JPH0473770B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to an internal latent image type direct positive silver halide photographic light-sensitive material, and more specifically, an internal latent image type direct positive silver halide photographic material that can obtain a high maximum density and a low minimum density direct positive image with short development time. This invention relates to an image-type direct positive silver halide photographic material. BACKGROUND OF THE INVENTION Silver halide photographic materials capable of directly forming positive images without the need for reversal processing or negative photographic images are generally well known. Methods for producing positive images using such direct positive type silver halide photographic materials, excluding special methods, can be mainly divided into the following two types in consideration of practical usefulness. One type uses a pre-coupled silver halide emulsion and uses solarization or the Herschel effect to destroy fog nuclei (latent images) in exposed areas, thereby obtaining a positive image after development. . The other type uses an uncoupled internal latent image type silver halide emulsion and performs surface development after image exposure and/or while performing fogging treatment to obtain a positive image. . Here, the fogging treatment may be performed by exposing the entire surface to light, using a fogging agent, using a strong developer, heat treatment, etc., but usually a fogging agent is not used. It is carried out using The term "internal latent image type silver halide emulsion" refers to a silver halide emulsion which mainly has photosensitive nuclei inside the silver halide grains and forms a latent image inside the grains upon exposure. This latter type of method of directly obtaining a positive image using a silver halide emulsion generally has higher sensitivity than the former type of method, and is suitable for applications requiring high sensitivity. It is related to these. Various techniques are known to date in this technical field. For example, US Pat. No. 2,592,250,
Same No. 2456957, Same No. 2497875, Same No. 2588982,
British Patent No. 1151363, Japanese Patent Publication No. 43-29405
No. 47-9434, 47-9677, 47-
No. 32813, No. 47-32814, No. 48-9727, No. 48-
The main ones include US Pat. No. 9717, US Pat. No. 3,761,266, US Pat. By using these known methods, it is possible to produce a relatively highly sensitive photographic material as a direct positive type. For details on the mechanism of direct positive image formation, see, for example, "The Theory of the Photographic Process" by Mies and James.
You can understand to some extent the process by which positive images are formed by the ``desensitizing effect of internal latent images'' as discussed on page 161 of the 3rd edition. In other words, due to the surface desensitization effect caused by the so-called internal latent image generated inside the silver halide grains by the initial image exposure, fog nucleation occurs selectively only on the surface of the unexposed silver halide grains in the non-image area. It is thought that a photographic image is formed in the unexposed areas by normal development. In order to achieve selective fogging as described above, methods are known in which the entire surface is uniformly exposed to light or a chemical fogging agent is used to form fogging nuclei. It is true. However, in order to apply the above-described direct positive image forming method to various photographic fields, there remain technical issues that must be further improved. For example, regarding the above-mentioned fog development, the fogging reaction with the fogging agent that creates fog nuclei must occur prior to the development reaction, so compared to the development of ordinary latent image silver, it takes longer to induce the development to start. The period is longer and development is significantly delayed. Therefore, especially when multilayer color photographic materials are used, sensitivity characteristics tend to become non-uniform between the constituent layers, and the maximum density of the final image is also relatively low. cause problems. One way to improve this, for example, is to increase the maximum density in a color diffusion transfer method using a direct positive silver halide emulsion. It is stated that you can get Also, Special Publication No. 57-60616, No. 57-60617,
Compounds having similar effects are also described in No. 57-60618. However, it is widely known that even if the compounds disclosed above are used, a sufficient improvement in development speed cannot necessarily be obtained, and on the contrary, when such compounds are used in large amounts, the maximum density is significantly reduced. That is what we are doing. The above-mentioned hydroquinone sulfonic acid derivative has an effect as a scavenger for oxidized developing agent, so it can be used in combination with a dye-donating substance that generates a dye in response to development of silver halide or releases a diffusible dye. When used, the amount used must necessarily be limited to an amount that can promote fog development. Under these circumstances, it is desired to develop a compound that is even more excellent in promoting development. OBJECTS OF THE INVENTION It is therefore an object of the present invention to promote the progress of fogging development and to obtain internal latent image type silver halide images with high maximum density and low minimum density in a relatively short period of time. Our objective is to provide photographic materials. Structure of the Invention The above object of the present invention can be achieved by an internal latent image type direct positive silver halide photographic light-sensitive material having a constituent layer containing a compound represented by the following general formula [I] on a support. I found it. General formula [I] In the formula, R ¹ is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkyl group having 1 to 4 carbon atoms substituted with a carboxyl group, an amino group, a carbamoyl group, or a hydroxy group, or

[Formula] (where m represents an integer of 0 to 2), R ² represents -OM (however, M represents a hydrogen atom or an alkali metal atom) or an amino group, and R ³ and R ⁴ may be the same or may be different, and each may be a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an acertyl group substituted with an amino group, or

[Formula] (where n represents an integer from 0 to 1). The present invention will be explained in more detail below. As mentioned above, the present invention is characterized in that the photographic constituent layer (described later) contains a compound represented by the general formula [ ^I ]. The alkyl group of 6 may be linear or branched, such as methyl group, ethyl group, propyl group, n-butyl group, t
-butyl group, n-hexyl group and the like. Also, 1 carbon atom substituted with a carboxy group, amino group, carbamoyl group, hydroxy group, etc.
-4 alkyl groups include, for example, methyl, ethyl, propyl, and butyl groups. Furthermore, R ¹ represents

For [Formula], m is 0 to 2, but m is 1 or 2
In the case of , the substitution position of the OH group may be arbitrary. Next, examples of the alkali metal represented by M in the -OM group represented by ^R2 include atoms such as sodium and potassium. Further, the alkyl group having 1 to 6 carbon atoms represented by R ³ and R ⁴ may be either linear or branched, and examples thereof include methyl group, ethyl group, propyl group, t-butyl group, hexyl group, etc. I can do it. Also, R ³ and R ⁴ above represent

Regarding [Formula], when n is 1, the position of the OH substituent may be arbitrary. Typical specific examples of the compound according to the present invention represented by the general formula [I] (hereinafter referred to as the compound of the present invention) are described below, but the present invention is not limited thereto. (Exemplary compounds) (1) CH ₂ (NH ₂ )COOH (4) CH ₃ CH(NH ₂ )COOH (5) (CH ₃ ) ₂ CHCH ₂ CH(NH ₂ )COOH (17) CH ₂ (NH ₂ )CONH ₂ (18) CH ₂ (NH ₂ )COONa (20) _CH3CH ( _NH2 )COONa The compounds of the present invention can be used, for example, in Chemical Review, Vol. 38, p. 501 (1946);
It can be synthesized by the method described in "Synthesis" Volume 1, page 21, etc., and can also be obtained as a commercial product. The compound of the present invention obtained as described above can be contained in any of the below-mentioned constituent layers provided on the support constituting the internal latent image type silver halide photographic light-sensitive material. It is preferably contained in both the emulsion layer and the adjacent layer, and particularly preferably in the silver halide emulsion layer. The amount of the compound of the present invention to be used is sufficient to promote fog development when the internal latent image type silver halide photographic light-sensitive material is developed.
The amount actually used varies widely depending on the characteristics of the photographic material, development conditions, etc., but when it is contained in the silver halide emulsion layer, per mole of silver,
It is about 0.0001 to 0.5 mol, preferably 0.001 to 0.5 mol.
It is 0.1 mole. When it is contained in a layer adjacent to the emulsion layer, it may be used in the same manner as in the case where it is contained in the emulsion layer. The compound of the present invention is added after being dissolved in water or an organic solvent miscible with water, such as alcohol or acetone. When applied to a silver halide emulsion layer, the addition time is from after the completion of ripening of the emulsion. It is preferable to add it at an appropriate time before coating, or when applying it to other layers, such as adjacent layers, at an appropriate time from the time of preparing the coating solution to before coating. In the present invention, the main step of directly forming a positive image is to subject an uncoupled internal latent image type silver halide photographic light-sensitive material to surface development after image exposure and fogging treatment, or while performing fogging treatment. It consists of doing. The fogging treatment at this time is performed using a fogging agent. A wide variety of compounds can be mentioned as the fogging agent that can be used in the present invention, but the fogging agent only needs to be present during the development process, for example, in internal latent image type silver halide photographs such as silver halide emulsion layers. It can be contained in the photosensitive material or in the developer or processing solution prior to development, but it is preferably contained in the silver halide photographic material (particularly in the silver halide emulsion layer). The amount used can be varied widely depending on the purpose, and the preferred amount is 1 silver halide when added to a silver halide emulsion layer.
0.1 to 1500 mg per mole, particularly preferably 1 to 1000
mg. When added to a processing solution such as a developer, the preferred amount is 0.01 to 5 g/, particularly preferably 0.05 to 1 g/. Examples of the fogging agent used in the present invention include hydrazide or hydrazone compounds described in U.S. Pat. Nos. 2,563,785 and 2,588,982, and U.S. Pat.
Examples include heterocyclic quaternary nitrogen salt compounds described in US Pat. No. 3,734,738 and US Pat. Further, these fogging agents can also be used in combination. For example, research disclosure
No. 15162 describes the use of a non-adsorption type fogging agent in combination with an adsorption type fogging agent. Specific examples of conventionally known useful fogging agents include:
hydrazine hydrochloride, phenylhydrazine hydrochloride,
4-methyl-phenylhydrazine hydrochloride, 1-formyl-2-(4-methylphenyl)hydrazine,
1-acetyl-2-phenylhydrazine, 1-acetyl-2-(4-acetamidophenyl)hydrazine, 1-methylsulfonyl-2-phenylhydrazine, 1-benzoyl-2-phenylhydrazine, 1- Methylsulfonyl-2-(3-phenylsulfonamidophenyl)hydrazine,
Hydrazine compounds such as formaldehyde phenylhydrazone; 3-(2-formylethyl)-2-
Methylbenzothiazolium bromide, 3-(2
-formylethyl)-2-propylbenzothiazolium bromide, 3-(2-acetylethyl)-
2-benzylbenzoselenazolium bromide,
3-(2-acetylethyl-2-benzyl-5-
Phenyl-benzoxazolium bromide, 2
-Methyl-3-[3-(phenylhydrazono)propyl]benzothiazolium bromide, 2-methyl-3-[3-(p-tolylhydrazono)propyl]benzothiazolium bromide, 2-methyl-3- [3-(p-sulfophenylhydrazono)
propyl]benzothiazolium bromide, 2-
Methyl-3-[3-(p-sulfophenylhydrazono)pentyl]benzothiazolium iodide,
1,2-dihydro-3-methyl-4-phenylpyrido[2,1-b]benzothiazolium bromide, 1,2-dihydro-3-methyl-4-phenylpyrido[2,1-b]-5-phenylpyrido enylbenzoxazolium bromide, 4,4'-ethylenebis(1,2-dihydro-3-methylpyride [2,1
-b]benzothiazolium bromide), 1,2
-N-substituted quaternary cycloammonium salt such as dihydro-3-methyl-4-phenylpyrido[2,1-b]benzoselenazolium bromide; 5-
[1-Ethylnaphtho(1,2-b)thiazoline-
2-ylideneethylidene]-1-(2-phenylcarbazoyl)methyl-3-(4-sulfamoylphenyl)-2-thiohydantoin, 5-(3-ethyl-2-benzothiazolinidene) )-3-[4-
(2-formylhydrazino)phenyl]rhodanine, 1-[4-(2-formylhydrazino)phenyl]3-phenylthiourea, 1,3-bis[4-(2-formylhydrazino)phenyl] ) phenyl]thiourea, etc. The internal latent image type silver halide photographic light-sensitive material of the present invention directly forms a positive image by developing in the presence of a fogging agent after imagewise exposure. Although any development method can be adopted as the development method, a surface development method is preferable. This surface development processing method means processing with a developer substantially free of silver halide solvent. Common silver halide developers that can be used in the present invention include polyhydroxybenzenes such as hydroquinosine, aminophenols, 3-pyrazolidones, ascorbic acid and its derivatives, reductones, and phenylenediamines. etc. or a mixture thereof. Specifically, hydroquinone, aminophenol, N-methylaminophenol, 1-phenyl-3-pyrazolidone, 1-phenyl-4,4-dimethyl-3-pyrazolidone, 1-phenyl-4-methyl-4-hydroxymethyl- 3-pyrazolidone, ascorbic acid, N,N-diethyl-p-phenylenediamine, diethylamino-o-toluidine, 4-amino-3-methyl-N-ethyl-N-(β-methanesulfonamidoethyl)aniline, Examples include 4-amino-3-methyl-N-ethyl-N-(β-hydroxyethyl)aniline. These developers can also be included in the emulsion in advance and allowed to act on the silver halide during immersion in a high pH aqueous solution. The developer used in the present invention may further contain specific antifoggants and development inhibitors, or these developer additives may be optionally incorporated into the layers of the silver halide photographic light-sensitive material. is also possible. Commonly useful antifoggants include benzotriazoles such as 5-methylbenzotriazole; benzothiazoles; heterocyclic thiones such as 1-phenyl-5-mercaptotetrazole; aromatic and aliphatic mercapto Compounds, etc. are included. Further, the developer can also contain a development accelerator such as a polyalkylene oxide derivative or a quaternary ammonium salt compound. The internal latent image type silver halide photographic light-sensitive material according to the present invention comprises at least one layer of internal latent image type silver halide emulsion. The internal latent image type silver halide emulsion according to the present invention is an emulsion having silver halide grains that mainly form a latent image inside the silver halide grains and has most of the photosensitive nuclei inside the grains. Included are silver halides such as silver bromide, silver chloride, silver chlorobromide, silver iodobromide, silver chloroiodobromide, and the like. Particularly preferably, the emulsion is prepared by exposing a portion of a sample coated on a transparent support to a light intensity scale for a defined period of time up to about 1 second so that the surface of the grains is substantially free of silver halide solvent. When developed for 4 minutes at 20°C using surface developer A as described below, which develops only the image, internal development as described below, in which another part of the same emulsion sample is exposed in the same way and develops the image inside the grain. It shows a maximum density not greater than 1/5 of the maximum density obtained when developing with solution B at 20° C. for 4 minutes. Preferably, the maximum density obtained with surface developer A is not more than 1/10 of the maximum density obtained with internal developer B. (Surface developer A) Metol 2.5g L-ascorbic acid 10g NaBO _{2.4H 2} O 35g KBr 1g Add water 1 (Internal developer B) Metol 2.0g Sodium sulfite (anhydrous) 90.0g Hydroquinone 8.0g Sodium carbonate water Salt 52.5g KBr 5.0g KI 0.5g Water added 1 The internal latent image type silver halide emulsion according to the present invention includes those prepared by various methods.
For example, the convergence silver halide emulsions described in U.S. Pat. No. 2,592,250, or U.S. Pat.
Silver halide emulsions with internally chemically sensitized silver halide grains as described in U.S. Pat. Silver halide emulsions having silver halide grains containing valent metal ions, or U.S. Pat.
A silver halide emulsion in which the grain surface of silver halide grains containing a dopant is weakly chemically sensitized as described in No. 3761276, or JP-A-8524-1989
Silver halide emulsions comprising grains having a laminated structure described in Japanese Patent Application Laid-open Nos. 50-38525 and 53-2408, and other specifications of JP-A-52-156614 and JP-A-55-127549. These include silver halide emulsions described in the book. Further, in the internal latent image type silver halide emulsion according to the present invention, commonly used stabilizers, such as compounds having an azaindene ring and nitrogen-containing heterocyclic compounds having a mercapto group (typical examples include 4-hydroxy- 6-methyl-1,3,3a,
7-tetrazaindene and 1-phenyl-5-
By containing 1 mg to 10 g of mercaptotetrazole per mole of silver halide, a more stable result with a lower minimum concentration can be obtained. In addition, in the present invention, as antifoggants or stabilizers, for example, mercury compounds, triazole compounds, azeindene compounds, benzothiazolium compounds, zinc compounds, etc. may be used. Various photographic additives may optionally be added to the internal latent image type silver halide emulsion according to the present invention. For example, optical sensitizers that can be used in the present invention include cyanines, merocyanines, trinuclear or tetranuclear merocyanines, trinuclear or tetranuclear cyanines, styryls, holoporacyanines, hemicyanines, and oxonols. These optical sensitizers contain basic groups such as thiazoline and thiazole, or rhodanine, thiohydantoin, oxazolidinedione, barbituric acid, and thiol as a nitrogen-containing heterocyclic nucleus. Those containing a nucleus such as barbituric acid, pyrazolone, etc. are preferred, and such nucleus can be substituted with alkyl, hydroxyalkyl, sulfoalkyl, carboxyalkyl, halogen, phenyl, cyano, alkoxy, or fused with a carbocyclic or heterocyclic ring. That is optional. The internal latent image type silver halide emulsion according to the present invention can be supersensitized. Regarding the method of supersensitization, for example, ``Review of the mechanism of supersensitization'' (Photographic Science and Engineering) (PSE) Vol. 18, Page 4418 (1974)
Listed in the year. Other additives used depending on the purpose in the present invention include wetting agents such as dihydroxyalkanes, and film property improvers such as alkyl acrylate or alkyl methacrylate and acrylic acid or methacrylic acid. Water-dispersible fine particle polymeric substances obtained by emulsion polymerization such as copolymers with acids, styrene-maleic acid copolymers, styrene-maleic anhydride half-alkyl ester copolymers, etc. are suitable; Examples of the agent include saponin, polyethylene glycol lauryl ether, and the like. Other photographic additives include gelatin plasticizers, surfactants, ultraviolet absorbers, PH regulators, antioxidants, antistatic agents, thickeners, graininess improvers, dyes, mordants, brighteners, and development speed. The use of conditioning agents, matting agents, etc. is optional. The silver halide emulsion prepared as described above may be coated with other constituent layers, such as an intermediate layer, a protective layer,
It is coated on a support via a subbing layer, an antihalation layer, a filter layer, etc. to obtain an internal latent image type silver halide photographic light-sensitive material. The silver halide photographic material according to the present invention includes:
It can also be used for color by providing a plurality of photosensitive emulsion layers each having a different spectral sensitivity range, in which case the coupler can form cyan, magenta and yellow color images in each of the photosensitive emulsion layers. can be contained. Useful examples of the above-mentioned yellow dye-forming couplers include benzoylacetanilide type, pivaloylacetanilide type, and two-equivalent type yellow couplers in which the carbon atom at the coupling position is substituted with a so-called split-off group which can be separated during the coupling reaction. Useful magenta dye-forming couplers include pyrazolone, pyrazolotriazole, pyrazolinobenzimidazole, indazolone, and two-equivalent magenta couplers having a split-off group. Next, cyan dye-forming couplers include phenolic, naphthol, pyrazoquinazolone,
Alternatively, a 2-equivalent cyan coupler having a split-off group is useful. In addition, it is useful to use ultraviolet absorbers such as thiazolidone, benzotriazole, acrylonitrile, and benzophenone compounds to prevent fading of dye images due to short-wavelength actinic rays. 327, same
328 (all manufactured by Ciba Geigy) alone or in combination is advantageous. Any support can be used for the silver halide photographic material according to the present invention, but typical supports include polyethylene terephthalate film, polycarbonate film, polystyrene film, and polypropylene, which are subbed-treated as necessary. Film, cellulose acetate film, glass, Paraita paper, polyethylene laminate paper, etc. In addition to gelatin, the silver halide photographic material according to the present invention may contain a suitable gelatin derivative depending on the purpose. Examples of suitable gelatin derivatives include acylated gelatin, guanidylated gelatin, carbamylated gelatin, cyanoethanolated gelatin, and esterified gelatin. In addition, in the present invention, other hydrophilic binders may be included depending on the purpose. In addition to gelatin, suitable binders include colloidal albumin, agar, gum arabic, dextran, alginic acid, and acetyl-containing 10-20% % hydrolyzed cellulose acetate, polyacrylamide, imidized polyacrylamide, casein, vinyl alcohol polymers containing urethane carboxylic acid groups or cyanoacetyl groups, such as vinyl alcohol-vinylamino acetate copolymers, polyvinyl alcohol, These include polyvinylpyrrolidone, hydrolyzed polyvinyl acetate, polymers obtained by polymerizing proteins or saturated acylated proteins with monomers having vinyl groups, polyvinylpyridine, polyvinylamine, polyaminoethyl methacrylate, polyethyleneamine, etc., and are used in emulsion layers or intermediate layers. The hydrophilic binder can be added to the constituent layers of silver halide photographic materials, such as layers, protective layers, filter layers, and backing layers, depending on the purpose.Additionally, suitable plasticizers and lubricants can be added to the hydrophilic binder, depending on the purpose. etc. can be contained. Further, the constituent layers of the silver halide photographic light-sensitive material according to the present invention can be hardened with any suitable hardening agent. These hardeners include chromium salts, zirconium salts, aldehyde-based hardeners such as formaldehyde and mucohalogen acids, halotriazine-based hardeners, polyepoxy compounds, ethyleneimine-based hardeners, vinyl sulfone-based hardeners, and acryloyl-based hardeners. Can be mentioned. Further, the silver halide photographic light-sensitive material according to the present invention includes an emulsion layer, a filter layer, an intermediate layer, an emulsion layer, a filter layer, an intermediate layer,
In addition to each layer such as a protective layer, a subbing layer, a backing layer, and an antihalation layer, it is possible to provide a large number of various photographic constituent layers as required. The silver halide photographic material according to the present invention can be effectively applied to various uses such as black and white general use, X-ray use, color use, false color use, printing use, infrared use, micro use, and silver dye bleaching use. You can also
U.S. Patent No. 3087817, U.S. Patent No. 3185567, U.S. Patent No.
No. 2983606, No. 3253915, No. 3227550, No. 3227551, No. 3227552, No. 3415644,
Same No. 3415645, Same No. 3415646, Same No. 3594164,
Same No. 3594165, Same No. 3573043, Same No. 3647437,
Same No. 3928312, No. 4135929, No. 4198235,
It can also be applied to color image transfer methods, color diffusion transfer methods, etc. as described in British Patent No. 4336322 and British Patent No. 1496363. The present invention will be illustrated below with reference to Examples, but the embodiments of the present invention are not limited thereto. Example 1 An internal latent image type silver chloroiodobromide emulsion was prepared by a halogen conversion method according to the method described in Example 1 of US Pat. No. 2,592,250. Separately, as a magenta coupler, 40 g of 1-(2,4,6-trichlorophenyl)-3-(2-chloro-5-octadecylsuccinimideanilino)-5-pyrazolone was added to 2,
The mixture was mixed and dissolved with 1 g of 5-di-tert-octylhydroquinone, 75 g of dioctyl phthalate, and 30 g of ethyl acetate, and added to an aqueous gelatin solution containing sodium isopropylnaphthalenesulfonate for emulsification and dispersion. Pre-pigment this emulsion; Emulsion 1 (silver chlorobromide) spectrally sensitized by
(contains 0.35 mol), and further contains 4-hydroxy-6
-Methyl-1,3,3a-7-tetrazaindene
0.5 g and 3 mg of the fogging agent shown below were added. (fogging agent) A fog accelerator shown in Table 1 below was added to this emulsion, which was coated on a resin-coated paper support and dried. After imagewise exposure of these samples, development was performed at 30° C. for 2 minutes and 30 seconds, 3 minutes, and 3 minutes and 30 seconds using a developer having the composition shown below. Then, it was stopped, bleached and fixed, and washed with water according to a conventional method. (Color developer) Potassium carbonate 25g Potassium bromide 1g Benzyl alcohol 10g Potassium sulfite 2.5g 5-Methylbenzotriazole 10mg 4-Amino-3-methyl-N-ethyl-N-
(β-methanesulfonamidoethyl) Alinin sulfate 4.5g Prepare in 1 with water. PH (potassium hydroxide preparation) 12.0 The results obtained are shown in Table 1 below.

【table】

[Table] The above results indicate that the internal latent image type silver halide photographic light-sensitive material containing the compound of the present invention has a higher maximum density than the comparative sample and can obtain sufficient image density in a shorter time. Recognize. Example 2 A photosensitive sheet was prepared by sequentially coating the following layers on an opaque film support made of polyethylene terephthalate. (1) A gelatin layer containing a magenta dye image-forming compound as described below. (2) A green-sensitive internal latent image direct positive silver bromide emulsion (prepared similarly to Emulsion C described in Example 1 of U.S. Pat. No. 3,761,276, containing an internal latent image spectrally sensitized with a sensitizing dye) type emulsion), the fogging agent used in Example 1 and the exemplary compound (1) of the present invention, or US Pat. No. 3,227,552 in place of the compound of the present invention.
A layer containing potassium 2-octadecylhydroquinone-5-sulfonate (comparative compound-1) described in the specification of the above specification in accordance with the description in Table 2 below. (3) Gelatin Protective Layer A dye image receiving sheet was then prepared by coating the following layers in the order listed onto an opaque paper support. (1) Copolymer of sterene, N,N-dimethyl-N-benzyl-N-p-(methacroylaminophenyl)methylammonium chloride and divinylbenzene, gelatin and 1-phenyl-4
- An image-receiving layer made of hydroxymethyl-4-methyl-3-pyrazolidinone. (2) Gelatin interlayer containing UV absorbers. (3) Gelatin protective layer The photosensitive sheet was subjected to imagewise exposure, immersed in an activator solution having the composition shown below for 15 seconds, and then passed between a pair of pressure rollers and overlaid on the image-receiving sheet (lamination). Treatments were carried out at 24°C. (Activator composition) Potassium hydroxide 56.2g 5-methylbenzotriazole 7.2g 11-aminoundecanoic acid 2.0g Potassium bromide 2.0g Adjusted to 1 with water. After 3 minutes, the photosensitive sheet and image-receiving sheet were peeled off. The maximum density of the magenta dye transfer image obtained on the image-receiving sheet is shown in Table 2 below.

[Table] From the results in the above table, the samples containing the compounds of the present invention in the light-sensitive materials for diffusion transfer method (Nos. 25 to 27) were more effective than the samples containing the comparative compounds (Nos. 22 to 24). It has been made clear that excellent maximum density can be obtained within a short period of time with the use of a small amount of fogging agent, and even with a small amount of fog accelerator content, and the compound of the present invention can also be used in diffusion transfer photosensitive materials. It was also found to have an excellent maximum concentration. Effects of the Invention The internal latent image type direct positive silver halide photographic light-sensitive material containing the compound of the present invention in its constituent layers can provide a direct positive image with a high maximum density by short-term development.

Claims (1)

[Scope of Claims] 1. An internal latent image type direct positive silver halide photographic light-sensitive material, characterized in that it has a mechanical layer containing a compound represented by the following general formula [I] on a support. General formula [I] [In the formula, R ¹ is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkyl group having 1 to 4 carbon atoms substituted with a carboxyl group, an amino group, a carbamoyl group, or a hydroxy group, or [Formula] (wherein m represents an integer from 0 to 2), R ² represents -OM (where M represents a hydrogen atom or an alkali metal atom) or an amino group, and R ³ and R ⁴ may be the same or different. It often represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an acetyl group substituted with an amino group, or [Formula] (where n represents an integer of 0 to 1). ]