JPS63247754A - Image receiving element for silver salt diffusion transfer process - Google Patents

Abstract

PURPOSE:To improve the light shading property of the titled element, and to give anti-curling and writing properties to the titled element by providing with a light shading layer having a specified wt. ratio range of a black pigment to a hydrophilic colloid, and a light reflection layer having a specified wt. ratio range of a white pigment to the hydrophilic colloid on the rear surface side of the titled element. CONSTITUTION:The peeling type titled element is mounted an image receiving layer contg. a silver precipitant on a supporting body, and at least the light shading layer and the light reflection layer are provided with the rear surface side of an image receiving sheet in this order. The light shading layer contains at least a spherical particle composed of the black pigment and the hydrophilic colloid and having >=30 deg.C glass transition point (Tg), and has the wt. ratio of the black pigment to the hydrophilic colloid of 1.5-0.1. The light reflection layer contains at least the white pigment and the hydrophilic colloid and has the wt. ratio of the white pigment to the hydrophilic colloid of 8.5-15. Thus, the titled element contg. the back layer having the sufficient light shading property and the anti-curling and writing properties can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a silver salt diffusion transfer method. More specifically, the present invention relates to a so-called peel-off type (Beer-A-Wild type) image receiving element for silver salt diffusion transfer.

(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.

In particular, an image-receiving element for a peel-off 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 and another support. It is most commonly used in the form of a film unit consisting of an image-receiving sheet having at least an image-receiving layer and a processing liquid container containing a processing liquid between these two sheets and rupturable under pressure. In this case, after the silver halide emulsion layer is illuminated in an imagewise manner, the processing container is ruptured and the processing liquid is applied to both sheets, usually by passing the film unit between a pair of juxtaposed pressure rollers. The image is developed and developed in between. 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 impregnated with an opacifying agent.

As a result of this development, a transferable silver complex is formed and imagewise diffuses to form a transferred silver image (fl) in the image-receiving layer on the other support to obtain the desired positive print or slide. Therefore, the image-receiving sheet is peeled off from the photosensitive sheet, but the peeled image-receiving sheet may curl during storage after peeling due to the effects of its constituent layers, such as the neutralizing layer and image-receiving layer, and the coating history. In addition, the opacifying agent contained in the light-shielding layer is generally a black pigment such as carbon black, so it is not very desirable as an outermost layer from an aesthetic point of view (disadvantages such as poor writability with a pencil) In order to improve the above-mentioned drawbacks, a light-shielding layer containing a hydrophilic polymer and a black pigment such as carbon black, titanium oxide, etc. U.S. Patent No. 3.7!Toc No. 1% Kaisho $7 provides a layer containing a white pigment and a water-insoluble polymer.
-37! This method is disclosed in British Patent No. 176, Jl#, etc., but since it uses different materials such as a hydrophilic polymer and a water-insoluble polymer, simultaneous multilayer coating may cause aggregation at the interface and repellency. Since this is inconvenient as it may cause problems, each layer must be coated as 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 sequentially (1) a light blocking layer containing a black pigment and a hydrophilic colloid, and (2) a light reflecting layer containing a white pigment and a hydrophilic colloid. Improved prevention and writability,
Furthermore, simultaneous multilayer coating of a light-shielding layer and a light-reflecting layer becomes possible. However, with the above layer structures (1) and (2), immediately after the image-receiving sheet is peeled off from the photosensitive sheet, the image-receiving layer absorbs moisture in the processing liquid, so it tends to curl. It has been found that when heat is applied with a dryer or the like to rapidly reduce the water content in the processing liquid in order to quickly remove such curls, the back side layer cracks. Furthermore, when diffusion transfer processing is performed under low humidity, the back layer is squeezed by the processing roller, which causes cracking during the processing, resulting in light leakage.

(Problems to be solved by the invention) In order to further improve the above-mentioned drawbacks, JP-A-Sho t/-ar
No. RAS discloses that the weight ratio of black pigment/hydrophilic colloid in the light-shielding layer is set to below /,j, and the weight ratio of white pigment/hydrophilic colloid in the white layer is set to below t. , JP-A No. 67-μm1up discloses that a light-shielding layer and/or a white layer contains a polyol and a glass transition point (Tg).
It is disclosed that spherical particles having a temperature of 0.degree. C. or less are included. Further, JP-A-6/-4CRLUJ discloses that the light-shielding layer and/or the light-reflecting layer contains a polyol, and that a protective layer containing a matting agent is provided on the light-reflecting layer.

Although these methods showed significant 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, adding polyol to prevent cracks may cause the polyol to migrate from the back side to the image-receiving layer side in the rolled state, or when the image-receiving element is processed into a film unit, the polyol may ooze out and contaminate the roller. It has been found that this may cause a malfunction.

(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 that has sufficient light-shielding properties, anti-curl properties, and also has writability. .

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 the silver salt diffusion transfer method that is free from contamination due to the back layer.

It is a further object of the present invention to provide a photographic film unit for peelable diffusion transfer including 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) a black pigment, a hydrophilic colloid, and a spherical particle having a glass transition temperature (Tg) of 30° C. or less are contained on the surface without a layer (back surface), and the black pigment/hydrophilic colloid weight ratio is /, j-
(2) a light-shielding layer containing at least a white pigment and a hydrophilic colloid, and a white pigment/hydrophilic colloid weight ratio of t;

! ~/! 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 method of production such as channel thermal or furnace can be used.Although the particle size of carbon black is not particularly limited, it is preferably PQ~/Ir00. Also, Tokukai Akira! Grafted carbon black as described in No. 271≠λ can also be used. In addition, the white pigment is preferably titanium oxide, barium sulfate,
It is zinc oxide. Particularly preferred are titanium oxide surface-treated with silica and/or alumina, zinc oxide, a silane coupling agent, and the like.

The hydrophilic colloid used in the present invention is preferably gelatin, phthalated gelatin, polyvinyl alcohol,
Cellulose derivatives such as polyethylene oxide, polyacrylamide, polyvinylpyrrolidone, polyethyleneimine, polyacrylic acid, hydroxyethylcellulose, and carboxymethylcellulose. Particularly preferred is gelatin.

For the light-shielding layer of the present invention, the black pigment/hydrophilic colloid weight ratio should be /,!, due to light-shielding ability and film brittleness (causing cracks). ~0. / and preferably #i/
, θ~0.2.

Unexpected and remarkable effects can be realized by skillfully combining them outside the particularly preferred range described in fi-1973-≠rr≠j. The amount of black pigment added as a light-shielding agent may be adjusted according to the sensitivity of the light-sensitive material to be light-shielded, but it is preferably about j to IO in terms of optical density.

The light reflecting layer of the present invention has a white pigment/hydrophilic colloid weight ratio of r, s to it, preferably r,
It is j-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, but considering the protective role for the light shielding layer and writability, etc. zy/door 2 is used, 3~
toy/m2 is preferred.

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 adhere to the surface, staining the film and scratching it. It is preferable to further provide a protective layer containing a hydrophilic colloid on top of the reflective 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, poly-5ec-butyl acrylate, polypropyl acrylate, polyhexyl acrylate, polymethoxybutyl acrylate, polyN-
Octyl acrylamide, polyethyl acrylate, poly λ-ethylhexyl methacrylate, polyoctadecyl methacrylate, poly(vinyritene chloride-coacrylonitrile-coacrylic acid) (13: /, 2
: jmole%), polyvinyl acetate, poly(styrene-cobutadiene-coacrylic acid) (Hiroo: sr
2 mole%), poly(methyl methacrylate)
Coptyl acrylate) (30nia 0m01e%),
Poly(ethyl methacrylate-co-ethyl acrylate) (!0:!Omole%), poly(butyl acrylate-co-2-acrylamide-co-methylpropanesulfonic acid) (ri, r: λmole%), poly(ethyl acrylate-co-acrylic) acid)(ri7:Jmole%
), poly(butyl methacrylate-coptyl acrylate-combaleic acid) (pO:t:/mole)
, polymethyl methacrylate-co-optylacrylate-co-ethyl acrylate)) (JO:!0:20m01
e%), and other Re5search Dis
Latexes described in Closure July 101, 101, and 101, and having a Tg of JO 0 C or lower, may also be used.

Particularly preferred are polyethyl acrylate, polybutyl acrylate, and polypropyl acrylate.

The diameter of the spherical particles is preferably 0°00/-7 μm. More preferably, it is 00 oar to 0.2 μm. Even more preferably, 0. Q/~0. /μ shoulder.

From the viewpoint of cracking and applicability, the spherical particles/hydrophilic binder (weight ratio) is preferably /, 0 to 0.0/. More preferably o, z - 0.1.

The spherical particles can be produced by a method well known to those skilled in the art, such as a conventional emulsion polymerization method or emulsification of a synthetic resin. When preparing these, reference may be made to Synthetic Resin Emulsions (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 retention 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, it has a glass transition point (Tg)! Preferably, the polymer has a Tg greater than 0°C. A temperature of 0°C or higher is more preferable. Examples of polymers with a Tg greater than 30°C include polymethyl methacrylate, polyethyl methacrylate, poly 5ec-butyl methacrylate, polyt
ert-butyl methacrylate, polyadamantyl methacrylate.

Poly 1so-propyl methacrylate, poly tert-
Butyl acrylate, polyacrylonitrile, polyacrylonitrile, polyvinyl benzoate, polystyrene, polygubromustyrene, poly-guchlorstyrene, poly≠-methoxystyrene, poly-(methyl methacrylate-coptyl methacrylate) (rj: /
jmole%).

Poly(styrene-coethyl methacrylate) (tO:
aOmol e ratio), poly(methyl methacrylate-co-ptylacrylate-co-acrylic acid) (to:t
r: 2mole%), poly(ethyl methacrylate-coptyl methacrylate-comaleic acid) (7j:
2J: Jmole%), poly(methyl methacrylate-co-optyl methacrylate-co-acrylamide 2-methylpropanesulfonic acid) (rO: / 7
: jmole%), poly(styrene-coptyl methacrylate-co-λ-hydroxyethyl methacrylate) (7o:Jj:jmole%), poly(methyl methacrylate-co-optyl acrylate-co-acrylamide) (77:2/ :λmole%) ), poly(ethyl methacrylate-co-optyl methacrylate-co-methacryloyloxypronosulfonic acid) (70:21:
2 mole%).

Particularly preferred is polymethyl methacrylate.

The size of the matting agent particles is determined by the sinking of the particles into the light-shielding layer and the light-shielding leakage (pinholes) caused by simultaneous multilayer coating.
If it is too large, inconvenience will occur. Preferably, the particle size of the matting agent particles (as the diameter of spherical particles) does not include particles larger than l and μ door, and the average particle size is as follows:
The door is 1 μm to 10 μm. More preferably, the average particle size is 1 μm or more! It is μm. More preferably, the average particle diameter is λ to Hiroμm.

The particle size distribution of the matting agent particles used in the present invention is as follows:
It can be wide or narrow. However, as mentioned above,
Particle size/! to avoid causing insufficient shading (optical pinhole)! On the other hand, particle size o which is practically ineffective for improving adhesion resistance should be avoided.
, iμm or less. That is,
The preferred particle size distribution is 0. /μm to /jμm.

More preferably 0. j-10 μm. More preferably, the door is 1 μm to 10 μm.

In the protective layer of the present invention, the weight ratio of matting agent particles/hydrophilic colloid is preferably 3 to 01 l. More preferably /, j~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). As the hardening agent, those well known to those skilled in the art can be used, but the amount added is preferably from O.J to 7% by weight based on the total hydrophilic colloid.

The support used in the present invention may be transparent or opaque, but
Preferably, the material does not undergo significant dimensional changes during processing. Examples of such supports include cellulose acetate film, polystyrene film, polyethylene terephthalate film, polycarbonate film, baryta paper, and paper whose surface is made of a water-impermeable polymer such as polyethylene, which are used in ordinary photographic materials. Examples include laminated paper.

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.

A preferred embodiment of the image-receiving layer constituting the image-receiving sheet of the present invention is a substance (referred to as a silver precipitant substance or development nucleus) that catalyzes the reduction reaction of a water-soluble silver complex in the silver salt diffusion transfer method.
A layer containing an alkaline treatment composition in a permeable binder.

Silver precipitant substances include zinc, water droplet, lead, cadmium,
Heavy metals such as iron, chromium, nickel, tin, cobalt, and copper, precious metals such as palladium, platinum, silver, and gold, and sulfides, selenides, and tellurides of these heavy metals,
All conventionally known silver precipitants can be used. 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. This can be seen by making colloidal dispersions of sulfides, metal selenides, or metal tellurides.

To obtain an image-receiving element that gives a favorable tone image, these silver precipitant materials are typically present in a concentration of 10-1 in the receiver (fJ layer).
0 to IQ-5y/crn2, preferably 10-8 to l0
-6y/Crn2 included.

The above-mentioned binders include hydrophilic binders such as gelatin, polyvinyl alcohol, carboxymethyl cellulose, methyl cellulose, etc., but binders made of alkali-impermeable polymers made dialkali-permeable by decomposition are particularly suitable.

Degradable alkali-impermeable polymers include *G,
Cellulose esters such as u-i' cellulose triacetate, cellulose diacetate, cellulose propionate, and cellulose acetate phthalate, and polyvinyl esters such as polyvinyl acetate, polyvinyl propionate-1-, and polyvinyl chloroacetate. and so on. An alkali-impermeable polymer layer made of at least one of these polymers becomes alkali-permeable by decomposition with an alkaline solution. 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 a single layer of an alkali-impermeable polymer permeable to alkali by alkaline decomposition, add an alkali such as sodium hydroxide, potassium hydroxide, lithium hydroxide, or tetraalkylammonium hydroxide and 10 to 100 g of an alcohol such as methanol or ethanol. A saponification solution dissolved in alcohol (aqueous solution) containing a concentration of is prepared, and this saponification solution is brought into contact with a layer of an alkali-impermeable polymer 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 dialkali-impermeable polymer layer is saponified by contact with the saponifying solution.

The saponified layer becomes permeable to alkali and can be penetrated by the diffusion transfer cleaning solution.

To prepare an image-receiving layer for the silver salt diffusion transfer method, a cellulose ester, such as cellulose diacetate, is vapor-deposited, coated with a silver precipitant, coated on a support, and decomposed with an alkali. A method in which a silver precipitant is created on the spot by reacting silver nitrate (for example, with silver nitrate and sulfurized IJ) in a solution, coated on a support, and then subjected to alkali decomposition, and a cellulose ester layer coated on the support in advance. A method in which a silver precipitant is embedded in the decomposed layer at the same time as alkali decomposition of A method of creating a silver precipitant by reacting the silver precipitant with a reducing agent 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 tomethyl vinyl ether, monoethyl ester of a copolymer of maleic anhydride and ethylene, monozorobyl ester of the same copolymer, copolymer of the same monobenzyl ester of the same copolymer, monohexyl ester of the same copolymer, monoethyl ester of the copolymer of tomethyl vinyl ether maleic anhydride, monopropyl ester of the same copolymer, monobenzyl ester of the same copolymer, monobenzyl ester of the same copolymer, Copolymers of monohexyl esters, etc.; polyacrylic acid: polymethacrylic e Copolymers of niacryl acid and methacrylic acid in various ratios; niacrylic acid or methacrylic acid with other vinyl monomers, such as acrylic esters (e.g. butyl acrylate, etc.); ), methacrylic acid esters, vinyl ethers,
Various ratios with acrylamides, methacrylamides, etc., preferably acrylic acid or methacrylic acid content! A copolymer having a molar ratio of 0 to 0 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.

The neutralization timing layer may contain, for example, gelatin, polyvinyl alcohol, polyacrylamide, partially hydrolyzed polyvinyl acetate, a copolymer of β-, droxyethyl methacrylate and ethyl acrylate, or acetyl cellulose as a main component. Used and other U.S. patents 3. ≠jj.

trt issue, J, lA2/, 193, 3,7tz,
rig, same 3. ray, tit issue, same μ.

OORI, No. 030, Tokukai Sho! Those described in Co/4c, IIIj, etc. can also be used. Furthermore, the neutralization timing layer described above may be used, for example, in US Patent U, OJ'4. JP+
C issue, 1/-, 06/, 4c issue, Tokukai Sho! J-7
2. It is also possible to use a single layer of a polymer whose permeation of an alkaline processing liquid is highly temperature dependent, as described in J.Coco No. or Japanese Patent Application Laid-Open No. 7-7T/30.

Additionally, polymerization products of monomers that can undergo β-dissociation 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 portion of the cellulose ester layer containing acetyl cellulose that has not undergone decomposition is suitable for improving the tone, stability, or other photographic properties of the silver transfer image. It may contain seven or more mercapto compounds. Such mercapto compounds are utilized during imbibition by diffusing from the position where they are initially placed. This type of receptor element was developed by Richard W. Young (Richard W.
, Young) US patent! , No. 607,269 and Japanese Patent Application Shojlr-/≠♂ri No. 7.

In addition, if necessary, a hydrophilic property may be formed between the layer of decomposed cellulose ester containing a silver precipitant and the lower layer of cellulose ester or partially decomposed cellulose ester (which may contain the above-mentioned mercapto compound). Another layer of polymer may also be provided. Polymers used in this hydrophilic polymer layer include, for example, gelatin, derivative gelatin (such as phthalated gelatin), sugars (such as starch, galactomannan, gum arabic, hydroxyethylcellulose, methylcellulose, carboxymethylcellulose, pullula/hydroxypropylcellulose, etc.). ), hydrophilic synthetic polymers (eg, polyacrylamide, polymethylacrylamide, poly-N-vinylpyrrolidone, co-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 are provided with a processing liquid between them. Preferably, it is in the form of a photographic film unit disposed with a processing liquid container rupturable at pressures containing .

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 or silver iodobromide.
Silver halide grains with a silver halide composition and an average grain size of 3μ or less.

This is a silver halide photographic emulsion consisting of silver halide grains in which a latent image is mainly formed on the grain surface. Also, as the 9-inder, a hydrophilic colloid such as gelatin is usually used.

The silver halide photographic emulsion is preferably chemically sensitized,
Furthermore, it is spectrally sensitized by methine dyes. Furthermore, compounds such as azole resins 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, a hydroxyamine developer such as N,N-diethyl-hydroxylamine, N,
N-bis-methoxyethyl-hydroxylamine and N
, N-bis-ethoxyethyl-hydroxylamine is preferably used.

A phenidone compound may be used in combination as an auxiliary developer.

Preferably, the processing composition used in the present invention contains a non-silver halogenide solvent, such as U.S. Pat.
, No. 137.27j, same, 137.

Contains the cyclic imides described in No. 27 O (for example, uracil, urazol, !-methyluracil).

The treatment composition usually contains an alkali (e.g. alkali metal hydroxide, e.g. sodium hydroxide, potassium hydroxide) 1
containing polymeric film-forming agents (e.g. hydroxyethylcellulose, sodium carboxymethylcellulose) and further compounds known in silver salt diffusion transfer processes,
For example, antifoggants, color toning agents such as mercapto compounds,
Stabilizers such as oxyethylamino compounds may be included.

(Example) The present invention will be described in further detail below by referring to Examples and Comparative Examples.

Example/Preparation of image-receiving sheet 1. Preparation of image-receiving sheet (1) The following layers were sequentially formed on a polyethylene laminate paper support to prepare an image-receiving sheet (1). The numerical value within 0 indicates the coating amount in y/rn2.

l) Neutralization layer: Cellulose acetate (degree of acetylation! 3%) (j), methyl vinyl ether-maleic anhydride l? 1ffi coalescence (4'), Uvitex OB (product name of Ciba Geigy) (o, o4ri2) Neutralization timing M: Cellulose acetate (degree of acetylation!!%)<r, j), /- (≠
-hexylcarbamoylphenyl)-2,3-dihydroimidazole-1-thio/(0,04) 3) Image-receiving layer: Cellulose acetate (degree of acetylation! 3%) (7,1), sulfide A radical + 7m ( 7,jxlo-'), l-(≠-hexylcarbamoylphenyl)-J.

3-dihydroimidazole-cochthioy (o.

After applying 0λ), apply sodium hydroxide.

Oy was dissolved in methanol JOOOWtl and saponified from the surface using Kuken liquid to form an image receiving layer.

≠) Peeling layer Nibutyl methacrylate-acrylic acid copolymer (molar ratio/Jr:lr (0,0) An image-receiving sheet /-/-/-/λ was prepared by applying a layer as shown.

Preparation of photosensitive sheet Silver halide grains are formed by a single-jet method, physically ripened by a conventional method, desalted, and chemically ripened to form a silver iodobromide emulsion (containing iodide ■t,!,■ t, o mol%) was obtained. The average diameters of the silver halide grains contained in this emulsion were 07.3 microns and 0003 microns. KU■0.6 in this emulsion lKf! Mol and 00.13
It contained moles of silver halide. The emulsions of ■ and ■ were collected in pots with ■/Kp and ■jO, respectively, and 11C! It was dissolved in a constant temperature pass at 0°C.

In addition, the ortho-sensitizing dye 3-(j-chloroco-[coethyl-3-(3-ethyl-cobenzothiazolinylidene)proynyl]-3-bensoxazolio)propane-sulfonate, the panchloro-sensitizing dye (≠-[ :J-((
J-Ethylbenzothiazoline-(2-ylidene)-2-
methyl-7-propenyl]-3-benzothiazolio)butane-sulfonate) and μmhydroxy-t-methyl-
7゜3＠ J a e 1 wt % aqueous solution of 7-chitrazaindene totnl, 1 wt % aqueous solution of 2-hydroxy-4c, 6-cyclotriazine sodium salt ioml
Further, tovtl of a 1% by weight aqueous solution of sodium dodecylbenzenesulfone and 10ynl of a % by weight methanol solution of riboic acid O and I were added and mixed and stirred at 4Io 0c (Completed emulsion ■).

In addition, emulsion ■uoo1p and emulsion ■poop were collected in a pot and dissolved in a constant temperature path of Kzo0c along with the added io% gelatin 1OK4.

In addition, the ortho-sensitizing dye 3-(j-chloro-λ-[coethyl-3-(3-ethyl-benzo+7zolinylidene)pro is nyl]-3-penzoxazolio)propane-sulfonate, nor-Rncro-sensitizing dye (≠−[2−((
J-ethylbenzothiazoline-(koylidene)-2-
Methyl-l-prohaniA/)-J-benzothiazolio)
phthadisulfonate) and ≠-hydroxy-6-methyl-7゜3.3 g, 1% by weight aqueous solution of 7-titrazaindene 1 OIIL 1% 2-hydroxy-≠, 7% by weight aqueous solution of 6-cyclotriazine sodium salt 10- 1 Furthermore, 10 rttl of a 7% by weight aqueous solution of sodium dodecylbenzenesulfonate, and 0.0 rttl of lipoic acid. /wt% methanol solution to
rnl was added and mixed and stirred at 0.degree. C. (finished emulsion ■).

These finished emulsions (1) and (II) were applied to an undercoated titanium dioxide-containing polyethylene terephthalate film base with a silver content of (I)o, zy/m2, and (It)o.
, iy/ln" and dried to obtain a sample. At the same time, polymethyl methacrylate latex (average size J, 1μ) was added to the gelatin aqueous solution and coated so that the dry film thickness was 7 microns. did.

Preparation of processing solution (i) Evaluation of cracks and light fog due to diffusion transfer under low humidity An unexposed photosensitive sheet and an image-receiving sheet were overlapped and left in a constant temperature and humidity room at 0C1/j%RH for 3 hours. Under these conditions, the processing liquid contained in the processing liquid container was squeezed with a developing roller to a thickness of 0.0 cm while applying light of 100001 ux to form a photosensitive sheet and an image receiving sheet. A treatment solution was developed in between. After a0 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, io
A light of 10,000 lux was irradiated for 3Q seconds.

The above processing liquid was squeezed with a developing roller to a thickness of 0.0≠margin, and the processing liquid was spread between the photosensitive sheet and the image receiving sheet. After ≠Q seconds after 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.

Processing is done by j0c! I went with J Chi RH.

Table 2/-/ ○ × ○/ -, 2X
○ ○ /-3× ○ ○ l-≠ × ○ ○/-j
○ ○ ×/−A ○ ×
○/-70× ○ lzu ○ ○ ○ l-ta ○ ○ ○t -
// 0 0 0/ -/2
0 Δ ○○: No Δ: Slightly ×: Yes As shown in Table 2, only the combination of the light-shielding layer and white layer of the present invention shows no cracking at low humidity when there is no contamination from the back layer (no glycerin added). It has become clear that an image receiving sheet without pinholes can be provided.

(Effect of the invention) Silver salt diffusion transfer with a light-shielding layer made of a black pigment/hydrophilic colloid weight ratio in a specific range and a light reflection layer made of a white pigment/hydrophilic colloid weight ratio in 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] 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) a black pigment and a hydrophilic colloid are applied to the side of the support that does not have the image-receiving layer (back side). and (2) a light-shielding layer containing at least spherical particles having a glass transition point (Tg) of 30° C. or lower and having a black pigment/hydrophilic colloid weight ratio of 1.5 to 0.1; (2) a white pigment and a hydrophilic colloid; An image-receiving element for silver salt diffusion transfer method, comprising a light-reflecting layer containing at least a white pigment/hydrophilic colloid weight ratio of 8.5 to 15.