JPH0560853B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a silver salt diffusion transfer method. More specifically, the present invention relates to a so-called peel-apart type image receiving element for use in a silver salt diffusion transfer method. (Prior Art) The image receiving element and photosensitive element for forming a transferred image by the silver salt diffusion transfer method and the chemical reaction mechanism leading to image formation are well known. Among them, the image receiving element for the peel-off type diffusion transfer method is a photographic film unit integrated with a photosensitive sheet,
That is, a photosensitive sheet having at least one light-sensitive silver halide emulsion layer on a support, an image receiving sheet having at least an image receiving layer on another support, and a processing liquid that contains a processing liquid between these two sheets and can be ruptured by pressure. It is most commonly used in the form of a film unit consisting of a silver halide emulsion layer and a silver halide emulsion layer. By passing the film unit between pressure rollers, the processing container is ruptured and the processing liquid is spread between the two sheets, thereby performing development.
During this time, the photosensitive sheet remains photosensitive, so it is necessary to provide not only the photosensitive sheet but also the image-receiving sheet with a light-shielding layer containing an opacifying agent, or to use a support incorporating an opacifying agent. As a result of this development, a transferable silver complex is formed and diffuses imagewise to form a transferred silver image in the image-receiving layer on the other support. The image-receiving sheet is peeled off from the photosensitive sheet in order to obtain the desired positive print or slide, but the peeled image-receiving sheet may be affected by its constituent layers such as the neutralization layer and image-receiving layer, as well as its coating history. Curls occur during storage after peeling. Furthermore, since the opacifying agent contained in the light-shielding layer is generally a black pigment such as carbon black, it is not very desirable for the outermost layer from an aesthetic point of view. (It also has drawbacks such as poor writing ability with pencils, etc.) In order to improve the above drawbacks, hydrophilic polymers and carbon black, etc. are sequentially added to the back side of the image receiving sheet (the side that does not have an image receiving layer). A U.S. patent discloses the provision of a light-shielding layer containing a black pigment and a layer containing a white pigment such as titanium oxide and a water-insoluble polymer.
No. 3752692, Japanese Patent Application Publication No. 47-37519, British Patent No. 1388576
However, since this method uses different materials such as a hydrophilic polymer and a water-insoluble polymer, simultaneous multilayer coating may cause aggregation or repellency at the interface, which is inconvenient. must be applied in a single layer. This is quite disadvantageous in terms of cost. The image-receiving element has, on the back side of the image-receiving sheet, at least (1) a light-shielding layer containing a black pigment and a hydrophilic colloid, and (2) a light-reflecting layer containing a white pigment and a hydrophilic colloid, thereby providing light-shielding and curl-preventing properties. , and the writing properties are improved, and furthermore, simultaneous multilayer coating of the light-shielding layer and the light-reflecting layer becomes possible. However, the above
In the layer structures (1) and (2), immediately after the image-receiving sheet is peeled off from the photosensitive sheet, curling is likely to occur because the image-receiving layer absorbs moisture in the processing liquid. It was found that when heat is applied with a hair dryer to rapidly reduce the water content in the treatment solution in order to quickly remove curls, the back side layer cracks. It has been found that the diffusion transfer process has the disadvantage that the back layer cracks during the process because it is squeezed by the process roller, resulting in light leakage. (Problems to be solved by the invention) In order to further improve the above-mentioned drawbacks,
-48845 discloses that the weight ratio of black pigment/hydrophilic colloid in the light-shielding layer is 1.5 or less, and the weight ratio of white pigment/hydrophilic colloid in the white layer is 6 or less. JP-A-61-48844 discloses that a light-shielding layer and/or a white layer contain a polyol and spherical particles having a glass transition point (Tg) of 30° C. or lower. Furthermore, JP-A-61
No. 48843 discloses that a light-shielding layer and/or a light-reflecting layer contains a polyol, and a protective layer containing a matting agent is provided on the light-reflecting layer. Although these methods have shown remarkable improvement effects, for example, as the white pigment/hydrocolloid weight ratio of the white layer is lowered, the degree of whiteness decreases, leading to a decrease in the impression of the product as a product. Furthermore, if polyol is added to prevent cracking, the polyol may migrate from the back side to the image-receiving layer side in the rolled state, or the polyol may ooze out and contaminate the roller when the image-receiving element is processed into a film unit. It has been found that this may cause malfunctions such as (Object of the Invention) An object of the present invention is to provide an image receiving element for silver salt diffusion transfer method, which contains a back layer having sufficient light-shielding properties, anti-curling properties, and writing properties. . Another object of the present invention is to provide an image-receiving element for silver salt diffusion transfer method in which the back layer has a high degree of whiteness. Another object of the present invention is to provide an image-receiving element for silver salt diffusion transfer, which has a back layer with good heat resistance. Another object of the present invention is to provide an image-receiving element for silver salt diffusion transfer that has a light blocking ability even under low humidity. Another object of the present invention is to provide an image-receiving element for silver salt diffusion transfer that is free from contamination by a back layer. It is a further object of the present invention to provide a photographic film unit for use in a peel-off type diffusion transfer method that includes such an image-receiving element. (Means for Solving the Problems) As a result of extensive research, the present inventors have developed an image receiving element for silver salt diffusion transfer method having an image receiving layer containing a silver precipitant on a support. At least sequentially (1) black pigment and hydrophilic colloid on the side without a layer (back side) and a glass transition point (Tg) of 30℃
(2) A light-shielding layer containing at least the following spherical particles and having a black pigment/hydrophilic colloid weight ratio of 1.5 to 0.1; It has been found that the above object can be effectively achieved by an image receiving element for silver salt diffusion transfer method, which is characterized by being provided with a light reflecting layer. The black pigment used in the present invention is preferably carbon black. As a raw material for carbon black, any manufacturing method such as channel, thermal, and furnace can be used; the particle size of carbon black is not particularly limited, but
~1800 Å is preferred. Also, JP-A-59-
Grafted carbon black as described in No. 97142 may also be used. Further, as the white pigment, titanium oxide, barium sulfate, and zinc oxide are preferable. Particularly preferred is titanium oxide, and titanium oxide surface-treated with silica and/or alumina, zinc oxide, a silane coupling agent, etc. is particularly preferred. The hydrophilic colloid used in the present invention is preferably gelatin, phthalated gelatin, polyvinyl alcohol, polyethylene oxide, polyacrylamide, polyvinylpyrrolidone, polyethyleneimine, polyacrylic acid, cellulose derivatives such as hydroxyethylcellulose, carboxymethylcellulose, etc. . Particularly preferred is gelatin. The light-shielding layer of the present invention may contain black pigment/
The hydrophilic colloid weight ratio is 1.5 to 0.1, preferably 1.0 to 0.2. Unexpected and significant effects can be achieved by skillfully combining them outside the particularly preferred range described in JP-A-61-48844. The amount of black pigment added as a light-shielding agent may be adjusted depending on the sensitivity of the light-sensitive material to be light-shielded, but it is preferably about 5 to 10 in terms of optical density. The light-reflecting layer of the present invention has a white pigment/hydrophilic colloid weight ratio of 8.5 to 15, from the viewpoint of intralayer adhesion (cohesive failure may occur within the layer).
Preferably it is 8.5-10. The amount of white pigment added as a light reflecting agent may be adjusted appropriately depending on, for example, how much writability is required.
From the protective role of the light-shielding layer and writability, etc.
1.0 to 15 g/ ^m2 is used, preferably 3 to 10 g/ ^m2 . In addition, if a material with high hardness such as titanium oxide is on the outermost layer, when friction occurs with a material with low hardness, it may be scraped off and adhered to the surface, staining the film. It is preferable to further provide a protective layer containing a hydrophilic colloid on the upper layer. Since this protective layer is made of a hydrophilic colloid, it can be coated in three layers simultaneously, including a light-shielding layer and a light-reflecting layer. The spherical particles used in the present invention have a Tg of 30°C or less, more preferably a Tg of 10°C or less. Examples of the spherical particles used include polyisoprene, polyethylene, polypropylene, polyethyl acrylate, polybutyl acrylate, polysec-butyl acrylate, polypropyl acrylate, polyhexyl acrylate,
Polymethoxybutyl acrylate, poly N-octylacrylamide, polybutyl methacrylate, poly-2-ethylhexyl methacrylate,
Polyoctadecyl methacrylate, poly(vinylidene chloride-co-acrylonitrile-co-acrylic acid) (85:12:3 mole%), polyvinyl acetate, poly(styrene-co-butadiene-co-acrylic acid)
(40:58:2mole%), poly(methyl methacrylate-co-butyl acrylate) (30:70mole%),
Poly(ethyl methacrylate-co-ethyl acrylate) (50:50 mole%), poly(butyl acrylate-co-2-acrylamido-2-methylpropanesulfonic acid) (98:2 mole%), poly(ethyl acrylate-co-acrylic) Acid (97:3mole
%), poly(butyl methacrylate-co-butyl acrylate-co-maleic acid) (40:59:
1mole%) polymethyl methacrylate-co-butyl acrylate-co-ethyl acrylate)
(30:50:20mole%) and other
Latexes described in Research Disclosure July 1980, 19551 and having a Tg of 30°C or less may also be used. Particularly preferred are polyethyl acrylate, polybutyl acrylate, and polypropyl acrylate. The size (diameter) of spherical particles is
0.001-1 μm is preferable. More preferably 0.005
~0.5μm. More preferably, from 0.01 to
It is 0.1 μm. From the viewpoint of cracking and applicability, the spherical particles/hydrophilic binder (weight ratio) is preferably 1.0 to
It is 0.01. More preferably, it is 0.5 to 0.1. Spherical particles can be produced by a method well known to those skilled in the art, such as a conventional emulsion polymerization method or emulsion of a synthetic resin. When preparing these, reference may be made to Synthetic Resin Emulsion (Kobunshi Kankankai) edited by Taira Okuda and Hiroshi Inagaki. Further, in order to impart adhesion resistance to the back layer of the present invention, it is preferable to add a matting agent to the above-mentioned protective layer. Preferred examples of the matting agent include organic compounds such as water-dispersible vinyl polymers such as polymethyl methacrylate, cellulose acetate propionate, and starch. As the inorganic compound, silver halide, barium strontium sulfate, calcium carbonate, silicon dioxide, magnesium oxide, titanium oxide, etc. are preferably used. As a matting agent, a polymer having a glass transition point (Tg) higher than 30°C is preferable, and furthermore, a Tg is 50°C.
The above are more preferred. Examples of polymers with Tg greater than 30°C include polymethyl methacrylate, polyethyl methacrylate, poly sec-butyl methacrylate, poly tert-butyl methacrylate, polyadamantyl methacrylate, poly
iso-propyl methacrylate, poly tert-butyl acrylate, polyacrylonitrile, polymethacrylonitrile, polyvinyl benzoate, polystyrene, poly-4-bromstyrene, poly-4-
Chlorstyrene, poly-4-methoxystyrene,
Poly-(methyl methacrylate-co-butyl methacrylate) (85:15 mole%), poly(styrene-co-ethyl methacrylate) (80:20 mole ratio),
Poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid) (80:18:2 mole%),
Poly(ethyl methacrylate-co-butyl methacrylate-co-maleic acid) (75:23:2mole
%), poly(methyl methacrylate-co-butyl methacrylate-co-2-acrylamide-2-
Methylpropanesulfonic acid) (80:17:3mole
%), poly(styrene-co-butyl methacrylate-co-2-hydroxyethyl methacrylate)
(70:25:5 mole%), poly(methyl methacrylate-co-butyl acrylate-co-acrylamide) (77:21: mole%), poly(ethyl methacrylate-co-butyl methacrylate-co-methacryloyloxypropanesulfonic acid) ) (70:
28:2mole%). Particularly preferred is polymethyl methacrylate. If the size of the matting agent particles is too large, problems will arise due to sinking of the particles into the light-shielding layer and light-shielding leakage (pinholes) due to simultaneous multilayer coating. Preferably, the particle size (as the diameter of spherical particles) of the matting agent particles is not larger than 15 μm, and the average particle size is 1 μm to 10 μm. More preferably, the average particle size is 1 μm or more
It is 5μm. More preferably, the average particle size is 2
~4 μm. The particle size distribution of the matting agent particles used in the present invention may be broad or narrow. However, as mentioned above, in order not to cause insufficient light-shielding ability (optical pinholes), it is important not to contain particles larger than 15 μm, while on the other hand, particles with a particle size of 0.1, which is practically ineffective for improving adhesion resistance, should not be included. It must not contain anything smaller than μm. That is, the preferred particle size distribution is 0.1 μm to 15 μm. More preferably, it is 0.5 to 10 μm. More preferably 1μm
~10μm. The protective layer of the present invention preferably has a matting agent particle/hydrophilic colloid weight ratio of 3 to 0.1.
It is. More preferably, it is 1.5 to 0.2. Further, the back layer used in the present invention is preferably water resistant, and for that purpose, a hardening agent is preferably added (it does not matter which back layer it is added to). Hardeners well known to those skilled in the art can be used, but the amount added is preferably 0.3 to 7% by weight based on the total hydrophilic colloid. The support used in the present invention may be transparent or opaque, but is preferably one that does not undergo significant dimensional changes during processing. Examples of such supports include cellulose acetate film used in ordinary photographic materials, polystyrene film, polyethylene terephthalate film, polycarbonate film, baryta paper, and water-impermeable polymers such as polyethylene that cover the surface of the paper. Examples include paper laminated with In order to obtain a white background, a whitening agent such as titanium oxide or barium sulfate may be added to the support, or the above-mentioned whitening agent may be coated onto the support. In a preferred embodiment of the image-receiving layer constituting the image-receiving sheet of the present invention, in the silver salt diffusion transfer method, a substance (called a silver precipitant substance or a development nucleus) that catalyzes the reduction reaction of a water-soluble silver complex is treated with an alkaline treatment composition. This is a layer contained in a material-permeable binder. Silver precipitating substances include zinc, mercury, lead, cadmium, iron, chromium, nickel, tin, cobalt,
All conventionally known silver precipitating agents can be used, such as heavy metals such as copper, noble metals such as palladium, platinum, silver, and gold, or sulfides, selenides, and tellurides of these metals. These silver precipitant materials can be used either by reducing the corresponding metal ion to create a metal colloidal dispersion or by mixing a metal ion solution with a soluble sulfide, selenide or telluride solution to form a water-insoluble metal. It is obtained by making a colloidal dispersion of a sulfide, metal selenide or metal telluride. To obtain an image-receiving element giving a favorable tone image, these silver precipitant materials are usually present in the image-receiving layer in an amount of 10 ^-10 to 10 ^-5 g/cm ² , preferably 10 ^-8 to 10 -5 g/cm 2 .
Contains 10 ^-6 g/ ^cm2 . The above-mentioned binders include hydrophilic binders such as gelatin, polyvinyl alcohol, carboxymethylcellulose, methylcellulose, etc., but particularly suitable are binders made of alkali-impermeable polymers made alkali-permeable by decomposition. Decomposable alkali-impermeable polymers include, for example, cellulose triacetate, cellulose diacetate, cellulose propionate,
Examples include cellulose esters such as cellulose acetate butyrate, and polyvinyl esters such as polyvinyl acetate, polyvinyl propionate, and polyvinyl chloroacetate. An alkali-impermeable polymer layer made of at least one of these polymers is decomposed by an alkaline solution,
Permeable to alkali. In addition, polyvinyl acetals such as polyvinyl formal, polyvinyl acetal, and polyvinyl butyral can also be used. In this case, it can be made permeable to alkali by acidic hydrolysis. To make an alkali-impermeable polymer layer alkali-permeable by alkaline decomposition, add an alkali such as sodium hydroxide, potassium hydroxide, lithium hydroxide, or tetraalkylammonium hydroxide, and an alcohol such as methanol or ethanol to
A saponification solution dissolved in alcohol (aqueous solution) containing 100% concentration is prepared, and this saponification solution is brought into contact with an alkali-impermeable polymer layer such as cellulose ester. As a contacting method, any conventionally known contact means such as brush application, roller application, air knife application, spray application, or immersion in a saponification solution bath can be applied. At least the surface of the alkali-impermeable polymer layer is saponified by contact with the saponification liquid. The saponified layer becomes permeable to alkali and can be penetrated by a diffusion transfer processing solution. To prepare an image-receiving layer for the silver salt diffusion transfer method, cellulose ester, such as cellulose diacetate, is impregnated with a silver precipitant by vapor deposition, and then coated on a support and decomposed with alkali, or in a cellulose ester solution. For example, one method involves reacting silver nitrate and sodium sulfide to create a silver precipitant on the spot, coating it on a support, and then decomposing it with alkali, and simultaneously decomposing a cellulose ester layer coated on the support with alkali. A method of embedding a silver precipitant in the decomposed layer, and a method of reacting, for example, chloroauric acid with a reducing agent in the decomposed layer after alkali decomposition of the cellulose ester layer to produce regenerated cellulose. A method of creating a silver precipitant can be used. It is preferable to use a film-forming acidic polymer for the neutralizing layer that can be used in the image-receiving sheet of the present invention, and any such acidic polymer can be used. Examples of acidic polymers include copolymers of maleic anhydride, such as styrene-maleic anhydride copolymers, methyl vinyl ether-maleic anhydride copolymers, ethylene-maleic anhydride copolymers, and copolymers of maleic anhydride and ethylene. Monobutyl ester of a polymer, monobutyl ester of a copolymer of maleic anhydride and methyl vinyl ether, monoethyl ester of a copolymer of maleic anhydride and ethylene, monopropyl ester of the same copolymer, Monopentyl ester, monohexyl ester of the same copolymer, monoethyl ester of the copolymer of maleic anhydride and methyl vinyl ether, monopropyl ester of the same copolymer, monobenzyl ester of the same copolymer, same copolymer polyacrylic acid: polymethacrylic acid: copolymers of acrylic acid and methacrylic acid in various ratios: acrylic acid or methacrylic acid with other vinyl monomers, such as acrylic esters (e.g. butyl acrylate); etc.), methacrylic acid esters, vinyl ethers, acrylamides, methacrylamides, etc., preferably with an acrylic acid or methacrylic acid content.
A copolymer of 50 to 90 mol % can be used. Among these acidic polymers, it is preferable to use polyacrylic acid, acrylic acid-butyl acrylate copolymer, or maleic anhydride-methyl vinyl ether copolymer. The various polymers mentioned above may be used alone or in combination of two or more. Further, for the purpose of increasing membrane strength, etc., the above-mentioned acidic polymer may be used in combination with a cellulose derivative such as acetyl cellulose or other polymers. For example, gelatin, polyvinyl alcohol, polyacrylamide, partially hydrolyzed polyvinyl acetate, a copolymer of β-hydroxyethyl methacrylate and ethyl acrylate, or acetyl cellulose are used as main components in the neutralization timing layer. , other U.S. Patent No. 3455686,
No. 3421893, No. 3785815, No. 3847615, No. 3847615, No.
4009030, JP-A-52-14415, etc. can also be used. Furthermore, the above neutralization timing layer and, for example, US Pat. No. 4,056,394, US Pat.
No., JP-A-53-72622 or JP-A-54-78130
It is also possible to use a polymer layer whose permeation of an alkaline processing liquid has a large temperature dependence as described in the above publication. Additionally, polymerization products of monomers that can undergo β-elimination in an alkaline environment can also be used in the neutralization timing layer. As an embodiment of the image-receiving sheet for silver salt diffusion transfer, the undecomposed portion of the cellulose ester layer containing acetylcellulose is suitable for improving the color tone, stability, or other photographic properties of the silver transfer image. It may also contain one or more mercapto compounds. Such mercapto compounds are utilized during imbibition by diffusing from the position where they are initially placed. This type of image receiving element was developed by Richard D.
W.Young) U.S. Patent No. 3607269 and patent application 1983-
Described in No. 148979. In addition, if necessary, a layer of decomposed cellulose ester containing a silver precipitant and a lower layer of cellulose ester or partially decomposed cellulose ester (which may contain the above-mentioned mercapto compound)
Another hydrophilic polymer layer may be provided between the layers. Polymers used in this hydrophilic polymer layer include, for example, gelatin, derivative gelatin (such as phthalated gelatin), and sugars (such as starch, galactomannan, gum arabic, hydroxyethylcellulose, methylcellulose, carboxymethylcellulose, pullulan, and hydroxypropylcellulose). , hydrophilic synthetic polymers (e.g., polyacrylamide, polymethylacrylamide, polyN-vinylpyrrolidone, 2
-hydroxyethyl methacrylate, etc.). Although the image-receiving sheet of the present invention may further include a photosensitive layer on the same support, it is preferable that the image-receiving sheet does not include a photosensitive layer. That is, the photosensitive layer is preferably a component of a photosensitive sheet coated on a support separate from the image-receiving sheet, and in particular, the image-receiving sheet and the photosensitive sheet contain a processing liquid between them. Preferably, it is in the form of a photographic film unit having a pressure rupturable processing liquid container. The image-receiving element may contain various additives, such as hardeners, fluorescent brighteners, coating aids, if desired. As the photosensitive element, those conventionally known in the field of silver salt diffusion transfer method are used. The silver halide photographic emulsion contained in the light-sensitive element is preferably silver bromide,
Silver halide grains with a silver halide composition of silver iodobromide and an average grain size of 3μ or less,
This is a silver halide photographic emulsion consisting of silver halide grains in which latent images are mainly formed on the grain surfaces. Further, as a binder, a hydrophilic colloid such as gelatin is usually used. The silver halide photographic emulsion described above is preferably chemically sensitized and further spectrally sensitized with methine dyes. Furthermore, compounds such as azoles are usually added to the above-mentioned photographic emulsions for the purpose of preventing fog or stabilizing photographic performance. The photosensitive element preferably has a hydrophilic colloid layer (for example, a protective layer) other than the photographic emulsion layer on the support, and the photographic emulsion layer or other hydrophilic colloid layer contains a coating aid, an antistatic agent, Matting agents, plasticizers, development accelerators, hardeners, filter dyes, ultraviolet inhibitors, etc. can be added. As the developing agent used in the present invention, it is preferable to use hydroxyamine developers such as N,N-diethylhydroxylamine, N,N-bis-methoxyethyl-hydroxylamine, and N,N-bis-ethoxyethyl-hydroxylamine. .
A phenidone compound may be used in combination as an auxiliary developer. The processing compositions used in the present invention preferably include silver halide solvents such as U.S. Pat. No. 2,857,274;
Contains cyclic imides (for example, uracil, urazol, 5-methyluracil) described in No. 2857275 and No. 2857276. Processing compositions typically contain alkalis (e.g. alkali metal hydroxides, e.g. sodium hydroxide, potassium hydroxide), polymeric film formers (e.g. hydroxyethyl cellulose, sodium carboxymethyl cellulose), and further include silver salt diffusion transfer techniques. It may contain other compounds known in the art, such as antifoggants, toning agents such as mercapto compounds, and stabilizers such as oxyethylamino compounds. (Example) The present invention will be explained in further detail below by giving Examples and Comparative Examples. Example 1 Preparation of image-receiving sheet 1 Preparation of image-receiving sheet (1) An image-receiving sheet (1) was prepared by sequentially providing the following layers on a polyethylene laminate paper support. The numbers in parentheses indicate the coating amount in g/m ² . 1) Neutralization layer: Cellulose acetate (degree of acetylation 53%) (6), methyl vinyl ether-maleic anhydride copolymer (4), Uvitex OB (trade name of Ciba Geigy) (0.04) 2) Medium Japanese timing layer: Cellulose acetate (degree of acetylation 55%) (8.5), 1-
(4-hexylcarbamoylphenyl)-2,3
-dihydroimidazole-2-thione (0.06) 3) Image-receiving layer: Cellulose acetate (degree of acetylation 53%) (1.5), palladium sulfide (7.5×10 ^-4 ), 1-(4-hexylcarbamoyl phenyl)-2 , 3-dihydroimidazole-2-thione (0.02) was applied, and then saponified from the surface using a sapon solution prepared by dissolving 9.0 g of sodium hydroxide in 300 ml of methanol to obtain an image-receiving layer. 4) Release layer: Butyl methacrylate-acrylic acid copolymer (molar ratio 15:85) (0.03) On the back side of the support containing the image-receiving layer prepared in this way, a back layer as shown in Table 1 below is applied. Image receiving sheets 1-1 to 1-12 were prepared by coating the layers. Preparation of photosensitive sheet Silver halide grains are formed by a single jet method, physically ripened by a conventional method, desalted, and further chemically ripened to form a silver iodobromide emulsion (containing 6.5 to 6.0 mol% of iodide). Obtained. The average diameters of the silver halide grains contained in this emulsion were 1.3 microns and 0.6 microns. 1 kg of this emulsion contained 0.65 mol and 0.55 mol of silver halide. and emulsion of 1 kg each.
10% gelatin 3 collected in 50g pots and added
Kg was dissolved in a constant temperature bath at 50°C. and the ortho-sensitizing dye 3-{5-chloro-2
-[2-ethyl-3-(3-ethyl-2-benzothiazolinylidene)propenyl]-3-benzoxazolio}propane-sulfonate, panchromatic sensitizing dye (4-[2-[(3-ethylbenzo thiazoline-(2-ylidene)-2-methyl-1-propenyl]-3-benzothiazolio}butane-sulfonate) and 4-hydroxy-6-methyl-1,3,
1% by weight aqueous solution of 3a,7-tetrazaindene10
ml, 10ml of a 1% aqueous solution of 2-hydroxy-4,6-dichlorotriazine sodium salt, 10ml of a 1% aqueous solution of sodium dodecylbenzenesulfone, and 10ml of a 0.1% methanol solution of lipoic acid.
and were mixed and stirred at 40°C (finished emulsion). In addition, 400 g of emulsion and 500 g of emulsion were collected in pots, and dissolved in a constant temperature bath at 50° C. together with 10 kg of 10% gelatin added. and the ortho-sensitizing dye 3-{5-chloro-2
-[2-ethyl-3-(3-ethyl-2-benzothiazolinylidene)propenyl]-3-benzoxazolio}propane-sulfonate, panchromatic sensitizing dye (4-[2-[(3-ethylbenzo thiazoline-(2-ylidene)-2-methyl-1-propenyl]-3-benzothiazolio}butane-sulfonate) and 4-hydroxy-6-methyl-1,3,
1% by weight aqueous solution of 3a,7-tetrazaindene10
ml, 10 ml of a 1 wt% aqueous solution of sodium 2-hydroxy-4,6-dichlorotriazine salt, 10 ml of a 1 wt% aqueous solution of sodium dodecylbenzenesulfonate, and 10 ml of a 0.1 wt% lipoic acid solution in methanol.
and were mixed and stirred at 40°C (finished emulsion). The finished emulsions () and () were applied to a primed titanium dioxide-containing polyethylene terephthalate film base with a silver content of () 0.5 g/m ² and ().
A sample was obtained by coating and drying at a concentration of 0.1 g/m ² . At the same time, polymethyl methacrylate latex (average size 3.5 μm) was added to the gelatin aqueous solution and coated to a dry film thickness of 1 μm.

【table】

[Table] (1) Evaluation of cracks and light fog due to diffusion transfer under low humidity. An unexposed photosensitive sheet and an image receiving sheet were stacked together and left in a constant temperature and humidity room at 25°C and 15% RH for 3 hours. Under these conditions, the above processing liquid contained in the processing liquid container is exposed to 10,000 lux of light.
The processing liquid was spread between the photosensitive sheet and the image-receiving sheet by squeezing it with a spreading roller to a thickness of 0.04 mm. After 40 seconds of development, the photosensitive sheet and image-receiving sheet were peeled off, and optical fog due to cracks in the back layer was evaluated based on the presence or absence of white spots in the transferred image. (2) Pinhole test After overlapping an unexposed photosensitive sheet and an image-receiving sheet and shielding the periphery from light, 100,000 lux light was irradiated from the back layer side of the image-receiving sheet for 30 seconds. The above-mentioned processing liquid was squeezed with a developing roller to a thickness of 0.04 mm, and the processing liquid was spread between the photosensitive sheet and the image-receiving sheet. After 40 seconds of development, the photosensitive sheet and image-receiving sheet were peeled off, and pinholes in the back layer were evaluated based on the presence or absence of white spots in the transferred image. The treatment was carried out at 25°C and 55%RH.

【table】

[Table] ×: Yes Table 2 shows that only the combination of the light-shielding layer and white layer of the present invention was applied to the image-receiving sheet without any contamination from the back layer (no glycerin added), without cracking at low humidity, and without pinholes. It has become clear that it is possible to provide (Effect of the invention) Silver salt diffusion transfer with a light-shielding layer consisting of a black pigment/hydrophilic colloid weight ratio within a specific range and a light reflecting layer consisting of a white pigment/hydrophilic colloid weight ratio within a specific range on the back side. By employing the structure of the present invention, which is a legal image receiving element, it is possible to prevent cracks and to obtain excellent light-shielding effects without pinholes.

Claims (1)

[Claims] 1. In an image-receiving element for a silver salt diffusion transfer method having an image-receiving layer containing a silver precipitant on a support, at least sequentially
(1) Contains at least a black pigment, a hydrophilic colloid, and spherical particles with a glass transition temperature (Tg) of 30°C or less, and has a black pigment/hydrophilic colloid weight ratio of 1.5 to 0.1.
(2) a light-shielding layer containing at least a white pigment and a hydrophilic colloid and having a white pigment/hydrophilic colloid weight ratio;
An image-receiving element for silver salt diffusion transfer method, characterized in that it is provided with a light-reflecting layer having a molecular weight of 8.5 to 15.