JPS6360378B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to photographic elements for color diffusion transfer, and more particularly to photographic elements for color diffusion transfer containing specific organic fluorescent brighteners to obtain color diffusion transfer images with improved whiteness without reducing the maximum density of the dye image. The present invention relates to photographic elements suitable for color diffusion transfer. A method using an organic fluorescent whitening agent is known as a method for improving the white background of ordinary color photographic paper based on a conventional color development method. The brighteners used here fluoresce under irradiation with ultraviolet light and enhance the whiteness of the white background of photographic paper by emitting visible light, usually pale blue. However, unlike general color photographic paper, photographic elements for color diffusion transfer have a special feature in that the dye diffuses to the image-receiving layer and forms a dye image in the image-receiving layer. When an organic fluorescent brightener used in paper is used in the image-receiving layer of a photographic element for color diffusion transfer,
It has been unexpectedly discovered that most organic fluorescent brighteners reduce the density of the color image formed in the image-receiving layer. We believe that this phenomenon is based on the above-mentioned special characteristics of photographic elements for color diffusion transfer, and that the organic fluorescent whitening agent that lowers the density of the color image is caused by the staining of the dyes that diffuse on the image-receiving layer. We speculated that this was due to the type of organic fluorescent brightener used, and completed further intensive research to complete the present invention. Accordingly, it is an object of the present invention to provide a photographic element for color diffusion transfer that has improved whiteness without reducing the density of the dye image. The object of the present invention and other objects of the present invention described below are to provide a photographic element for color diffusion transfer having an image-receiving layer, in which the image-receiving layer contains an organic fluorescent brightener represented by the following general formula. This is achieved by General formula [] (In the formula, X ₁ and X ₂ represent a methyl group, 2-hydroxyethyl group, or 2-hydroxypropyl group, and furthermore, X ₁ and X ₂ may jointly form a morpholine ring with a nitrogen atom, Y ₁ and Y ₂ consist of a hydrogen atom (however, both Y ₁ and Y ₂ are not hydrogen atoms), a methyl group, a 2-hydroxyethyl group, a 2-hydroxypropyl group, a 2-sulfoethyl group, or a salt thereof. represents the group,
Furthermore, Y ₁ and Y ₂ may jointly form a morpholine ring together with a nitrogen atom, and Z is a halogen atom or a group -O-A (A represents an alkyl having 1 to 4 carbon atoms) M represents a hydrogen atom, a potassium atom or a sodium atom. Examples of the halogen atom represented by Z in the general formula of the claims include a fluorine atom, a bromine atom, an iodine atom, and a chlorine atom, and a preferred halogen atom is a chlorine atom. Also, the group -O-A
Alkyl A may be straight chain or branched, for example methyl, ethyl, n-propyl, isopropyl, n-
Mention may be made of butyl, isobutyl, sec-butyl, and t-butyl, with methyl, ethyl, and t-butyl being preferred, and methyl being particularly preferred. Further, the alkyl may have a substituent (for example, a hydroxyl group), such as 2-hydroxyethyl. Preferred as M is a sodium atom.
Also, preferred as the group consisting of a salt of 2-sulfoethyl group represented by Y ₁ or Y ₂ is the group -
_{CH2CH2SO3Na , the} group _-CH2CH2SO3K , and _{the group -CH2CH2SO3Na is} particularly _preferred . Specific examples of the organic fluorescent brightener of the present invention are listed below, but the present invention is not limited to these compounds. Although any method may be used to incorporate the organic fluorescent brightener according to the present invention (hereinafter referred to as the compound of the present invention) into the image-receiving layer, the following method is preferable. That is, the compound of the present invention may be dissolved in an aqueous gelatin solution and mixed with a latex mordant solution and applied, or the compound of the present invention may be included in a latex mordant solution in advance and added to the aqueous gelatin solution. good. Alternatively, the compound of the present invention may be added to a mixed aqueous solution of gelatin and latex mordant. The compound of the present invention can be added directly to a coating solution without using an organic solvent or polymer, thereby eliminating vertical scratches, reticulation, and foreign matter precipitation that occur when coating with an organic solvent or polymer. It is possible to eliminate such obstacles. The compound of the present invention is contained in the image-receiving layer 100 cm ² of the image-receiving layer.
It is contained in the range of 0.05 to 5 mg per image-receiving layer, especially in the image-receiving layer.
A range of 0.13 mg per 100 cm ² is preferred. The image-receiving layer containing the compound of the present invention is permeable to alkali and preferably contains a dye mordant that mordants various color image-forming substances. As this dye mordant, U.S. Patent No. 3148061, Japanese Patent Application
Nonionic dye mordants such as poly-4-vinylpyridine described in the specification of -32100,
Patent application No. 52-127794, No. 54-50501, No. 53-
Specification No. 96462, U.S. Patent No. 3709690, Japanese Unexamined Patent Publication No. 1983-
Although the cationic dye mordants described in Publication No. 129034 and Belgian Patent No. 820394 may be used, the latter cationic dye mordant is preferred. Further, the image-receiving layer is preferably formed by coating a latex mordant liquid. In the present invention, a particularly preferred image-receiving layer is an image-receiving layer coated with a latex mordant liquid of a polymer represented by the following general formula []. General formula [] [In the formula, A is a unit of a copolymerizable monomer having at least two ethylenically unsaturated groups (e.g. divinylbenzene), B is a unit of a copolymerizable α,β-ethylenically unsaturated monomer (e.g. styrene, methyl methacrylate), R ₁ is a hydrogen atom or a methyl group, R ₂ and R ₃ are each a lower alkyl group (preferably a lower alkyl group having 1 to 4 carbon atoms), and R ₄ is an alkyl group (preferably a lower alkyl group having 1 to 4 carbon atoms). is an alkyl group having 1 to 12 carbon atoms, and this alkyl group may further have a substituent, such as an aryl group such as a phenyl group, p-nitrophenyl group, p-chlorophenyl group, cyclohexyl group, etc. or a cycloalkyl group (e.g. a C5-C6 cycloalkyl group such as a cyclopentyl group), X represents an anion, and n is an integer of 1 or 2; , x is 0.5 to 6.0 mol percent, y is 0 to 79.5 mol percent, z is
20 to 99.5 mole percent. Furthermore, the image-receiving layer may contain an ultraviolet absorbing substance in order to prevent the mordanted dye image from fading due to ultraviolet light, and may also contain a dye stabilizer. The compound of the present invention can be synthesized, for example, with reference to the following patents. Special Publication No. 18540, Showa 47-18540,
No. 46-14901, No. 46-14902, No. 46-3271,
46-3272, 45-773, 45-20983, 45-20983, 45-773, 45-20983,
No. 46-38422, No. 46-38423, No. 48-32410,
JP-A-48-28030, JP-A No. 48-42022, JP-A No. 48-
Publications No. 20817. The image-receiving layer according to the present invention as described above comprises diffusible dyes or diffusers formed as a function of exposure as a result of exposure and subsequent treatment of a light-sensitive silver halide emulsion layer in combination with a color image-forming substance with an alkaline processing composition. Used to mordant color pigment precursors. The color image forming materials used in the present invention include:
Various conventionally known ones can be mentioned,
For example, U.S. Pat.
No. 53-50736, No. 51-113624 and No. 53-3819
The so-called dye-releasing redox compounds described in each publication of the above issues, such as JP-A-49-111628 and JP-A-51
Non-diffusible color images that can release diffusible dyes in an alkaline medium as described in Publications No. 63618, but whose rate of release is reduced if they react with the oxidation products of the silver halide developer beforehand. forming substances, such as the so-called BEND compounds described in JP-A-53-110827 and JP-A-53-110828, and the so-called diffusible dye-releasing couplers described in U.S. Pat. No. 3,227,550, which are inherently alkaline During,
those which are non-diffusible and which, as a result of treatment with an alkaline processing composition, can release dyes or dye precursors that are diffusible in an alkaline medium as a function of exposure, as well as, for example, U.S. Pat.
Nos. 3,880,658, 3,854,945 and 3,563,739, the so-called dye developers are inherently diffusive in alkaline media and as a result of processing with alkaline processing compositions, as a function of exposure, Examples include those that are diffusible. The color image-forming substances preferably used in the present invention are the above-mentioned color image-forming substances that are inherently non-diffusible in an alkaline medium, and also include anionic diffusible dyes or Diffusible dye precursors are released, and preferred among them are dye-releasing redox compounds and
BEND compounds, particularly preferably dye-releasing redox compounds. The photographic element for color diffusion transfer according to the present invention may be one in which the image-receiving layer according to the present invention is coated on a support. That is, the image-receiving layer according to the present invention may be coated on the timing layer of a support on which a neutralization layer containing an acid substance and a timing layer are coated in order, or the above-mentioned neutralization layer and timing layer may be coated. First, the image-receiving layer according to the present invention may be coated directly onto the support.
The support may be transparent or opaque depending on the purpose. The coating thickness of the image-receiving layer according to the present invention can be varied depending on the purpose, and is optimally about 3 to 10 microns. Photographic elements according to the invention can be used in conventionally known photographic materials for color diffusion transfer. A preferred photographic material for color diffusion transfer comprises a first support having an image-receiving layer according to the invention, at least one light-sensitive silver halide emulsion layer combined with a color image-forming substance and a processing sheet or second support. have The image-receiving layer and the emulsion layer need only be in a superimposed state during processing, and may or may not be superimposed before and after processing. The silver halide emulsion layer may be present as a constituent layer of the photographic element according to the present invention on the support (first support) having the image-receiving layer, or may be present on a separate support (second support). body). When the emulsion layer is present on the first support as a constituent layer of the photographic element, its position may be between the first support and the image-receiving layer, or between the first support and the image-receiving layer. It may be on the opposite side of the support. When the emulsion layer described above is present on the first support, the color diffusion transfer photographic material uses a processing sheet as the first support of the photographic element to facilitate the spread of processing solutions onto the emulsion layer. It is preferable that the layer be superimposed on the constituent layer located at the farthest position from the support, or have such a structure that it can be overlapped during processing. A first preferred photographic material for color diffusion transfer using the photographic element according to the invention has (1) a first preferably transparent support and an image-receiving layer according to the invention as an essential layer thereon; a photographic element and (2) a second light-sensitive silver halide emulsion layer having at least one light-sensitive silver halide emulsion layer in combination with a color image-forming material;
A second preferable one comprises (1) a preferably transparent support and an image-receiving layer and a color image-forming material according to the present invention combined thereon in order as an essential layer; a photographic element having at least one light-sensitive silver halide emulsion layer, and (2) a preferably transparent silver halide emulsion layer overlaid or capable of being overlaid on the layer furthest from the support of the photographic element. The latter type of photographic material having a treated sheet is particularly preferred. The photographic elements and photographic materials for color diffusion transfer according to the present invention are further useful in film units for color diffusion transfer. It has an alkaline treatment composition-containing means adapted to release. Photographic elements, photographic materials, and film units for color diffusion transfer according to the present invention may optionally include an acid substance-containing layer (neutralizing layer), a neutralization rate adjusting layer (timing layer), and a reflective agent (containing layer). , an opacifier-containing layer, a release layer, etc. can be used. When the neutralization layer and the timing layer are provided on a support having the image-receiving layer or silver halide emulsion layer according to the present invention described above, the neutralization layer and the timing layer are formed on the support and the image-receiving layer or halogenated silver halide layer according to the present invention provided thereon. It is preferable to provide a neutralization layer and a timing layer in this order from the support side between the silver emulsion layers. Further, when provided on a support having both an image-receiving layer and a silver halide emulsion layer according to the present invention, a neutralizing layer and a timing layer are placed between the support, the image-receiving layer, and the emulsion layer in this order from the support side. It is preferable to provide one. Further, when a neutralizing layer and a timing layer are provided on the above-mentioned treated sheet, it is preferable to provide the neutralizing layer and the timing layer in this order on the treated sheet. The reflective agent-containing layer and the opacifying agent-containing layer are provided on the support having both the image-receiving layer and the silver halide emulsion layer according to the present invention in the following order: the image-receiving layer, the reflective agent-containing layer, the opacifying agent-containing layer, and the emulsion layer. It is preferable. The release layer is preferably provided on a support having both an image-receiving layer and a silver halide emulsion layer according to the present invention, and between the image-receiving layer and the emulsion layer. Further preferred photographic elements, photographic materials, and film units for color diffusion transfer having an image-receiving layer according to the present invention include a first, preferably transparent support, and a neutralizing layer and a timing layer thereon in order as essential layers. , a photographic element having an image-receiving layer according to the invention, said photographic element and a second preferably opaque support having at least one light-sensitive silver halide emulsion layer in combination with a color image-forming material as an essential layer. A film unit having means for containing a photographic material and an alkaline processing composition containing a reflector and an opacifying agent adapted to release the photographic material and its contents between the image receiving layer and the emulsion layer. Yet another preferred example is an image-receiving layer, a reflector-containing layer, an opacifying agent-containing layer and a color image-forming substance according to the present invention combined in this order as essential layers on a preferably transparent support. a photographic element having at least one light-sensitive silver halide emulsion layer; a photographic element having at least one light-sensitive silver halide emulsion layer; A film unit having means for containing an alkaline processing composition adapted to discharge an alkaline processing composition containing a curing agent between the timing layer and the emulsion layer. Particularly preferred in the present invention are:
The latter type of photographic element, photographic material, film unit. When obtaining a multicolor dye image using the photographic material for color diffusion transfer according to the present invention, two combination units of a light-sensitive silver halide emulsion layer and a color image forming substance are used.
It is preferable to use more than one set, and when the color sensitivities of the above-mentioned combined units are different, it is advantageous to use an intermediate layer between the combined units. The intermediate layer prevents undesirable interactions between the combined units and controls the diffusivity of the diffusible dye or its precursor and the alkaline processing composition. A protective layer can be provided at a position in contact with the processing composition in the photographic material for color diffusion transfer according to the present invention, if necessary. The color imaging material should be positioned so as not to reduce the sensitivity of the light-sensitive silver halide emulsion with which it is combined. That is, if the absorption wavelength range of the color image-forming material used overlaps the light-sensitive wavelength range of the light-sensitive silver halide emulsion layer with which it is combined, then the color image-forming material is exposed to the light-sensitive silver halide emulsion layer with which it is combined. It is desirable to contain it in a layer located on the opposite side of the direction. On the other hand, in color image-forming substances that do not have a dye structure during exposure, such as ordinary color-forming couplers, color image-forming substances that have a leuco-type dye, and color image-forming substances that have a short wavelength shift type dye, the emulsion Since it does not reduce the sensitivity, it can be contained in a photosensitive silver halide emulsion layer, and furthermore, it can be contained in a layer located in the exposure direction with respect to the silver halide emulsion layer. As the light-sensitive silver halide emulsion to be combined with the color image-forming substance in the photographic material for color diffusion transfer according to the present invention, various kinds of emulsions can be used in addition to negative-working light-sensitive silver halide emulsions. For example, when attempting to obtain a positive-working diffusion transfer dye image using a color image-forming material that, when simply combined with a negative-working light-sensitive silver halide emulsion, produces a negative-working diffusion transfer dye image, Various conventionally known inversion methods can be applied. For example, U.S. Patent No. 3227552, U.S. Patent No. 2592250
No. 2005837, No. 3367778, No.
3761276, British Patent No. 1011062, Tokkosho
A method using a direct positive silver halide emulsion as described in JP-A No. 41-17184, JP-A-50-8524, etc., or British Patent No. 904364, JP-A-47-325 In this method, a negative photosensitive silver halide emulsion layer and an adjacent layer containing physical development nuclei are usually used. In addition, special public service No. 43-21778
A color image-forming substance is added to a fogged silver halide emulsion layer as described in US Pat. Methods can be used, such as using a negative-working light-sensitive silver halide emulsion layer containing a compound that reacts to release a development inhibitor. Various conventionally known materials can be used for the above-mentioned neutralizing layer, timing layer, light reflecting layer, opacifying layer, intermediate layer, protective layer, and release layer. In the present invention, a preferred color diffusion transfer photographic material for obtaining a multicolor dye image includes an image receiving layer, a light reflecting layer, an opacifying layer, an image receiving layer, a light reflecting layer, an opacifying layer, etc. between two transparent supports as essential layers in order during processing. Cyan image forming material layer, red sensitive silver halide emulsion layer, interlayer, magenta image forming material layer, green sensitive silver halide emulsion layer, interlayer, yellow image forming material layer, blue sensitive silver halide emulsion layer , a protective layer, a timing layer, a neutralizing layer, wherein an alkaline treatment composition containing an opacifying agent can be distributed between said protective layer and said timing layer, or as an essential layer in order. , a cyan image-forming material layer, a red-sensitive silver halide emulsion layer, an intermediate layer, as essential layers between the opaque support and the transparent support in order from the opaque support side,
It has a magenta color image forming material layer, a green sensitive silver halide emulsion layer, an intermediate layer, a yellow color image forming material layer, a blue sensitive silver halide emulsion layer, a protective layer, an image receiving layer, a timing layer, a neutralizing layer, and is opaque. The alkaline processing composition containing a curing agent can be distributed between the protective layer and the image-receiving layer, and the former is particularly preferred. The processing composition for processing the photographic material for color diffusion transfer according to the present invention is usually an alkaline processing composition, contains an alkaline agent, and has a pH of about 10 or higher at room temperature. This treatment composition provides alkaline conditions. The treatment composition preferably contains a thickening agent and typically has a viscosity of about 100 to 300,000 centipoise.
This allows uniform distribution of the processing composition during processing and also provides a non-flowing film during processing to prevent undesirable image changes after substantial color image formation. are doing. When the dye image-forming substance used itself does not have a silver halide developing function, a silver halide developing agent is used.
Further, even when the color image forming substance itself has a silver halide developing action, it is preferable to use a silver halide developing agent as an auxiliary agent. These silver halide developing agents are usually included in processing compositions and/or processing composition-permeable layers in photographic materials. In addition, the processing composition may contain a silver halide solvent and the like, depending on the silver halide emulsion used, and may also contain various commonly used additives. As a means for applying the processing composition to the photographic material for color diffusion transfer according to the present invention, various conventionally known means can be used, but preferably a container that can be destroyed during processing is used. Preferably, it is stored in EXAMPLES The superiority of the photographic element according to the present invention will be illustrated below with examples, but the present invention is not limited thereto. EXAMPLE 1 Photographic elements were prepared by coating the following layers on transparent polyethylene terephthalate to determine the whiteness with and without brighteners and with conventional brighteners and the brighteners of the present invention. compared. (a) Styrene, N-benzyl-N,N-dimethyl-N-methacrylaminobenzylammonium chloride and divinylbenzene (48:48:
4) Image-receiving layer made of copolymer (27mgr/100cm ² ) and gelatin (27mgr/100cm ² ) (b) Layer made of titanium dioxide (187mgr/100cm ² ) and gelatin (27mgr/100cm ² ) (c) Carbon Photographic element A (blank) consisting of a layer or more consisting of black (17 mgr/100 cm ² ) and gelatin (13 mgr/100 cm ² ), (B) with 0.6 mgr/100 cm ² of exemplified compound-(1) added to (A). ) (photographic element according to the present invention). (C) (photographic element according to the present invention) was obtained by adding 0.6 mgr/100 cm ² of exemplified compound-(4) to (A). For comparison, 0.6 mgr/100 cm ² of a whitening agent represented by the following structural formula as a whitening agent other than the one used in ordinary color printing other than the present invention was added to (a). The reflection densities of these samples were compared at 340 to 400 nm, and the value at 360 nm is shown as a representative value. Photographic element Reflection density (360nm) (A) 1.10 (B) 0.52 (C) 0.41 Comparison 0.59 As is clear from the above, when the compound of the present invention is added to the image-receiving layer, it has a whitening effect comparable to that of ordinary whitening agents. I understand what is shown. Furthermore, even when (B) and (C) were soaked in pure water for 10 minutes, almost no fluorescent brightener was eluted. (Reflection density: (B) 0.55 (C) 0.43) Example 2 The photographic elements (A) and (B) described in Example 1 were coated with the following layers on top of layer (C) to produce a monochromatic color. Photographic elements for diffusion transfer (D) (blank) and (E) (invention) were prepared. (d) Cyan image forming substance (6.0mgr/100cm ² ) and gelatin (15mgr/100cm 2 ) having the following structural formula:
cm ² ) layer (e) Red-sensitive internal latent image type silver chlorobromide emulsion (16mgr/
100cm ² ) Gelatin (17mgr/100cm ² ) 1-[4-
Layer consisting of (2-formylhydrazino)phenyl]-3-phenylthiourea (0.6 mgr/1 mol of silver), potassium 2-octadecyl-hydroquinone-5-sulfonate (12 gr/1 mol of silver) (f) Gelatin (10 mg) /100cm ² ) layer Furthermore, for comparison, a stilbene-based fluorescent brightener having the following structural formula, which is used in ordinary color photography, was added to layer (A) of photographic element (D) (0.6mgr/100cm2).
cm ² ) photographic element (F) was prepared. Samples (D) to (F) prepared as above were imagewise exposed, and then a transparent treatment sheet prepared as below was superimposed to produce a photographic material for color diffusion transfer. A film unit for monochromatic color diffusion transfer is made by attaching a cleavable container containing 1.0 ml of the alkaline processing composition described in .
The alkaline processing composition was spread between the gelatin layer and the processing sheet to a thickness of about 80 .mu.m by passing the film unit between a pair of pressure rollers having a defined gap. [Preparation of treated sheet] The following layers (1) to (3) were sequentially coated on a polyethylene terephthalate film support. (1) Polyacrylic acid and butyl polyacrylate
70:30 copolymer (155mg/ ^100cm2 ) (2) 5-(2-cyanoethylthio)-1-phenyltetrazole (1.1mgr/ ^100cm2 ), cellulose acetate (40% wt acetylated)
(43 mgr/100 cm ² ), 95:5 copolymer of polystyrene and polymaleic anhydride (1.1 mgr/100
cm ² ) (3) Copolymer of polyacrylonitrile, polyvinylidene chloride, and polyacrylic acid (weight ratio 14:80:6) (21.5mgr/100cm ² ) [Alkaline treatment composition] Potassium hydroxide 47.0gr Methylhydroquinone 0.1gr t-butylhydroquinone 0.3gr 4-hydroxymethyl-4-methyl-1-phenylpyrazolidone 12.0gr 5-methyl-1,2,3-benzotriazole
3.8 gr carboxymethyl cellulose 46.8 gr Potassium fluoride 6.0 gr Sodium sulfite (anhydrous) 1.1 gr 1,4-cyclohexane methanol 1.1 gr Water was added and after a few minutes a cyan image was observed through the support of the photographic element. Table 1 shows the results of measuring the maximum density (D _nax ) and minimum density (D _nio ) of photographic elements (D) to (F) using a red filter.

[Table] As is clear from the above example, the compounds used in the present invention do not reduce the density of dye images, whereas the stilbene-based fluorescent brighteners commonly used in photography significantly reduced color image density. (Regarding improvement of white background) The following is a comparison of the reflection densities at 360 nm at 360 nm as representative values of the photographic elements obtained by exposing each of the above photographic elements (D) to (F) in the same manner and processing them in the same way. It is clear that the white background has also been improved.

[Table] Example 3 The following layers (D)' and (E)' were sequentially provided on layers (C) of photographic elements (A) and (C) of Example 1 to form photographic element (G) blanks and
(H) (this invention) was created. (Magenta monochromatic color diffusion transfer photographic element) (d)′ Magenta color image forming substance having the following structural formula 8.0mgr/ ^100cm2 and gelatin 16.0mgr/ ^100cm2
Layer (e)′ Insulating internal latent image type silver chlorobromide emulsion (silver amount 16 m
gr/100cm ² ), gelatin (17mgr/100cm ² ) 1-
[4-(2-formylhydrazino)phenyl]-
3-phenylthiourea (0.45mgr/1 mole of silver),
A layer consisting of potassium 2-octadecylhydroquinone-5-sulfonate (12 gr/1 mole of silver) Furthermore, as a comparison, the layer (a) of the photographic element (G) has the general structural formula shown in U.S. Pat. No. 4,115,124. A photographic element (I) to which a photographic fluorescent brightener was added (0.42 mgr/100 cm ² ) was prepared. After imagewise exposure, treatment with an alkaline treatment composition was carried out in the same manner as in Example 2. A magenta image was observed through the support after 7-10 minutes. Maximum density (D _nax ) and minimum density (D _nio ) of each color image
The results of measuring using a green filter (Table-
2).

[Table] As is clear from the table, a decrease in D _nax was observed with commonly used fluorescent brighteners, whereas no decrease in D _nax occurred with the brightener used in the present invention. In addition, a decrease in photographic sensitivity was observed in photographic element (I) (comparison) compared to (G) (blank). However, this was not the case with photographic element (H) (invention). The improvement in the white background was as follows, and it was clearly improved.

[Processing sheet]

The following layers (1)' to (3)' were sequentially coated on a polyethylene terephthalate film support. (1)' Copolymer of polyacrylic acid and polybutyl acrylate in a weight ratio of 70:30 (194mgr/100cm ² ) (2)' Copolymer of polystyrene and polymaleic anhydride in a molar ratio of 1:1 (22mgr /100cm ² ) (3)′ Copolymer of polyacrylic acid, polyvinylidene chloride and polyacrylonitrile in a weight ratio of 6:80:14 (22mgr/100cm ² ) Furthermore, cleavage containing 1.0ml of the following alkaline treatment composition A gelatin layer of (e) is spread between the treated sheets to a thickness of about 80 μm by passing the treatment composition between a pair of juxtaposed gapped pressure rollers. Ta. A color image was observed after 7-10 minutes. The maximum concentration (D _nax ) and minimum concentration (D _nio ) are shown in (Table 3). [Viscous treatment liquid] Potassium hydroxide 56.0gr 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone 8.0gr t-butylhydroquinone 0.2gr 5-methyl-1,2,3-benzotriazole
2.4gr Sodium sulfite (anhydrous) 2.0gr Carbon black 100.0gr Carboxymethyl cellulose 51.0gr Benzyl alcohol 10.0ml Add water 1

[Table] As is clear from the above, the photographic element (L) using a general fluorescent brightener lowers D _nax , whereas the photographic element (K) of the present invention lowers D _nax . No decrease was observed. Regarding the improvement of the white background, it is as follows, and it is clearly improved. (Reflection density under 360nm) (J) 1.15 (K) 0.58 (L) 0.70

Claims (1)

[Scope of Claims] 1. A photographic element for color diffusion transfer having an image-receiving layer on a support, wherein the image-receiving layer has the following general formula []
A photographic element for color diffusion transfer, characterized in that it contains an organic fluorescent brightener represented by: General formula [] (In the formula, X ₁ and X ₂ represent a methyl group, 2-hydroxyethyl group, or 2-hydroxypropyl group, and furthermore, X ₁ and X ₂ may jointly form a morpholine ring with a nitrogen atom, Y ₁ and Y ₂ consist of a hydrogen atom (however, both Y ₁ and Y ₂ are not hydrogen atoms), a methyl group, a 2-hydroxyethyl group, a 2-hydroxypropyl group, a 2-sulfoethyl group, or a salt thereof. represents the group,
Furthermore, Y ₁ and Y ₂ may jointly form a morpholine ring together with a nitrogen atom, and Z is a halogen atom or a group -O-A (A represents an alkyl having 1 to 4 carbon atoms) M represents a hydrogen atom, a potassium atom or a sodium atom. )