JPS62108249A - Image forming method - Google Patents

Abstract

PURPOSE:To give a high density and low fog image and to improve the shelf stability by producing a mobile base by the reaction of an immobilized strong base with a water soluble neutral salt in the presence of water. CONSTITUTION:The immobilized strong base is >=15C water insoluble org. strong base or a polymerized strong base. The immobilized strong base may be amidines, guanidines or the hydroxide of a quat. ammonium salt made insoluble in water by the introduction of a ballast group or immobilized by polymn. The water soluble neutral salt may be an alkali metallic halide or sulfate, guanidine hydrochloride or sulfate. An image forming method by which a high density and low fog image with superior shelf stability is given by easy processing is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION BACKGROUND OF THE INVENTION Technical Field The present invention relates to a method for forming an image, and more particularly to a method for forming a dye image by heating in an alkaline atmosphere.

Prior art and its problems Photography using silver halide has traditionally been the most popular method because it has superior photographic properties such as sensitivity and gradation control compared to other photographic methods, such as electrophotography and diazo photography. Widely used. In recent years, a technology has been developed that allows images to be easily and quickly obtained by changing the image forming method for photosensitive materials using silver halide from the conventional wet processing using a developing solution to a dry processing using heating, etc. has been done.

Heat-developable photosensitive materials are well known in this technical field, and for information on heat-developable photosensitive materials and their processes, see, for example, Fundamentals of Photographic Engineering (published by Corona Publishing, 1979), pages 553-555.
Page, April 1978 issue video information page 40, Nebletts Handbook on Photography Andre Program 7 E (Nebletts Handbook
ofPhotography and Reprog
raphy) 7th Edition (7thEd,) Van Nostrand Reinhold Company (Van No5t
32 of rand Re1nhold Compan7)
~32 pages, U.S. Patent No. 3,152,904, No. 3,
No. 301,678, No. 3,392.020, No. 3
, 457,075, British Patent No. 1.131.108, British Patent No. 1,167.777, and Research Disclosure Magazine, June 1978 issue, pages 9-15 (RD-
17029).

Regarding how to obtain color images by heat development,
Many proposals have been made. U.S. Patent No. 3,531,
No. 286, No. 3,761.270, No. 4.021
, No. 240, Belgian Patent No. 802,519, Research Disclosure Magazine, September 1975 issue, pages 31 and 32, etc., there is a method for forming a color image by combining an oxidized form of a developer with a coupler, and various methods used therein. Developers are listed.

In addition, a method of introducing a nitrogen-containing heterocyclic group into a dye, forming a silver salt, and releasing the dye by heat development is described in Research Disclosure magazine, May 1978 issue, pages 54-58 (RD-
16968).

Regarding the method of forming positive color images by thermal silver dye bleaching method, for example, see Research Disclosure Magazine, April 1976 issue, pages 30-32 (RD-14433).
), December 1976 issue, pages 14-15 (RD-15
227) and U.S. Pat. No. 4,235,957, useful methods for bleaching dyes are described.

Further, methods for forming color images using leuco dyes are described in, for example, US Pat. No. 3,985.565 and US Pat. No. 4,022,617.

However, in these color image forming methods, during long-term storage of the formed color image, discoloration and coloring of the white background occur due to coexisting silver halide, silver complex, developer, etc. A new method of forming a color image by heat development, which improves these drawbacks, is disclosed in JP-A-57-179840, JP-A No. 57-186774,
No. 57-198458, No. 57-207250, No. 58-58543, No. 58-79247, No. 58-
No. 116537, No. 58-149046, No. 59-4
No. 8764, No. 59-65839, No. 59-7104
No. 6.

It is described in No. 59-87450, No. 59-88730, etc.

These occur when photosensitive silver halide and/or organic silver salts are reduced to silver by heat development.

In this method, a mobile dye is generated or released in response to or inversely to this reaction, and the mobile dye is transferred to a dye-fixing element.

By the way, in order to develop a photosensitive material, it is generally desirable to increase the pH of the reaction system.

However, when a highly alkaline substance is contained in a light-sensitive material, problems tend to occur in terms of storage stability, and when it is contained in an image-receiving material, problems such as accelerated hydrolysis of gelatin occur. Furthermore, a substance that changes the pH is added to the water supplied from the outside during transfer and development. In this case, there are many inconveniences in terms of storage and handling.

II. OBJECTS OF THE INVENTION An object of the present invention is to provide an image forming method that provides images with high density and low capri, has excellent storage stability, and is easy to process.

■Disclosure of invention These objects are achieved by the invention described below.

That is, 1 the present invention provides an image forming reaction system containing an immobilized strong base and a neutral water-soluble salt, in the presence of water,
This is an image forming method characterized by generating a mobile base through a reaction between the above two compounds.

■Specific structure of the invention Hereinafter, a specific configuration of the present invention will be explained in detail.

In the image forming method of the present invention, an immobilized strong base and a neutral water-soluble salt are included in the image forming reaction system, and in the presence of water, the above two compounds undergo a reaction to make them mobile. The base is generated.

The image forming reaction system in the present invention means a region where one image forming reaction occurs. Specifically, examples thereof include a layer existing on a support of a photosensitive material, or, when a photographic element includes a photosensitive element and an image receiving element, a layer belonging to both elements. If there are two or more layers, all or one layer may be used.

In the present invention, the water used as a medium can be supplied by a method of supplying water from the outside, a method of pre-existing a capsule containing water in the image forming reaction system, and a method of destroying the capsule by heating etc. and supplying water. can.

The immobilized strong base used in the present invention has 15 carbon atoms.
Refers to any of the above water-insoluble organic strong bases and polymerized strong bases.

Specifically, examples thereof include amidines, guanidines, quaternary ammonium salt hydroxides, etc. which have been immobilized by introducing a ballast group and making them insoluble in water or by polymerization.

Specific examples of such immobilized strong bases are shown below.

(?) (8) Neutral water-soluble salts used in the present invention include 1, for example, alkali metal halogen salts (e.g. NaCl, KCI, NaBr
'$), alkali metal sulfates (e.g. Na2 SO4
, Ni2 S04, etc.), hydrochlorides or sulfur salts of guanidines (e.g.

etc).

Examples include hydrochloride or sulfate of amidines (for example, Ju, etc.), and the anions constituting these salts have a photographic shape! A mobile base is produced by an equilibrium reaction between an immobilized strong base of 6 or more and a neutral water-soluble base (e.g., chloride ion, sulfate ion, phosphate ion, etc.). Ru.

Using Exemplified Compound (16) as the immobilized strong base and NaCJL as the neutral water-soluble salt, the reaction and formula are as follows.

Such a reaction has conventionally been applied to F' such as ion exchange resins, but in the present invention it is applied to a method for forming an iris.

Examples of combinations of immobilized strong bases and neutral water-soluble salts preferably used in the present invention are listed below.

10.

These combinations can be used alone or in combination of two or more. It can also be used in combination with a known base or base precursor.

The guanidines used in the present invention are manufactured by Brittempla Sochete de France (Bull, Société de France).
c, Chim, France), 1985 (12
), 3894 pages, Journal of Medicinal Chemistry (J, Med, Ches.), 8(5)
, p. 587 (1983), Bull, Ch.
e+m, 5oclapan), 47, p. 935 (1974), Journal on the Chemical Society 4 (J, Che+*, Soc,).

1963.240 pages, Tetrahedron Letters (Te
trahedron Lett, ), 19Ei8, 17
It was synthesized according to the instructions on page 1 etc.

Further, the immobilized strong base 1 was synthesized, for example, as follows.

2-Methyl-3,4,5 in acetonitrile loOmi
, 6-tetrahydrobyrimidine [Journal on the Chemical Society! (J, Chem, Soc,
), 1982, p. 4039] and 15.3 g of chloromethylstyrene (meta-para isomer mixture, containing t-butyl caterol) were added at room temperature and reacted for 2 hours. After evaporating the solvent, the residue was washed three times with 50 mL of ethyl acetate to remove t-butylcatechol. 100mM of methanol was added to the residual solution, 20mJl of a 28% methanol solution of sodium methoxide was added, and then 120mJl of isopropyl alcohol was added, and the precipitated common salt was separated. Concentrate solution I, add 130 mJL of ethanol to the residue, and add 2,2'-azobis (2°4
After adding 0.12 g of -dimethylvaleronitrile),
The mixture was heated under reflux for 3 hours under a nitrogen stream.

0.12 g of 2.2'-azobis(2,4-dimethylvaleronitrile) was added again, and the mixture was further refluxed for 3 hours. After filtering the reaction solution and distilling off the ethanol, water was added and the precipitated solid matter was separated from P, thoroughly washed with water, and dried.

The yield was 18.2g.

In the present invention, the immobilized strong base and neutral water-soluble salt are preferably contained in at least one layer on separate supports.

For example, it is preferable that the immobilized strong base is contained in the light-sensitive material and the neutral water-soluble salt is contained in the image-receiving material.
Neutral water-soluble salts may be supplied dissolved in the water involved; immobilized strong bases are disclosed in JP-A-59-174.
830, No. 53-102733, etc., and the average particle size thereof is 50. Below, 5 or less is particularly preferable.

In the present invention, when an immobilized strong base or a neutral water-soluble salt is contained in a layer on a support, the addition characteristics are determined by the chemical activity, the particle size of the immobilized base, and the distance between the two compounds. Although it depends on the reaction rate of each coating film, it is appropriate to use the coating film in an amount of 50% by weight or less, more preferably in the range of o, oi to 40% by weight. In addition, when supplying a neutral water-soluble salt by dissolving it in the water involved, 0.005mou/u to 5mou/u
A concentration of mol/l is preferred, especially 0.05 m
The concentration of the neutral water-soluble salt in the reaction system is preferably 1/1 to the content of the immobilized strong base in the present invention. 100 times to 100 times, especially l/10 times to 2
0 times is preferable.

Silver halides that can be used in the present invention include silver chloride, silver bromide,
Alternatively, silver chlorobromide, silver chloroiodide, or silver chloroiodobromide may be used.

Specifically, pages 35 to 36 of Japanese Patent Application No. 59-228551.
Page, U.S. Patent No. 4,500.626, No. 50, Research Disclosure Magazine, June 1978, pp. 9-1
Any of the silver halide emulsions described on page O (RD17029) etc. can be used.

Silver halide emulsions may be used as they are after ripening, but they are usually used after being chemically sensitized. For emulsions for conventional light-sensitive materials, known sulfur sensitization methods, reduction sensitization methods, noble metal sensitization methods, etc. can be used alone or in combination. These chemical sensitizations can also be performed in the presence of nitrogen-containing heterocyclic compounds (
JP 58-126526, JP 58-215644).

The silver halide emulsion used in the present invention may be a surface latent image type in which a latent image is mainly formed on the grain surface, or an internal latent image type in which a latent image is formed inside the grains. Direct inversion emulsions combining emulsions and nucleating agents can also be used.

The coating amount of the photosensitive silver halide used in the present invention ranges from Lmg to log/m'' in terms of silver.

In the present invention, an organic metal salt can also be used as an oxidizing agent together with photosensitive silver halide. In this case, the photosensitive halogenated steel and the organic metal salt need to be in contact or at a close distance.

Among such organic metal salts, organic silver salts are particularly preferably used.

Examples of organic compounds that can be used to form the above-mentioned organic silver salt oxidizing agent include Japanese Patent Application No. 59-228551, page 37-
39 pages, U.S. Patent No. 4°500, 626% i52a
There are compounds of D. Jl such as ~m53a. Also special request
Also useful are silver salts of carboxylic acids having a furkynyl group, such as silver phenylpropiolate described in No. 8-221535.

The above organic silver salts can be used in combination in an amount of 0.01 to 10 mol, preferably 0.01 to 1 mol, per mol of photosensitive halide IR. The total coating amount of photosensitive silver halide and organic silver salt is 50B to log/rn'
is appropriate.

The silver halide used in the present invention may be spectrally sensitized with methine dyes and others.

The dyes used include cyanine dyes, merocyanine dyes, complex cyanine dyes, complex merocyanine dyes, holopolar cyanine dyes, hemicyanine dyes, styryl dyes and hemioxonol dyes.

Specifically, Japanese Patent Publication Nos. 59-180550 and 60-1
No. 40335, Research Disclosure Magazine, 19
Sensitizing dyes described in June 1978 issue, pages 12-13 (RD17029), JP-A No. 60-111239, Japanese Patent Application No. 1983
Examples include thermally decolorizable sensitizing dyes described in No. 0-172967 and the like.

These sensitizing dyes may be used alone or in combination, and combinations of sensitizing dyes are often used particularly for the purpose of supersensitization.

Along with sensitizing dyes, dyes that do not themselves have spectral sensitizing effects or substances that do not substantially absorb visible light, 1
Substances exhibiting supersensitization may also be included in the emulsion (e.g., U.S. Pat. Nos. 2.933.390 and 3.835,72).
No. 1, No. 3,743.510, No. 3, 615
.

No. 613, No. 3,615,641, No. 3.617
, No. 295, and No. 3,635,721)
.

These sensitizing dyes may be added to the emulsion during or before or after chemical ripening.
It may be carried out before or after nucleation of silver halide grains according to No. 756 and No. 4,225.666.

The amount added is generally about 1o-8 to 1o-2 mol per mol of silver halide.''In the present invention,
Silver can be used as the image forming material. Furthermore, when photosensitive silver halide is reduced to silver under high temperature conditions, a compound that generates or releases a mobile color powder, that is, a dye-donating substance, can be produced in response to or inversely to this reaction. It can also contain.

Next, the dye-donating substance will be explained.

Examples of dye-donating substances that can be used in the present invention include couplers that can react with a developer. This method using a coupler, in which an oxidized product of the developer produced by an oxidation-reduction reaction between a silver salt and a developer reacts with the coupler to form a dye, is described in numerous documents. Specific examples of developers and couplers can be found in James, The Theory on the Photographic Process, 4th Edition (T,) 1. Jaaes
”The Theor7 of the Photo-
291~3
34 pages and 354 to 361 pages, JP-A-58-12
No. 3533, No. 58-149046, No. 58-149
No. 047, No. 59-111148, No. 59-1243
No. 39, No. 59-174835, No. 59-23153
No. 9, No. 59-231540, No. 60-2950,
No. 60-2951, No. 60-14242, No. 60-
It is described in detail in No. 23474, No. 60-66249, etc.

Further, a dye silver compound in which a 411 silver burial mound and a dye are combined can also be cited as an example of the dye-donating substance. Specific examples of dye silver compounds are given in Research Disclosure Magazine 1978.
It is described in May issue, pages 54-58 (RD-16966).

Furthermore, azo dyes used in heat-developable silver dye bleaching methods can also be cited as examples of dye-donating substances. Specific examples of azo dyes and bleaching methods are disclosed in U.S. Patent No. 4.235.957.
No., Research Disclosure Magazine, April 1976 issue, pages 30-32 (RD-14433).

Also, U.S. Patent No. 3.985.565, U.S. Patent No. 4,02
Leuco dyes described in No. 2,617 and the like can also be cited as examples of dye-donating substances.

Another example of the dye-donating substance is a compound that has the function of releasing or diffusing a diffusible dye in an imagewise manner.

This type of compound can be represented by the following general formula (LI).

(Dye-X)n-Y (LI) Dye represents a dye group, a temporarily shortened dye group or a dye precursor group, X represents a wide bond or a linking group, and Y represents Mj Correspondingly or inversely to the image-bearing photosensitive silver salt, a difference is created in the diffusivity of the compound represented by (Dye-X)n-Y, or Dye is released, and the released Dye and (Dye -X) n - Represents a group that has the property of causing a difference in diffusivity between Y and n, where n is! or 2, and when n is 2, the two Dye-Xs may be the same or different.

As a specific example of the dye-donating substance represented by the general formula (LI), for example, a dye developer in which a hydroquinone developer and a dye component are linked is disclosed in US Pat. No. 3,134,769.
No. 3゜362.819, No. 3.597.20
No. 0, No. 3.544.545, No. 3,482.9
It is described in No. 72, etc. In addition, a substance that releases a diffusible dye through an intramolecular nucleophilic substitution reaction was disclosed in JP-A-51-6
3,618, etc., a substance that releases a diffusible dye through an intramolecular rewinding reaction of the inoxacilone ring was disclosed in JP-A No. 4.
No. 9-111.628, etc. In all of these methods, the diffusible dye is released or diffused in areas where development has not occurred, and the dye is neither released nor diffused in areas where development has occurred.

Another method is to make the dye-releasing compound into an oxidized form that does not have dye-releasing ability, coexist with a reducing agent or its precursor, and reduce it with the reducing agent that remains unoxidized to make it diffusible. A method for releasing pigment has also been devised,
A specific example of the dye-donating substance used therein is
It is described in No. 3-110,827, No. 54-130,927, No. 56-164,342, and No. 53-35533.

On the other hand, as a substance that releases a diffusible dye in the area where development has occurred, a substance that releases a diffusible dye through a reaction between a coupler that has a diffusible dye in its aX form and an oxidized developer is disclosed in British Patent No. 1. No. 330.524, Special Publication No. 48-39
, No. 165, and US Pat. No. 3,443,940.

In addition, in systems using these color developers, image contamination due to oxidative decomposition products of the developer becomes a serious problem.
In order to improve this problem, dye-releasing compounds that do not require a developer and have reducing properties themselves have also been devised.

A typical example is, for example, U.S. Patent No. 3,928.312
No. 4,053,312, No. 4,055,42
No. 8, No. 4,336,322, JP-A-59-658
No. 39, No. 59-69839, No. 53-3819,
No. 5i-104343, Research Disclosure No. 17465, U.S. Patent No. 3.725.062,
JP-A No. 3,728,113, JP-A No. 3,443,939, JP-A-58-116.537, JP-A No. 59-17845
It is a dye-donating substance described in US Pat. No. 4,500,626 and the like.

Specific examples of dye-providing substances that can be used in the present invention include US Pat.
4411, among which are compounds (1) to (3) described in the above-mentioned US patent,
(10) to (13), (1B) to (18), (2
B) ~ (30), (33), (35), (38) ~
(40), (42) to (84) are preferred. Compounds described on pages 80 to 87 of Japanese Patent Application No. 59-246468 are also useful.

Hydrophobic additives such as the dye-providing compounds described above and the imaging promoters described below are described in U.S. Pat.
It can be introduced into the layer of the photosensitive material by a known method such as the method described in No. 7. In this case, JP-A-59
No. -83154, No. 59-178451, No. 59-1
No. 78452, No. 59-178453, No. 59-17
No. 8454, No. 59-178455, No. 59-178
A high boiling point organic solvent such as that described in No. 457 may be used in combination with a low boiling point organic solvent having a boiling point of 50° C. to 160″C, if necessary.

The amount of the high-boiling organic solvent is 10 g or less, preferably 5 g or less, per 1 g of the dye-providing substance used.

Also, Japanese Patent Publication No. 51-39853, Japanese Patent Publication No. 51-5994
The dispersion method using a polymer described in No. 3 can also be used.

In the case of a compound that is substantially insoluble in water, it can be dispersed and contained in the form of fine particles in the binder in addition to the method described above. Furthermore, when dispersing a hydrophobic substance in a hydrophilic colloid, various surfactants can be used.
) to (38) pages can be used as surfactants.

In the present invention, it is desirable to include a reducing substance in the light-sensitive material. Examples of the reducing substance include those generally known as reducing agents, as well as the above-mentioned dye-donating substances having reducing properties.

Also included are reducing agent precursors that do not themselves have reducing properties but develop reducing properties through the action of nucleophiles and heat during the development process.

Examples of reducing agents used in the present invention include U.S. Pat.
．． Columns 49-50 of No. 500.626, No. 4,483 of the same.
, No. 914, columns 30-31, JP-A-60-14033
No. 5, pages (17) to (18), JP-A-1284-1984
No. 38, No. 60-128436, No. 60-12843
No. 9.

Reducing agents described in No. 60-128437 and the like can be used. Also, JP-A-56-138736, JP-A No. 57-40
Reducing agent precursors such as those described in US Pat. No. 245, US Pat.

Combinations of various developers can also be used, such as those disclosed in US Pat. No. 3,039,869.

In the present invention, the amount of reducing agent added is 0 per mole of silver.
．． 01 to 20 mol, particularly preferably 0.1 to 10 mol.

In the present invention, an image formation accelerator can be used in the light-sensitive material. Image formation accelerators include accelerating the resistance reduction reaction between silver salt oxidizing agents and reducing agents, accelerating reactions such as generation of dyes from dye-donating substances, decomposition of dyes, and release of mobile dyes, and photosensitive materials. It has the function of promoting the movement of dye from the layer to the dye fixed layer, and from a physicochemical function, it is a base or a! It is classified into group precursors, nucleophilic compounds, high-boiling organic solvents (oils), thermal solvents, surfactants, and compounds that interact with silver or silver ions. However, these substance groups generally have a complex Ia structure and usually have some of the above-mentioned promoting effects.

For details of these, see Japanese Patent Application No. 59-213978 6.
It is described on pages 7-71.

In the present invention, various development stoppers can be used in order to always obtain a constant image despite fluctuations in processing temperature and processing time during development.

The development stopper referred to here is a compound that neutralizes the base immediately after proper development or reacts with the base to lower the base concentration in the film and stop development, or a compound that inhibits development by interacting with silver and silver salts. It is a compound that Specifically, examples include a drunken precursor that releases an acid when heated, an electrophilic compound that causes a substitution reaction with a coexisting base when heated, a nitrogen-containing heterocyclic compound, a mercapto compound, and its precursor (for example, patent application No. 58-216928, No. 59-4
No. 8305, No. 59-85834 or No. 59-85
836).

Compounds that release mercapto compounds upon heating are also useful;
-268926, 59-246468, 60-
No. 26038, No. 460-22602, No. 60-260
No. 39.

No. 60-24665, No. 60-29892, No. 59
There is a compound described in No.-176350.

Further, in the present invention, a compound that activates the development and stabilizes the image can be used in the photosensitive material.

Specific compounds preferably used are described in columns 51-52 of US Pat. No. 4,500,626.

Various antifoggants can be used in the present invention. As an antifoggant.

Azoles, nitrogen-containing carboxylic acids and phosphoric acids described in JP-A-59-168442, or JP-A-59-168442;
Mercapto compounds and metal salts thereof described in No.-111636, acetylene compounds described in patent application (B) dated October 14, 1985 (patent applicant: Fuji Photo Film Co., Ltd.), and the like are used.

In the present invention, the photosensitive material may contain an image toning agent if necessary. Specific examples of effective toning agents include compounds described in Japanese Patent Application No. 59-268926, pages 92-93.

The binders used in the photosensitive material of the present invention may be contained alone or in combination. A hydrophilic binder can be used for this binder. Typical examples of wood-loving binders include transparent or translucent wood-loving binders, such as proteins such as gelatin and gelatin derivatives, and natural substances such as cellulose derivatives, starch, and polysaccharides such as gum arabic. Includes synthetic polymeric materials such as polyvinylpyrrolidone, water-soluble polyvinyl compounds such as acrylamide polymers. Other synthetic polymeric materials include dispersed vinyl compounds in the form of Latinx, which increase the dimensional stability of photographic materials, among others.

In the present invention, the binder is applied in an amount of 20 g or less per lrn', preferably 10 g or less, more preferably 7 g or less.

The ratio of the high boiling point organic solvent dispersed in the binder together with a hydrophobic compound such as a dye-donating substance and the binder is 1 g of binder to 1 g of solvent or less, preferably 0.
A suitable amount is 5 cc or less, more preferably 0.3 cc or less.

The photographic light-sensitive material and dye-fixing material of the present invention may contain an inorganic or organic hardener in the photographic emulsion layer and other binder layers.

Specific examples of hardening agents can be found in Japanese Patent Application No. 59-268926, pages 94 to 95, and Japanese Patent Application Laid-open No. 59-157636 (
Examples include those described on page 381, and these can be used alone or in combination.

The support used in the light-sensitive material and dye-fixing material used in the present invention is one that can withstand processing temperatures. As a general support,
In addition to glass, paper, polymer films, metals and their analogues, those listed as supports on pages 95 to 96 of Japanese Patent Application No. 59-268926 can be used.

When the light-sensitive material used in the present invention contains a colored dye-donating substance, it is not so necessary to further contain an irradiation-preventing substance, an anti-halation substance, or various dyes. There is no such thing as Japanese patent application No. 59-268926, pages 97-98, and U.S. Patent No. 4.5.
Filter dyes, absorbent substances, etc. described in the literature exemplified in No. 00.626, 155a (lines 41 to 52) can be contained.

In order to obtain a wide range of colors in the chromaticity diagram using the three primary colors yellow, magenta and cyan, the light-sensitive element used in the present invention comprises at least three layers of silver halide, each sensitive to a different spectral region. It is necessary to have an emulsion layer.

A typical combination of at least three light-sensitive silver halide emulsion layers sensitive to different spectral regions is described in JP-A-59-180550.

The light-sensitive material used in the present invention may have two or more emulsion layers sensitive to the same spectral region, depending on the sensitivity of the emulsion, if necessary.

The photosensitive material used in the present invention may contain various additives known as heat-developable photosensitive materials and layers other than the photosensitive layer, such as an antistatic layer, a conductive layer, a protective layer, an intermediate layer, an A
It can contain an H layer, a release layer, a matte layer, etc.
Examples of various additives include additives described in Research Disclosure Magazine Vol. 1.170. No. 17029, June 1978, such as plasticizers! ! 1 Additives include sharpness improving dyes, AH dyes, sensitizing dyes, matting agents, surfactants, optical brighteners, ultraviolet absorbers, slip agents, antioxidants, and anti-fading agents.

In particular, the protective layer (PC) usually contains an organic or inorganic matting agent to prevent adhesion. Also, keep this! IN may contain a mordant, a UV absorber, etc.
Each of the protective layer and the intermediate layer may be composed of two or more layers.

Further, the intermediate layer may contain a reducing agent, a UV absorber, and a white pigment such as TiO2 to prevent color mixing. A white pigment may be added not only to the intermediate layer but also to the emulsion layer for the purpose of increasing sensitivity.

The photographic element of the present invention is comprised of a light-sensitive element that forms or releases a dye upon heat development and, optionally, a dye-fixing element that fixes one dye.

In particular, in systems that form images by diffusion transfer of dyes, a photosensitive element and a dye fixing element are essential, and in a typical form, the photosensitive element and dye fixing element are separately coated on two supports. It is broadly divided into two types: a form in which it is coated on the same support and a form in which it is coated on the same support.

The relationship between the photosensitive element and the dye fixing element, the relationship with the support,
Regarding the relationship with the white reflective layer, the relationship described in Japanese Patent Application No. 59-268926, pages 58-59, and US Pat. No. 4,500,626, No. 5741m can be applied to the present application.

A typical configuration in which the photosensitive element and the dye-fixing element are coated on the same support is a configuration in which there is no need to peel off the photosensitive element from the image-receiving element after the transfer image is formed. In this case, the dye fixing layer of the photosensitive layer 1 and the white reflective layer are laminated on a transparent or opaque support. Preferred embodiments include, for example, transparent support/photosensitive layer/white reflective layer/dye fixing layer, transparent support/dye fixing layer/white reflective layer/photosensitive layer, and the like.

Another typical embodiment in which a photosensitive element and a dye fixing element are coated on the same support includes, for example, Japanese Patent Application Laid-Open No. 56-67840.
Canadian Patent No. 674°082, U.S. Patent No. 3,7
30,718, in which part or all of the photosensitive element is stripped from the dye fixing element.

Examples include those having a release layer coated at an appropriate position.

The photosensitive element or dye-fixing element may have a conductive heating layer as a heating stage for thermal development or diffusion transfer of the dye.

Transparent or opaque heating elements in this case.

It can be made using conventionally known techniques as a resistance heating element.

As a resistance heating element, there are two methods: a method using a thin film of an inorganic material exhibiting semiconductivity, and a method using a thin film of an organic material in which conductive fine particles are dispersed in a binder. Materials that can be used in these methods include those described in Japanese Patent Application No. 151,815/1984.

The dye fixing element used in the present invention has at least one layer containing a mordant, and when the dye fixing layer is located on the surface, a protective layer can be further provided if necessary.

The layer structure of the dye fixing element and the installation positions of the binder, additives, and mordant addition layers are as described in Japanese Patent Application No. 59-268926, page 62, line 9 to page 63, line 18, and the patent specifications cited therein. What is described is also applicable to this application.

In addition to the above-mentioned layers, the dye fixing element used in the present invention can be provided with auxiliary layers such as a release layer, a matting agent layer, and an anti-curl layer, if necessary.

One or more of the above layers may include a base and/or base precursor to promote dye transfer, an anti-fading agent to prevent fading of the wood-philic heat solvent 1 dye, a UV absorber, a slip agent, A matting agent, an antioxidant, a dispersed vinyl compound for increasing the dimensional stability, a fluorescent brightener, etc. may be included.
No. 209563, pages 101 to 120.

The binder in the above layer is preferably hydrophilic, and transparent or semitransparent woody colloids are typical. As for the X-isomer, the binders mentioned in the above-mentioned section of the photosensitive material are used.

The image receiving layer in the present invention includes a dye fixing layer used in heat-developable color light-sensitive materials, and can be arbitrarily selected from commonly used mordants, among which polymer mordants are particularly preferred. Polymer mordants include polymers containing tertiary amine groups, polymers having nitrogen-containing heterocyclic moieties, and polymers containing these quaternary cation groups.

Regarding this specific example, please refer to Japanese Patent Application No. 59-268926.
~page 100 and U.S. Pat. No. 4,500.626, No. 57
- It is described in column 60.

In the present invention, the coating method for the heat-developable photosensitive layer, protective layer, intermediate layer, undercoat layer, back layer, and other layers is disclosed in U.S. Pat.
No. 0,626, Nos. 55 to 51 (methods described in 1 can be applied.

As a light source for image exposure for recording an image on a heat-developable photosensitive material, radiation including visible light can be used,
For example, page 100 of Japanese Patent Application No. 59-268926 and U.S. Patent No. 4,500.

The light source described in No. 626, No. 564 [1] can be used.

The heating temperature in the heat development step is about 0°C to about 250°C, but a temperature of about 0°C to about 180°C is particularly useful. Transfer is possible at a temperature in the range of from An iron, a hard roller, a heating element using carbon, titanium white, etc. can be used.

Also, Japanese Patent Application Publication No. 59-218443, Japanese Patent Application No. 60-79
As detailed in No. 709, etc., a method in which development and transfer are performed simultaneously or continuously by heating in the presence of a small amount of a solvent such as water is also useful. In this method, the above-mentioned image formation accelerator may be included in advance in either or both of the dye-fixing material and the photosensitive material, or it may be supplied from the outside.

In the method of performing the above development and transfer simultaneously or continuously, the heating temperature is preferably 50°C or higher and below the boiling point of the solvent. For example, if the solvent is water, the heating temperature is 50°C or higher and 100°C or higher.
The following are desirable.

Further, a solvent may be used to transfer the mobile dye to the dye fixed layer.

Examples of solvents used to accelerate development and/or transfer mobile dyes to the dye fixed layer include water or basic aqueous solutions containing inorganic alkali metal salts or organic bases (these bases may be Those described in the section on formation promoters can be used. Furthermore, a low boiling point solvent or a mixed solution of a low boiling point solvent and water or a basic aqueous solution can also be used. Further, surfactants, antifoggants, etc. may be included in the solvent.

These solvents can be used in dye-fixing materials, photosensitive materials, and in methods for applying them to both. The amount used may be as small as not more than the weight of the solvent corresponding to the maximum swelling volume of the entire coating (particularly less than the weight of the solvent corresponding to the maximum rfMffI volume of the entire coating minus the weight of the entire coating).

A solvent (for example, water) is applied between the photosensitive layer of the heat-developable photosensitive material and the dye fixing layer of the dye fixing material to promote image formation and/or dye transfer. It can also be used by incorporating it into the dye fixing layer or both.

As a method for applying a solvent to the photosensitive layer or the dye fixing layer, there is, for example, the method described in Japanese Patent Application No. 59-268926, page 101, line 9 to page 102, line 4.

Furthermore, in order to promote dye transfer, a method may be adopted in which a wood-philic thermal solvent that is solid at room temperature and dissolves at high temperature is incorporated into the light-sensitive material or dye-fixing material. The wood-philic thermal solvent may be incorporated into either the photosensitive material or the dye-fixing material.
The layer to be incorporated may be any of the emulsion layer, intermediate layer, and protective layer 1 dye fixing layer, but it is preferable to incorporate it in the dye fixing layer and/or its adjacent layer.

Examples of hydrophilic heat solvents include ureas, pyridines, amides, sulfonamides, imides, alcohols, oximes, and other heterocycles.

The heating means in the transfer process is disclosed in Japanese Patent Application No. 59-26892.
There is a means described in No. 6, page 102, line 14 to page 103, line 11. Alternatively, a layer of an electrically conductive material such as graphite, carbon black, or metal may be applied to the dye-fixing material in an overlapping manner, and an electric current may be passed through this electrically conductive layer to heat it directly.

The pressure conditions and method of applying pressure when overlapping the heat-developable photosensitive material and the dye-fixing material and bringing them into close contact are described in Japanese Patent Application No. 59-2.
The method described on pages 103 to 104 of No. 68926 can be applied.

■Specific effects of the invention According to the present invention, a mobile base is generated by the reaction between an immobilized strong base and a neutral water-soluble salt in the image forming reaction system, so that high concentration This provides an image forming method that provides images with low fog, has excellent storage stability, and is easy to process.

(2) Specific Examples of the Invention Hereinafter, specific examples of the present invention will be shown and the present invention will be explained in more detail.

Example 1 This article describes how to make benzotriazole silver emulsion.

28 g of gelatin and 13.2 g of benzotriazole were dissolved in 300 rnl of water. This solution was kept at 40°C and stirred. A solution prepared by dissolving 17 g of silver nitrate in 100 ml of water was added to this solution over a period of 2 minutes.

The pH of the benzotriazole silver emulsion was adjusted and allowed to settle to remove excess salt. Thereafter, the pH was adjusted to 6.30, and a yield of 400 g of benzotriazole silver emulsion was obtained.

This article describes how to make silver halide emulsions for the 5th and 1st layers.

A well-stirred gelatin aqueous solution (20 g of gelatin and 3 g of sodium chloride in 10,100 O of water)
600 ml of an aqueous solution containing sodium chloride and potassium bromide (containing water and kept at 75°C) and a silver nitrate aqueous solution (0.59 mol of silver nitrate dissolved in 600 m of water) were simultaneously applied at equal flow rates for 40 minutes. Added with.

In this way, a monodisperse cubic silver chlorobromide emulsion (bromine 50 mol %) with an average grain size of 0.40 gm was prepared.

After washing with water and desalting, 5 mg of sodium thiosulfate and 4-hydroxy-6-methyl-1,3,3a.

Add 20 m g f g of 7-tetrazaindene.

Chemical sensitization was carried out at 60"C. The yield of emulsion was 600"C.
It was g.

Next, we will explain how to make a silver halide emulsion for the third layer.

A well-stirred gelatin aqueous solution (20 g of gelatin and 3 g of sodium chloride in 10,100 O of water)
600 ml of an aqueous solution containing sodium chloride and potassium bromide (containing water and kept at 75°C) and a silver nitrate aqueous solution (0.59 mol of silver nitrate dissolved in 600 ml of water) were simultaneously heated for 40 minutes. Added at equal flow rates.

In this way, a monodisperse cubic silver chlorobromide emulsion (80 mol % bromine) with an average grain size of 0.351 Lm was prepared.

After washing with water and desalting, 5 mg of sodium thiosulfate and 4-hydroxy-6-methyl-1,3,3a.

Chemical sensitization was performed at 60° C. by adding 20 mg of 7-tetrazaindene. The yield of emulsion is.

It was 600g.

Next, how to make a gelatin dispersion of a dye-donating substance will be described.

5 g of yellow dye-donating substance (A), 0.5 g of sodium succinate 2-dithylhexyl ester sulfonate, 1 triinnonyl phosphate as a surfactant.
0g was weighed out, 30ml of ethyl acetate was added thereto, and the mixture was heated and dissolved at about 60°C to form a homogeneous solution. After stirring and mixing this solution and 100 g of a lO% solution of lime-treated gelatin,
Dispersion was performed using a homogenizer for 10 minutes at 110,000 rpm. This dispersion is called a yellow dye-providing substance dispersion.

A dispersion of a magenta dye-donating substance was prepared in the same manner as above, except that the magenta dye-donating substance (B) was used and 7.5 g of tricresyl phosphate was used as a high-boiling solvent. .

A cyan dye dispersion was prepared using a cyan dye-providing substance (C) in the same manner as the yellow dye dispersion.

Next, how to make a gelatin dispersion of the base (1) of the present invention will be described.

50 mJl of a 5% aqueous solution of lime-treated gelatin was heated to about 90°C, and 5 g of the base (1) of the present invention was added thereto and melted. Mix this mixture with a homogenizer for 10 minutes.
While dispersing at 10,000 rpm, the temperature was lowered to near room temperature to obtain a gelatin dispersion of the base (1) of the present invention.

With these, a color photosensitive material 101 having a multilayer structure as shown in the first table was prepared.

:! :.

$ too , lonely 4]″ (C) (D-1) (D-2) (D-3) Ku Next, how to make the dye fixing material D-1 will be described.

Dissolve 10 g of poly(methyl acrylate-N,N,N-trimethyl-N-vinylbenzylammonium chloride) (ratio of methyl acrylate and vinylbenzylammonium chloride: 1:1) in 175 mM water,
The mixture was uniformly mixed with 100 g of 05 lime-treated gelatin. Add 2,4-dichloro-6-hydroxy-1,3 to this mixture.
, 5-1 was added to 25 ml of a 4% aqueous solution of riazine and uniformly coated on a 90 mm wet film H on a paper support laminated with polyethylene in which titanium dioxide was dispersed.

Furthermore, on top of this, 5 g of guanidine sulfate and 18 m of water, lO%
A solution obtained by mixing and dissolving 20 g of gelatin and 4.8 mJl of a 1% aqueous solution of sodium succinate-2-ethyl-hexyl ester sulfonate was applied to a wet film thickness of 307 zm, and after drying, a dye fixing material D-1 having a mordant layer was prepared. use

A tungsten light bulb is used for the color photosensitive material 101 having the multilayer structure, and a G, R, and IR three-color separation filter (G is 500 to 600 nm, R is 60 nm, and the density is continuously changed) is used.
Bandpass filter from 0 to 700 nm, IR is 7
The film was exposed to light at 500 lux for 1 second through a filter (constructed using a filter that transmits 00 nm or more).

20 mfL/
m2 of water was supplied with a wire bar.

Thereafter, the film was overlapped with dye fixing material D-1 so that the film surfaces were in contact with each other. When the dye-fixing material is peeled off from the light-sensitive material after heating for 20 seconds using a heat roller whose temperature is adjusted so that the temperature of the water-absorbed film is 90 to 95°C, the three colors G, R, and IR are deposited on the fixing material. Clear images of yellow, magenta, and cyan were obtained depending on the separation filter. Macbeth reflection densitometer (RD-5)
19), the results shown in Table 1 were obtained.

Next, as Comparative Example 1, a photosensitive material 102 was prepared in exactly the same manner except that the base (1) of the present invention was removed from the photosensitive material 101.
It was created.

When the photosensitive material 102 and dye fixing material D-1 were processed in the same manner as described above, no color image was obtained as shown in Table 1.

Further, as Comparative Example 2, dye fixing material D-1 was prepared in the same manner except that guanidine sulfate was removed from dye fixing material D-1.
2 was created.

When the photosensitive material 101 and dye fixing material D-2 were processed in the same manner as described above, almost no color image was obtained as shown in Table 1.

The results in Table 1 show that images with high density and low fog can be obtained by the combination of the base (1) of the present invention and guanidine sulfate.

Further, when photosensitive material 101 and dye fixing material D-1 were each stored at 40 DEG C. and 70% relative humidity for 7 days and then processed in the same manner, both the highest and lowest densities were almost the same as those shown in Table 1.

It can be seen that the light-sensitive material and dye-fixing material of the present invention have good storage stability.

Example 2 We will describe how to make dye-fixing materials.

Dissolve 10 g of poly(methyl acrylate-N,N,N-trimethyl-N-vinylbenzylammonium chloride) (ratio of methyl acrylate and vinylbenzylammonium chloride is 1:1) in 175 mR of water,
The mixture was uniformly mixed with 100 g of 05 lime-treated gelatin. Add 2,4-dichloro-6-hydroxy-1,3 to this mixture.
, 5-) 25 axl of a 4% aqueous solution of riazine was added and coated uniformly to a Couette film thickness of 90 p, m on a paper support laminated with polyethylene in which titanium dioxide was dispersed. After drying this sample, dye fixing material D having a mordant layer is prepared.
Used as -3.

After exposing the photosensitive material 101 of Example 1, 20 mfL/g of 20% guanidine sulfate was applied to the dye fixing material D-3 using a wire bar so that the film surface was in contact with the exposed photosensitive material. After superposition, the same operations and treatments as in Example 1 were performed to obtain the first-order results.

Color Image Maximum density Minimum density Yellow - 1.28
0.13 magenta 1.36 0.1
4 Cyan 1.49
The results of 0.13 or higher indicate that there is no difference in effectiveness whether the neutral water-soluble salt is incorporated into the dye-fixing material or supplied from the outside.

Further, a lot of photosensitive material and dye fixing material D-3 were each stored at 40 DEG C. and 70% relative humidity for 7 days and then treated in the same manner, but both the highest and lowest densities showed almost no difference from the above results. It can be seen that it has good storage stability.

Example 3 Preparation of benzotriazole silver emulsion containing photosensitive silver bromide 6.5 g of hensotriazole and Log gelatin were added to 10 g of water.
00 ml. The solution was kept at 50'C and stirred. Next, add 8.5g of silver nitrate to 100mM of water.
was added to the above solution over a period of 2 minutes.

Next, a solution of 1.2 g of potassium bromide dissolved in 50 mA of water was added over 2 minutes. The prepared emulsion is pHJ! Sedimentation was performed by sieving to remove excess salt. Thereafter, the pH of the emulsion was adjusted to 6.0. Yield was 200g.

Preparation of gelatin dispersion of dye-donating substance: 10 g of a dye-donating substance with the following structure, 0.5 g of succinic acid-2-ethyl-hexyl ester sulfonate soda, and trire resin phosphate (TCP) as a surfactant. ) Dispense 4g and add 20mM of cyclohexanone.

The mixture was heated and dissolved at about 60°C to form a uniform solution.

After stirring and mixing this solution and 100 g of a 10% solution of lime-treated gelatin, the mixture was heated to 1100 g for 10 minutes using a homogenizer.
Dispersion was carried out at 00 rpm.

Next, a method for preparing a photosensitive coating will be described.

(a) Benzotriazole silver emulsion containing photosensitive silver bromide
Log (b) Dispersion of dye-donating substance 3.5 g (C) Gelatin (10% aqueous solution) 5 g (d) 2, 0.2 g of 6-dichloro-4-aminophenol in 2 m of methanol
Solution (e) 1 mg of a 10% aqueous solution of a compound having the following structure dissolved in Jl.

C9HI300 (CH2CH20) a H(f)
1, 2-bis(vinylsulfonyl 7cetamido)ethane 1, 5mM or more (a) to (f)
After mixing and heating and melting, it was applied to a wet film thickness of 30Bm on a 180pm thick polyethylene terephthalate film! OI, dried.

Furthermore, 30 JLm of the following composition was added as a protective layer on top of this.
A photosensitive material was prepared by coating with a wet film thickness of

b) Gelatin 10% aqueous solution 30m mouth) Gelatin dispersion of the base (1) of the present invention (as described in Example 1)
20g of this photosensitive material 301 was imagewise exposed for 10 seconds at 2000 lux using a tungsten bulb. Thereafter, the same treatments and operations as in Example 1 were performed using the dye fixing material D-1 of Example 1, and the following results were obtained.

Maximum concentration: 1.42 Minimum concentration: 0.16 Example 4 Example 2 was prepared by adding equivalent amounts of the bases shown in Table 2 to the protective layer instead of the base (1) of the present invention used in the photosensitive material of Example 3.
Photosensitive materials 401 to 405 were prepared in the same manner. Also,
In place of the guanidine sulfate used in dye fixing material D-1 of Example 1, equal equivalent amounts of neutral salts shown in Table 2 were used to prepare dye fixing materials D-4 and D-5.

When the same treatments and operations as in Example 1 were carried out using the light-sensitive materials and dye fixing materials shown in Table 3, the results shown in Table 3 were obtained.

Table 2 Table 3 Photosensitive materials Dye Highest density Lowest density fixing material 301 D-41,500,16 3010-51,430,14 401D-41,480,15 4020-41,550,18 4030-41,470,16 4040-41,590,16 4050-41,550,15 The results in Table 3 show that images with high density and low fog can be obtained by the method of the present invention.

Example 5 A photosensitive material was prepared by coating the following layers on a polyethylene terephthalate film support in the order listed.

l) Silver benzotriazole (0.62 g/m in silver content)
2), silver iodobromide (1.42 g/m2 in silver content), a dye developer compound of structure V (0.52 g/m2),
), gelatin y (4,25 g/m2), auxiliary developer of structure W (0,11 g/m2), antifoggant of structure X (0,20 g/m2), compound of structure Y (0,40 g/m2), a compound of structure Z (0,95 g/m2),) licresyl phosphate (0,90 g/m2) and a hardener of structure H (0,20 g/m2). layer 2) containing gelatin (1,2 g/m2) and the base (1) of the invention (2,4 g/m') Note) (1) dye developer compound (structure V) (2) ) Auxiliary developer (Structure W) (3) Antifoggant (Structure X) (4) Surfactant (Structure Y) C9HI3 <> 0([:H2CH20)8 H(5
) Compound (M structure Z) (6) Hardener (Structure H) CH2=CH5O2CH2C0NHCH2CH2NHC
OCH2502CH=CH2 The photosensitive material having the above structure was imagewise exposed to light at 20,000 lux for 1 second using a tungsten bulb.

Thereafter, using the dye fixing material D-1 of Example 1, the same operations and treatments as in Example 1 were performed, and the results shown below were obtained.

From the results of maximum density 1.62 and minimum density 0.2, it can be seen that images with high density and low fog can be obtained by the method of the present invention.

Example 6 The method of making the emulsion for the first layer will be described.

Add 600 d of an aqueous solution containing sodium chloride and potassium bromide and a silver nitrate aqueous solution to a well-stirred aqueous gelatin solution (1000 d of water containing 20 g of gelatin and 3 g of sodium chloride, kept at 75°C).
At the same time, 0.59 mol of silver nitrate dissolved in 600 d of water was added at an equal flow rate over 40 minutes. In this way, a monodisperse cubic silver chlorobromide emulsion (80 mol % of bromine) with an average grain size of o and 3 sg was prepared.

After washing with water and desalting, 5 mg of sodium thiosulfate and 20 rmg of 4-hydroxy-6-methyl-1,3,3a,7-tetrazaindene were added to perform chemical sensitization at 60°C.
The yield of emulsion was 600 g.

Next, I will talk about how to make the emulsion for the third layer.

A well-stirred gelatin aqueous solution (20 g of gelatin and 3 ml of sodium chloride in 1000 m of water!
An aqueous solution containing sodium chloride and potassium bromide (600-g containing 75°C), a silver nitrate aqueous solution (0.59 mol of silver nitrate dissolved in 600 d of water) and the following dye solution (I ) were simultaneously added at equal flow rates over 40 minutes. In this way, a monodisperse cubic silver bromide emulsion (80 mol % of bromine) was prepared in which a dye having an average grain size of 0.35# was adsorbed.

After washing with water and desalting, 5 mg of sodium thiosulfate and 20 mg of 4-hydroxy-6-methyl-1,3,3a,7-tetrazaindene were added to perform chemical sensitization at 60°C. The yield of emulsion was 600 g.

Next, a method for preparing a silver halide emulsion for the fifth layer will be described.

A well-stirred aqueous gelatin solution (20 g of gelatin and ammonia dissolved in 1000 ml of water and kept at 50°C) contains 100,100 O of an aqueous solution containing potassium iodide and potassium bromide, and an aqueous solution of silver nitrate (silver nitrate in 1000 d of water). 1 mol of PAg was added at the same time while keeping the PAg constant. In this way, a monodispersed silver iodobromide octahedral emulsion (5 mol % of iodine) having an average grain size of o and sg was prepared.

After washing with water and desalting, 51 g of chloroauric acid (tetrahydrate) and 2 g of sodium thiosulfate were added to perform gold and sulfur sensitization at 60°C. The yield of emulsion was 1.0 kg.

This article describes how to make an acetylene silver emulsion.

20 g of gelatin and 4.6 g of 4-acetylaminophenyl acetylene were dissolved in 10ooat+ of water and 200 d of ethanol.

This solution was kept at 40°C and stirred.

A solution prepared by dissolving 4.5 g of silver nitrate in 200 d of water was added to this solution over 5 minutes.

The pH of the dispersion was adjusted and excess salt was removed by settling. Thereafter, the pH was adjusted to 6.3 to obtain a dispersion of an acetylene silver compound in a yield of 300 g.

Note that a gelatin dispersion of a dye-donating substance was prepared in the same manner as in Example 1.

Using these materials, a color photosensitive material having a multilayer structure as shown in the following table was prepared.

The multilayered color photosensitive material was exposed to light at 2000 lux for 1 second using a tungsten light bulb through a three-color separation filter of B, G, and H whose density was continuously changed.

20 d/g of water was supplied to the emulsion surface of this exposed light-sensitive material using a wire bar, and then dye fixing material D of Example 1 was added.
-1, and were superimposed so that the film surfaces were in contact with each other. Thereafter, the same treatments and operations as in Example 1 were performed, and the following results were obtained.

Three-color separation Color Image Highest density Lowest density filter B Yellow 1.80 0.14G
Magenta 1.92 0.14R Cyan
1.97 0.13 Furthermore, the above-mentioned photosensitive material and dye-fixing material D-1 were each stored at 40°C and 70% relative humidity for 7 days, and then processed in the same manner, but both the highest and lowest densities were as above. The results were almost unchanged.

From the above results, it is clear that the method of the present invention provides images with high density and low fog, and has excellent storage stability.

Claims (1)

[Claims] An image-forming reaction system containing an immobilized strong base and a neutral water-soluble salt, characterized in that a mobile base is produced by a reaction between the two compounds described above in the presence of water. Image forming method.