JPH02298944A - Color diffusion transfer photographic film unit - Google Patents

Abstract

PURPOSE:To obtain the film unit having the depth of a transferred color image print and high image quality in combination by incorporating a polymer having a sulfinic acid group between the base and release layer of the image receiving photosensitive sheet of the color diffusion transfer photographic film unit. CONSTITUTION:A cover sheet including a layer having a neutralizing function on a base and an alkaline processing compsn. contg. a light shielding material layer are provided on the image receiving sheet included in the color diffusion transfer photographic film unit and at least a) a dye image receiving layer, b) the release layer and c) at least one silver halide emulsion layer combined with at least one dyestuff image forming material are included successively on the base. The image receiving photosensitive sheet contg. the light shielding material is formed on this silver halide emulsion layer on the side opposite to the alkaline processing soln. and the polymer having the sulfinic acid group is incorporated between the base of this image receiving sheet and the release layer. The film unit having both of the depth of the transferred color image print and high image quality obtd. by such color diffusion transfer photographic film unit is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a color diffusion transfer photographic film unit;
For more details, please refer to the peel-off color diffusion transfer photographic film unit.

(Prior Art) Conventional color diffusion transfer photographic film units are broadly classified into peelable type and peelable type. In the peel-off type, the photosensitive layer and the dye image-receiving layer are coated on separate supports, and after image exposure, the photosensitive element and the dye image-receiving element are overlapped, a processing composition is spread between them, and then the dye image-receiving layer is formed. Stripping off the element yields a dye image transferred to the dye-receiving layer.

The feature of this form is that the dye image formed on the image-receiving layer coated on the support can be directly observed, so there is no deterioration in image quality as seen in the non-peelable type, which will be described later, and the color is excellent. It is to show reproduction. On the other hand, there is the operational inconvenience of overlapping the photosensitive element and the image-receiving element in the camera, and the inconvenience in handling the processed film, in that the alkaline processing solution becomes sticky after peeling and tends to adhere to the surroundings.

In order to solve such problems, Japanese Patent Application Laid-Open No. 63-2266
No. 49, on a white support, at least one silver halide emulsion combined with at least (a) a layer having a neutralizing function, (b) a dye image-receiving layer, (c) a release layer, and (d) a dye image-forming substance. Japanese Patent Application No. 63-120201 further discloses a color diffusion transfer photographic film unit comprising a photosensitive element having successive layers, an alkaline processing composition containing a light-shielding agent, and a transparent cover sheet. a light-sensitive element having sequentially at least (a) a dye-receiving layer, (b) a release layer, and (C) at least one silver halide emulsion layer in combination with a dye-image-forming material; A color diffusion transfer photographic film unit comprising a transparent cover sheet having at least a layer having a neutralizing function on the side on which the processing composition is spread has been described, and in both cases, new types of peelable photographic film units have been proposed. In addition, the support further comprises at least one silver halide emulsion layer combined with a dye image-receiving layer and a dye image-forming substance on the same support, and a release layer between the dye image-receiving layer and the silver halide emulsion layer. U.S. Patent No. 4.529 for a peelable color diffusion transfer photographic film unit having
．． ss No. 3, No. 499.174, No. 4,401,
No. 746, No. 3,730,718, No. 3,227,5
It is stated in No. 50.

(Problems to be Solved by the Invention) In a preferred embodiment of these peelable photographic film units, the dye image-forming substance is a non-diffusible dye-releasing redox compound, and when pyrazolidinones are used as the developer, staining occurs after peeling. Sometimes. The surface p■1 of the peeled surface immediately after peeling is preferably 10 or less, more preferably 8 or less, but of course, if the film unit does not have a neutralizing layer, it may have a neutralizing layer. Even in the case of a film unit in which the film unit is peeled off, the surface pH of the peeled surface may not be completely lowered immediately after peeling. In other words, if the pH is not lowered sufficiently because the peeling is performed a little earlier than the desired peeling time, or if the pH gradually decreases after peeling, but immediately after peeling,
may not have fallen completely yet. In this way, on the surface of the peeled sheet containing the dye image-receiving layer, which was separated from #11 while the pH had not completely decreased,
In some cases, the developer was oxidized in the air, causing pink stains and yellowish brown stains, which significantly impaired image quality.

(Object of the Invention) An object of the present invention is to provide a film unit that combines the thinness of transferred color image prints obtained by #1# type color diffusion transfer photographic film unit and high image quality.

A further object of the present invention is to provide a peelable color diffusion transfer photographic film unit in which the occurrence of staining after peeling is suppressed.

(Means for Solving the Problems) As a result of intensive studies, the present inventor found that A) a cover sheet containing a layer having a neutralizing function on a transparent support;
an alkaline processing composition containing a photoagent, C) on a support at least sequentially a) a dye-receiving layer b) lI! III layer
C) an image-receiving photosensitive sheet comprising at least one silver halide emulsion layer in combination with at least one dye image-forming substance and comprising a light blocking agent on the side of the silver halide emulsion layer opposite the alkaline processing composition; This is achieved by a color diffusion transfer photographic film unit characterized in that the color diffusion transfer photographic film unit contains a polymer having a sulfinic acid group between the support of the image-receiving photosensitive sheet and #J#fli. I found it.

Polymers with sulfinic acid preferably of general formula (f)
It is expressed as

General formula (1) % Formula % R' represents a hydrogen atom or a lower alkyl group having 1 to 6 carbon atoms, such as a methyl group, an ethyl group, an n-butyl group, etc., and a hydrogen atom or a methyl group is preferable. .

L is a divalent linking group having 1 to 20 carbon atoms, such as an alkylene group (e.g., methylene group, ethylene group, trimethylene group, hexamethylene group, etc.), a phenylene group (e.g., 0-phenylene group, p-phenylene group); group, m-phenylene group, etc.), arylene alkylene group (for example, represents an alkylene group having 1 to 12 carbon atoms), -C
O2-1co, R' (However, R3 represents an alkylene group, a phenylene group, or an arylene alkylene group.

), -CONl[-R'- (However, the R3 head represents the same as above.), -CO-N-R'-
(However, R1 and Rff represent those selected from the same group as above.) etc.

etc.

Y represents a sulfinic acid group or a sulfinic acid group forming a salt. The cations forming the sulfinic acid group are 1-
A trivalent one is preferable, and when it is divalent or more, the paired anion may contain other anions in addition to the seven units represented by the general formula (13).

Preferred cations include ammonium ions and metal ions, with alkali metal ions (eg, sodium ions and potassium ions) being particularly preferred.

Preferred specific examples of the monomer unit represented by the general formula (+) are shown below.

The polymer having a repeating unit having a sulfinic acid group according to the present invention may contain, in addition to one unit of the monomer represented by the general formula ([), one unit copolymerized with another ethylenically unsaturated monomer.

Examples of such ethylenically unsaturated monomers include acrylic acid, α-chloroacrylic acid, α-alkyl acrylic acid, such as methacrylic acid, and esters or amides derived from these acrylic acids (such as acrylamide, methacrylic acid, etc.). Amide, n-butylacrylamide, L-butylacrylamide, 2-methoxyethylacrylamide, diacetone acrylamide, methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butylacrylate, t-butylacrylate, 1so-butylacrylate, 2- Ethylhexyl acrylate, n-octyl acrylate, lauryl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, cyclohexyl methacrylate, 2-hydroxyethyl acrylate, 2
-Hydroxyethyl methacrylate, β-alkoxyethyl (methacrylate (e.g. 2-methoxyethyl acrylate, 2-methoxyethyl methacrylate), vinyl ester (e.g. vinyl acetate, vinyl laurate), acrylonitrile, methacrylonitrile,
dienes (e.g. butadiene, isoprene), aromatic vinyl compounds (e.g. styrene, divinylbenzene and its derivatives, e.g. vinyltoluene, vinylacetophenone and sulphostyrene), itaconic acid, citraconic acid, crotonic acid, vinylidene chloride, vinyl alkyl ethers ( Examples include vinyl ethyl ether), N-vinyl-2-pyrrolidone, ethylene, propylene, 1-butene, isobutyne, and the like.

Among these, particularly preferred are acrylamide, N-vinyl-2-pyrrolidone, 2-hydroxyethyl methacrylate, 2-methoxyethyl acrylate, methyl methacrylate, acrylonitrile, and the like.

The ratio of other ethylenically unsaturated monomers other than those represented by the general formula (2) can be changed arbitrarily, but as the ratio of other monomers increases, the effect becomes smaller.
Preferably does not exceed mol%, preferably 50 mol%
It is as follows.

-a The molecular weight of the polymer containing the repeating unit of formula [1] is:
5XIO3~1XLO' is preferred. If the molecular weight is too small, the polymer tends to move easily, and if the molecular weight is too large, coating may be hindered. Particularly preferred is 1X10' to 2x106.

Preferred specific examples of the polymer containing the repeating unit represented by the general formula (■) used in the present invention are shown below.

Note that all composition ratios are molar ratios.

≧　UzNa (6) CH.

02Na (7) CH:
1 pixel x/y = 50/50 x/y = 50150 x/Y = 80/20 The use of polymers having sulfinic acid groups in color diffusion transfer photographic film units was disclosed in Japanese Unexamined Patent Publication No. 1983
-53845, it is disclosed that the storage stability of an alkali-processed composition is improved by incorporating it into an alkali-processed composition, and a method for curing gelatin by using it in combination with a gelatin hardening agent in a photographic light-sensitive material is disclosed. Japanese Patent Application Publication No. 5
6-4141. The former is completely different from the present invention in its addition position and effect, and the latter is for hardening gelatin and is clearly different from the present invention. A preferred embodiment of the present invention in which the gelatin contains the polymer is
Although it is included in the scope of No. 41, the above-mentioned patent does not disclose any structure similar to the present invention, nor any specific effects of the present invention. Therefore, it can be said that the present invention has completely new and unexpected effects.

The effect of the present invention is that the photosensitive layer and the image-receiving layer are coated on separate supports as shown in Japanese Patent Publication No. 49-26896 in a peelable color diffusion transfer photographic film unit.
After image exposure, a photosensitive element and an image-receiving element are overlapped, a processing composition is spread between them, and the image-receiving element is then peeled off to obtain a dye image transferred to the image-receiving layer. A photosensitive layer and an image-receiving layer as shown in 1 are coated on the same support, and after image exposure, a processing composition is spread between the cover sheet and a release layer between the photosensitive layer and the image-receiving layer. through the image receiving layer? It is also recognized in types where images can be directly observed without using a support, but U.S. Pat.
A photosensitive layer and an image-receiving layer as shown in No. 9.683 are coated on the same support, and after image exposure, a processing composition is spread between the cover sheet and the photosensitive layer and the image-receiving layer. On a white support such as a type in which the image is observed by peeling off the image-receiving layer through a peeling layer in between, or as shown in Japanese Patent Application No. 63-120201, at least (a) a dye image-receiving layer, (b) a peeling layer,
(C) at least one in combination with a dye image-forming substance;
A light-sensitive element having two silver halide emulsion layers in sequence, an alkaline processing composition containing a light-blocking agent, and a neutralizing layer on a sheet containing a peeled-off dye-receiving layer, such as the type comprising a transparent cover sheet having a neutralizing function. This is particularly noticeable in the type that does not leave any residue, and in particular, the type described in Japanese Patent Application No. 120201/1983 has a great effect because there is a high possibility that it will be peeled off before the pH has fallen sufficiently.

In the present invention, the position where the polymer represented by formula (1) is added is not particularly limited as long as it is a layer between the support of the image-receiving photosensitive sheet and the peeled layer, but a layer close to the surface after peeling is preferred. However, when a quaternary ammonium salt type polymer is used as a mordant in the image-receiving layer as described later, the quaternary ammonium salt polymer and the sulfinic acid group-containing polymer coagulate, making it difficult to add. Even in such a case, a separate layer may be provided above or below the image-receiving layer to contain a polymer having a sulfinic acid group, if necessary. Of course, they can also be included in other auxiliary layers such as adhesion improving layers, ultraviolet absorbing layers, or protective layers. It can also be distributed and contained in several layers as necessary.

The amount of the sulfinic acid-containing polymer to be contained in the present invention varies depending on the position where the sulfinic acid is contained, the type of polymer, the type of binder used, etc., and cannot be stated unconditionally, but it is 0.1 to 50 mmoj in terms of sulfinic acid units!
/go is preferably 0.5 to 20 mmoj+/n (more preferably 1 to 10 IllOl/d).

In the present invention, the binder used in combination with the polymer having a sulfinic acid group is not particularly limited as long as it is hydrophilic and can be mixed with the polymer in the present invention, and generally gelatin, polyvinyl alcohol, polyacrylamide, polyvinyl Although pyrrolidone and the like are used, gelatin is preferred.

Each of these components will be explained below.

A) r, -, The supports used in the present invention are transparent supports, white supports, black supports, etc. which are usually used as smooth photographic supports. The transparent support has a thickness of 50 to 350 pm,
Preferably, 70-210 pm polyethylene terephthalate, cellulose acetate, polycarbonate, etc. are used. The transparent support may contain a slightly cloudy amount of pigment such as titanium dioxide or a trace amount of dye to prevent light piping.

The preferred white support in the present invention refers to a support in which at least the side on which the dye image-receiving layer is coated is white, and any support can be used as long as it has sufficient whiteness and smoothness. For example, a polymer film whitened by the addition of a white pigment such as titanium oxide, barium sulfate, or zinc oxide with a particle size of 0.1 to 5 μm or by forming microvoids by stretching, for example, a polyethylene terephthalate film formed by two-wheel stretching after completing a conventional method. Films and synthetic paper made of , polystyrene, polypropylene, and paper laminated with titanium white-containing polyethylene, polyethylene terephthalate, polypropylene, etc. on both sides are preferably used.

The thickness of the support is 50-350 μm, preferably 70-2
10 μm, more preferably 80-150.17 m. Further, if necessary, a light-shielding layer can be provided in the support. For example, a support formed by laminating polyethylene containing a light shielding agent such as carbon black on the back side of a white support is used.

The black support contains a light shielding agent such as carbon black and has a thickness of 50 to 350 μm, preferably 70 to 210 μm.
Polyethylene terephthalate, cellulose acetate, polycarbonate, polystyrene, polypropylene, etc., or a paper support with a thickness of 50 to 400 μm, preferably 70 to 250 μm, containing a light shielding agent such as carbon black, is covered with polyethylene, polyethylene terephthalate, polypropylene, etc. A laminated one is preferably used.

Examples of carbon black raw materials include Donnel'
Voet Carbon Black' Mar
cel Dekker + Inc.

Any manufacturing method can be used, such as the channel method, thermal method, and furnace method as described in (1976). The particle size of carbon black is not particularly limited, but is preferably between 90 and 1,800 particles.The amount of black pigment added as a light-shielding agent may be adjusted depending on the sensitivity of the photosensitive material to be exposed to sunlight, but depending on the optical density. About 5 to 10 is desirable.

When using a black support or when the white support is insufficient in whiteness, it is necessary to provide a white light reflecting layer between the support and the dye image receiving layer. White pigments such as titanium oxide, barium sulfate, zinc oxide,
Preferably, a layer containing hollow polymer latex is provided.

In the present invention, it is preferable to use a white support, particularly preferably a polyethylene terephthalate white support containing titanium oxide.

The dye image-receiving layer used in the present invention contains a mordant in a hydrophilic colloid. This may be a single layer or may have a multilayer structure in which mordants having different mordant powers are stacked one on top of the other. Regarding this, JP-A No. 61-2525
51.

As the mordant, a polymer mordant is preferred.

The polymer mordants used in the present invention are polymers containing secondary and tertiary amino groups, polymers having nitrogen-containing heterocyclic moieties, polymers containing these quaternary cation groups, etc., and those having a molecular weight of 5,000 or more are particularly preferable. is 10,00
It is 0 or more.

For example, U.S. Pat. No. 2,548,564, U.S. Pat.
．． No. 430, No. 3,148,061, No. 3.756.
Vinylpyridine polymers and vinylpyridinium cationic polymers disclosed in US Pat. No. 814, etc.; vinylimidaduurium thion polymers disclosed in US Pat. No. 4,124,386, etc.; US Pat. No. 3.
625. No. 694, No. 3,859.096, No. 4.
Polymer mordants capable of crosslinking with gelatin, etc., disclosed in U.S. Pat. No. 128.538 and British Patent No. 1,277.453;
．． No. 852, No. 2,798.063, Japanese Unexamined Patent Publication No. 1983-1
No. 15,228, No. 54-145゜529, No. 52-
No. 126,027, No. 54-155.835, No. 56
Aqueous sol-type mordant disclosed in U.S. Patent No. 17.352, etc.; water-insoluble mordant disclosed in U.S. Patent No. 3,898,088, etc.; U.S. Patent No. 4,168,97
No. 6, U.S. Pat. No. 4,201.840, etc., and reactive mordants capable of forming a covalent bond with the dyes disclosed; furthermore, U.S. Pat. , No. 642,482, No. 3.488,706,
No. 3.557,066, No. 3,271,147, No. 3.271゜148, JP-A-53-30328
No. 52-155528, No. 53-125, No. 5
Examples thereof include mordants disclosed in No. 3-1024, No. 53-107.835, British Patent No. 2.064.802, and the like.

Others: U.S. Patent No. 2,675.316, U.S. Patent No. 2.882
．． Mention may also be made of the mordants described in No. 156.

Among these mordants, those that are difficult to migrate from the mordant layer to other layers are preferred, such as those that crosslink with a matrix such as gelatin, water-insoluble mordants, and aqueous sol (
Alternatively, a latex dispersion type mordant is preferred. Particularly preferred is a latex dispersion mordant, with a particle size of 0.01
-2μ, preferably 0.05-0.2μ.

The amount of mordant applied varies depending on the type of mordant, the content of quaternary cation groups, the type and amount of dye to be mordant, the type of binder used, etc., but is 0.5 to 10 g/1rd, preferably 1.0 to 5. 0 g/rd, particularly preferably 2-4 g/r
It is d.

Hydrophilic colloids used in the image-receiving layer include gelatin,
Polyvinyl alcohol, polyacrylamide, polyvinylpyrrolidone, etc. are used, but gelatin is preferred.

C) Yuuri Hiko In the present invention, the light-shielding layer in the photosensitive element and the light-shielding processing liquid developed on the photosensitive element during processing completely shield the photosensitive layer from external light during the development process. Allows processing under daylight.

Specifically, a layer containing a light blocking agent may be coated on the back side of the support or between the emulsion layer and the support, or a layer containing a light blocking agent may be provided in the support. As the light shielding agent, any material having a light shielding function can be used, but carbon black is preferably used.

The binder for applying the light shielding agent may be any binder as long as it can disperse carbon black, and gelatin is preferred.

D) Peeling Layer In the present invention, a peeling layer is provided between the emulsion layer combined with the dye image-forming material and the dye image-receiving layer, and the emulsion layer is peeled off after processing. Therefore, this release layer must maintain close contact between the image-receiving layer and the emulsion layer in an unprocessed state, and must be easily peelable after processing. Materials for this purpose include, for example, JP-A-47-8237, JP-A-59-22072'? ,
No. 59-229555, No. 49-4653, U.S. Patent 3
220835, 4359518, JP-A-49-433
4, US Pat. No. 56-65133, US Pat. No. 45-24075, US Pat. No. 3,227,550, US Pat.
6, 4366227, etc. can be used. One specific example is a water-soluble (or alkali-soluble) cellulose derivative. For example, hydroxyethylcellulose, cellulose acetate-phthalate, plasticized methylcellulose, ethylcellulose, cellulose nitrate, carboxymethylcellulose, etc., and other examples include various natural polymers such as alginic acid, pectin, gum asibia, etc. Various modified gelatins such as acetylated gelatin and phthalated gelatin can also be used. Further examples include water-soluble synthetic polymers. For example, polyvinyl alcohol, polyacrylate, polymethyl methacrylate, butyl methacrylate, or copolymers thereof.

The release layer may be a single layer or may be composed of a plurality of layers.
-60642 etc.

Further, as an example of a release layer particularly suitable for the present invention, Japanese Patent Application No. 63
-23493, 63-155934, 63-7
No. 6859, No. 63-22526, No. 63-7686
No. 0, No. IF-76861, etc.

In the present invention, a photosensitive layer consisting of a silver halide emulsion layer combined with a dye image-forming substance is provided above the release layer. I will talk about its components below.

ill Dye Image Forming Substance The dye image forming substance used in this invention is either a non-diffusible compound that releases a diffusible dye (which may be a dye precursor) in conjunction with silver development, or it is a non-diffusible compound that releases a diffusible dye (which may also be a dye precursor) in conjunction with silver development, or its own diffusivity is altered. The theory of photographic process ``The T
theory or the Photographic
Process" 4th edition. All of these compounds can be represented by the following general formula (1).

DYE-Y (1) Here, DYE-Y
E represents a dye or its precursor, and Y represents a component that provides a compound with diffusivity different from that of the above compound under alkaline conditions. Depending on the function of Y, compounds can be broadly classified into negative-type compounds that become diffusible in undeveloped areas and positive-tone compounds that become diffusible in undeveloped areas.

Particularly preferred are dye-releasing redox compounds which are themselves non-diffusible, and particularly preferred are negative-working dye-releasing redox compounds which are themselves non-diffusible.

Specific examples of negative-type Y include those that oxidize and cleave as a result of development to release a diffusible dye.

Specific examples of Y are U.S. Pat. Nos. 3,928,312 and 3,9.
No. 93,638, No. 4,076.529, No. 4,15
No. 2,153, 4. 055. No. 428, 4.0
No. 53,312, No. 4,198゜235, No. 4,17
No. 9,291, No. 4,149.892, No. 3,844
, No. 785, No. 3゜443.943, No. 3,751,
No. 406, No. 3.443,939, No. 3.443.9
No. 40, No. 3,628.952, No. 3,980,47
No. 9, No. 4,183.753, No. 4,142,891
No. 4,278,750, No. 4,139°379, No. 4,218. ．． 368, 3,421.964, 4,199', 355, 4゜199.354, 4,135,929, 4.336.322,
No. 4,139,389, Japanese Patent Application Publication No. 53-50736,
No. 51-104343, No. 54-130122, No. 53-110827, No. 56-12642, No. 56
-16131, 57-4043, 57-650
No. 57-20735, No. 53-69033, No. 54-130927, No. 56-164342, No. 5
7-119345 etc.

Among Y of the negative dye-releasing redox compound, a particularly preferred group is an N-substituted sulfamoyl group (the N-substituent is a group derived from an aromatic hydrocarbon ring or a heterocycle). Typical groups for Y are illustrated below, but are not limited to these.

Nf′1. )2- For positive-type compounds, Angewante Hemi International Edition English (Ang
ev, Chea+, In5t, Ed, [ingl,),
22, 191 (1982).

A specific example is one that releases a diffusible dye by self-closing under alkaline conditions, but substantially stops releasing the dye when oxidized during development.

For specific examples of Y having such a function, see U.S. Pat.
-130927, U.S. Patent No. 3,421.964, U.S. Patent No. 4.
199. 355, etc.

Another type is one that does not itself release any pigment, but
Some release dyes when reduced.

This type of compound is used in combination with an electron donor,
The diffusible dye can be released imagewise by reaction with the remaining electron donor imagewise oxidized by silver development. Regarding atomic groups having such functions, for example, U.S. Pat.
18.368, JP 53-110827, U.S. Patent 4
゜278.750, 4,356,249, 4゜35
8.525, JP-A-5.3-110827, JP-A No. 54-1
30927, 56-164342, Public Technical Report 87-6
No. 199, European Patent Publication No. 220746A2, etc.

Specific examples are shown below, but the invention is not limited to these.

H3 C1zHts CH2 When compounds of this type are used, they are preferably used in combination with diffusion-resistant electron donor compounds (known as ED compounds) or their precursors. E
Examples of compounds D include, for example, U.S. Pat. No. 4,263,39
No. 3, No. 4,278°750, JP-A-56-1387
It is described in No. 36, etc.

On the other hand, specific examples of the dye represented by the general formula DYE are described in the following literature.

Example of yellow dye: U.S. Pat. No. 3,597,200, U.S. Pat. No. 3,309°199
No. 4,013,633, No. 4,245.028, No. 4,156,609, No. 4゜139.383,
No. 4,195,992, No. 4,148.641, No. 4,148,643, No. 4,336,322: JP-A-51-114930, No. 56-71072: R
e5earchDisclosure l 7630
(1978) and No. 16475 (1977).

Example of magenta dye: U.S. Pat. No. 3,453,107, 3.544°545
No. 3,932.380, No. 3,931.144, No. 3,932,308, No. 3954.476,
4,233.237, 4,255,509, 4,250,246, 4,142,891, 4
．． 207.104, 4.287.292: JP-A No. 52-106.727, 52-106727, 53-23,628, 55-36,804, 5
No. 6-73,057, No. 56-71060, No. 55-
What is described in No. 134.

Examples of cyan dyes: U.S. Pat. No. 3,482,972, U.S. Pat. No. 3,929°760
No. 4,013,635, No. 4,268.625, No. 4.171,220, No. 4゜242.435,
No. 4,142,891, No. 4,195,994, No. 4,147.544, No. 4,148,642: British Patent No. 1,551°138; No. 52-8827, No. 53-47823, No. 53
- ■No. 43323, No. 54-99431, No. 56-7
No. 1061; European Patent (RPC) No. 53゜037, No. 53, 040; Re5earch Dis
Closure No. 17.630 (1978) and Closure No. 16,475 (1977).

121 Silver Halide Emulsion The silver halide emulsion used in the present invention may be a negative emulsion that mainly forms a latent image on the surface of silver halide grains, or
It may be an internal latent image type direct positive emulsion that forms a latent image inside the silver halide grains.

Internal latent image type direct positive emulsions include, for example, so-called conversion type J emulsions that take advantage of the difference in solubility of silver halides, doped metal ions, chemical sensitization, or other emulsions. "Core/shell type" in which at least the photosensitive site of a silver halide inner core particle coated with both is coated with a silver halide outer shell.
There are emulsions, etc., which are described in US Pat. No. 2,592.
250, No. 3,206,313, British Patent I.

027.146: U.S. Patent No. 3,761,276;
935,014, 3,447,927, 2,497
,875, 2,563,785, 3,551,66
2, 4,395,478, West German patent 2,728.10
B, as described in US Pat. No. 4,431,730.

Further, when using an internal latent image type direct positive emulsion, it is necessary to provide fog nuclei on the surface by using light after image exposure or by using a nucleating agent.

As a nucleating agent for this purpose, U.S. Patent No. 2,563.78
5, hydrazines described in 2.588,982,
Hydrazides and hydrazones described in U.S. Patent No. 3,227,552, British Patent No. 1.283,835, JP-A-52-69613, U.S. Patent No. 3,615,615, No. 3
,719.494, 3,734,738, 4.09
Heterocyclic quaternary salt compounds described in US Pat. No. 4,683, US Pat. U.S. Patent No. 4,030,925, U.S. Patent No. 4,031,1
27, 4,245,037, 4,255,511,
Thiourea-bonded acylhydrazine compounds described in 4,266.013, 4,276.364, British Patent 2,012.443, etc., and US Patent 4,080,2
70, 4.278.748, British Patent 2. Oll
For example, acylhydrazine compounds having a thioamide ring or a heterocyclic group such as triazole or tetrazole bonded as an adsorption group as described in , 391B, etc. are used.

In the present invention, a spectral sensitizing dye is used in combination with these negative emulsions and internal latent image type direct positive emulsions.

For specific examples, see JP-A-59-180550,
No. 60-140335, Research Disclosure (RD) 17029, U.S. Patent No. 1°846.300, No. 2,078,233, No. 2°089.129, No. 2,1
65,338, 2゜231.658, 2,917,
516, 3゜352.857, 3,411,916
, 2°295.276, 2,481,698, 2
゜688.545, 2,921,067, 3゜28
2.933, 3,397,060. 3゜660.1
03, 3,335,010. 3゜352.680.
3,384,486, 3゜623.881, 3,
718,470, 4°025.349, etc.

(3) Structure of the photosensitive layer In order to reproduce natural colors by the subtractive color method, the above-mentioned dye image-forming substance provides a dye having selective spectral absorption in the same wavelength range as the emulsion spectrally sensitized with the above-mentioned spectral sensitizing dye. A photosensitive layer consisting of at least two in combination with a photosensitive layer is used. The emulsion and the dye image-forming substance may be coated as separate layers, or
Alternatively, they may be mixed and applied as a single layer. A separate layer is preferable when the dye image-forming material coated has absorption in the spectral sensitivity range of the emulsion with which it is combined.

Further, the emulsion layer may be composed of a plurality of emulsion layers having different sensitivities, and an arbitrary layer may be provided between the emulsion layer and the dye image forming material layer. For example, JP-A-60-17354
A layer containing the nucleating development accelerator described in 1, Japanese Patent Publication No. 1983-
It is also possible to increase the color image density by providing a barrier layer as described in JP-A No. 15267, and to increase the sensitivity of the photosensitive element by providing a reflective layer as described in JP-A No. 60-91354.

In a preferred multilayer structure, a blue-sensitive emulsion combination unit, a green-sensitive emulsion combination unit, and a red-sensitive emulsion combination unit are arranged in this order from the exposure side.

Any layer may be provided between each emulsion layer unit, if necessary. In particular, in order to prevent the effects of development of one emulsion layer from having an unfavorable influence on other emulsion layer units, it is preferable to provide an intermediate layer.

When a developer is used in combination with a non-diffusible dye image-forming material, the intermediate layer preferably contains a non-diffusible reducing agent to prevent diffusion of the oxidized product. Specifically, non-diffusible hydroquinone, sulfonamide phenol,
Examples include sulfonamide naphthol, and more specifically, JP-B No. 50-21249, No. 50-23813, JP-A No. 49-Sho. 106329, 49-129535, US Patent 2,336,327, 2,360,290, 2,403,721, 2,544,640, 2,7
32,300, 2,782,659, 2,937,
086, 3,637,393, 3,700,453
, British Patent No. 557,750, Japanese Patent Application Publication No. 57-24941,
58-21249, etc. Moreover, regarding those dispersion methods, JP-A No. 60-238831, Japanese Patent Publication No. 60-238831
0-18978.

In the present invention, an irradiation prevention layer, an isolation layer, a protective layer, etc. are applied as necessary.

The processing composition used in the present invention is spread uniformly on the photosensitive element after exposure of the photosensitive element, and is placed on the back side of the support or on the side of the photosensitive layer opposite to the processing solution. It pairs with the light-shielding layer to completely shield the photosensitive layer from external light, and at the same time develops the photosensitive layer using the components it contains. For this purpose, the composition contains an alkali, a thickener, a light shielding agent, a developer, a development accelerator and a development inhibitor to control development, and an antioxidant to prevent deterioration of the developer. Contains. A sunscreen is always included in the composition.

The alkali is sufficient to adjust the pH of the liquid to 12 to 14, and alkali metal hydroxides (e.g., sodium hydroxide, potassium hydroxide, thiram hydroxide), alkali metal phosphates (e.g., phosphoric acid Among them, potassium hydroxide and sodium hydroxide are preferred.

Thickeners are used to spread the processing solution uniformly, and when peeling off the used photosensitive layer together with the cover sheet, the thickening agent
/ Necessary to maintain close contact between cover sheets. For example, alkali metal salts of polyvinyl alcohol, hydroxyethylcellulose, and carboxymethylcellulose are used, preferably hydroxyethylcellulose,
Sodium carboxymethyl cellulose is used.

As a light shielding agent, any dye or pigment, or a combination thereof, can be used as long as it does not diffuse into the dye image-receiving layer and cause staining.Carbon black is a typical example, but titanium A combination of white and dye is also used. This dye may be a temporary light blocking dye that becomes colorless after a certain period of time of treatment.

Preferred developing agents include any that cross-oxidizes the dye image-forming material and is substantially resistant to staining when oxidized. Such developers may be used alone or in combination of two or more, or may be used in the form of a precursor. These developing agents may be included in appropriate layers of the photosensitive element or may be included in the alkaline processing solution. Specific compounds include aminophenols and pyrazolidinones, and among these, pyrazolidinones are particularly preferred.

For example l-phenyl-3-pyrazolidinone, t-p-
Tolyl-4,4-dihydroxymethyl-3-pyrazolidinone, 1-(3'-methyl-phenyl)-4-methyl-
Examples thereof include 4-hydroxymethyl-3-pyrazolidinone, 1-phenyl-4-methyl-4-hydroxymethyl-3-pyrazolidinone, and 1-p-tolyl-4-methyl-4-hydroxymethyl-3-pyrazolidinone.

After processing, the cover sheet is peeled off and disposed of together with the processing solution and used photosensitive layer.

However, the cover sheet has the function of uniformly spreading the processing solution on the photosensitive element and neutralizing the alkali introduced from the processing composition.

It is also possible to adjust the sensitivity of the photosensitive layer by incorporating a filter dye into the cover sheet. The filter dye may be added directly into the support of the cover sheet or may be applied as a separate layer.

G) Cover Sheet The support used in the cover sheet of the present invention is a smooth, transparent support commonly used as a photographic support. Preferably thickness 50-350 μm, preferably 50-2
10 μm polyethylene terephthalate, cellulose acetate, polystyrene, polycarbonate, etc. are used. In order to prevent light piping, the transparent support preferably contains a trace amount of a dye or a slight amount of a pigment such as titanium dioxide. The transparent support is preferably provided with an undercoat layer.

The layer having a neutralization function used in the present invention is a layer containing an acidic substance in an amount sufficient to neutralize the alkali brought in from the treatment composition, and if necessary, the neutralization rate can be adjusted. It may also have a multilayer structure consisting of layers such as a timing layer, an adhesion reinforcing layer, and the like. Preferred acidic substances include substances containing an acidic group with a pKa of 9 or less (or a precursor group that provides such an acidic group upon hydrolysis), and more preferably olein as described in U.S. Pat. No. 2,983,606. Higher fatty acids like acids, U.S. Patent 3,362.81
Polymers of acrylic acid, methacrylic acid or maleic acid and their partial esters or acid anhydrides as disclosed in No. 9; acrylic acid and acrylic acid as disclosed in French Painting Patent No. 2°290.699 Ester communicator; U.S. Patent No. 4,139.383 and Research Disclosure
Mention may be made of acidic polymers of the latex type, such as those disclosed in J. M. 16102 (1977).

In addition, U.S. Patent No. 4,088,493, Japanese Patent Application Laid-open No. 1987-
No. 153,739, No. 53-1.023, No. 53-4
, No. 540, No. 53-4, 541, No. 53-4, 54
Acidic substances disclosed in No. 2 and the like can also be mentioned.

Specific examples of acidic polymers include ethylene, vinyl acetate,
These include copolymers of vinyl monomers such as vinyl methyl ether and maleic anhydride and their n-butyl esters, copolymers of butyl acrylate and acrylic acid, cellulose acetate hydrogen slate, and the like.

The polymeric acid can be used alone or in combination with a hydrophilic polymer. Examples of such polymers include polyacrylamide, polymethylpyrrolidone, polyvinyl alcohol (including partially saponified products), carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, polymethyl vinyl ether, and the like. Among these, polyvinyl alcohol is preferred.

Furthermore, a polymer other than a hydrophilic polymer, such as cellulose acetate, may be mixed with the polymeric acid.

The amount of polymeric acid applied is controlled by the amount of alkali developed on the photosensitive element. The equivalent ratio of polymeric acid to alkali per unit area is preferably 0.9-2.0. If the amount of polymeric acid is too small, the hue of the transferred dye may change or staining may occur in the white background, and if it is too large, problems such as a change in hue or a decrease in light resistance may occur. A more preferable equivalent ratio is 1. It is O-1,3. When mixed with a hydrophilic polymer, too much or too little amount of the hydrophilic polymer will deteriorate the quality of the photograph. The weight ratio of hydrophilic polymer to polymeric acid is 0.110, preferably 0.3-3.0.

Additives can be incorporated into the neutralizing layer of the present invention for various purposes. For example, hardening agents known to those skilled in the art can be added to harden this layer, and polyhydric hydroxyl compounds such as polyethylene glycol, polypropylene glycol, glycerin, etc. can be added to improve the brittleness of the film. Other antioxidants, as necessary.
Development inhibitors and their precursors can also be added.

The timing layer used in combination with the neutralization layer may be a polymer that reduces alkali permeability, such as gelatin, polyvinyl alcohol, partially acetalized polyvinyl alcohol, cellulose acetate, partially hydrolyzed polyvinyl acetate, etc.; Latex polymers that are made by copolymerizing a small amount of hydrophilic comonomers such as acrylic acid monomers and have a high activation energy for alkali permeation; polymers containing lactone rings are useful.

Among them, Japanese Patent Application Publication No. 54-136328, U.S. Patent No. 4,
No. 267.262, 4. 009. No. 030, 4
Timing layer using cellulose acetate disclosed in JP-A No. 54-128335, JP-A No. 56-69,629, JP-A No. 57-6.843, U.S. Pat. No. 4,056°394. No. 4,061,496, No. 4,199.362, No. 4,250,243,
A latex polymer made by copolymerizing a small amount of a hydrophilic comonomer such as acrylic acid, as disclosed in U.S. Pat. No. 4,229,516, etc.; Polymers having disclosed lactone rings; Others JP-A No. 56-25735, No. 5
No. 6-97346, No. 57-6842, European Patent (El) No. 31゜957A1, No. 37,724A1
Particularly useful are the polymers disclosed in US Pat.

In addition, those described in the following documents can also be used.

U.S. Patent No. 3,421,893, 3.455°686
No. 3,575,701, No. 3,778.265, No. 3,785,815, No. 3゜847.615,
4,088,493, 4,123,275, 4,148,653, 4,201,587, 4
, No. 288.523, No. 4,297,431, West German Patent No. 111 (OLS) No. 1,622,936, No. 2.
162. No. 277, Re5earch Disclo
sure 15, l 62 Il & 1151
(1976).

As a neutralization timing layer that takes an inverted S-shaped pH decreasing process, an ethylenically unsaturated monomer that can be copolymerized with an ethylenically unsaturated monocarboxylic acid or dicarboxylic acid (for example, acrylic acid, methacrylic acid, itaconic acid) is used. Hffl
'JJf or higher combination copolymer, JP-A-5
Nos. 9-202463 and 4,297.431;
No. 23, No. 4゜201.587, No. 4,229,51
No. 6, JP-A-55-121438, JP-A No. 56-1662
No. 12, No. 55-41490, No. 55-543-41
No. 56-102852, No. 57-141644, No. 57-173834, No. 57-179841,
West German Patent Application Publication (OLS) No. 2゜910.271, European Patent Application Publication aP31957A I, Re5earc
Examples include those described in H Disc Iosure Nhl 8452 and the like. Examples of ethylenically unsaturated monomers include ethylene, propylene, l-butene, isobutyne, styrene, chloromethylstyrene, hydroxymethylstyrene, vinylhenzenesulfonic acid sorta, vinylbenzylsulfonic acid sodium, N, N, N-
Trimethyl-N-vinylhensyl ammonium chloride, N,N-dimethyl-N-benzyl-N-vinylhensyl ammonium chloride, α-methylstyrene, vinyltoluene, 4-vinylpyridine, 2-vinylpyridine, hensylvinylpyridinium Chloride, N-vinylacetamide, N-vinylpyrrolidone, 1-vinyl-
2-Methylimidazole, monoethylenically unsaturated esters of aliphatic acids (e.g. vinyl acetate, allyl acetate), maleic anhydride, esters of ethylenically unsaturated monocarboxylic or dicarboxylic acids (e.g. n-butyl acrylate, n- Hexyl acrylate, hydroxyethyl acrylate, cyanoethyl acrylate, N,N-diethylaminoethyl acrylate, methyl methacrylate, n-butyl methacrylate, benzyl methacrylate, hydroxyethyl methacrylate, chloroethyl meccrylate, methoxyethyl methacrylate, N,N~
diethylaminoethyl methacrylate, N,N,N-triethyl-N-methacryloyloxyethylammonium p-)luenesulfoner), N,N-diethyl-
N-methyl-N-methacryloyloxyethylammonium p-)luenesulfonate, dimethyl itaconate,
maleic acid monobenzyl ester), amides of ethylenically unsaturated monocarboxylic or dicarboxylic acids (e.g. acrylamide, N,N, -dimethylacrylamide, N-methylolacrylamide, N-(N,N-
dimethylaminopropyl) acrylamide, N.

N,N-)limethyl-N-(N-acryloylpropyl)ammonium-p-)luenesulfonate, sodium 2-acrylamido-2-methylpropanesulfonate, acryloylmorpholine, methacrylamide, N,N-dimethyl-N'- Examples include acryloylpropanediamine propionate betaine, N1N-dimethyl=N'-methacryloylpropanediamine acetate betaine), and the like.

The neutralization timing layer may be a single layer or multiple layers.

In addition, timing layers made of these materials are covered by, for example, U.S. Patent No. 4,009,029, West German Patent Application (OLS)
．． No. 913.164, 3. Development inhibitors and/or precursors thereof disclosed in JP-A No. 4.672, JP-A No. 54-155837, JP-A No. 55-138745, etc., and - U.S. Pat. No. 4,201,57
It is also possible to incorporate the hydroquinone precursor disclosed in No. 8, other additives useful for photography, or their precursors.

The film unit of the present invention is disclosed in Japanese Patent Publication No. 48-33697,
JP-A No. 48-43317, No. 50-153628, No. 5
2-11027 and 56-48629, it is processed into a monosheet using a masking agent, a rail material, a surplus liquid trapping material, etc.

In particular, in order to make it easier to peel off after treatment, research and
Research Disclosure
It is effective to insert a slit as described in 23026 (1983). The shape, depth, etc. of the slit are selected depending on the physical properties of the support used.

(Example) Example-1 Passive Order 22'' - Titanium White The following (A), (B), and (C) layers were placed on the back side of a PET support containing a white pigment, and the following (1) was placed on the opposite side. ~
(22) A layer was applied to prepare an image-receiving photosensitive zone I.

(A) A light shielding layer containing 2.0 g/nf of carbon black and 2.0 g/nf of gelatin.

(B) Titanium white 2.0g/rr! and a white layer containing 0.1 g/cd of gelatin.

(C) Polymethyl methacrylate spherical matting agent 0゜0
9 g/n (and a protective layer containing 0.3 g/nl of gelatin.

(Mordant layer containing 3 g/cd of polymer latex mordant and 3 g/n of gelatin (11) below.

(2) A first release layer consisting of 0.1 g/m of the following compound.

CH.

■ -(C1I□C)I)-χ-(CH2C) y
x/Y=75/25COOHC00C+l1)l
zz (3) Cellulose acetate with a degree of acetylation of 51% 0.2 g/
, f.

(4) Ig/ethyl acrylate latex
layer containing 2.5 g/n of gelatin.

(5) The following cyan dye-releasing redox compound 0°44
g/n(, tricyclohexyl phosphate 0.
09g/nf, 2.5-di-L-pentadecylhydroquinone 0.008g/nf, carbon black 0.05g
/r+? , and a layer containing 0.8 g/m of gelatin.

E( (6) Titanium oxide 2g/rr+ and gelatin 0.5g
A light reflecting layer containing /M.

(7) Octahedral internal latent image type direct positive silver bromide emulsion with a grain size of 1.0 μm (silver amount: 0.15 g/rd), the following red-sensitive sensitizing dye, gelatin 0.4 g/nf, the following composition: Nucleating agent (
NA>1.1μg/a? and 2-sulfo-5-n-pentadecylhydroquinone sodium salt 0.02g/
A low-speed red-sensitive emulsion layer containing rd.

NA (8) Grain size 1.6 μm octahedral internal latent image type direct positive silver bromide emulsion (silver amount o, 5 g 10 f) Red-sensitive sensitizing dye shown below, same as gelatin 0.8 g/m layer (7) Nucleating agent (
NA) 3.0 μg/m and 2-sulfo-5-n-pentadecylhydroquinone sodium salt 0.04 g/%
High sensitivity red-sensitive emulsion layer containing.

Red-sensitive sensitizing dye Cx lla Cz HaS Os
S (hll ・C5H5N per 1g 1.4■ +912.5-G-Pentadecylhydroquinone 1
．． 2g/m, polymethyl methacrylate 1°2g/n
(And a color mixing prevention layer containing gelatin 0.1g1rd.

θω A layer containing 0.3 g/n of gelatin.

αυ The following magenta dye-releasing redox compound 0゜1
5g/rrr, ) Licyclohexyl phosphate 0
．． 1 g/n (and 0.009 g/n of 2,5-di-t-pentadecylhydroquinone (and 0.9 g/n of gelatin)
(Containing layer.

@ Titanium oxide l g/rrl and gelatin 0.25
A light reflective layer containing g/rd.

αco Octahedral internal latent image type direct positive silver bromide emulsion with a grain size of 1.0 μm (silver amount 0.12 g/n ()) Green-sensitive sensitizing dye shown below, gelatin 0.25 g/m, layer (7 ) Same nucleating agent (NA> 1.1 μg/cd and 2-sulfo-
A low-sensitivity green-sensitive emulsion layer containing 0.02 g/n of 5-n-pentadecylhydroquinone sulfur salt.

0 phrases Octahedral internal latent image type direct positive silver bromide emulsion with a grain size of 1.6 μm (silver amount 0.35 g/rrr) The following blue-sensitive sensitizing dye, gelatin 0.7 g/11 (, layer (7 ) High-sensitivity green-sensitive emulsion layer containing 1.7 μg/rd of the same nucleating agent (NA) and 0.04 g/m of 2-sulfo-5-n-pentadecylhydroquinone sodium salt.

and 1■ θ92,5-di-t-pentadecylhydroquinone per gram of silver 0.
8g/n (, polymethyl methacrylate 0.8g/n
? and gelatin 0.45g10 (color mixing prevention layer).

Layer containing 0 [9 gelatin o, 3 g/rtt.

Yellow dye-releasing redox compound with the following structure (
0,53 g/n (), tricyclohexyl phosphate (0,13 g/nr), 2,5-di-pentadecylhydroquinone (0,014 g/rr+) and gelatin (0,7 g/n?). .

Ql Titanium oxide 0.7g/rrl and gelatin 0
゜Light reflective layer containing 18g/rrr.

(2) Octahedral internal latent image type direct positive silver bromide emulsion with a grain size of 1.1 μm (silver amount: 0.25 g 10f), the following blue-sensitive sensitizing dye, gelatin o, 4 g/=, layer (7) and Same nucleating agent (NA) 2 μg/rr+, and 2-sulfo-
5-n-pentadecylhydroquinone sodium salt 0
．． 045g/n? A low-frequency blue-translucent emulsion layer containing

(To) Octahedral internal layer image type direct positive silver bromide emulsion with a grain size of 1.7 μm (silver amount 0.42 g/rrr) The following blue-sensitive sensitizing dye, gelatin 0. 45g/rd, layer (7)
A high-speed blue-sensitive emulsion layer containing 3.3 μg/i of the same nucleating agent (NA) and 0.025 g/i of 2-sulfo-5-n-pentadecylhydroquinone sodium salt.

Blue-sensitive sensitizing dye (C1b) *5Oall-N[! h per 8 tg 0.4■ (Cl1l) 4SO3(CH□), -3O□11
・0.8■ per 1g of NEh8 (21) 4x10 each of the following ultraviolet absorbers
-'mol/d, and an ultraviolet absorbing layer containing 0.5 g/rr+ of gelatin.

j (22) Matting agent and gelatin 1. A protective layer containing Og/rd.

5 Mysterious S Arms Plan: Nito ■~IV An image-receiving photosensitive sheet that is completely the same as image-receiving photosensitive sheet I except that the following layer was provided under [il+ (support side) of image-receiving photosensitive sheet 1]~ An IV was prepared.

Image-receiving photosensitive sheet: layer containing 1.5 g/rd of gelatin ■: layer containing 1.5 g/+d of gelatin and 0.56 g/n of polystyrene sulfinic acid (layer containing 1.5 g/rrf of gelatin and polystyrene sulfinic acid) 0.93 g/n (contains layer texture) Sheet V~■ Image-receiving photosensitive sorting that is exactly the same as image-receiving photosensitive sheet I except that the following layer is coated between layer +11 and layer (2) of the image-receiving photosensitive sheet. V~■ were produced.

Image-receiving photosensitive sheet ■: Layer containing gelatin 0.5 g/- ■: Layer containing gelatin 0.5 g/rd and polystyrene sulfin acid hydrium 0.38 g/n (containing layer) ■: Gelatin 0.5 g 1 rd and polystyrene sulfin acid hydrium 0.56 g/n (layer containing) ■: Gelatin 0.5 g/n (and exemplified compound (
A layer containing 0.51 g/d of 8).

Cover sheet ■ As a cover sheet, the following layer [11 (2+) was coated on a polyethylene terephthalate transparent support containing a dye for preventing light piping and undercoated with gelatin.

(1) Acrylic acid-butyl acrylate (molar ratio 8:2) copolymer with an average molecular weight of 50,000 at 10.4 g/M and l,4-bis(2,3-epoxypropoxy)-butane O, 1 g/rd. A neutralizing layer containing.

(2) 2.9 g/m of the following polymer, poly(methyl vinyl ether-comonomethyl maleate) 0°2
Neutralization timing layer containing 9g/rrr.

CH, CI-1.

1 + cHz C ÷ completed "--→Cl (t C juice v-1" C
Hz CII)rrl 1
1COOCH3C00CJ4011C
The 0OH image-receiving photosensitive sheet was exposed to light through a color test chart, overlapped with the cover sheet (■), and the following processing solution was spread between both sheets to a thickness of 75 μm (spreading was done with the help of a pressure roller). went) did.

The treatment was carried out at 25° C. and peeled off at 2 minutes 30 seconds and 10 minutes after treatment.

Peeling occurred at the release layer in the photosensitive sheet, and a color image could be directly observed.

Samples peeled at each peeling time were heated to 25°C after peeling.
After being left for 2 hours under the condition of 70% RH, it was measured using a TCD density meter manufactured by Fuji Photo Film H. The maximum and minimum transfer densities are summarized in one table.

B, G, and R are transfer densities measured using blue, green, and red filters, respectively.

As shown in Table 1, by including the polymer of the present invention, the maximum transfer density does not decrease significantly, and
It significantly and effectively suppresses the appearance of staining (represented by the lowest density in the G filter) when the peeled print gradually develops a pink color when peeled off in a relatively short period of time.
It can be seen that a reflective print of excellent image quality is provided.

Claims (1)

[Claims] A) a cover sheet comprising at least a layer having a neutralizing function on a transparent support, B) an alkaline treatment composition containing a light-shielding agent, C) a) dye image-receiving layer b) at least sequentially on the support.
a) release layer c) at least one silver halide emulsion layer in combination with at least one dye image-forming substance;
and a color diffusion transfer photographic film unit comprising an image-receiving photosensitive sheet containing a light-blocking agent on the opposite side of the silver halide emulsion layer from the alkali processing composition, wherein a sulfinic acid is present between the support of the image-receiving photosensitive sheet and the release layer. A color diffusion transfer photographic film unit characterized in that it contains a polymer having a group.