water-insoluble solid thermal solvents described below are more preferably used.

A water-insoluble solid thermal solvent is a compound that is solid at room temperature but becomes liquid at high temperatures (60°C or higher, preferably 100°C or higher, particularly preferably 130°C or higher and 250°C or lower), and is an inorganic/organic compound. (“Organic Conceptual Diagram” by Yoshio Koda,
Sankyo Shuppan ■, 1984) is in the range of 0.5 to 3.0, preferably 0.7 to 2.5, particularly preferably 1.0 to 2.0, and is The solubility in
Refers to smaller compounds.

Specific examples of water-insoluble solid thermal solvents are shown below, but the invention is not limited thereto.

Exemplary water-insoluble solid hot solvent Melting point (°C) Inorganic/Organic C(Cfl)3CONH214F 1.44
Melting point (“C) Inorganic/organic Cl 13 C0NH-C)-C←N1(COCH32
90° or more 1,34acH2CONH2] 5
6° 1.340-CONHs) 166° 0.88 CH30<IΣCONH2164~16Ashi 1.47 Melting point (°C) Inorganic/Organic melting point (°C) Inorganic/Organic○-8O2NHK3 11.0' 1.13C
City Q902 NlIC Mountain Group (8O2<Koto CHs
16B° 1.59 Many compounds used as water-insoluble solid heat solvents are commercially available, and can be easily synthesized by those skilled in the art.

The method of adding the water-insoluble hot solvent is not particularly limited, but it may be added by grinding and dispersing it using a ball mill, sand mill, etc.
There are methods such as adding it after dissolving it in a suitable solvent, and adding it as an oil-in-water dispersion after dissolving it in a boiling point solvent.
It is preferable to pulverize and disperse the solid particles using a ball mill, sand mill, etc. and add them while maintaining the solid particle shape.

Layers to which the water-insoluble solid thermal 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, and the like, so that the respective effects can be obtained.

The amount of the water-insoluble heat solvent added is usually 10% to 500% by weight, preferably 50% to 300% by weight of the binder.

Incidentally, even when the melting point of the water-insoluble solid thermal solvent of the present invention is higher than the thermal development temperature, the melting point is lowered by being added to the binder, so that it can be effectively used as a thermal solvent.

In addition to the above-mentioned components, the heat-developable photosensitive material of the present invention can contain various additives as required.

For example, ate1 described in U.S. Pat. No. 3,438,776.
~Mel i of amides, succinimides, etc.~) A-mer, US Pat.
Compounds such as polyalkylene glycols described in No. 5,
100-1-3 described in U.S. Patent No. 3,667.959
O2-1-8 The melting point of rough 1-on, etc., which is on the right of the 0- group is 20
These include non-aqueous polar organic compounds.

Furthermore, the pencil 1 non derivatives described in JP-A-49-115540, JP-A-1R53-24829, JP-A-53-24829;
Nol-Nor M conductor described in March 3-6022, carboxylic acids described in JP-A-58-118640, polyhydric alcohols described in JP-A-58-198038, JP-A-59- Also included are sulfamoylamide compounds described in No. 84236.

In addition, a color toning agent known in the art may be added as a development accelerator to the heat developable photosensitive material of the present invention.
-492August, 46-6077@, 49-5019
No. 49-5020, No. 49-91215, No. 49-107727, No. 50-2524, No. 50-67132, No. 50-67641, No. 5
0-114217M, 52-33722, 52-
No. 99813, No. 53-1020, No. 53-551
No. 15, No. 53-76020, No. 53-125014
No. 54-156523, No. 54-156524, No. 54-156525, No. 54-156526
No. 55-4060, No. 55-4061, No. 55
Publications such as -32015 and West German Patent No. 2.140
．． No. 406, No. 2.141゜063, No. 2.220
．． 618, U.S. Patent No. 3,847,612, U.S. Patent No. 3
, 782,941, 4,201,582, and the specifications of JP-A-57-207244, JP-A-57-207245, JP-A-58-189628, JP-A-58-193541, etc. The compounds phthalazinone, phthalimide, pyrazolone, quinazolinone, N-hydroxynaphthalimide, benzoxazine, naphthoxazinedione, 2,3-dihydro-phthalazinedione,
2,3-dihydro-1,3-oxazine-2,4-dione, oxypyridine, aminopyridine, hydroxyquinoline, aminoquinoline, isocarbostyryl, sulfonamide, 2H-1,3-bendithiazine-2,4-( 3
H) dione, benzotriazine, mercaptotriazole, dimercaptotetrazabentalene, aminomercaptotriazole, acylaminomercaptotriazole, phthalic acid, naphthalic acid, phthalamic acid, etc.
A mixture of one or more of these and an imidazole compound, a mixture of at least one acid or acid anhydride such as phthalic acid or naphthalic acid, or a phthalazine compound, furthermore, a mixture of phthalazine and maleic acid, itaconic acid, or quinoline. Examples include combinations of acids, gentisic acid, and the like.

Antifoggants include, for example, U.S. Pat. No. 3,645;
Higher aliphatic compounds (e.g. behenic acid, stearic acid, etc.) described in No. 739, mercuric salts described in Japanese Patent Publication No. 11113/1983, and N-
Halogen compounds (e.g. N-halogenoacetamide, N
-halogenosuccinimide, etc.), U.S. Patent No. 3.700
．． 457, mercapto compound-releasing compounds described in JP-A No. 51-50725, arylsulfonic acids (e.g. benzenesulfonic acid, etc.) described in JP-A No. 49-125016, lithium carboxylic acid salts described in JP-A No. 51-47419. (e.g. lithium laurate), British Patent No. 1,45
5,271, oxidizing agents (e.g. perchlorates, inorganic peroxides, persulfates, etc.) described in JP-A-50-101,019, sulfinic acids or thiosulfonic acids described in JP-A-53-19825. , 2 described in No. 51-3223
-Thiouracils, simple sulfur described in No. 51-26019, disulfide and polysulfide compounds described in No. 51-42529, No. 51-81124, and No. 55-93149, rosin described in No. 51-57435, or Diterpenes (e.g. abietic acid, pimaric acid, etc.), polymeric acids having free carboxyl groups or sulfonic acid groups as described in US Pat. No. 51-104338, thiazolinthione as described in US Pat. No. 54-51821, U.S. Patent No. 4.137
．． 1,2,4-triazole or 5-mercapto-1,2,4-triazole described in No. 079, No. 55-
Thiosulfinate esters described in No. 140833,
1,2,3,4-thiatriazoles described in No. 55-142331, No. 59-46641, No. 59-57
No. 233, dihalogen compounds or trihalogen compounds described in No. 59-57234, Zarani No. 59-11
Examples include thiol compounds described in No. 1636.

In addition, as other antifoggants, Japanese Patent Application No. 59-565
Hydroquinone derivatives described in No. 06 (e.g., di-t
-octylhydroquinone, dodecanylhydroquinone, etc.) or hydroquinone derivatives described in Japanese Patent Application No. 59-66380, and benzotriazole derivatives (e.g., 4-sulfobenzotriazole, 5-carboxybenzotriazole, etc.) are preferably used in combination. can.

As a silver image stabilizer, U.S. Patent No. 3.707.37
7 @ Two polyhalogenated organic oxidizing agents (e.g., tetrabromobutane, tribromoquinaridine, etc.) in the specification, 5-methoxycarbonylthio-1-phenyltetrazole described in Belgian Patent No. 768,071 , monohen compounds (for example, 2-bromo-2-tolylsulfonylacetamide, etc.) described in JP-A No. 50-119624, bromine compounds (such as 2-bromo-2-tolylsulfonylacetamide, etc.) described in JP-A-50-120328
Examples include 2-bromomethylsulfonylbenzothiazole, 2,4-bis(tribromomethyl)-6-methyltriazine, etc.), and tribromoethanol described in JP-A-53-46020. Also, Japanese Patent Application Publication No. 1973-
Various monohalogenated organic antifoggants for silver halide emulsions, such as those described in No. 119624, can be used.

Other image stabilizers include U.S. Pat. No. 3,220;
No. 846, No. 4,082,555, No. 4,088,4
No. 96, JP-A No. 50-22625, Research Disclosure (RD) No. 12021, No. 1516
No. 8, No. 15567, No. 15732, No. 157
Compounds called activator precursors that release basic substances by heat, such as compounds such as guanidinium trichloroacetate that release bases by decarboxylation with heat, as described in No. 33, No. 15734, No. 15776, etc., and galactonamide. Compounds such as aldnamide compounds, amine imides, 2-carboxycarboxamides, etc., as well as JP-A-56-130745 and JP-A-56-130745.
- Sodium phosphate base generator described in No. 132332, compound generating amine by intramolecular nucleophilic reaction described in British Patent No. 2,079,480, JP-A-59
Aldoxime carbamates described in No.-157637, hydroxamic acid carbamates etc. described in No. 59-166943, and No. 59-180537, No. 5
Examples include base release agents described in No. 9-174830 and No. 59-195237.

Furthermore, U.S. Patent Nos. 3,301, 678 and 3,50
No. 6,444, No. 3,824,103, No. 3.84
Iridium-based compounds, S-rubamoyl derivatives of mercapto-containing compounds, and nitrogen-containing heterocyclic compounds described in No. 4.788, RD12035, and RD18016 may be used for the purpose of stabilizing images; is the activator stabilizer described in U.S. Patent No. 3,669,670, U.S. Pat. Nitrogen-containing organic bases called activator stabilizer precursors, such as α-sulfonylacetate or trichloroacetate of 2-aminothiazoline, acylhydrazine compounds, etc., are used for the purpose of accelerating development and for stabilizing images. I can do it.

Also, for example, JP-A-56-130745 and JP-A-59-2
Development may be carried out in the presence of a small amount of water as described in U.S. Pat. 3,
312,550 and the like, development may be carried out using hot steam, hot air containing moisture, or the like. Also, compounds that release water into heat-developable photosensitive materials, such as Japanese Patent Publication No. 44-26
Compounds containing water of crystallization such as those described in No. 582, such as sodium phosphate dodecahydrate and ammonium alum diquadrate, may be incorporated into the photothermographic material.

In addition, various additives such as antihalation dyes, optical brighteners, hardeners, antistatic agents, plasticizers, and spreading agents, coating aids, and the like may be used.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or a non-photosensitive layer (for example,
Colloidal silica can be used for the undercoat layer, intermediate layer, protective layer, etc.).

The colloidal silica used in the present invention is a colloidal solution of silicic anhydride with an average particle size of 3 to 120 mμ mainly using water as a dispersion medium, and the main component is 5iO2 (silicon dioxide).
It is. Regarding colloidal silica, for example, JP-A-56-109336, JP-A-53-123916, JP-A-5
It is described in No. 3-112732, No. 53-100226, etc. The amount of colloidal silica used is 0.05 to 0.05 to the binder of the layer to be mixed and coated in terms of dry weight ratio.
A range of 2.0 is preferred.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or a non-photosensitive layer (for example,
An organic fluoro compound can be used for the undercoat layer, intermediate layer, protective layer, etc.).

Regarding the organic fluoro compounds used in the present invention, US Pat.
No. 3,754,924, No. 3,775,126, No. 3,850,640, West German Patent Publication No. 1,942
, No. 665, No. 1,961,638, No. 2,124,
No. 262, British Patent No. 1,330,356, Belgian Patent No. 742,680, and JP-A-46-7781, No. 48-9715, No. 49-46733, No. 49
-133023, 50-99529, 50-1
No. 1322, No. 50-160034, No. 51-431
No. 31, No. 51-129229, No. 51-10641
No. 9, No. 53-84712, No. 54-111330
No. 56-109336, No. 59-30536, No. 59-45441, and compounds described in Japanese Patent Publications No. 47-9303, No. 48-43130, No. 59-5887, etc. can be preferably used.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or
Alternatively, an antistatic agent can be used in a non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.).

As the antistatic agent used in the present invention, British Patent No. 1
, No. 466.600, Research Disclosure t-
(Research [) 1 closure)
No. 15840, No. 16258, No. 16630, U.S. Patent No. 2,327,828, U.S. Patent No. 2,861,056
No. 3.206.312, No. 3,245,833, No. 3.428.451, No. 3.775.126,
3.963.498, 4,025,342,
4.025□463, 4.025,691,
Compounds described in 4,025.704 etc. are mentioned,
These can be preferably used.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or
Alternatively, an ultraviolet absorber can be used in a non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.).

Examples of the ultraviolet absorber used in the present invention include benzophenone compounds (for example, those described in JP-A-46-2784, U.S. Pat. No. 3,215,530, and U.S. Pat. No. 3,698,907), butadiene compounds [for example , U.S. Patent No. 4
, 045,229), 4-thiazolidone compounds (e.g., those described in U.S. Pat. No. 3.314□794 and U.S. Pat. No. 3.352,681), benzotriazole compounds substituted with an aryl group (For example, special public relations
-10466, 41-1687, 42-26
No. 187, No. 44-29620, No. 48-41572
No., JP-A-54-95233, JP-A No. 57-142975
No. 3,253.921, U.S. Patent No. 33533,
No. 794, No. 3,754,919, No. 3.794
．． No. 493, No. 4.009,038, No. 4,220
．． No. 711, No. 4,323,633, Research Disclosure
re) 22519], benzoxidol compounds (e.g., U.S. Pat. No. 3,700.45)
5), cinnamate ester compounds (e.g., U.S. Pat. No. 3,705,805, U.S. Pat. No. 3,707,3)
No. 15 and JP-A No. 52-49029). Additionally, U.S. Patent No. 3.499.7
62 and JP-A-54-48535 can also be used. UV-absorbing couplers (e.g. α
- Naphthol-based cyan dye-forming couplers) and ultraviolet-absorbing polymers (e.g., JP-A-58-111942
No. 178351, No. 181041, No. 59-1
9945@, No. 23344, and those described in the official gazette).

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or
Alternatively, a hardening agent can be used in a non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.).

Hardening agents used in the present invention include aldehyde-based and aziridine-based hardeners (for example, PB Report 19,921, U.S. Patent No. 2,950.197, U.S. Patent No. 2,964,404).
No. 2,983,611, No. 3,271,17
Specifications of No. 5, Japanese Patent Publication No. 46-40898, Japanese Patent Application Publication No. 1973
No. 0-91315), isoxazole-based (e.g., those described in U.S. Pat. No. 331,609), epoxy-based (e.g., U.S. Pat. No. 3,0-91315),
47,394, West German Patent No. 1,085,663, British Patent No. 1,033,518, Japanese Patent Publication No. 1973
-35495), vinyl sulfone type (e.g. PB Report 19,920, West German Patent No. 1)
, No. 100,942, No. 2,337,412, No. 2,
No. 545,722, No. 2,635,518, No. 2,7
No. 42,308, No. 2,749,260, British Patent No. 1,251,091, Japanese Patent Application No. 45-54236, Japanese Patent Application No. 48-110996, U.S. Patent No. 3,539.644
No. 3,490,911), acryloyl groups (for example, Japanese Patent Application No. 1983-27949)
No. 2, U.S. Pat. No. 3,640,720), carbodiimides (e.g., U.S. Pat.
No. 938,892, No. 4,043,818, No. 4,0
61.499, Japanese Patent Publication No. 46-38715, and Japanese Patent Application No. 15095/1982)
, triazine series (e.g. West German Patent No. 2,410,97
No. 3, No. 2,553.915, U.S. Patent No. 3,325
, 287, and those described in JP-A-52-12722), other maleimide-based, acetylene-based,
Methanesulfonic acid ester hardeners and N-methylol hardeners can be used alone or in combination. Useful combination techniques include, for example, West German Patent No. 2.447.587, West German Patent No. 2.505.746, West German Patent No. 2.514,245,
U.S. Patent No. 4.047.957, U.S. Patent No. 3.832.18
Specifications of No. 1 and No. 3,840,370, JP-A-1978
-43319, 50-63062, 52-12
Examples include combinations described in Japanese Patent Publication No. 7329 and Japanese Patent Publication No. 48-32364.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or
Alternatively, a polymer hardener can be used in a non-photosensitive layer (for example, an undercoat layer, an intermediate layer, a protective layer, etc.).

Examples of the polymeric hardener used in the present invention include polymers having aldehyde groups (e.g., acrolein copolymers, etc.) described in U.S. Pat. No. 3,396,029.
, U.S. Pat. No. 3,362,827, Research Disclosure No. 17333 (1978), etc., polymers having a dichlorotriazine group, and U.S. Pat. No. 3,623.
, 878, Lizard Disclosure No. 16725 (1978)
, U.S. Patent No. 4,161,407, Japanese Patent Publication No. 54-65
Examples thereof include polymers having an active vinyl group or a group that can be a precursor thereof, as described in JP-A-56-142524, and polymers having an active ester group as described in JP-A-56-66841.

In the heat-developable photosensitive material of the present invention, a polymer latex is used in the heat-developable photosensitive layer and/or the non-photosensitive layer (e.g., undercoat layer, intermediate layer, protective layer, etc.) for the purpose of improving the physical properties of the film. be able to.

Preferred specific examples of the polymer latex used in the present invention include polymethyl acrylate, polymethyl acrylate, polyrope tyl acrylate, copolymer of ethyl acrylate and acrylic acid, copolymer of vinylidene chloride and butyl acrylate, and copolymer of butyl acrylate and acrylic acid. , a single polymer of vinyl acetate and butyl acrylate, a copolymer of vinyl acetate and ethyl acrylate, a copolymer of ethyl acrylate and 2-acrylamide, and the like.

The preferred average particle size of the polymer latex is 0.02μ1
It is 1 to 0.2 μm. The amount of polymer latex used is 0.0,
03 to 0.5 is preferred.

In the heat-developable photosensitive material of the present invention, various surfactants are added to the heat-developable photosensitive layer and/or non-photosensitive layer (e.g., undercoat layer, intermediate layer, protective layer, etc.) for the purpose of improving coating properties. Agents can be used.

The surfactant used in the present invention may be any of anionic, cationic, amphoteric and nonionic surfactants.

Examples of anionic surfactants include alkyl carboxylates, alkyl sulfonates, alkylbenzenesulfonates, alkylnaphthalenesulfonates, alkyl sulfates, alkyl phosphates, N
-carboxy groups, sulfo groups, such as acyl-N-alkyl taurines, sulfosuccinates, sulfoalkyl polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl phosphates, etc.
Phospho group, 1alS! Those containing acidic groups such as ester groups and phosphoric acid ester groups are preferred.

Examples of cationic surfactants include alkylamine salts, aliphatic or aromatic quaternary ammonium salts,
Heterocyclic quaternary ammonium salts such as pyridinium and imidazolium, and phosphonium or sulfonium salts containing aliphatic or heterocyclic rings are preferred.

Preferred examples of the amphoteric surfactant include amino acids, aminoalkyl sulfonic acids, aminoalkyl sulfates or phosphoric esters, alkyl betaines, and amine oxides.

Examples of nonionic surfactants include saponin (steroid type), alkylene oxide derivatives (such as polyethylene glycol, polyethylene glycol/polypropylene glycol condensates, polyethylene glycol alkyl ethers or polyethylene glycol alkylaryl ethers, polyethylene glycol esters, polyethylene glycol sorbitan esters,
polyalkylene glycol alkylamines or amides, polyethylene oxide adducts of silicone),
Preferred are glycidol derivatives (eg, alkenylsuccinic acid polyglycerides, alkylphenol polyglycerides), fatty acid esters of polyhydric alcohols, alkyl esters of sugars, and the like.

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or a non-photosensitive layer (for example, an undercoat layer, an intermediate layer, etc.) for the purpose of improving developability, improving image dye transferability, improving optical properties, etc. ,
(protective layer, etc.) may contain non-photosensitive silver halide grains.

The non-photosensitive silver halide grains used in the present invention may have any silver halide composition such as silver chloride, silver bromide, silver iodide, silver iodobromide, silver chlorobromide, silver chloroiodobromide, etc. Can be used. The preferred grain size of the non-photosensitive silver halide grains is about 0.
．． It is 3 μm or less.

In addition, "Addition" means 0.00% in terms of silver amount for the layer to be added.
The range of 02 to 3 (1/n' is preferable).

The heat-developable photosensitive material of the present invention includes a heat-developable photosensitive layer and/or a non-photosensitive layer (lower I'l layer) for the purpose of improving film properties.
(L intermediate layer, protective layer, etc.), for example, 1Z#Masho 51-10
4338) may contain vinyl polymers containing norboxyl or sulfo groups.

The amount of the vinyl polymer used is preferably in the range of 0.05 to 2.0 in terms of dry weight ratio to the binder of the layer to which it is added.

The heat-developable photosensitive material of the present invention basically contains (1) photosensitive silver halide, (2) reducing agent, (3) dye-providing substance, and (4) binder in one heat-developable photosensitive layer of GEL. It is preferable to contain (5) an organic silver salt as necessary. However, these do not necessarily need to be contained in a single photographic constituent layer; for example, if the heat-developable photosensitive layer is divided into two layers, )
The components of one side of the heat-developable photosensitive f! If the dye-providing substance (3) is contained in the L layer and the dye-providing substance (3) is contained in the other layer adjacent to this photosensitive layer, etc., it can be contained separately in two or more constituent layers as long as they are in a state where they can react with each other. Good too.

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

The heat-developable photosensitive material of the present invention has one or more heat-developable photosensitive layers on a support. In the case of color, it generally 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.

Typically, a yellow dye is used in the blue-sensitive layer, a magenta dye is used in the green-sensitive layer, and a cyan dye is used in the red-sensitive layer, but the 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 the support, or a structure in which a blue-sensitive layer is sequentially formed on the support. layer, a green-sensitive layer, a red-sensitive layer, or sequentially on a support,
There are configurations such as a green photosensitive layer, a red photosensitive layer, and a blue photosensitive layer.

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.

Namely, dip method, roller method, reverse roll method, air knife method, doctor blade method, spray method,
There are methods and apparatuses for the bead method, extrusion method, stretch method, curtain method, etc.

The heat-developable photosensitive material of the present invention is preferably provided with a protective layer. Hereinafter, this will be referred to as the protective layer of the present invention.

Various additives used in the photographic field can be used in the protective layer of the present invention. These additives include various matting agents, colloidal silica, slip agents, organic fluoro compounds (especially fluorosurfactants), antistatic agents, ultraviolet absorbers, high-boiling organic solvents, antioxidants, hydroquinone derivatives, and polymers. Examples include latex, surfactants (including polymeric surfactants), hardeners (including polymeric hardeners), organic silver salt particles, non-photosensitive silver halide particles, and the like.

The matting agent used in the protective layer of the present invention is fine particles of inorganic or organic substances that are incorporated into the photothermographic material to increase the roughness of the surface of the photosensitive material and make it matte. be.

Methods of using matting agents to prevent adhesion that occurs during manufacturing, storage, and use of photosensitive materials, and to prevent static electricity caused by contact, friction, and peeling between materials of the same or different types are known in the art. It is well known. Specific examples of matting agents include silicon dioxide described in JP-A-50-46316, JP-A-53-7231, JP-A-58-66937,
Alkali-soluble matting agents such as alkyl methacrylate/methacrylic acid copolymers described in JP-A No. 60-8894, alkali-soluble polymers having anionic groups described in JP-A-58-166341, JP-A-58-145935 A combination of two or more types of fine particle powders with different Mohs hardnesses, a combination of oil droplets and fine particle powders as described in JP-A-58-147734, two types with different average particle sizes as described in JP-A-59-149356 Combination of the above spherical matting agents, JP-A-56-4
The combination of a fluorinated surfactant and a matting agent described in No. 4411, British Patent No. 1,055.713, U.S. Pat. No. 1,939,213, U.S. Pat. No. 2,221,873,
No. 2,268,662, No. 2,322,037, No. 2.376,005, No. 2,391,181,
2.701.245, 2.992,101,
No. 3,079,257, No. 3,262,782, No. 3,443,946, No. 3,516,832,
3.539.344, 3.591.379, 3.754.924, 3.767.448, JP-A-49-106821, JP-A-57-14835, etc. organic matting agent, West German i 2,529,3
No. 21, British Patent No. 760.775, 1, 260
．． No. 772, U.S. Patent No. 1,201,905, U.S. Patent No. 2,
No. 192,241, No. 3.053,662, No. 3,
No. 062,649, No. 3,257,206, No. 3,
No. 322,555, No. 3,353,958, No. 3.3
No. 70.951, No. 3,411,907, No. 3.43
No. 7.484, No. 3,523.022, No. 3,61
No. 5,554, No. 3,635,714, No. 3.76
No. 9,020, No. 4,021,245, No. 4,0
Inorganic matting agents described in JP-A No. 29,504, etc., or JP-A Nos. 46-7781 and 49-10682.
No. 1, No. 51-6017, No. 53-116143, No. 53-100226, No. 57-14835, No. 57-82832, No. 53-70426, No. 59
Matting agents having physical properties such as those described in Japanese Patent Publication No. 149357, Japanese Patent Publication No. 57-9053, and EP-107,378 are preferably used.

In the protective layer of the present invention, the amount of the matting agent added is preferably 10ti (1/2.0g, more preferably 20mg to 1.0g) per 112. The particle size of the matting agent is 0.
5-10 μm is preferable, more preferably 1.0-57
It is 1m.

The matting agents may be used in combination of two or more.

Examples of the slippery agent used in the protective layer of the present invention include solid paraffin, oils and fats, surfactants, natural waxes, synthetic waxes, etc. Specifically, French Patent No. 2.1
80.465, British Patent No. 955.061, 1,
No. 143,118, No. 1,270,578, No. 1,
No. 320.564, No. 1,320,757, JP-A-4
No. 9-5017, No. 51-141623, No. 54-1
No. 59221, No. 56-81841, Research Disclosure (Research Disclosure)
e) 13969, U.S. Patent No. 1,263,72
No. 2, No. 2.588.765, No. 2,739,891
No. 3,018.178, No. 3,042,522
No. 3,080,317, No. 3.082,087
No. 3,121,060, No. 3,222,17
No. 8, No. 3,295,979, No. 3,489,567
No. 3,516,832, No. 3,658,573, No. 3,679,411, No. 3,870.521, etc. can be preferably used.

The protective layer of the present invention contains a high boiling point organic solvent (for example, U.S. Pat. No. 2,322,027, U.S. Pat.
No. 533,514, No. 2,882,157, Special Publication No. 4
No. 6-23233, British Patent No. 958.441, 1
, 222,753, U.S. Patent No. 2.353.262, U.S. Patent No. 3,676,142, U.S. Patent No. 3,700,454
Esters (e.g. phthalates, phosphoric esters, fatty acid esters, etc.), amides (e.g. fatty acid amides, (sulfonic acid amide, etc.), ethers, alcohols, paraffins, etc. ) may contain oil droplets in which a water-insoluble oil compound is emulsified and dispersed. Furthermore, these oil droplets may contain photographic additives for various purposes.

Binders used in the protective layer of the present invention include polyvinyl butyral, polyvinyl acetate, ethyl cellulose, polymethyl methacrylate, cellulose acetate butyrate, polyvinyl alcohol, polyvinyl pyrrolidone, polyethyl oxazoline, polyacrylamide,
One or more synthetic or natural polymeric substances such as gelatin and phthalated gelatin can be used in combination.

In particular, gelatin (including gelatin derivatives), polyvinylpyrrolidone (molecular weight preferably 1,000 to 400,000), polyvinyl alcohol (molecular weight i, ooo to 1
00,000) and polyoxazoline (molecular weight preferably 1,000 to 800,000) alone or in combination of two or more of these are preferred, and gelatin alone or gelatin and the above polyvinylpyrrolidone, polyvinyl alcohol and polyoxazoline are preferred. Particularly preferred are binders that use hydrophilic polymers that are highly compatible with gelatin, such as the following. Gelatin is obtained by lime treatment,
The gelatin may be obtained by acid treatment or ion exchange treatment, or may be ossein gelatin, big skin gelatin, hydrogelatin, or modified gelatin obtained by esterifying these gelatins, fluorinated gelatin, or the like.

The thickness of the protective layer of the present invention is preferably 0.05 to 5 μm, more preferably 0.1 to 1.0 μm. The protective layer may be a single layer or may be composed of two or more layers.

Further, in order to increase the film strength and prevent film destruction, it is also preferable that the hardness of the protective layer is set to be much higher than that of the photosensitive layer. One way to make the hardness of the protective layer higher than that of the photosensitive layer, that is, to control the hardness of each layer, is to use a diffusion-resistant hardener. By using it in the protective layer, only the hardness of the protective layer can be made greater than that of the photosensitive layer.

Polymer hardeners are known as diffusion-resistant hardeners, such as those disclosed in U.S. Pat. Nos. 3,057.723 and 3.39.
No. 6.029, No. 4.161.407, JP-A-58-
Hardeners described in No. 50528 and the like can be used.

Another way to control the degree of dura for each layer is to
A diffusible hardener (for example, a vinyl sulfone hardener) is contained only in the protective layer, or the content of the protective layer is higher than that of the photosensitive layer, and after simultaneous multilayer coating, rapid drying is performed.J: The degree of hardness of the protective layer can be greater than that of the photosensitive layer.

The heat-developable photosensitive material of the present invention usually has a temperature of 80°C to 20°C after imagewise exposure.
at a temperature range of 0°C, preferably 100°C to 170°C,
It is developed by simply heating for 1 second to 180°C, preferably 1.5 seconds to 120 seconds. Transfer of the diffusible dye to the image-receiving layer may be carried out simultaneously with thermal development by bringing the image-receiving member into close contact with the photosensitive surface of the photosensitive material and the image-receiving layer during thermal imaging, or by bringing the image-receiving member into close contact with the image-receiving member after thermal development and heating. Alternatively, it may be transferred by supplying water and then applying heat if necessary. Also, before exposure,
Preheating may be performed in the temperature range of °C. Also, JP-A-6
As described in Japanese Patent Application No. 0-143338 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 to improve mutual adhesion. It's okay.

Various exposure means can be used for the photothermographic material according to the present invention. The latent image is obtained by imagewise exposure to radiation, including visible light. Generally, light sources used for ordinary color printing, such as tungsten lamps, mercury lamps, xenon lamps, laser beams, CRT beams, etc., can be used as the light source.

As the heating means, any method applicable 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. There are no particular restrictions on the heating pattern, including methods of preheating (breheating) and then reheating, heating at a high temperature for a short time, or at a low temperature for a long time, continuously increasing, decreasing, or repeating, and even discontinuously. Although heating is possible,
A simple pattern is preferred. Alternatively, a method in which exposure and heating proceed simultaneously may be used.

The image-receiving layer of the image-receiving member that can be effectively used in the present invention includes:
It is sufficient that it has the function of receiving the dye in the heat-developable photosensitive layer released or formed by heat development, for example, a polymer contained in a tertiary amine or a quaternary ammonium salt, as described in US Pat.
．． Those described in No. 709.690 are preferably used. For example, as a polymer containing an ammonium salt, the ratio of polystyrene-N,N,N-tri-0-hexyl-N-vinyl-benzylammonium chloride is 1:4 to 4:1, preferably 1:1. be.

Examples of polymers containing tertiary amines include polyvinylpyridine. 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-57-2072.
The glass transition temperature described in No. 50 etc. is 40°C or higher, 2
Examples include those formed of organic polymeric substances that are heat resistant to 50° C. or lower.

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 organic polymer substances include polystyrene, polyethylene derivatives having a substituent having 4 or less carbon atoms, polyvinylcyclohexane, polydivinylbenzene,
Polyacetals such as polyvinylpyrrolidone, polyvinylcarbazole, polyallylbenzene, polyvinyl alcohol, polyvinyl small lumal and polyvinyl butyral, polyvinyl chloride, chlorinated polyethylene, polytrichloride fluoroethylene, polyacrytolyl, polyN, N- Dimethylallylamide, polyacrylate with p-cyanophenyl group, pentachlorophenyl group and 2,4-dichlorophenyl group, polyacrylchloroacrylate, polymethyl methacrylate, polyethyl methacrylate, polypropyl methacrylate, polyisopropyl methacrylate, polyisobutyl methacrylate , polytert-butyl methacrylate-1-, polycyclohexyl methacrylate, polyethylene glycol dimethacrylate, poly-2-cyano-ethyl methacrylate, polyesters such as polyethylene terephthalate, polycarbonates such as polysulfone, hisphenol A polycarbonate, polyan Mention may be made of hydrides, polyamides and hirulose acetates.

In addition, Polymer Handbook Second Edition (
John Wiley and Sons (polyme)
r) landbook 2nd ed, (J,
8randrup, E.

■, edited by lmmergut> John W 1
Also useful are synthetic polymers with a glass transition temperature of 40° C. or less, as described in the publication by John Ley & Sons. Generally, the molecular weight of the polymer substance is 2,000 to 200.
．． 000 is useful. These polymeric substances may be used alone or in a blend of two or more types, or may be used in combination of two or more types as a copolymer.

Useful polymers include cellulose acetates such as triacetate and diacetate, polyamides in combinations such as heptamethylene diamine and terephthalic acid, fluorene propylamine and adipic acid, hexamethylene diamine and diphenic acid, hexamethylene diamine and isophthalic acid, and diethylene glycol. Examples include polyester, polyethylene terephthalate, and polycarbonate made of a combination of bis-p-carboxyphenoxybutane, ethylene glycol, and diphenylcarbonate.

These polymers may be modified. For example, cyclohexane dimetatool, isophthalic acid,
Polyethylene terephthalate using methoxypolyethylene glycol, 1,2-dicarbomethoxy-4=benzenesulfonic acid, or the like as a modifier is also effective.

A particularly preferable image-receiving layer is JP-A-59-22342
Layer made of polyvinyl chloride described in No. 5 and JP-A-60
Examples include a layer made of polycarbonate and a plasticizer described in Japanese Patent No. 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, transparent supports, opaque supports, etc. may be used, and examples thereof include films of polyethylene terephthalate, polycarbonate, polystyrene, polyvinyl chloride, polyethylene, polypropylene, etc. Supports containing pigments such as titanium oxide, barium sulfate, calcium carbonate, and talc, baryta paper, RC paper laminated with thermoplastic resin containing pigments on paper, fabrics, glasses, A support made of metal such as aluminum, or a support made by coating and curing an electron beam curable resin composition containing a pigment on these supports, and a coating layer containing a pigment provided on these supports. Examples include supports such as

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

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

The image-receiving layer of the image-receiving member can also be formed into a type that can be peeled off from the heat-developable photosensitive layer. For example, after imagewise exposure of a heat-developable color photosensitive material, an image-receiving layer can be superimposed on the heat-developable photosensitive layer and uniformly heat-developed. Further, after imagewise exposure and uniform heat development of the heat-developable color light-sensitive material, an image-receiving layer may be superimposed and heated at a temperature lower than the development temperature to transfer the dye image released or formed from the dye-providing substance.

[Effect of the invention] By adding the development inhibitor in microcapsules, the maximum density of the obtained image is high, and the minimum
A heat-developable photosensitive material with a so-called high image contrast, that is, a low 1 degree, was obtained. Furthermore, even if the heat-developable photosensitive material of the present invention is stored unused for a long period of time, the contrast of images obtained from it does not deteriorate;
It is possible to obtain products with excellent shelf life.

[Examples] Specific examples of the present invention will be described in detail below, but the present invention is not limited to these embodiments.

Example-1 <Preparation of Microcapsule 1> Dissolve 12,0(l) of sulfosuccinic acid histo-2-ethylhexyl ester sodium salt and e,og of polyoxydilene-4-lauryl ether in 80-l of n-hexane. Exemplary compound A- in 80ml of distilled water
Slowly add a solution containing 42.5 g and stir thoroughly.

The mixed solution is transferred to a cylindrical double-walled reaction vessel. Then, while stirring well, add 0.05 (l) of ethylene glycol dimethacrylate and 5 g of methyl methacrylate, and further add and dissolve 1 mo of sodium riboflavin-5'-phosphate and potassium persulfate. Then, while stirring gently, 7~ at a temperature of 35±5℃ under nitrogen atmosphere
Light is irradiated for 10 hours until the monomer disappears. N-hexane is distilled off from the resulting microcapsule suspension under reduced pressure, water is then added, the surfactant is removed by ultrafiltration, and the microcapsules are isolated by centrifugation.

The size of the obtained microcapsule particles is 100-30
It was 0 nm. This microcapsule will be referred to as microcapsule 1.

<Preparation of Microcapsule 2> Microcapsules were obtained in the same manner as in the preparation of Microcapsule 1 except that A-3 was used instead of A-4. This will be referred to as microcapsule 2.

<Creation of microcapsule 3> In the creation of microcapsule 1, use A instead of A-4.
A microphone [] capsule was obtained in the same manner except that -23 was used. This will be referred to as microcapsule 3.

Preparation of Microcapsules 4> Add 2.5 g of Exemplified Compound A-44 to 8 (l) of distilled water, and further add 80 (J) of glass peas, and then disperse with a sand grinder at 200 rpm for about 4 hours. ,
The resulting dispersion was then dispersed using ultrasonic waves for about 10 minutes. In preparing microcapsules 1, this dispersion was used as A
Microcapsules were obtained in the same manner except that the aqueous solution of -4 was used instead.

The particle size of the obtained microcapsules is 300 to 600nf.
It was il. This will be referred to as microcapsule 4. <Creation of microcapsule 5> In the creation of microcapsule 4, use A instead of A-4.
Microcapsules were obtained in the same manner except that -48 was used. This will be referred to as microcapsule 5.

Preparation of Microcapsule 6> Microcapsules were obtained in the same manner as in the preparation of Microcapsule 1 except that A-14 was used instead of A-/I. This will be referred to as microcapsule 6.

F Preparation of microcapsule dispersion] Microcapsules 1 to 6 prepared in Example 1) 1.0
A microcapsule dispersion liquid was prepared by adding 200 d of a 3.9 wt % aqueous gelatin solution and dispersing with an ultrasonic homogenizer.

Example 2 [Preparation of organic silver salt dispersion] 144 g of 5-methylbenzotriazole silver obtained by reacting 5-methylbenzotriazole and silver nitrate in a water-alcohol mixed solvent, 0.0 g of 5-methylbenzotriazole. 4 (1, 2 of polyvinylpyrrolidone (K-30)
A 0 wt % aqueous solution of 200 mm and 54 mm of water (h12) were dispersed in an alumina ball mill, and the above polyvinylpyrrolidone aqueous solution of 200 mm was added to give a concentration of 1,000 mm.

[Preparation of photosensitive silver halide emulsion 1 Preparation of silver iodobromide emulsion at 50°C, JP-A-57-92523;
Using the mixing and stirring method shown in Japanese Patent Application No. 92524, 20 g of ossein gelatin, 1.0 g of distilled water, and 11.6 g of potassium iodide (11.6 g of potassium iodide) were added to Solution A in which ammonia was dissolved.
Solution B, an aqueous solution containing 130g of potassium bromide, and Solution C, an aqueous solution 500i12 containing 1 mol of silver nitrate and ammonia, were simultaneously added while keeping PA (+ and p8 constant.Furthermore, Solution B) A hexahedral core emulsion with a silver iodide content of 7 mol % and an average grain size of 0.25 μm was prepared by controlling the addition rate of liquid C and C. Next, in the same manner as above, iodide was added. By coating a silver halide shell with a silver content of 1 mol %, it is possible to obtain 16-hedral grains with an average grain size of 0.
A core/shell type silver halide emulsion of 3 μl1 (shell thickness 0.05 μm) was prepared. (The monodispersity was 8%.) The above emulsions were washed with water and desalted to give a yield of 70%.
I got 0d.

Furthermore, a photosensitive silver halide emulsion was prepared using the silver halide prepared above in the following manner.

Preparation of red-sensitive silver iodobromide emulsion The above silver iodobromide emulsion 700i124
-Hydroxy-6-Mediroot 3, 3a, 7 Tetrazaindene 0.4g Gelatin
32g Sodium thioliiiate 10m.

Sensitizing dye below 1% methanol solution 801Q distilled water
1200d sensitizing dye (a
) [Preparation of reducing agent solution] 93.2 () of reducing agent R-11, polyvinylpyrrolidone (K-30) (7) 20 wt % water 1 part 207 u12,
A 5 wtX aqueous solution of the following surfactant (40 mN), water, and a citric acid aqueous solution were used to make 1) H7.0,600d.

(Surfactant) (m, r+=2 or 3) [Preparation of hot solvent dispersion] 430 g of p-toluamide and polyvinylpyrrolidone (
1,410% of a 0 wt % aqueous solution of K-90) was dispersed in a ball mill to obtain a hot solvent dispersion.

[Dye-donor polymer dispersion liquid manufactured by I Co. 105 g of dye-donor polymer PM-5, the following hydroquinone compound 4.0 (], and 300 d of ethyl acetate were mixed and dissolved by heating to form Alkanol XC (manufactured by DuPont). 5
wt% aqueous solution 248d, photographic gelatin 26.401 phenylcarbamoylated gelatin (type 17819P
C, manufactured by Rousslow) 34.6 (J) was mixed with 1,440 ml of gelatin aqueous solution containing J and dispersed with an ultrasonic homogenizer, and after distilling off ethyl acetate, water was added to 1
．． 590i12 to obtain a dispersion.

(Hydroquinone compound) H [Preparation of heat-developable photosensitive material] The following coating solution was applied to a 180 μm thick photographic transparent polyethylene terephthalate film having a subbing layer to a wet film thickness of 114.311 m, dried, and the photosensitive material was prepared. Created. (Sample No. 1) (Coating liquid composition) Organic silver salt dispersion liquid 80.0d red-sensitive silver iodobromide emulsion 38.4d reducing agent liquid
48.0 thermal solvent dispersion
94.8g Dye-donor polymer dispersion 127-Microcapsule dispersion-145
vQ Photographic gelatin 10vt% aqueous solution 30.9. Q Phenylcarbamoylated geladine 1Qwt% aqueous solution 27.7d Correction water 22.0 Hardener solution (
2.5 wt % aqueous solution of sodium 2,4-dichloro-6-hydroxy-8-triazine) 512 in total (however, 1H of the coating liquid was 6.3). ) As a comparative sample, microcapsule dispersion liquid in sample No. 1-
Sample No. 2 was prepared in the same manner as Sample No. 1 except that an aqueous solution of a development inhibitor and gelatin was used instead of Sample No. 1.

Here, the amount of development inhibitor and gelatin applied is determined by trial FIN.
I adjusted it so that it was the same as 0.1.

Furthermore, as a comparative sample, a sample (sample No. 3) was prepared in which only the corresponding gelatin amount was corrected without using any of the microcapsule dispersion-1 applied to sample N011.

[Preparation of image-receiving member] On the other hand, an ethylene chloride solution of polycarbonate (average molecular weight 25,000, L-1250, Hirotsu Kasei) was coated on photographic baryta paper and dried.
．． An image receiving member was made so that the ratio was 0!1/f.

[Evaluation of photographic properties] The heat-developable photosensitive material was exposed to light through a step wedge, and heat-developed together with the image-receiving member at 150°C for 2 minutes. A transferred image was obtained.

In order to evaluate raw storage stability, the same heat-developable photosensitive material as above was left in an atmosphere of 50° C. and 80% relative humidity for 48 hours, and then exposed to light and thermally developed in the same manner. (Forced deterioration test) The maximum density and minimum density of the obtained transferred image and the maximum density and minimum density of the forced deterioration test sample were measured using a Sakura densitometer (PDA).
-65, manufactured by Roku Konishi) and was measured as reflection a degree. The results are shown in Table 1 below.

1 "As is clear from White Table 1, the minimum density of the photothermographic material (Sample 3) without the addition of a development inhibitor is high, and it increases further after raw storage.Also, although the minimum density is increased even after storage with the addition of a development inhibitor. Sample 2, which is not contained in microcapsules, has a low maximum concentration.On the other hand, sample N011 of the present invention, in which the development inhibitor is contained in microcapsules, has a high maximum concentration, and It can be seen that the minimum density is low, that is, the contrast is high.Also, even when a forced deterioration test is performed, there is almost no variation between the maximum density and the minimum density, indicating that it has excellent raw storage stability.

Example 3 The dye-donating substance PM-5 in Example 2 was changed to PM-4, and the microcapsules in sample N011 were prepared as shown in the table below.
The same operation as in Example 2 was performed except for changing to 2.

The results obtained are shown in Table 2 below.

As is clear from Table 2, the maximum concentration decreases in the sample (sample No. 9) to which a development inhibitor that is not microencapsulated is added, whereas the sample containing a development inhibitor in microcapsules has a lower maximum concentration. It can be seen that the sample to which the sample was added had a high maximum concentration, and there was almost no increase in the minimum concentration in the forced deterioration test, that is, the contrast was high.

Example-4 [Preparation of dye-providing substance dispersion] 14 g of dye-providing substance ■, tricresyl phosphate 2
2 g and 0.6 g of sodium succinate-2-ethylhexyl ester sulfonate were dissolved in ethyl acetate 401 (l), mixed with 7.5 wt% gelatin aqueous solution, and mixed with an ultra-high speed homogenizer (Biotron, BT-108). 15
,0OOR,P,M for 15 minutes, ethyl acetate was distilled off to obtain dye-providing compound dispersion 240.12.

[Preparation of thermal solvent dispersion] A thermal solvent dispersion was prepared in the same manner as in Example-2 except that p-toluamide in Example-2 was changed to α-toluenesulfonamide.

[Preparation of green-sensitive silver iodobromide emulsion] Silver iodobromide emulsion used in Example 2 7001Q4-Hydroxy-6-methyl-3,3a,7 tetrazaindene 0.40 geladine
32Q Sodium thiosulfate tomg sensitizing dye methanol 1 below
% solution 80-distilled water
1200d sensitizing dye (b) [Preparation of heat-developable photosensitive material] (Coating solution composition) Green-sensitive silver iodobromide emulsion 120-Thermal solvent dispersion 36-Dye-providing substance dispersion 115d Microparticle dispersion-
13:hQ Photographic gelatin 10wt% aqueous solution 40guanidine trichloride [10 vinegar flt10wt% ethanol solution
65% decaglyceryl monolaurate 5wt% aqueous solution 20d4.4
-Dimethyl-1-p- Tolyl-3-pyrazolidinone 1 wt% methanol solution 18- Correction water 23 Hardener solution (tetravinylsulfonylmethylmethane 2 wt% methanol solution) 11- Total
48
0d (however, the pH of the coating solution was set to 6.5) or more was coated on the same support as in Example-2 with a wet film thickness of 45%.
．． It was applied to a thickness of 7 μm and dried to produce a heat-developable photosensitive material.

(Sample No. 0.11) As a comparison sample, Sample No. 1 was the same as Test FIN 0.11 except that an aqueous solution of a development inhibitor and gelatin was used instead of Microcapsule Dispersion-1 in Sample No. 11.
O,12 was produced. Here, the amount of development inhibitor and gelatin applied was adjusted to be the same as Sample No. 11.

Furthermore, as a comparison sample, a sample in which the microcapsule dispersion-1 in test FIN0.11 was not used at all and only the corresponding amount of gelatin was corrected (sample No. 13)
)made.

[Preparation of image-receiving member] The following layers were sequentially coated on a 100 μm-thick transparent polyethylene terephthalate film.

(1) Layer made of polyacrylic acid.

(7,OOQ/f) (2) A layer consisting of cellulose acetate.

(4,OOMf) (3) Styrene and N-benzyl-N,N-dimethyl-N
- a layer consisting of a 1:1 copolymer of (3-maleimidopropyl)ammonium chloride and gelatin.

(Copolymer 3.00 (+/ 1”), Gelatin 3.0 (
1 (1/11') (4) Layered urea consisting of urea and polyvinyl alcohol (degree of saponification 98%) 4. OQ/*' Polyvinyl alcohol 3.00/11' [Evaluation of photographic properties] The photothermographic material was exposed to light through a step wedge, and together with the image receiving member, heat development was performed at 150° C. for 1 minute. It was peeled off to obtain a magenta transferred image on the image receiving member.

In addition, a forced deterioration test was conducted in the same manner as in Example 2.

Note that the maximum density and minimum density were measured as permeation density.

The results obtained are shown in Table 3.

As is clear from Table 3, even in the heat-developable light-sensitive material using a reducing dye-providing substance, the heat-developable light-sensitive material of the present invention in which the development inhibitor is contained in microcapsules has the following properties: It can be seen that the maximum density is high and the minimum density is low, that is, the contrast is high, and furthermore, the raw storage stability is excellent.

Claims (1)

[Claims] A heat-developable photosensitive material having at least a photosensitive silver halide, a dye-donating substance, a reducing agent, a binder, and a development inhibitor on a support, characterized in that the development inhibitor is contained in microcapsules. Development photosensitive material.