JPH09251198A - Image receiving paper for forming heat-developed color image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain image receiving paper for producing a color hard copy having satisfactory handleability, excellent in curling characteristics and especially having low dependency of curling on environmental humidity. SOLUTION: Dampening water is imparted to the surface of the photosensitive layer of a heat-developable photosensitive material and this material is laid on image receiving paper and heated to form a color image on the image receiving layer of the image receiving paper. The substrate of the image receiving paper has at least one hydrophobic polymer layer using a hydrophobic polymer as a binder on each of both sides of base paper and the ratio Rb/Rf of the moisture permeability of the hydrophobic polymer layer on the rear side to that on the front side is >=2 or the substrate has a hydrophobic polymer layer on only one side of base paper coated with the image receiving layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-developable color image forming image-receiving paper in which curling has little dependency on environmental humidity.

[0002]

2. Description of the Related Art Photothermographic materials are well known in the art, and the photothermographic material and its process are described, for example, in "Basics of Photographic Engineering", Non-silver salt photograph edition (1982, Corona Publishing Co., Ltd., pages 242-255). Page, U.S. Pat. No. 4,500,
626, etc.

In addition, for example, a method of forming a dye image by a coupling reaction between an oxidized product of a developing agent and a coupler is disclosed in US Pat. Nos. 3,761,270 and 4,021,2.
No. 40, etc. Also, a method of forming a positive color image by a photosensitive silver dye bleaching method is disclosed in US Pat. No. 4,23.
5,957, etc.

Recently, a method of releasing or forming a diffusible dye on an image by heat development and transferring the diffusible dye to a dye fixing element has been proposed. In this method, a negative dye image or a positive dye image can be obtained by changing the kind of dye-donor compound used or the kind of silver halide used. More specifically, U.S. Pat. Nos. 4,500,626 and 4,483,914.
No. 4,503,137, 4,559,290
JP-A-58-149046, JP-A-60-133.
No. 449, No. 59-218443, No. 61-2380.
56, European Patent Publication 220746A2, Open Technical Report 8
7-6199, European Patent Publication No. 210660A2 and the like.

Many methods have been proposed for obtaining a positive color image by thermal development. For example, in U.S. Pat. No. 4,559,290, a so-called DRR compound, which is an oxidized type compound having no color image releasing ability, is allowed to coexist with a reducing agent or a precursor thereof, and the amount of silver halide is changed by heat development. A method has been proposed in which the reducing agent is oxidized by the above method, and the diffusible dye is released by reducing the remaining reducing agent without being oxidized. In European Patent Publication No. 220746A and Kokai Giho No. 87-6199 (Vol. 12, No. 22), NX bond (X is oxygen atom, nitrogen atom or sulfur) is used as a compound that releases a diffusible dye by a similar mechanism. Photothermographic materials are described which use compounds which release diffusible dyes by the reductive cleavage of (representing atoms).

[0006]

As a simple image forming method using such a photothermographic material, a small amount of dampening water is applied to the photosensitive layer surface of the photosensitive material, and then image receiving papers are superposed and heated. Japanese Patent Laid-Open No. 64-13546 discloses a method of forming a color image on the image receiving layer of an image receiving paper by developing silver halide and transferring the dye in one step. When such an image forming method is compared with a conventional so-called conventional photographic method such as color paper development processing, there is no operation corresponding to the final washing step which is indispensable in liquid development processing. A relatively large amount of water-soluble salts remains on the image receiving paper, and it easily absorbs moisture.
As a result, the treated image-receiving paper has a large curling environmental humidity dependency. Particularly, in the case of a paper support, there is a drawback that the curling becomes stronger because the rigidity of the support itself is low.

As a method for solving this problem, the rigidity of the support is increased by increasing the thickness or changing the material to make it less susceptible to the expansion and contraction of the image receiving layer, or the surface opposite to the surface coated with the image receiving layer has a similar moisture absorption property. There is known a method of improving the property by providing a hydrophilic binder layer having properties and balancing the front surface and the back surface. However, the former is undesirably thick or too stiff and is not preferable in handling the processed print. Further, the latter has a drawback that the manufacturing cost is high and that the front and back surfaces are composed of hydrophilic binders, so that if the front and back surfaces of the image receiving material are in contact with each other during storage, they tend to adhere.

Accordingly, it is an object of the present invention to provide an image-receiving paper for heat-development color image formation for obtaining a color hard copy which is easy to handle and has excellent curling properties, and in particular, curling has little dependency on environmental humidity. .

[0009]

As a result of intensive experiments, the present inventor has found that the above problems can be solved by the following color image forming method. That is, (1) dampening water is applied to the photosensitive layer surface of a heat-developable color photosensitive material having a photosensitive silver halide, a reducing agent, a binder, and a dye-donating compound on a support, and then superposed on an image-receiving paper. In an image receiving paper used in a heat development color image forming method for forming a color image on the image receiving layer of the image receiving paper by heating, the support of the image receiving paper has at least one hydrophobic polymer layer on each side of the base paper. The water vapor transmission rate Rb of the hydrophobic polymer layer on the back side as viewed from the side where the image receiving layer is provided.
And a ratio Rb / Rf of the hydrophobic polymer layer on the side where the image receiving layer is provided (front side) to the water vapor transmission rate Rf is 2 or more. (2) An image-receiving paper for heat-developable color images according to (1), wherein the hydrophobic polymer layer is made of an acrylic resin. (3) In the image-receiving paper for heat-development color image formation according to (1) or (2), the solid content coating amount on the front side of the hydrophobic polymer layer is 5 g or more and 10 g or less per 1 m ^2. Receiving paper for heat development color image formation. (4) After dampening water is applied to the photosensitive layer surface of a heat-developable color light-sensitive material having a photosensitive silver halide, a reducing agent, a binder, and a dye-donating compound on a support, it is superposed on an image-receiving paper and heated. In the image receiving paper used in the thermal development color image forming method for forming a color image on the image receiving layer of the image receiving paper, the paper support of the image receiving paper is on the front surface on which the image receiving layer of the base paper is coated. An image-receiving paper for heat-development color image formation, which comprises at least one hydrophobic polymer layer. (5) In the image-receiving paper for heat-development color image formation according to (4), the solid-state coating amount of the front side hydrophobic polymer layer is 5 g or more and 20 g or less per 1 m ^2. Image receiving paper. (6) The image-receiving paper for heat-development color image formation according to (4) and (5), wherein the hydrophobic polymer layer is made of an acrylic resin.

Hereinafter, the present invention will be described in detail. As the hydrophobic polymer that constitutes the hydrophobic polymer layer in the present invention, a hydrophobic polymer having a relatively high moisture permeability is preferable.
Specific examples thereof include polyvinyl chloride; polyacrylonitrile; polyvinyl acetate; urethane resin; urea resin; melamine resin; phenol resin; epoxy resin; fluororesin such as polyvinylidene fluoride; butadiene rubber, chloroprene rubber, natural rubber, etc. Rubbers; acrylic resins made of acrylic acid or methacrylic acid esters such as polymethyl methacrylate and polyethyl acrylate; polyester resins such as polyethylene phthalate; polyamide resins such as nylon 6, nylon 66; cellulose resins such as cellulose triacetate; silicone resins And water-insoluble polymers such as or derivatives thereof. Further, it may be a homopolymer composed of one kind of monomer or a copolymer composed of two or more kinds of monomers.

Particularly preferred hydrophobic polymers are copolymers of alkyl acrylate or alkyl methacrylate with acrylic acid or methacrylic acid (acrylic acid or methacrylic acid is preferably 5 mol% or less), styrene-
Butadiene copolymer, styrene-butadiene-acrylic acid copolymer (acrylic acid is preferably 5 mol% or less), styrene-butadiene-divinylbenzene-methacrylic acid copolymer (methacrylic acid is preferably 5 mol% or less), vinyl acetate-ethylene-acrylic. Examples thereof include acid copolymers (acrylic acid is 5 mol% or less), ethyl acrylate-glycidyl methacrylate-acrylic acid copolymers, and the like. These may be used alone or in combination of two or more.

In the hydrophobic polymer layer, if necessary, a matting agent, a surfactant, a dye, a slip agent, a cross-linking agent, a thickener,
Photographic additives such as UV absorbers, optical brighteners, and inorganic fine particles such as colloidal silica may be added.

The hydrophobic polymer layer of the present invention may be one layer or two or more layers. There is no particular limitation on the thickness of the hydrophobic polymer layer of the present invention. However, if the thickness of the hydrophobic polymer layer on the back side is too large, the water vapor permeability of the polymer layer becomes insufficient, and the moisture absorption / desorption of the base paper layer is impeded, resulting in poor curling. Of course, the thickness of the hydrophobic polymer layer also depends on the physical properties of the hydrophobic polymer used. Therefore, it is necessary to determine the thickness of the hydrophobic polymer layer in consideration of both of them. A preferable solid coating amount of the hydrophobic polymer layer on the back side is 10 g or less, preferably 6 g or less per 1 m ² , though it depends on the kind of the hydrophobic polymer of the hydrophobic polymer layer. On the other hand, for the thickness of the hydrophobic polymer layer on the front side,
It is necessary that water in the coating solution can be blocked in the steps of coating and drying the image-receiving layer, and that water can be similarly blocked in the heat development step. For this reason, at least 5 g or more, preferably 10 g or more per 1 m ² . When the hydrophobic polymer layer of the present invention is composed of two or more layers, the sum of the coating amounts of the hydrophobic polymer layers is the total coating amount of the hydrophobic polymer layer of the image receiving paper of the present invention.

The water vapor permeability in the present invention is JIS-Z-0.
It can be measured by the method described in 208. However, in the present invention, it is difficult to take out and measure only the hydrophobic polymer film with its thickness. Therefore, the measurement was performed by using the base paper to be used with one side coated with the hydrophobic polymer layer to be measured. Therefore, the measured value represents the water vapor transmission rate of the coated hydrophobic polymer film and the base paper together. However, the base paper has almost no moisture-proof effect, and the value of moisture permeability is considered to be the property itself of the hydrophobic polymer film.

The image-receiving layer provided on the image-receiving paper of the present invention is preferably a layer containing a mordant and a binder. As the mordant, those known in the photographic field can be used, and specific examples thereof include the mordant described in US Pat. No. 4,500,626, columns 58 to 59 and JP-A No. 61-88256, pages (32) to (41). JP-A Nos. 62-244043 and 62-2.
Examples thereof include those described in No. 44036. Further, a dye-receiving polymer compound as described in U.S. Pat. No. 4,463,079 may be used. If necessary, the image-receiving paper may be provided with auxiliary layers such as a protective layer, a peeling layer and an anti-curl layer. It is particularly useful to provide a protective layer.

A hydrophilic binder is preferably used as the binder of the constituent layers of the image-receiving paper (excluding the hydrophobic polymer layer). Examples thereof include those described on pages (26) to (28) of JP-A-62-253159. Specifically, a transparent or translucent hydrophilic binder is preferable, for example, gelatin, a protein or cellulose derivative such as a gelatin derivative, starch, gum arabic,
Examples include natural compounds such as polysaccharides such as dextran and pullulan, polyvinyl alcohol, polyvinylpyrrolidone, acrylamide polymers, and other synthetic high molecular compounds. Furthermore, superabsorbent polymers described in JP-A-62-245260, i.e. -COOM or -SO ₃
Homopolymers of vinyl monomers having M (M is a hydrogen atom or an alkali metal) or copolymers of these vinyl monomers with each other or with other vinyl monomers (for example, sodium methacrylate, ammonium methacrylate, manufactured by Sumitomo Chemical Co., Ltd.) Sumika gel L-5H) is also used. These binders can be used in combination of two or more kinds.

When a system in which a small amount of water is supplied for thermal development is adopted, it is possible to quickly absorb water by using the above superabsorbent polymer. In addition, when a super absorbent polymer is used in the image receiving layer or its protective layer, it is possible to prevent the dye from being retransferred from the image receiving paper to another after transfer.

As the base paper used for the image receiving paper of the present invention, in addition to ordinary paper using natural pulp, film-processed synthetic paper made from polypropylene or the like, or mixed paper made from synthetic resin pulp such as polyethylene and natural pulp , Yankee paper, baryta paper, coated paper (particularly cast coated paper) can be used.

The thickness of the support varies depending on the purpose for which it is used, but is generally 40 μm or more and 400 μm or less. However, in the case of a method in which an image is formed using an element applied on two or more separate supports, the non-image-side support on the element ultimately has a thinner support than the aforementioned range. A body (5 μm or more and 250 μm or less) is preferably used.

In the heat-developable color light-sensitive material of the present invention, basically, a light-sensitive silver halide, a reducing agent, a binder and a dye-donating compound (which may also serve as a reducing agent as described later) are formed on a support. In addition, an organic metal salt oxidizing agent and the like can be added as necessary. These components are often added to the same layer,
If it can react, it can be added in separate layers. For example, if a coloring dye-providing compound is present in the lower layer of the silver halide emulsion, the sensitivity can be prevented from lowering.
The reducing agent is incorporated in the photothermographic material, and further, for example, by a method of diffusing from a dye fixing element described later,
You may use together the method supplied from the outside. By incorporating a reducing agent in the light-sensitive material, an effect of promoting color image formation can be obtained.

In order to obtain a wide range of colors in the chromaticity diagram using the three primary colors of yellow, magenta and cyan, at least three silver halide emulsion layers sensitive to different spectral regions are used in combination. . For example, there are a combination of three layers of a blue-sensitive layer, a green-sensitive layer, and a red-sensitive layer, and a combination of a green-sensitive layer, a red-sensitive layer, and an infrared-sensitive layer. Each photosensitive layer can adopt various arrangement orders known for ordinary type color photosensitive materials. Each of these photosensitive layers may be divided into two or more layers as necessary.

The photothermographic material can be provided with various auxiliary layers such as an undercoat layer, an intermediate layer, a yellow filter layer, an antihalation layer and a back layer, in addition to the above-mentioned protective layer.

The silver halide emulsion (emulsion containing photosensitive silver halide) in the present invention may have various shapes. Examples of these are cubes, octahedra,
Examples thereof include regular particles having a regular crystal such as a tetradecahedron, tabular particles, spherical particles, and particles having an irregular crystal shape such as potato particles.

As the silver halide composition of the grains, any one of silver bromide, silver iodobromide, silver iodochlorobromide, silver chlorobromide, silver chloroiodide, and silver chloride is used. Good, but
Silver bromide or silver chlorobromide is preferred. Further, it may contain silver thiocyanate, silver cyanate and the like. The silver halide composition in the grain may be uniform, may have different halogen compositions inside and outside, or may have a layered structure (JP-A-57-154232, JP-A-58-154232).
-108533, 58-248469, 59-
48755, 59-52237, U.S. Pat.
505, 068, 4,433, 048, 4, 4
44,877, European Patent 100,984, and British Patent 1,027,146).

The silver halide emulsion may be monodisperse or polydisperse, and a mixture of monodisperse emulsions may be used. The particle size is preferably 0.01 μm to 10 μm, particularly preferably 0.1 μm to 3 μm. Here, the monodisperse silver halide emulsion means 95% of the total weight or the total number of silver halide grains contained therein.
The above is within ± 40% of the average particle size, more preferably ± 30
Is defined as being within%.

Specifically, US Pat. No. 4,500,62
No. 6, Column 50, No. 4,628,021, Research
Disclosure magazine (hereinafter abbreviated as RD) 1702
9 (1978) and any of the silver halide emulsions described in JP-A No. 62-253159 and the like can be used.

The silver halide emulsion used in the present invention may be either a surface latent image type emulsion or an internal latent image type emulsion. The internal latent image type emulsion is used as a direct reversal emulsion in combination with a nucleating agent or light fogging.

In the present invention, two or more kinds of silver halides having different crystal habits, halogen compositions, grain sizes, grain size distributions and the like can be used in combination, and they can be used in different emulsion layers and / or the same emulsion layer. It is possible to use.

In particular, tabular silver halide grains have already been reported in US Pat. Nos. 4,434,226 and 4,4.
Nos. 39,520, 4,414,310, 4,43
No. 3,048, No. 4,414,306, No. 4,45
9,353, JP-A-59-99433, JP-A-62-2
No. 09445 discloses the production method and use technique. Further, JP-A-63-220238 and JP-A-1-
No. 201649 discloses tabular silver halide grains in which dislocations are intentionally introduced.

The preferable ratio of average grain diameter to average grain thickness (hereinafter referred to as grain diameter / thickness) in the tabular grains is 2 or more, preferably 3 to 12, and particularly 5
It is preferably -8. Here, the grain diameter / thickness can be obtained by averaging the grain diameters / thicknesses of all tabular grains, but a simple method is to use the ratio of the average diameter of all tabular grains to the average thickness of all average grains. Can be asked as The tabular grains have a diameter (equivalent to a circle) of 0.3 μm or more, preferably 0.3 to 10 μm, and more preferably 0.5 to
The thickness is 5.0 μm, more preferably 0.5 to 2.0 μm. The grain thickness is less than 1.0 μm, preferably 0.05
~ 0.5 µm, more preferably 0.08 to 0.3 µm
It is.

In the present invention, the tabular grains account for 50% or more of the projected area of all grains in the emulsion containing the tabular grains. It is preferably 70% or more, more preferably 90% or more. The grain diameter and grain thickness of tabular grains can be measured by electron micrographs of grains as described in US Pat. No. 4,434,226. Specific examples of the halogen composition of tabular grains include silver chloroiodide, silver iodobromide, silver chloride, silver chlorobromide, silver bromide, and silver chloroiodobromide. Or silver chlorobromide is preferred. Further, silver thiocyanate, silver cyanate and the like may be contained. Further, in the present invention, the tabular grains are preferably monodisperse. The structure and manufacturing method of monodisperse tabular grains are described in, for example, JP-A-63-151618.

In the tabular grains, silver halides having different compositions may be joined by epitaxial joining, or may be joined with compounds other than silver halide such as silver thiocyanate and oxides. These emulsion grains are described in U.S. Pat.
142,900, 4,459,353, British Patent 2,038,792, U.S. Patent 4,349,62.
No. 2, No. 4,395, 478, No. 4,433, 501
Issue 4,463,087, Issue 3,656,962
No. 3,852,067, JP-A-59-16254.
No. 0 and the like.

The silver halide grains used in the present invention are:
Graphide, "Physics and Chemistry of Photography", published by Paul Montell (P. Glafkides, Chimie et P.
hysique Photographique, Pa
ul Montel, 1967), "Photographic Emulsion Chemistry" by Duffin, published by Focal Press (GF Duffi).
n, Photographic Emulsion C
hemistry, Focal Press, 196
6), "Production and Coating of Photographic Emulsion", by Zerikman et al., Published by Focal Press (VL Zelikman et al.).
al, Making and Coating Pho
topographic Emulsion, Focal
Press, 1964) and the like. That is, any of an acidic method, a neutral method, an ammonia method, and the like may be used, and a method of reacting a soluble silver salt and a soluble halide may be any of a one-sided mixing method, a simultaneous mixing method, a combination thereof, and the like. . A method of forming grains in the presence of excess silver ions (a so-called reverse mixing method) can also be used. As one type of the double jet method, a method in which pAg in a liquid phase in which silver halide is formed is kept constant, that is, a so-called controlled double jet method can be used. According to this method, a silver halide emulsion having a regular crystal form and a nearly uniform grain size can be obtained. In addition, 2 formed separately
A mixture of two or more kinds of silver halide emulsions may be used.

The silver halide emulsion consisting of the above regular grains can be obtained by controlling the pAg and pH during grain formation. For more information, for example,
Science and Engineering (Photog
raphic science and engineering
ering), Vol. 6, 159-165 (196)
2); Journal of Photographic Science (Journal of Photographics)
c Science), Volume 12, pp. 242-251 (1
964), U.S. Pat. No. 3,655,394 and British Patent No. 1,413,748.

Regarding the monodisperse emulsion, JP-A-48-
No. 8600, No. 51-39027, No. 51-8309
No. 7, No. 53-137133, No. 54-48521
No. 54-99419, No. 58-37635, No. 58-49938, Japanese Patent Publication No. 47-11386, US Pat. No. 3,655,394 and British Patent No. 1,41.
3, 748 and the like.

During the production of emulsions containing tabular grains, a silver salt solution (eg AgN) added to accelerate grain growth.
A method of increasing the addition rate, the addition amount, and the addition concentration of the O ₃ aqueous solution) and the halide solution (for example, KBr aqueous solution) is preferably used. Regarding these methods, for example, British Patent No. 1,335,925 and US Pat. No. 3,67
2,900, 3,650,757, 4,24
No. 2,445, JP-A Nos. 55-142329 and 55-
The description of No. 158124 can be referred to.

To accelerate the ripening of silver halide grains,
Silver halide solvents are useful. For example, it is known to have an excess of halogen ions in the reactor to promote ripening. Therefore, introduction of a silver halide solution into the reactor can accelerate ripening. Other ripening agents can be used, these ripening agents can be incorporated in their entirety in the dispersion medium in the reactor before adding the silver and halide salts, and one or more ripening agents can be used. And a peptizer may be added and introduced into the reactor. As another variant, the ripening agent can be introduced independently during the halide salt and silver salt addition steps.

As ripening agents other than halogen ions, ammonia, amine compounds, thiocyanate salts,
For example, alkali metal thiocyanate salts, especially sodium and potassium thiocyanate salts, and ammonium thiocyanate salts can be used. The use of thiocyanate ripening agents is described in US Pat. No. 2,222,264.
Nos. 2,448,534 and 3,320,06
No. 9 teaches. US Patent No. 3,271,1
57, 3,574,628 and 3,73
Conventional thioether ripening agents as described in 7,313 can also be used. In addition, JP-A-53-8
It is also possible to use thione compounds as disclosed in 2408 and 53-144319.

The properties of the silver halide grains can be controlled by allowing various compounds to be present in the silver halide precipitation forming process. Such compounds may be initially present in the reactor. In addition, one or more salts can be added together with the salt according to a conventional method. US Patent Nos. 2,448,060 and 2,628,167
Issue 3, Issue 3,737,313, Issue 3,772,031
Issue, and Research Disclosure, Vol. 134,
June 1975, 13452, copper, iridium, lead, bismuth, cadmium, zinc, (sulfur,
The characteristics of silver halide can be controlled by allowing compounds such as chalcogen compounds such as selenium and tellurium), compounds such as gold and compounds of Group VII noble metals to be present during the silver halide precipitation formation process. Japanese Patent Publication 58-1410
Issue, Moisar et al., Journal of Photographic Science, 25, 1977.
As described on pages 19 to 27, the silver halide emulsion can reduce-sensitize the inside of the grain during the precipitation formation process.

It is also possible to carry out chemical sensitization in the presence of a chemical sensitization aid. Compounds known to suppress fog and increase sensitivity in the course of chemical sensitization, such as azaindene, azapyridazine and azapyrimidine, are used as the chemical sensitization aid. Examples of chemical sensitization aids are
U.S. Pat. Nos. 2,131,038 and 3,411,91
4, 3,554,757, JP-A-58-1265.
36, JP-A-62-253159 and Duffin, "Photographic Emulsion Chemistry", pages 138 to 143 (published by Focal Press, 1966).

The silver halide grains used in the present invention are
Usually, those subjected to physical ripening, chemical ripening and spectral sensitization are used. The additive used in such a process is Research Disclosure No. 17643 and N
o. 18716.

As the protective colloid used when preparing the emulsion of the present invention, it is advantageous to use gelatin, but other hydrophilic colloids can also be used. For example, gelatin derivatives, graft polymers of gelatin and other polymers, proteins such as albumin and casein; cellulose derivatives such as hydroxyethyl cellulose, carboxymethyl cellulose, cellulose sulfates, etc .; sugar derivatives such as sodium alginate and starch derivatives; Polyvinyl alcohol, polyvinyl alcohol partial acetal, poly-N-vinylpyrrolidone, polyacrylic acid,
Various synthetic hydrophilic polymer substances such as single or copolymers such as polymethacrylic acid, polyacrylamide, polyvinylimidazole, polyvinylpyrazole, etc. can be used.

Examples of gelatin include lime-processed gelatin, acid-processed gelatin and Bull. Soc. Sci. Ph
oto. Japan, No. 16, P30 (1966)
You may use the enzyme-treated gelatin as described in,
Further, a hydrolyzate or an enzymatic hydrolyzate of gelatin can be used.

Various antifoggants or photographic stabilizers can be used in the present invention. Examples thereof include azoles and azaindenes described in RD17643 (1978), pages 24 to 25, JP-A-59-16844.
Nitrogen-containing carboxylic acids and phosphoric acids described in JP-A No. 2-11, mercapto compounds and metal salts thereof described in JP-A-59-111636, and acetylene compounds described in JP-A-62-87957 are used.

The silver halide used in the present invention may be spectrally sensitized with methine dyes and the like. Dyes used include cyanine dyes, merocyanine dyes, complex cyanine dyes, complex merocyanine dyes, polopolar cyanine dyes, hemicyanine dyes, styryl dyes and hemioxonol dyes. Specifically, U.S. Pat. No. 4,617,257, and JP-A-59-180550.
No. 60-140335, RD17029 (197
8 years), sensitizing dyes described on pages 12 to 13 and the like.
These sensitizing dyes may be used alone or in combination thereof, and the combination of sensitizing dyes is often used particularly for the purpose of supersensitization.

Along with the sensitizing dye, a dye having no spectral sensitizing effect itself or a compound which does not substantially absorb visible light and exhibits supersensitization may be contained in the emulsion (see, for example, US Pat. Nos. 3,615,641 and JP-A-63-23145).

The timing of adding these sensitizing dyes to the emulsion may be during or after chemical ripening, or according to US Pat. Nos. 4,183,756 and 4,225,666. It may be before or after nucleation. In particular, the presence of a sensitizing dye at the time of chemical sensitization often gives a preferable effect. The addition amount is generally about 10 ⁻⁸ to 10 ⁻² mol per mol of silver halide.

Useful sensitizing dyes used in the present invention are, for example, US Pat. Nos. 3,522,052 and 3,619,1.
Nos. 97, 3,713,828 and 3,615,64
No. 3, No. 3,615,632, No. 3,617,293
No. 3,628,964 and 3,703,377
Nos. 3,666,480 and 3,667,960
No. 3,679,428, 3,672,897
Nos. 3,769,026 and 3,556,800
Nos. 3,615,613 and 3,615,638
No. 3,615,635, 3,705,809
Nos. 3,632,349 and 3,677,765
No. 3,770,449 and 3,770,440
No. 3,769,025, No. 3,745,014
Nos. 3,713,828 and 3,567,458
Nos. 3,625,698 and 2,526,632
No. 2,503,776, JP-A-48-76525.
And Belgian Patent No. 691,807.

The coating amount of the photosensitive silver halide used in the present invention is in the range of 1 mg / m ^{3 to} 10 g / m ^{3 in} terms of silver.

In the present invention, an organic metal salt may be used as an oxidizing agent together with the photosensitive silver halide. Among such organic metal salts, an organic silver salt is particularly preferably used. Organic compounds that can be used to form the above organic silver salt oxidizing agents include US Pat.
Benzotriazoles, fatty acids and other compounds described in No. 26, columns 52-53 and the like. Japanese Patent Application Laid-Open No. 60-1
A silver salt of a carboxylic acid having an alkynyl group such as silver phenylpropiolate described in JP-A-13235;
The acetylene silver described in No. 249044 is also useful. Two or more organic silver salts may be used in combination.

The above organic silver salts are photosensitive silver halides.
0.01 to 10 mol, preferably 0.1 to 10 mol, per mol.
01 to 1 mol can be used in combination. The total coating amount of the photosensitive silver halide and the organic silver salt is suitably from 50 mg to 10 g / m ² in terms of silver.

Various antifoggants or photographic stabilizers can be used in the present invention. Examples thereof include azoles and azaindenes described in RD17643 (1978), pp. 24-25, and JP-A-59-1684.
No. 42 nitrogen-containing carboxylic acids and phosphoric acids,
Alternatively, a mercapto compound and a metal salt thereof described in JP-A-59-111636, an acetylene compound described in JP-A-62-87957, and the like are used.

As the reducing agent used in the present invention, those known in the field of photothermographic materials can be used. Further, a dye-providing compound having a reducing property described later is also included (in this case, another reducing agent may be used in combination). Further, a reducing agent precursor which does not itself have a reducing property but expresses a reducing property by the action of a nucleophilic reagent or heat during the development process can be used.

Examples of the reducing agent used in the present invention include:
U.S. Pat. No. 4,500,626, columns 49-50, 44.
No. 83914, columns 30-31, No. 4330617,
Nos. 4590152 and pp. 17-17 of JP-A-60-140335, pp. 57-40245 and pp. 56
138736, 59-178458, 59-
Nos. 53831, 59-182449 and 59-18
No. 2450, No. 60-119555, No. 60-128
From No. 436 to No. 60-128439, No. 60-1
No. 98540, No. 60-181742, No. 61-25
No. 9253, No. 62-244444, No. 62-131
From 253 to 62-131256, there are reducing agents and reducing agent precursors described in EP 220746A2, pages 78 to 96 and the like. US Patent No. 303986
Combinations of various reducing agents such as those disclosed in No. 9 can also be used.

When a diffusion resistant reducing agent is used, an electron transfer agent and / or an electron transfer agent may be optionally added in order to promote electron transfer between the diffusion resistant reducing agent and the developable silver halide.
Alternatively, an electron transfer agent precursor can be used in combination. The electron transfer agent or its precursor can be selected from the above-mentioned reducing agents or its precursors. It is desirable that the mobility of the electron transfer agent or its precursor is higher than that of the diffusion-resistant reducing agent (electron donor). Particularly useful electron transfer agents are 1-phenyl-3-pyrazolidones or aminophenols.

The diffusion-resistant reducing agent (electron donor) used in combination with the electron transfer agent may be any of those reducing agents which do not substantially move in the layer of the photosensitive element.
Preferred are hydroquinones, sulfonamidophenols, sulfonamidonaphthols, and JP-A-53-11.
Compounds described as electron donors in No. 0827 and dye-donating compounds having a diffusion-resistant and reducing property described later are exemplified.

In the present invention, the reducing agent is added in an amount of 0.001 to 20 mol, and particularly preferably 0.1 to 20 mol, based on 1 mol of silver.
01 to 10 mol.

In the present invention, when a silver ion is reduced to silver under a high temperature condition, a compound that produces or releases a mobile dye in response to this reaction or in the opposite reaction, that is, a dye-donor is provided. It may also contain a sex compound. First, examples of the dye-donating compound that can be used in the present invention include a compound (coupler) that forms a dye by an oxidative coupling reaction. The coupler may be a 4-equivalent coupler or a 2-equivalent coupler. Further, a 2-equivalent coupler which has a diffusion-resistant group as a leaving group and forms a diffusible dye by an oxidative coupling reaction is also preferable. The diffusion resistant group may form a polymer chain.
For specific examples of color developers and couplers, see TH James “Th
e Theory of the Photographic Process "4th edition 291
To 334 and 354 to 361, JP-A-58-1
No. 23533, No. 58-149046, No. 58-14
Nos. 9047, 59-111148, 59-124
No. 399, No. 59-174835, No. 59-2315
No. 39, No. 59-231540, No. 60-2950
No. 60-2951, No. 60-14242, No. 6
Nos. 0-23474 and 60-66249.

As another example of the dye-donating compound,
Compounds having a function of releasing or diffusing a diffusible dye in an image form can be mentioned. This type of compound can be represented by the following general formula [LI]. (Dye-Y) n -Z [LI] Dye represents a dye group, a temporarily shortened dye group or a dye precursor group, Y represents a simple bond or a linking group, and Z represents an image-like latent image. (Dye-Y) n -Z or a difference in the diffusivity of the compound represented by (Dye-Y) n-Z, or Dye is released, and the released Dye and (Dye- Y) represents a group having a property that causes a difference in diffusivity with n-Z, n represents 1 or 2, and when n is 2, two Dye-Ys are the same but different. Is also good.

Specific examples of the dye-donating compound represented by the general formula [LI] include the following compounds. The following (1) to (4) are to form a diffusible dye image (positive dye image) in reverse correspondence to the development of silver halide, and "(1)" is to form a diffusible dye image (positive dye image) in correspondence to the development of silver halide. (A negative dye image).

US Pat. Nos. 3,134,764 and 336.
No. 2819, No. 3597200, No. 3544545
No. 3,482,972, etc., a dye developing agent comprising a hydroquinone-based developing agent and a dye component linked to each other. This dye developer is diffusible in an alkaline environment, but becomes non-diffusible when reacted with silver halide.

As described in US Pat. No. 4,053,137, a non-diffusible compound which releases a diffusible dye in an alkaline environment but loses its ability when reacted with silver halide can be used. Examples of the compound include a compound capable of releasing a diffusible dye by an intramolecular nucleophilic substitution reaction described in US Pat. No. 3,980,479, US Pat.
Compounds that release a diffusible dye by the intramolecular rewinding reaction of the isoxazolone ring described in JP-A No. 354 and the like.

US Pat. No. 4,559,290, European Patent 220746A2, US Pat. No. 4,783,396,
As described in Published Technical Report 87-6199, a non-diffusible compound which releases a diffusible dye by reacting with a reducing agent left unoxidized by development can also be used.

As an example, US Pat. No. 4,133,938.
Nos. 9 and 4139379, JP-A-59-185333.
And compounds which release a diffusible dye by a nucleophilic substitution reaction in the molecule after reduction described in U.S. Pat. No. 4,232,107, and JP-A-59-84453.
-101649, 61-88257, RD240
No. 25 (1984) and the like, compounds which release a diffusible dye by an intramolecular electron transfer reaction after reduction, West German Patent No. 308588A, JP-A-56-14.
No. 2530, U.S. Pat. Nos. 4,434,893 and 4,619.
No. 8450, etc., compounds which release a diffusible dye by cleavage of a single bond after reduction, US Pat.
Examples include a nitro compound which releases a diffusible dye after electron acceptance described in JP-A-223 No. 223 and the like, and a compound which releases a diffusible dye after electron acceptance described in US Pat. No. 4,609,610 and the like.

Further, as more preferable ones, European Patent No. 220746A2, Kokai Giho No. 87-6199, US Pat. No. 4,783,396 and Japanese Patent Laid-Open No. 63-201653.
In one molecule described in JP-A-63-201654 and the like.
A compound having a —X bond (X represents an oxygen, sulfur or nitrogen atom) and an electron-withdrawing group, SO ₂ —X (X has the same meaning as above) in one molecule described in JP-A-1-26842. Compound having electron-withdrawing group, JP-A-63-271344
Compounds having a PO-X bond (X has the same meaning as above) and an electron-withdrawing group in one molecule described in JP-A-63-27.
C-X 'bond (X' in marked within one molecule in 1341 issue X synonymous or or -SO ₂ - and represented) include compounds having an electron-withdrawing group.

Of these, a compound having an N—X bond and an electron-withdrawing group in one molecule is particularly preferable. Specific examples thereof include compounds (1) to (2) described in European Patent No. 220746A2.
(3), (7)-(10), (12), (13), (15), (23)-(26), (3
1), (32), (35), (36), (40), (41), (44), (53)-(5)
9), (64), (70), and the compound (1
1) to (23).

A compound (DDR coupler) which is a coupler having a diffusible dye as a leaving group and which releases the diffusible dye by a reaction with an oxidant of a reducing agent. Specifically, British Patent No. 1,330,524, JP-B-48-39165, U.S. Patent Nos. 3,443,940, 4,474,867, and 448
No. 3914 and the like.

A compound (DRR compound) which is reducible to a silver halide or an organic silver salt and releases a diffusible dye when its partner is reduced. Since this compound does not need to use another reducing agent, it is preferable because there is no problem of image contamination due to oxidized decomposition products of the reducing agent. Representative examples are U.S. Pat. Nos. 3,923,312, 4,053,312 and 405.
No. 5428, No. 4336322, JP-A-59-658.
No. 39, No. 59-69839, No. 53-3819,
Nos. 51-104343, RD17465, U.S. Pat. Nos. 3,725,062, 3,728,113 and 3,443.
No. 939, JP-A-58-11637 and JP-A-57-17.
No. 9840, U.S. Pat. No. 4,500,626, and the like. Specific examples of the DRR compound include the compounds described in the above-mentioned U.S. Pat. No. 4,500,626, columns 22 to 44, among which the compounds (1) to (3) described in the U.S. patents, (10) ~ (13), (16) ~ (19), (28)
To (30), (33) to (35), (38) to (40), and (42) to (64) are preferable. The compounds described in U.S. Pat. No. 4,639,408 at columns 37 to 39 are also useful.

In addition, as a dye-donor compound other than the above-mentioned coupler and general formula [LI], a dye silver compound in which an organic silver salt and a dye are bound (Research Disclosure, May 1978, pp. 54-58) is used. , Etc., azo dyes used in the heat developable silver dye bleaching method (US Pat.
957, Research Disclosure Magazine, 1976
Year 4 issue, pages 30 to 32, etc.), leuco dyes (US Pat. Nos. 3,985,565 and 4,022,617, etc.) can also be used.

Hydrophobic additives such as dye-donating compounds and antidiffusive reducing agents can be incorporated into the layers of the photographic material by known methods such as the method described in US Pat. No. 2,322,027. In this case, JP-A-59-83154,
59-178451, 59-178452, 59-178453, 59-178454, 5
A high boiling organic solvent as described in JP-A Nos. 9-178455 and 59-178457 may be used, if necessary, with a boiling point of 50 ° C.
It can be used in combination with a low-boiling organic solvent of up to 160 ° C.

The amount of the high-boiling organic solvent is 10 g or less, preferably 5 g or less, relative to 1 g of the dye-donor compound used. Further, 1 cc or less, more preferably 0.5 cc or less, especially 0.3 cc or less is suitable for 1 g of the binder.

JP-B-51-39853, JP-A-51-
A dispersion method using a polymer described in No. 59943 can also be used.

In the case of a compound which is substantially insoluble in water, fine particles can be dispersed and contained in a binder in addition to the above method.

When dispersing the hydrophobic compound in the hydrophilic colloid as the binder, various surfactants can be used. For example, those mentioned as surfactants on pages (37) to (38) of JP-A-59-157636 can be used.

In the present invention, a compound capable of activating development and stabilizing an image at the same time can be used in the light-sensitive material. Specific compounds preferably used are described in U.S. Pat. No. 4,500,626, columns 51 to 52.

A hydrophilic binder is preferably used as the binder of the constituent layers of the light-sensitive material. As an example, Japanese Patent Laid-Open No. Sho 6
The thing described in pages (26)-(28) of 2-253159 is mentioned. Specifically, transparent or translucent hydrophilic binders are preferred, for example, gelatin, proteins or cellulose derivatives such as gelatin derivatives, starch, gum arabic, dextran, natural compounds such as polysaccharides such as pullulan, polyvinyl alcohol, Examples include polyvinylpyrrolidone, acrylamide polymers, and other synthetic polymer compounds. Also, JP-A-62-245
Superabsorbent polymer described in No. 260, etc., that is, -CO
OM or -SO ₃ M (M is a hydrogen atom or an alkali metal) copolymer of homopolymer or a vinyl monomer together or with other vinyl monomers of the vinyl monomer having a (e.g. sodium methacrylate, ammonium methacrylate, Sumitomo Chemical (Sumikagel L-5H manufactured by Co., Ltd.)
Is also used. These binders can be used in combination of two or more kinds.

In the present invention, the coating amount of the binder is 1
It is preferably 20 g or less per m ² , particularly 10 g or less, more preferably 7 g or less.

As the hardener used for the constituent layers of the light-sensitive material and the image-receiving paper, US Pat. No. 4,678,739, column 41,
JP-A-59-116655 and JP-A-62-245261.
No. 61-18942 and the like. More specifically, aldehyde hardeners (formaldehyde etc.), aziridine hardeners, epoxy hardeners, vinyl sulfone hardeners (N, N'-ethylene-bis (vinylsulfonylacetamide)) Ethane, etc.), N-
Methylol-based hardeners (such as dimethylol urea) and polymer hardeners (compounds described in JP-A-62-234157) can be mentioned.

In the present invention, an image forming accelerator can be used in the light-sensitive material and / or the image receiving paper. The image formation accelerator includes a redox reaction between a silver salt oxidizing agent and a reducing agent, a reaction such as generation of a dye from a dye-donor substance, decomposition of the dye or release of a diffusible dye, and a light-sensitive material layer. Has a function of accelerating the movement of the dye from the image receiving layer to the image receiving layer, and from the physicochemical function, a base or a base precursor, a nucleophilic compound, a high boiling point organic solvent (oil), a thermal solvent, a surfactant, silver or It is classified into compounds that interact with silver ions. However, these substance groups generally have a composite function and usually have some of the above-mentioned promoting effects. Details of these are described in U.S. Pat. No. 4,678,739, columns 38-40.

Examples of the base precursor include salts of an organic acid and a base which are decarboxylated by heat, compounds which release amines by intramolecular nucleophilic substitution reaction, Rossen rearrangement or Beckmann rearrangement. An example is described in US Pat.
93 and JP-A-62-65038.

In a system in which heat development and dye transfer are carried out simultaneously in the presence of a small amount of water, it is preferable to add a base and / or a base precursor to the constituent layers of the image receiving paper in order to enhance the storage stability of the light-sensitive material. .

In addition to the above, a combination of a sparingly soluble metal compound described in European Patent Publication No. 210660 and a compound capable of undergoing a complex formation reaction with a metal ion constituting the sparingly soluble metal compound (referred to as a complex forming compound), JP-A-61-2
The compounds that generate a base by electrolysis as described in No. 32451 can also be used as the base precursor. In particular, the former method is effective. It is advantageous to add the hardly soluble metal compound and the complex-forming compound separately to the light-sensitive material and the image receiving paper.

In the light-sensitive material and / or the image-receiving paper of the present invention, various development terminators can be used for the purpose of always obtaining a constant image against variations in processing temperature and processing time during development. The term "development stopper" as used herein means that after proper development,
It is a compound that quickly neutralizes a base or reacts with a base to reduce the base concentration in the film and stop development, or a compound that interacts with silver and a silver salt to suppress development. In particular,
Examples include an acid precursor that releases an acid when heated, an electrophilic compound that causes a substitution reaction with a coexisting base when heated, or a nitrogen-containing heterocyclic compound, a mercapto compound, and a precursor thereof. For further details, see JP-A-62-25315.
No. 9, pages (31) to (32).

Various constituent layers (including a back layer) of the light-sensitive material or the image-receiving paper are used for the purpose of improving physical properties of the film such as dimensional stability, curl prevention, adhesion prevention, film cracking prevention, and pressure increase / decrease prevention. Of polymer latex can be included. Specifically, JP-A Nos. 62-245258 and 62
Any of the polymer latexes described in JP-B-136648 and JP-A-62-10066 can be used. In particular, when a polymer latex having a low glass transition point (40 ° C. or lower) is used for the mordant layer, cracking of the mordant layer can be prevented, and when a polymer latex having a high glass transition point is used for the back layer, the curl prevention effect is reduced. can get.

In the constituent layers of the light-sensitive material and the image-receiving paper, a high-boiling point organic solvent can be used as a plasticizer, a slipping agent, or an agent for improving the peelability between the light-sensitive element and the dye-fixing element.
Specific examples include page (25) of JP-A-62-253159,
No. 62-245253 and the like.

Further, various silicone oils (all silicone oils from dimethylsilicone oil to modified silicone oils obtained by introducing various organic groups into dimethylsiloxane) can be used for the above purpose. For example, various modified silicone oils described in “Modified Silicone Oil” technical data P6-8B issued by Shin-Etsu Silicone Co., Ltd., particularly carboxy-modified silicone (trade name X-22-3710) are effective. See also
The silicone oils described in JP-A No. 2-219553 and JP-A No. 63-46449 are also effective.

An anti-fading agent may be used for the image receiving paper. As the anti-fading agent, for example, an antioxidant, an ultraviolet absorber,
Or there is some kind of metal complex.

Examples of antioxidants include chroman compounds, coumaran compounds, phenol compounds (eg hindered phenols), hydroquinone derivatives, hindered amine derivatives, and spiroindane compounds. The compounds described in JP-A-61-159644 are also effective.

As the ultraviolet absorber, benzotriazole compounds (US Pat. No. 3,533,794, etc.), 4-
Thiazolidone-based compounds (US Pat. No. 3,352,681, etc.) and benzophenone-based compounds (JP-A-46-2784)
No. JP-A-54-48535 and JP-A-64-28535.
There are compounds described in Nos. 136641 and 61-8256. Further, ultraviolet absorbing polymers described in JP-A-62-260152 are also effective.

Examples of the metal complex include US Pat.
55, 42425018, columns 3 to 36, 4,25
4,195, columns 3 to 8, JP-A-62-174741.
No. 61-88256, pages (27) to (29), JP-A-1-75568, JP-A-62-31096, JP-A-1.
-74272 and the like.

Examples of useful anti-fading agents are disclosed in JP-A-62-21.
No. 5272, pages (125) to (137).

An anti-fading agent for preventing the fading of the dye transferred to the image-receiving paper may be contained in the dye-fixing element in advance, or may be supplied to the image-receiving paper from the outside such as a light-sensitive material. Good.

The above-mentioned antioxidant, ultraviolet absorber and metal complex may be used in combination.

A fluorescent whitening agent may be used in the light-sensitive material and the image receiving paper. In particular, it is preferable to incorporate a fluorescent brightening agent in the image receiving paper or supply it from the outside such as a photosensitive material. As an example, K.K. Veenkataraman, `` The Chemistry of Syn
thetic Dyes ", Vol. V, Chapter 8, JP-A-61-14375
Compounds described in No. 2 and the like can be mentioned. More specifically, stilbene compounds, coumarin compounds, biphenyl compounds, benzoxazolyl compounds, naphthalimide compounds, pyrazoline compounds,
Examples thereof include carbostyryl-based carboxy compounds.
The fluorescent whitening agent can be used in combination with an anti-fading agent.

In the constituent layers of the light-sensitive material and the image-receiving paper, various surfactants can be used for the purpose of coating aid, improvement of releasability, improvement of sliding property, prevention of electrostatic charge, acceleration of development and the like. Specific examples of the surfactant are disclosed in JP-A-62-173463 and 6-62.
2-183457 and the like.

The constituent layers of the light-sensitive material and the image-receiving paper may contain an organic fluoro compound for the purpose of improving slipperiness, preventing electrostatic charge, improving peelability and the like. Typical examples of the organic fluoro compound include fluorine-containing surfactants and fluorine oils described in JP-B-57-9053, columns 8 to 17, JP-A-61-29444, JP-A-62-135826 and the like. And a hydrophobic fluorine compound such as a solid fluorine compound resin such as an oily fluorine compound or a tetrafluoroethylene resin.

A matting agent can be used for the light-sensitive material and the image receiving paper. Examples of the matting agent include silicon dioxide, polyolefin and polymethacrylate.
No. 8256 (29), benzoguanamine resin beads, polycarbonate resin beads, AS
Japanese Patent Application Nos. 62-110064 and 62 for resin beads
There are compounds described in No. 110065.

In addition, a heat-solvent, a defoaming agent, an antibacterial / antifungal agent, colloidal silica and the like may be contained in the constituent layers of the light-sensitive material and the image-receiving paper. Specific examples of these additives are described in JP-A-61-88256, pages (26) to (32).

As the support of the light-sensitive material of the present invention, a support that can withstand the processing temperature is used. Generally, paper and synthetic polymers (films) are used. Specifically, polyethylene terephthalate (PET), polycarbonate, polyvinyl chloride, polystyrene, polypropylene, polyimide, celluloses (for example, triacetyl cellulose) or those films containing a pigment such as titanium oxide, and polypropylene. Film method synthetic paper made from etc., mixed paper made from synthetic resin pulp such as polyethylene and natural pulp, Yankee paper, baryta paper, coated paper (particularly Cascote paper), metal, cloth, glass, ceramic Etc. are used.

These can be used alone or
It can also be used as a support laminated on one or both sides with a synthetic polymer such as polyethylene. In addition, the supports described in JP-A-62-253159, pages (29) to (31) can be used. A hydrophilic binder, a semiconductive metal oxide such as alumina sol or tin oxide, carbon black, or another antistatic agent may be applied to the surface of these supports. For the purpose of improving the wettability of the coating liquid and the adhesion between the coating film and the support, gelatin, P
It is also preferable to pre-coat a polymer such as VA on the surface of these supports.

As a method for exposing and recording an image on a light-sensitive material, for example, a method of directly photographing a landscape or a person by using a camera, a method of exposing through a reversal film or a negative film by using a printer or an enlarger, A method of scanning and exposing an original image through a slit or the like using an exposure device of a copying machine, a method of exposing image information by emitting light from a light emitting diode or various lasers through an electric signal, a CRT, a liquid crystal display of image information, There is a method of outputting to an image display device such as an electroluminescence display and a plasma display, and exposing directly or through an optical system.

As a light source for recording an image on a photosensitive material,
As noted above, U.S. Pat. No. 4 for natural light, tungsten lamps, light emitting diodes, laser light sources,
The light source described in 50626, column 56 can be used.

Further, the image information is a video camera,
Image signals obtained from electronic still cameras, television signals represented by the Nippon Television Signal Standards (NTSC),
An image signal obtained by dividing an original image into a large number of pixels such as a scanner, and an image signal created using a computer represented by CG and CAD can be used.

In the present invention, water is used to accelerate the migration of the dye released during the development process (this water is referred to as dampening water in the present invention). That is, JP-A-59-21
As described in detail in No. 8443, No. 61-238056 and the like, development and transfer are carried out simultaneously or successively by heating in the presence of a small amount of solvent (particularly water). In this scheme,
The heat development temperature is preferably 50 ° C. or higher and 100 ° C. or lower. In this case, the amount of water used is equal to or less than the weight of water corresponding to the maximum swelling volume of the entire coating film of the light-sensitive material and the image receiving paper (especially from the weight of water corresponding to the maximum swelling volume of the entire coating film to the weight of the entire coating film). It can be as small as (less than or equal to the amount subtracted).

As a heating method in the developing and / or transferring step, a heated block or plate is brought into contact, or a hot plate, a hot presser, a heat roller, a halogen lamp heater, an infrared or far infrared lamp heater or the like is contacted. And passing through a high temperature atmosphere. Further, a resistive heating element layer may be provided on the photosensitive element or the dye fixing element, and the layer may be heated by being energized. As the heating element layer, those described in JP-A-61-145544 can be used.

A pressure condition and a method of applying pressure when the light-sensitive material and the image-receiving paper are superposed and brought into close contact are disclosed in JP-A-61-1.
The method described in page 47244 (27) can be applied.

Any of a variety of thermal development equipment can be used in processing the photographic elements of this invention. For example, JP-A-59-7
No. 5247, No. 59-177547, No. 59-181
No. 353, No. 60-18951, Shokai 62-259
An apparatus described in No. 44 or the like is preferably used.

[0108]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited to these.

Example 1 A method for preparing a zinc hydroxide dispersion will be described. 12.5 g of zinc hydroxide having an average particle size of 0.2 μm, 1 g of carboxymethyl cellulose as a dispersant, and 0.1 g of sodium polyacrylate were added to 100 ml of a 4% gelatin aqueous solution,
30 using glass beads with an average particle size of 0.75 mm in a mill
Milled for minutes. The glass beads were separated to obtain a dispersion of zinc hydroxide.

Next, a method for preparing a dispersion of the electron transfer agent will be described. 10 g of electron transfer agent (1), 0.5 g of polyethylene glycol nonylphenyl ether as a dispersant, and 0.5 g of anionic surfactant (1) were added to a 5% gelatin aqueous solution, and glass beads having an average particle size of 0.75 mm were milled. Was used for 60 minutes. The glass beads were separated to obtain a dispersion of the electron transfer agent having an average particle size of 0.35 μm.

[0111]

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[0112]

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Next, a method for preparing a dye trapping agent dispersion will be described. Polymer latex (1) (13% solid content)
108 ml, nonionic surfactant (1) 20 g, water 123
While stirring 2 ml of the mixed solution, 600 ml of a 5% aqueous solution of anionic surfactant (1) was added over 10 minutes. The dispersion thus prepared was concentrated and desalted to 500 ml using an ultrafiltration module. Then 1500ml
And the same operation was repeated once again to obtain 500 g of a dye trapping agent dispersion.

[0114]

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[0115]

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Next, a method for preparing a gelatin dispersion of the hydrophobic additive will be described. Cyan, magenta, yellow, and electron donor gelatin dispersions were prepared according to the formulations in Table 1, respectively. That is, each oil phase component was dissolved by heating at about 60 ° C. to form a uniform solution, and this solution and an aqueous phase component heated at about 60 ° C. were added, and the mixture was stirred and mixed, followed by a homogenizer for 13 minutes,
Dispersed at 12000 rpm. Water was added thereto and stirred to obtain a uniform dispersion.

[0117]

[Table 1]

[0118]

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[0119]

[Chemical 6]

[0120]

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[0121]

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[0122]

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[0123]

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[0124]

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[0125]

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[0126]

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[0127]

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Next, a method for preparing a photosensitive silver halide emulsion will be described.

Photosensitive Silver Halide Emulsion (1) [For red-sensitive emulsion layer] Well-stirred aqueous gelatin solution (20 g of gelatin in 480 ml of water, 0.5 g of potassium bromide, 3 parts of sodium chloride).
g and 30 mg of silver halide solvent (1) were added, and the temperature was 45 ° C.
The solution (I) and the solution (II) shown in Table 2 were simultaneously added to the sample (which was kept warm) at a constant flow rate for 20 minutes. After 5 minutes, (III) in Table 2
Solution and (IV) solution were added simultaneously at the same flow rate for 25 minutes. Also (I
II), 10 minutes after the addition of the solution (IV), an aqueous solution of a gelatin dispersion of the dye (containing 105 g of water, 1 g of gelatin, 70 mg of the dye (1), 139 mg of the dye (2), and 5 mg of the dye (3) at 45 ° C.) Which was kept warm) was added over 20 minutes.

After washing with water and desalting by a conventional method, 22 g of lime-treated ossein gelatin was added to adjust pH to 6.2 and pAg to 7.7, and 4.1 mg of sodium thiosulfate and 4-hydroxy-6-methyl were added. Add 1,250 mg of -1,3,3a, 7-tetrazaindene and 1.8 mg of chloroauric acid, and add 60 ° C.
Optimally chemically sensitized with, then antifoggant (3) 200
After adding mg, the mixture was cooled. Thus, 635 g of a monodisperse cubic silver chlorobromide emulsion having an average grain size of 0.30 μm
I got

[0131]

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[0132]

[Table 2]

[0133]

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Photosensitive silver halide emulsion (2) [for red-sensitive emulsion layer] An aqueous solution of well-stirred gelatin (in 783 ml of water, 20 g of gelatin, 0.5 g of potassium bromide and 6 parts of sodium chloride).
and 30 mg of silver halide solvent (1) were added, and the mixture was heated to 65 ° C.
The solution (I) and the solution (II) shown in Table 3 were simultaneously added to the sample (which was kept warm) at an equal flow rate for 30 minutes. After 5 minutes, (III) in Table 3
Solution and (IV) solution were added simultaneously at an equal flow rate for 15 minutes. Also (I
II), 2 minutes after the start of the addition of solution (IV), an aqueous solution of a gelatin dispersion of dye (containing 0.9 g of gelatin, 76 mg of dye (1), 150 mg of dye (2), and 5 mg of dye (3) in 95 ml of water) (Incubated at 50 ° C.) was added over 18 minutes.

After washing with water and desalting by a conventional method, 22 g of lime-treated ossein gelatin was added to adjust pH to 6.2 and pAg to 7.8, and 2.8 mg of sodium thiosulfate and 4-hydroxy-6-methyl were added. Add 175 mg of -1,3,3a, 7-tetrazaindene and 1.2 mg of chloroauric acid, and add 60 ° C.
Chemistry optimally with, then antifoggant (2) 163mg
And then cooled. Thus, 635 g of a monodispersed cubic silver chlorobromide emulsion having an average grain size of 0.50 μm was obtained.

[0136]

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[0137]

[Table 3]

Photosensitive Silver Halide Emulsion (3) [For Green Sensitive Emulsion Layer] Well-stirred aqueous gelatin solution (20 g of gelatin, 0.5 g of potassium bromide, 4 g of sodium chloride in 690 ml of water).
g and 15 mg of silver halide solvent (1) were added, and the temperature was 48 ° C.
The solution (I) and the solution (II) shown in Table 4 were simultaneously added to the sample (which was kept warm) at a constant flow rate for 8 minutes. 10 minutes later (III) in Table 4
Solution and (IV) solution were added simultaneously at the same flow rate for 32 minutes. Also (I
II), 1 minute after the addition of the solution (IV), an aqueous solution of a gelatin dispersion of a dye (2.5 g of gelatin and 250 mg of the dye (4) in 100 ml of water and kept at 45 ° C.) was added all at once. .

After washing and desalting in the usual way, 20 g of lime-treated ossein gelatin was added to adjust the pH to 6.0 and pAg to 7.6, and sodium thiosulfate 9.4 mg and 4-hydroxy-6-methyl were added. Add 263 mg of -1,3,3a, 7-tetrazaindene and optimally perform chemical sensitization at 68 ° C,
After adding 163 mg of the antifoggant (2), the mixture was cooled.
Thus, 635 g of a monodisperse cubic silver chlorobromide emulsion having an average grain size of 0.27 μm was obtained.

[0140]

[Table 4]

[0141]

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Photosensitive Silver Halide Emulsion (4) [For Green Sensitive Emulsion Layer] Well-stirred aqueous gelatin solution (20 g of gelatin, 0.3 g of potassium bromide and 6 g of sodium chloride in 700 ml of water).
g and 15 mg of silver halide solvent (1) are added, and the temperature is 55 ° C.
The solution (I) and the solution (II) shown in Table 5 were simultaneously added to the sample (which was kept warm) at an equal flow rate for 20 minutes. After 10 minutes, (II in Table 5
Solution (I) and solution (IV) were added simultaneously at an equal flow rate for 20 minutes. In addition, 1 minute after the addition of the solutions (III) and (IV), an aqueous solution of a gelatin dispersion of a dye (a mixture of 1.8 g of gelatin and 180 mg of the dye (4) in 95 ml of water and kept at 45 ° C.) was collectively added. Was added.

After washing with water and desalting by a conventional method, 20 g of lime-treated ossein gelatin was added to adjust pH to 6.0 and pAg to 7.6, and 1.0 mg of sodium thiosulfate and 4-hydroxy-6-methyl were added. -1,3,3a, 7-Tetrazaindene (46 mg) and chloroauric acid (0.6 mg) were added for optimum chemical sensitization at 68 ° C, and then an antifoggant (2) 163 m.
After adding g, it was cooled. Thus, 635 g of a monodisperse cubic silver chlorobromide emulsion having an average grain size of 0.45 μm
I got

[0144]

[Table 5]

Photosensitive Silver Halide Emulsion (5) [For blue-sensitive emulsion layer] Well-stirred aqueous gelatin solution (20 g of gelatin, 0.5 g of potassium bromide, 5 g of sodium chloride in 690 ml of water).
g and 15 mg of silver halide solvent (1) were added, and the temperature was 51 ° C.
The solution (I) and the solution (II) shown in Table 6 were simultaneously added to the sample (which was kept warm) at an equal flow rate for 8 minutes. After 10 minutes, (III) in Table 6
Solution and (IV) solution were added simultaneously at the same flow rate for 32 minutes. Also (I
One minute after the addition of the solutions (II) and (IV) is completed, an aqueous solution of the dye (water 95
The dye (5) (220 mg) and the dye (6) (110 mg), which were kept warm at 45 ° C., were added all at once to 100 ml of methanol and 5 ml of methanol.

After washing with water and desalting by a conventional method, 22 g of lime-treated ossein gelatin was added to adjust pH to 6.0 and pAg to 7.8, and sodium thiosulfate 4.8 mg and 4-hydroxy-6-methyl were added. Add 1,3,3a, 7-tetrazaindene (250mg) and optimally chemically sensitize at 68 ° C.
Next, 163 mg of antifoggant (2) and 94 mg of potassium iodide were added, and the mixture was cooled. Thus, a monodisperse cubic silver chlorobromide emulsion 6 having an average grain size of 0.30 μm
35 g were obtained.

[0147]

[Table 6]

[0148]

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Photosensitive Silver Halide Emulsion (6) [For Blue Sensitive Emulsion Layer] Well stirred gelatin aqueous solution (20 g of gelatin, 0.3 g of potassium bromide and 9 g of sodium chloride in 695 ml of water).
g and 15 mg of silver halide solvent (1) were added, and the temperature was 63 ° C.
The solution (I) and the solution (II) shown in Table 7 were simultaneously added to the sample (which was kept warm) at an equal flow rate for 10 minutes. After 10 minutes, (II in Table 7
Solution (I) and solution (IV) were added simultaneously at the same flow rate for 30 minutes. One minute after the addition of the solutions (III) and (IV), an aqueous solution of the dye (66 mg of water and 4 ml of methanol, containing 155 mg of the dye (5) and 78 mg of the dye (6) and kept at 60 ° C.) was put together. Added.

After washing and desalting in the usual way, 22 g of lime-treated ossein gelatin was added to adjust pH to 6.0 and pAg to 7.8, and 1.6 mg of sodium thiosulfate and 4-hydroxy-6-methyl were added. Addition of 95 mg of -1,3,3a, 7-tetrazaindene and 0.31 mg of chloroauric acid at 68 ° C
Optimally chemically sensitized with, then antifoggant (2) 163
After adding mg and potassium iodide 94 mg, it cooled. Thus, 635 g of a monodispersed cubic silver chlorobromide emulsion having an average grain size of 0.55 μm was obtained.

[0151]

[Table 7]

A light-sensitive material D shown in Table 8 using the above materials
Made 101.

[0153]

[Table 8]

[0154]

[Table 9]

[0155]

[Table 10]

[0156]

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[0157]

[Chemical 21]

[0158]

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Next, a method of making the image receiving material will be described. Image-receiving materials R101 having the configurations shown in Tables 11 and 12 and Table 1
The image receiving material R102 having the structure shown in FIG.

[0160]

[Table 11]

[0161]

[Table 12]

[0162]

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[0163]

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[0164]

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[0165]

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[0166]

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[0167]

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[0168]

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[0169]

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[0170]

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[0171]

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[0172]

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[0173]

[Table 13]

Next, in the support (2) of Table 11 used in the image receiving material R101, by coating the hydrophobic polymer layer shown in Table 14 instead of removing the front and back PE layers and the undercoat layer. , Image receiving material R10 in Table 15
3-114 were created. Here, the image receiving materials R103 to 11
3 uses the same kind of hydrophobic polymer on the front surface and the back surface,
In addition, it was prepared by reducing the coating amount of the hydrophobic polymer on the back surface so that the water vapor transmission rate shown in Table 15 was obtained. The water vapor permeability was measured by the method described in JIS-Z-0280. However, since it is difficult to take out and measure the hydrophobic polymer film having the thickness of the present invention, the measurement is performed using a sample in which a hydrophobic polymer layer to be measured is coated on one side of the same base paper, and the ratio thereof is Rb / Used as Rf.

[0175]

[Table 14]

[0176]

[Table 15]

The above light-sensitive material D101 and image-receiving material R10
1 to R114 were processed using the image recording apparatus described in JP-A-2-84634. That is, a full-color original image is scanned and exposed through a slit, and the exposed photosensitive material is exposed to 40
After immersing in water kept at ℃ for 2.5 seconds, it was squeezed with a roller and immediately superposed so that the image receiving material and the film surface were in contact with each other.
Then, using a heat drum whose temperature was adjusted so that the temperature of the water-absorbed film surface became 80 ° C., the photosensitive material was peeled off from the image receiving material by heating for 17 seconds, and a clear color image corresponding to the original image was obtained on the image receiving material. Was done.

Next, the A4 size color print prepared by the above method was left in the environment of 25 ° C. and 55% Rh for half a day or more, then transferred to the environment of 25 ° C. and 20% Rh, and the curling after 1 hour was measured. The measurement results are also shown in Table 15. The measured values are obtained by placing the above-mentioned color print on a smooth table and measuring the lifting heights of the four corners in mm units and averaging them. The numerical values in Table 15 represent the size of curling with the image receiving layer surface inside. From the results shown in Table 15, it is understood that the image receiving material of the present invention can provide a color print with less curling even at low humidity. Here, the image receiving material R107 showed a tendency that the curling was gradually improved when it was left for a long time. It is considered that this is because the hydrophobic polymer layer on the back surface was too thick and the water permeation rate to the base paper portion was reduced. Similarly, the image receiving material R114 has a hydrophobic polymer layer only on the front side of the base paper, and the degree of low-humidity curling is slightly preferable as compared with the image receiving material R113, and the writing property on the back surface is excellent. As a matter of course, since R114 does not have water resistance on the back surface, it is necessary to properly use these two types of image receiving materials of the present invention as needed. Next, with respect to the support of the image receiving material R102 shown in Table 13, the same hydrophobic polymer layer as that of R103 to R114 was applied and tested.
The same result was obtained.

Example 2 An instant print system manufactured by Fuji Photo Film Co., Ltd., a Pictrostat 330 (PS330) apparatus was used.
When a print was made using the dedicated light-sensitive material PS donor (PS-3DS) and the image receiving materials R101 to 114 of Example 1 and curling was measured, the image receiving material of the present invention was curled in a low humidity environment as in Example 1. And good results were obtained.

Example 3 A method for preparing the emulsion (7) will be described. (Emulsion for Fifth Layer) Solution I and solution II having the composition shown in Table 17 were simultaneously added over 15 minutes to an aqueous solution having the composition shown in Table 16 which was well stirred, and then the composition shown in Table 17 was added. Liquid III and IV 3
Added over 5 minutes.

[0181]

[Table 16]

[0182]

[Table 17]

Further, from 18 minutes after the start of addition of the liquid III,
75cc of 0.5% methanol solution of dye (7) over a period of time
Was added. Washing with water, desalting (using the precipitating agent (1), pH =
4.1) and then add 22 g gelatine to pH
= 6.0, pAg = 7.9, and then chemically sensitized at 60 ° C. The compounds used for chemical sensitization are as shown in Table 18. The yield of the obtained emulsion was 630 g, which was a monodisperse cubic emulsion having a grain size variation coefficient of 10.2%, and the average grain size was 0.31 micrometer.

[0184]

[Table 18]

[0185]

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[0186]

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The method for preparing the emulsion (8) will be described. (Emulsion for Third Layer) Solution I and solution II having the composition shown in Table 20 were simultaneously added to an aqueous solution having the composition shown in Table 19 for 10 minutes, and the composition shown in Table 20 was then added. Liquid III and IV 4
Added over 5 minutes.

[0188]

[Table 19]

[0189]

[Table 20]

After washing with water and desalting (the compound represented by the precipitating agent (1) was used at pH = 3.9), 12 g of gelatin was added to pH = 5.9 and pAg = 7.8. Then, it was chemically sensitized at 70 ° C. At the end of the chemical sensitization, 42 g of a gelatin dispersion of dye (8) (gelatin 5%, sensitizing dye 0.5%) was added. The compounds used for the chemical sensitization are shown in Table 21. The yield of the obtained emulsion was 645 g, which was a monodisperse cubic emulsion having a grain size variation coefficient of 12.6%, and the average grain size was 0.32 micrometer.

[0191]

[Table 21]

[0192]

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A method for preparing the emulsion (9) will be described. (Emulsion for first layer) Solution I and solution II having the composition shown in Table 23 were simultaneously added over 15 minutes to an aqueous solution having the composition shown in Table 22 which was well stirred, and then the emulsion having the composition shown in Table 23 was added. Solution III and IV solution 2
Added over 5 minutes.

[0194]

[Table 22]

[0195]

[Table 23]

Further, after washing with water and desalting (performed with the compound represented by the precipitating agent (1) at pH = 3.8), 20 g of gelatin was added to pH = 6.6 and pAg = 8.0. Then, it was chemically sensitized at 58 ° C. At the end of the chemical sensitization, 42 g of a gelatin dispersion of dye (9) (gelatin 5%, sensitizing dye 1%) was added. The compounds used for the chemical sensitization are shown in Table 24. The yield of the obtained emulsion was 650 g, which was a monodisperse cubic emulsion having a coefficient of variation of 9.7%, and the average grain size was 0.22 micrometer.

[0197]

[Table 24]

[0198]

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Next, a method for preparing a gelatin dispersion of the dye-donor compound will be described. Magenta dye donating compound (2) 14.64 g, reducing agent (1) 0.8 g, antifoggant (4) 0.20 g, anionic surfactant (2) 0.
4 g and 5.1 g of high boiling point solvent (2) were weighed, and ethyl acetate 7
0 ml was added and dissolved by heating at about 60 ° C. to obtain a uniform solution. This solution, 71 g of a 14% lime-processed gelatin solution, and 220 cc of water were mixed by stirring, and then dispersed by a homogenizer at 10,000 rpm for 10 minutes. This dispersion is referred to as a dispersion of a magenta dye-donor compound.

[0200]

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7.3 g of the cyan dye-donating compound (3),
Cyan dye donating compound (4) 10.6 g, reducing agent (1) 1.0 g, antifoggant (4) 0.30 g, anionic surfactant (2) 0.4 g, high boiling point solvent (2) 9.
8 g was weighed, 40 ml of ethyl acetate was added, and the mixture was heated and dissolved at about 60 ° C. to obtain a uniform solution. After stirring and mixing this solution with 71 g of a 14% solution of lime-processed gelatin and 260 cc of water,
Disperse with a homogenizer at 10,000 rpm for 10 minutes. This dispersion is referred to as a dispersion of a cyan dye-donor compound.

[0202]

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Yellow dye-donor compound (2) 18.8
g, reducing agent (1) 1.0 g, antifoggant (4) 0.1
3 g, anionic surfactant (2) 1.5 g, dye (1)
2.1 g and 7.5 g of the high boiling point solvent (2) were weighed, 45 ml of ethyl acetate was added, and the mixture was heated and dissolved at about 60 ° C. to obtain a uniform solution. 71% of this solution and 14% of lime-processed gelatin
g and 160 cc of water by stirring and mixing, and then 1 with a homogenizer
Dispersed for 0 minutes at 10,000 rpm. This dispersion is referred to as a yellow dye-donor compound dispersion.

[0204]

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From these, a light-sensitive material D201 having the constitution shown in Tables 25 and 26 was formed.

[0206]

[Table 25]

[0207]

[Table 26]

[0208]

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[0209]

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[0210]

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[0211]

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[0212]

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The high boiling point solvent (5) is triisononyl phosphate. A method for preparing a dispersion of zinc hydroxide will be described. 12.5 g of zinc hydroxide having an average particle size of 0.15 μm, 1 g of carboxymethyl cellulose as a dispersant, and 0.1 g of sodium polyacrylate are added to 100 ml of a 4% gelatin aqueous solution, and glass beads having an average particle size of 0.75 mm are milled. Was crushed for 30 minutes. The glass beads were separated to obtain a dispersion of zinc hydroxide.

Next, evaluation was carried out by the following exposure and processing. Japanese Patent Application Nos. 63-281418 and 6) for the above light-sensitive material.
Using the laser exposure apparatus described in 3-204805,
Exposure was performed under the conditions shown in Table 27. Exposed photosensitive material D20
(1) After supplying dampening water to the emulsion surface with a wire bar, the emulsion was superposed so that the image receiving materials R101 to R109 of Example 1 were in contact with the film surface, and the temperature was adjusted so that the temperature of the absorbed film was 85 ° C. After heating with a roller for 30 seconds,
The image receiving material was peeled off from the photosensitive material to obtain an image on the image receiving material.

[0215]

[Table 27]

When the curling characteristics of the color print thus produced were measured, good results were obtained with less curling in a low humidity environment with the image receiving material of the present invention as in Example 1.

Example 4 Pictrography 3000 manufactured by Fuji Photo Film Co., Ltd.
(PG3000) device, special sensitive material PG donor (PG
-D) and prints were made using the image receiving materials R101 to 114 of Example 1, and curling was measured. As with Example 1, the image receiving material of the present invention gave good results with less curling in a low humidity environment. Was given.

Example 5 In the support (2) of Table 9 used in the image receiving material R101 of Example 1, the hydrophobic polymer layer shown in Table 28 was used instead of removing the PE layer and the backside undercoat layer on the front and back sides. By coating the image receiving material R115 of Table 29.
~ 121 was created.

[0219]

[Table 28]

[0220]

[Table 29]

The results of curling evaluation of the obtained print are shown in Table 29 in the same manner as in Example 1 except that the above image receiving material is used. From these results, it can be seen that by using the image receiving material of the present invention, it is possible to obtain a good color print having good curling characteristics even when the humidity of the environment changes. Next, for the image receiving material 102 of Example 1, curling properties were obtained by applying the hydrophobic polymer layer shown in Table 28 instead of removing the PE layer and the backside undercoat layer on the front and back surfaces of the support (2). As a result, the same effect was obtained.

[0222]

As described above, by using the image receiving material of the present invention, it is possible to obtain a good color print having good curling characteristics even if the humidity of the environment changes.

Claims (6)

[Claims] 1. A heat-development color image forming method for forming a color image on the image-receiving layer of an image-receiving paper by applying dampening water to the surface of the photosensitive layer of the heat-developable color light-sensitive material, and then heating the image-receiving paper in an overlapping manner. In the image receiving paper used for, the support of the image receiving paper has at least one hydrophobic polymer layer on each side of the base paper, and the water vapor transmission rate Rb of the hydrophobic polymer layer on the back side as viewed from the side where the image receiving layer is provided, Ratio Rb / Rf to the moisture permeability Rf of the hydrophobic polymer layer on the side (front side) where the image receiving layer is provided
A heat-developable color image-forming image-receiving paper, characterized in that 2. The image-receiving paper for heat-developable color image formation according to claim 1, wherein the hydrophobic polymer layer is made of an acrylic resin. 3. The heat-developable color image-forming image-receiving paper according to claim 1, wherein the solid coating amount of the front hydrophobic polymer layer is 5 g or more and 20 g or less per 1 m ² . 4. A heat-development color image forming method for forming a color image on the image-receiving layer of the image-receiving paper by applying dampening water to the surface of the photosensitive layer of the heat-developable color-sensitive material, and then heating the image-receiving sheet in superposition. An image-receiving paper for heat-development color image formation, wherein the paper support of the image-receiving paper has at least one hydrophobic polymer layer only on the side of the base paper on which the image-receiving layer is provided. 5. The solid coating amount of the hydrophobic polymer layer is 1
The image receiving paper for heat-developable color image formation according to claim 4, which is 5 g or more and 20 g or less per m ² . 6. The image-receiving paper for heat-developable color image formation according to claim 4, wherein the hydrophobic polymer layer is made of an acrylic resin.