JPH045376B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a processing composition for silver salt diffusion transfer and an image forming method using silver salt diffusion transfer. (Prior Art) Image forming methods by diffusion transfer using silver salts such as silver halides are well known. Specifically, the method includes, for example, treating an imagewise exposed photosensitive silver halide emulsion layer with an alkaline aqueous solution containing a developer and a silver halide solvent, and converting the exposed silver halide grains into silver by the developer. On the other hand, unexposed silver halide grains are converted into a transferable silver complex salt using a silver halide solvent, and this silver complex salt is diffused by a silver precipitant-containing layer (image-receiving layer) that is superimposed on the emulsion layer. - It consists of transferring and then reducing the silver complex salt with a developer with the help of a silver precipitant to obtain a silver image. When carrying out this method, for example, a light-sensitive element having a light-sensitive silver halide emulsion layer on a support, an image-receiving element having an image-receiving layer containing a silver precipitant on a support, a developer, a halogenated A film unit is used which combines a processing element consisting of a breakable container containing an aqueous activated alkaline solution containing a silver solvent and a thickener. First, the emulsion layer of the light-sensitive element is imagewise exposed, and then the light-sensitive element and the image-receiving element are overlapped so that the emulsion layer and the image-receiving layer of the image-receiving element face each other, while the processing element is destroyed and a viscous alkaline aqueous solution is developed. The image-receiving element is passed between a pair of rollers as shown in FIG. Hydroxylamine compounds described in U.S. Pat. (temperature, packaging form, etc.) requires very strict control, and improvements in this respect have been desired. The present inventors searched for a developer that is stable for long-term storage and has high activity, and found that it is effective to use a hydroxyamine dicarboxylate salt as shown in the general formula. When image prints made using salt were left for several months, white crystals began to precipitate on the surface of the prints. As a result of investigating the cause, it was found that dicarboxylic acids promote the precipitation of crystals. (Object of the Invention) An object of the present invention is to provide a novel image forming method using silver salt diffusion transfer. Another object of the present invention is to provide a developer for silver salt diffusion transfer method that is stable during long-term storage. Another object of the present invention is to provide a silver salt diffusion conversion processing composition that does not cause crystals to appear on the image surface after image formation. (Structure of the Invention) As a result of intensive studies on a highly active developer that can withstand long-term storage and a method of obtaining prints that can withstand long-term storage, the above objectives were achieved by developing a composition containing a compound represented by the following general formula (). This was achieved by a processing composition for silver salt diffusion transfer, which comprises as a developer a composition obtained by removing about 50 to about 98 mol % of dicarboxylic acid based on hydroxylamine from a product. In the formula, R ₁ represents an alkyl group or an alkoxyalkyl group, R ₂ represents hydrogen, an alkyl group, or an alkoxyalkyl group, and n represents an integer of 0 to 3. The composition containing the compound represented by the above general formula () is preferably an aqueous solution containing the compound, but solvents other than water, such as methanol, ethanol, or dimethylformamide, may also be used. The above aqueous solution may contain 50% (by weight) or less, preferably 10% (by weight) or less of a solvent other than the above-mentioned water. Generally, hydroxylamine dicarboxylic acid salts can be synthesized by dissolving hydroxylamine and dicarboxylic acid in a solvent and separating the precipitated hydroxylamine dicarboxylic acid (preferably under cooling). As for the solvent used, hydroxylamine and dicarboxylic acid have high solubility, but hydroxylamine/dicarboxylic acid preferably has low solubility, and the amount of dicarboxylic acid used is usually 1 to 5 times the molar equivalent of hydroxylamine. Preferably, 2 to 3 molar equivalents are used. In addition, as an acid that generally forms a salt with hydroxylamine,
Examples include hydrochloric acid, sulfuric acid, phosphoric acid, dicarboxylic acid and p-toluenesulfonic acid, but dicarboxylic acid is preferable from the viewpoint of synthesis since dicarboxylic acid easily crystallizes from hydroxylamine. Compositions containing hydroxylamine dicarboxylate, especially hydroxylamine from an aqueous solution,
Typical methods for removing about 50 mol% to about 95 mol% of dicarboxylic acids are (1) Precipitation as an alkali dicarboxylic acid by adding an alkali agent.As an alkali agent, alkali metal hydroxides, carbonates, and phosphates are used. , borate is preferred;
Preferred alkali metals are sodium, potassium, calcium, and barium, with sodium carbonate being the most preferred. The amount of dicarboxylic acid removed is determined by the amount of alkaline agent added. (2) Ion exchange method using anion exchange resin Typical exchange groups are OH and Cl groups, but
Most preferred is the OH group. Although both strongly basic and weakly basic anion exchange resins are suitable, strongly basic anion exchange resins are most suitable. The amount of dicarboxylic acid removed is determined by the type of anion exchange resin, its amount, and the contact time of the resin with the aqueous hydroxylamine solution. The above object is achieved by the following aspects. The imagewise exposed photosensitive silver halide emulsion layer is developed in the presence of a developer, a silver halide solvent and an alkali to convert at least a portion of the unexposed silver halide in the emulsion layer into a transferable silver complex salt. In an image forming method by diffusion transfer, which includes transferring at least a portion of a complex salt to an image receiving layer containing a silver precipitant-containing layer to form an image on the image receiving layer, a composition containing a compound represented by the following general formula () 1. An image forming method by silver salt diffusion transfer, characterized in that a composition obtained by removing about 50 to about 98 mol % of dicarboxylic acid based on hydroxylamine from a product is used as a developer. In the formula, R ₁ represents an alkyl group or an alkoxyalkyl group, R ₂ represents hydrogen, an alkyl group, or an alkoxyalkyl group, and n represents an integer of 0 to 3. Preferably, from an aqueous solution containing a compound represented by the following general formula (), approximately
This is an image forming method by silver salt diffusion transfer, characterized in that an aqueous solution obtained by removing 50 to about 98 mol% of dicarboxylic acid is used as a developer. In the formula, R ₁ represents an alkyl group or an alkoxyalkyl group, R ₂ represents hydrogen, an alkyl group, or an alkoxyalkyl group, and n represents an integer of 0 to 3. In the image forming method described above, it is preferable to treat the image-exposed photosensitive silver halide emulsion layer with an alkaline processing composition containing a developer and a silver halide solvent, which will be described in detail below. Hydroxylamine as a developer is preferably contained in an amount of 0.1 to 15 g, most preferably 1 g to 5 g, per 100 g of the processing composition. Furthermore, a 1-aryl-3-pyrazolidinone compound described in the invention disclosed in Japanese Patent Publication No. 49-13580 may be used in combination as a developer. Silver halide solvents may be present in the processing element, the light-sensitive element and/or the image-receiving element. Among these, the processing element is the most preferred. The cyclic compounds described in US Pat. No. 2,857,274, US Pat. No. 2,857,275 and US Pat. No. 2,857,276 are suitable, with uracil, urazol, 6-methyluracil and the like being preferred examples. Further preferred are alkali metal thiosulfates, especially the sodium or potassium salts, and also as described in U.S. Pat.
No. 3958992, No. 3976647, No. 4009167, No. 4032538, No. 4046568, No. 4047954,
No. 4047955, No. 4107176 and JP-A-47-
330 disulfonylmethane compounds and U.S. patent no.
Sulfur uracil compounds of U.S. Patent Nos. 4126459, 4150228, 4211559 and 4211562, and U.S. Pat.
You can choose from aminothioethers No. 4267256. These may be used alone or in combination, and when two or more cyclic imide compounds are used in combination, there is an advantage that white crystals will not precipitate on the surface of the print even if the print is stored for a long period of time. The amount of silver halide solvent added is 100g of the processing composition.
It is preferable to contain 0.1 to 30g per serving, and 0.5g
~10g is most preferred. Examples of hydroxylamine dicarboxylate salts are shown below. Where the processing composition of the present invention is applied by distributing it as a thin layer between a superimposed photosensitive element and an image receiving element, especially when these elements are distributed in a superimposed relationship. Preferably, the treatment composition includes a polymeric film forming agent, thickening agent, or thickening agent.
Hydroxyethylcellulose and sodium carboxymethylcellulose are particularly useful for this purpose and are included in the processing composition at concentrations effective to provide the appropriate viscosity according to known principles of diffusion transfer photography. The processing composition may further contain other auxiliaries known in silver salt diffusion transfer processes, such as antifoggants, toning agents, stabilizers, and the like. In particular, the inclusion of oxyethylamino compounds, such as triethanolamine, is useful for increasing the shelf life of treatment compositions, as described in US Pat. No. 3,619,185. The treatment composition of the present invention is preferably housed in a breakable container to serve as a treatment element. Any known breakable container and its material can be used, and these are described, for example, in US Pat. No. 3,056,491, US Pat.
It is described in detail in No. 3173580, No. 3750907, No. 3833381, No. 4303750, No. 4303751, etc. On the other hand, the image-receiving element used in the present invention includes a support carrying an image-receiving layer of an alkali-permeable polymer (especially regenerated cellulose) containing a silver precipitant, such as baryta paper, cellulose triacetate or polyesters. Such image-receiving elements can be prepared by coating an optionally primed support with a coating solution of a suitable cellulose ester, such as cellulose diacetate, in which a silver precipitant is dispersed. The obtained cellulose ester layer is subjected to alkaline hydrolysis to convert at least a depthwise portion of the cellulose ester into cellulose. In a particularly useful embodiment, the unhydrolyzed portion of the cellulose ester layer containing the silver precipitant and/or the underlying unhydrolyzed cellulose ester, such as cellulose diacetate, is Contains one or more mercapto compounds suitable for improving the color tone, stability or other photographic properties of the image. Such mercapto compounds are utilized during imbibition by diffusing from the position where they are initially placed. This type of receiving element has been described in U.S. Pat.
Described in No. 3607269. Examples of suitable silver precipitants include heavy metals such as iron, lead, zinc, nickel, cadmium, tin, chromium, copper, cobalt, especially noble metals such as gold,
There are silver, platinum and palladium. Other useful silver precipitants are heavy metal sulfides and selenides, especially mercury, copper, aluminum, zinc, cadmium, cobalt, nickel, silver, lead, antimony, bismuth, cerium and magnesium sulfides, and lead, zinc, Mention may be made of antimony and nickel selenide. The function of materials such as silver precipitants in silver salt diffusion transfer methods is described, for example, in US Pat. No. 2,774,667. Further, it is preferable to provide a neutralizing acidic polymer layer between the image-receiving layer and the support. Preferred acidic polymers include copolymers of unsaturated carboxylic acids such as acrylic acid, maleic acid, methacrylic acid, itaconic acid, and crotonic acid, acidic cellulose derivatives, and the like. Specific examples include butyl acrylate/acrylic acid copolymer, cellulose acetate hydrogen phthalate, ethyl methacrylate/methacrylic acid copolymer, and methyl methacrylate/methacrylic acid copolymer. In addition, polymers containing sulfonic acid groups such as polystyrene sulfonic acid and acetalized products of benzaldehyde sulfonic acid and polyvinyl alcohol are also useful. Furthermore, it is preferable to provide an intermediate layer between the image-receiving layer and the layer containing a toning agent or stabilizer. Preferred materials for the intermediate layer include gum arabic, polyvinyl alcohol, and polyacrylamide. Further, it is preferable to provide a peeling layer on the surface of the image-receiving layer in order to prevent the treatment composition from adhering to the surface of the image-receiving layer when the treatment composition is peeled off after being spread.
Preferred materials for such a release layer include gum arabic, hydroxyethyl cellulose, methyl cellulose, polyvinyl alcohol, polyacrylamide, and sodium alginate, as well as U.S. Pat.
3772024, 3820999 and UK Patent No.
Examples include those described in No. 1360653. In particular embodiments of the invention, image-receiving layers can be incorporated into the photosensitive elements described below. For example, on a transparent polyethylene terephthalate sheet, in order, an image-receiving layer containing a silver precipitant, a light-reflecting layer containing a white pigment such as titanium dioxide, a light-shielding layer containing a light-absorbing substance such as carbon black, and a photosensitive halogen A preferred example is one provided with a silver oxide emulsion layer. In such an embodiment, the light-reflecting layer shields the layer behind the photosensitive silver halide emulsion layer after the diffusion transfer process, so that the image formed on the image-receiving layer can be observed through the polyethylene terephthalate sheet. can do. Further, the photosensitive element used in the present invention is obtained by coating a photographic emulsion as detailed below on a support. In the photographic emulsion of the present invention, any of silver bromide, silver iodobromide, silver iodochlorobromide, silver chlorobromide and silver chloride may be used as the silver halide. Preferred silver halides are silver iodobromide or silver iodochlorobromide containing 10 mol % or less of silver iodide. Particularly preferred is silver iodobromide containing from 3 mol % to 10 mol % silver iodide. The average grain size of the silver halide grains in the photographic emulsion (the grain size is the grain diameter in the case of spherical or approximately spherical grains, the ridge length in the case of cubic grains,
(expressed as an average based on the type of projection surface) is not particularly limited, but is preferably 3μ or less, preferably 1.5μ or less,
Particularly preferred is 0.8 to 1.2μ. The particle size distribution may be narrow or wide. The silver halide grains in the photographic emulsion may have an equiaxed crystal form such as a cube or an octahedron, or may have an irregular crystal form such as a spherical shape or a plate shape, or may have an irregular crystal shape such as a spherical shape or a plate shape. It may also have a compound form. It may also consist of a mixture of particles of various crystalline forms. The interior and surface layers of the silver halide grains may be composed of different phases, or may be composed of a uniform phase. Further, the particles may be particles in which the latent image is mainly formed on the surface, or may be particles in which the latent image is mainly formed inside the particles. Particles in which latent images are mainly formed on the surface are preferred. The thickness of the photographic emulsion layer is 0.5-8.0μ, especially 0.6-6.0μ
, and the coating amount of silver halide grains is 0.1 to 3
g/m ² , preferably 0.2 to 1.5 g/m ² . The photographic emulsion used in the present invention is written by P. Glafkides.
Chimie et Physique Photographique (Paul
Montel, 1967) Written by GFDuffin
Photographic Emulsion Chemistry (The Focal
Press, 1966), VLZelikman et al.
Making and Coauing Photographic Emulsion
(The Focal Press, 1964). That is, any of the acidic method, neutral method, ammonia method, etc. may be used, and the methods for reacting the soluble silver salt and soluble halogen salt include one-sided mixing method, simultaneous mixing method,
Any combination thereof may be used. It is also possible to use a method in which particles are formed in an excess of silver ions (so-called back-mixing method).
As one type of simultaneous mixing method, a method in which PAg in the liquid phase in which silver halide is produced can be kept constant, that is, a so-called controlled double jet method can also be used. According to this method, a silver halide emulsion having a regular crystal shape and a substantially uniform grain size can be obtained.
Two or more types of silver halide emulsions formed separately may be mixed and used. In the process of silver halide grain formation or physical ripening, a cadmium salt, a zinc salt, a lead salt, a thallium salt, an iridium salt or a complex salt thereof, a rhodium salt or a complex salt thereof, an iron salt or an iron complex salt, etc. may be present. Soluble salts are usually removed from the emulsion after precipitate formation or physical ripening, and the long-known Nudel water washing method, which involves gelatinization of gelatin, may be used. Inorganic salts (e.g. sodium sulfate), anionic surfactants, anionic polymers (e.g. polystyrene sulfonic acid) or gelatin derivatives (e.g. aliphatic acylated gelatin,
A sedimentation method (flocculation) using aromatic acylated gelatin (eg, aromatic acylated gelatin) may also be used. The process of removing soluble salts may be omitted. The silver halide emulsion may be a so-called primitive emulsion which is not chemically sensitized, but it is usually chemically sensitized. For chemical sensitization, see the above-mentioned books by Glafkides, Duffin and Zellikman et al., or Grundlagen der edited by H. Frieser.
Photographischen Prozesse mit
Silberhalogenidemulsionen (Akademische
Verlaggesellschaft.1968) can be used. The silver halide emulsion used in the present invention may contain an antifoggant or a stabilizer. Compounds with such properties are listed in Research Disclosure, Volume 176 (17643).
Those described in the section "Antifoggants and stabilizers" on page 24 can be used. The silver halide emulsion may contain a developing agent. As a developing agent, Research Disclosure Vol. 176 (17643) No. 29
You can use the ones listed in the ``Developing agents'' section of the page. Silver halide can be dispersed in colloids that can be hardened with various organic or inorganic hardeners.
As a hardening agent, Research Disclosure Volume 176 (17643) No. 26
Those described in the section "Hardeners" on page 1 may be used. Silver halide emulsions may contain coating aids. As a coating aid, Research Disclosure Volume 176 (17643) No. 26
Those listed in the section ``Coating aids'' on page 1 can be used. Silver halide photographic emulsions may also contain antistatic agents, plasticizers, fluorescent brighteners, air antifoggants, and the like. The silver halide emulsion used in the present invention uses Research Disclosure (Research Disclosure) as a vehicle.
Disclosure) Volume 176 (17643) Page 26, Section ``Vehicles and vehicle extenders'' (1971)
Use the vehicle listed in December). The silver halide emulsion is coated on a support along with other photographic layers if necessary. Application method: Research Disclosure
“Coating and
The methods described in ``drying procedures'' can be used. Further, as the support, those described in the section "Supports" on page 28 of Research Disclosure, Vol. 176 (17643) can be used. The photographic emulsion used in the present invention contains, for example, polyalkylene oxide or its derivatives such as ethers, esters, and amines, thioether compounds, etc. for the purpose of increasing sensitivity, increasing contrast, or promoting development.
It may also contain thiomorpholins, quaternary ammonium salt compounds, urethane derivatives, urea derivatives, imidazole derivatives, 3-pyrazolidones, and the like.
For example, U.S. Patent Nos. 2400532, 2423549, 2116062, 3617280, 3772021,
Those described in the same No. 3808003 etc. can be used. The photographic material prepared according to the present invention may contain a water-soluble dye in the photographic emulsion layer or other hydrophilic colloid layer as a filter dye or for various purposes such as preventing irradiation. Such dyes include oxonol dyes, hemioxonol dyes, styryl dyes, merocyanine dyes, cyanine dyes and azo dyes. Among them, merocyanine dyes such as oxonol dyes and hemioxonol dyes are useful. Dyes may be mordanted in certain layers by cationic polymers such as dialkylaminoalkyl acrylates. In the photosensitive material produced according to the present invention, when the hydrophilic colloid layer contains dyes, ultraviolet absorbers, etc., they may be mordanted with a cationic polymer or the like. For example, UK patent no.
685475, U.S. Patent No. 2675316, U.S. Patent No. 2839401
No. 2882156, No. 3048487, No.
3184309, 3445231, West German Patent Application (OLS) No. 1914362, JP-A-50-47624, 50
Polymers described in No.-71332 and the like can be used. Exposure to obtain a photographic image may be carried out using a conventional method. That is, any of the various known light sources can be used, such as natural light (sunlight), tungsten electric lamps, fluorescent lamps, mercury lamps, xenon arc lamps, carbon arc lamps, xenon flash lamps, cathode ray tube flying spots, and the like. Exposure times include not only exposure times of 1/1000 seconds to 1 second that are normally used with cameras, but also exposures shorter than 1/1000 seconds, such as exposures of 1/10 ⁴ to 1/10 ⁶ seconds using xenon flash lamps and cathode ray tubes. or exposures longer than 1 second can be used. If necessary, the spectral composition of the light used for exposure can be adjusted using a color filter. Laser light can also be used for exposure. Alternatively, exposure may be performed using light emitted from a phosphor excited by electron beams, X-rays, γ-rays, α-rays, or the like. Regarding the arrangement and combination method of each element for combining the photosensitive element, image receiving element, and processing element as described above to form a film unit, see, for example, Neblett's, HAND BOOK OF
PHOTOGRAPHY AND REPROGRAPHY
7th Edition, pages 282-285, and particularly preferred embodiments are detailed in US Pat. No. 3,350,991, which may be referred to. (Effects of the Invention) Thus, according to the structure of the present invention, the storage stability of the developer over time is greatly improved, and furthermore, there is no precipitation of crystals on the image surface after processing with a processing composition containing the developer. , excellent images can be obtained. (Examples) Hereinafter, the present invention will be explained in more detail based on Examples, but the present invention is not limited to these Examples in any way. Example 1 Removal of dicarboxylic acid salt The following three methods for removing oxalic acid using Compound 7 as hydroxylamine dicarboxylic acid were compared. Neutralization method using sodium carbonate To an aqueous solution of 71.2 kg of the compound dissolved in 1.9 g of water, (1) Add an aqueous solution of 608 g of sodium carbonate monohydrate dissolved in 1.5 g of water. (2) Add an aqueous solution of 570 g of sodium carbonate monohydrate dissolved in 1.4 of water to an aqueous solution of 71.2 kg of the compound dissolved in 2 of water. (3) Add an aqueous solution of 310 g of sodium carbonate monohydrate dissolved in 1.4 hours of water to an aqueous solution of 71.2 kg of the compound dissolved in 2 parts of water. Stir each mixture and filter the precipitate using a 30μ Pole filter. (4) Add chloroform 1 separated in the same way as in (1), separate the chloroform layer, distill it, and NN
Obtain pure dimethoxyethylhydroxylamine. Method using anion exchange resin (5) DowexSBR-P(OH)6 from Dow Chemical Company
Kg is soaked in 1N sodium hydroxide for 1 day and night. The soaked resin is filtered and washed three times with water. This is called preprocessing. Pretreated resin water16
Add 1.2 kg of Compound 7 and stir.
Filter after 3 minutes. (6) Organo Amberlight IRA68 6Kg (5)
After the same treatment as above, filter the mixture after 6 minutes. The results are shown in the table below. NN dimethoxyethylhydroxylamine and oxalic acid were both determined by liquid chromatography. Example 2 Storage stability of collected liquids Fill a brown glass bottle with the collected liquids (1) to (6), cap it, and seal it with Teflon tape to prevent it from coming into contact with air. The table below shows the number of days required for the NN dimethoxyethyl hydroxylamine content to reach 95% of the pre-storage level when stored at 40°C.

[Table] From an industrial implementation perspective, considering transportation to the place of use, this test method takes about 5 days (d95%)
is sufficient. Example 3 Photosensitive sheet Silver halide grains were formed by a single-jet method, physically ripened by a conventional method, desalted, and chemically ripened to form a silver iodobromide emulsion (with an iodo content of
5.5 mol%) was obtained. The average diameter of the silver halide grains contained in this emulsion was 0.9 microns.
0.65 mol of silver halide was contained in 1 kg of this emulsion. Each 1 kg of this emulsion was collected in a pot and dissolved in a constant temperature bath at 50°C. Ortho-sensitizing dye (3-{5-chloro-2-[2
-ethyl-3-(3-ethyl-2-benzothiazolinylidene)propenyl]-3-benzoxazolio}propane-sulfonate), panchromatic sensitizing dye (4-{2-[3-ethylbenzothiazoline-
(2-ylidene)-2-methyl-1-propenyl]
-3-Benzothiazolio}propane-sulfonate) and 4-hydroxy-6-methyl-1,3,
1% by weight aqueous solution of 3a,7-tetrazaindene10
ml, 10 ml of a 1% by weight aqueous solution of 2-hydroxy-4,6-dichlorotriazine sodium salt, 10 ml of a 1% by weight aqueous solution of sodium dodecylbenzenesulfonate, and 10 ml of a 0.1% by weight methanol solution of lipoic acid.
were added and mixed and stirred at 40°C. This finished emulsion was applied to a polyethylene terephthalate film base containing titanium dioxide as an undercoat to a dry film thickness of 3.
A sample was obtained by applying it to a micron thickness and drying it. At the same time, polymethyl methacrylate latex (average size 3.5 μm) was added to the gelatin aqueous solution and coated to a dry film thickness of 1 μm.
The amount of silver coated was 0.5 g/m ² . Image Receiving Sheet A polyethylene laminate paper having a 6 μm cellulose triacetate layer was immersed in an alkaline hydrolysis solution containing a silver precipitant for 1 minute to prepare an image receiving sheet for diffusion transfer. The alkaline hydrolyzate was prepared as follows. Dissolve 0.1 g of nickel nitrate in 2 ml of water, add to 100 ml of glycerin, and stir vigorously.
An additional 1 g of sodium sulfide dissolved in 2 ml of water was added to form a silver precipitant dispersion of nickel sulfide.
20 ml of this dispersion was added to 1000 ml of water-methyl alcohol (1/1) solution in which 80 g of sodium hydroxide was dissolved.
was added to prepare an alkaline hydrolysis solution containing a silver precipitant. Treatment liquid (A) Titanium dioxide 3g Hydroxyethylcellulose 79g Zinc oxide 9.75g Uracil 90g Triethanolamine 45% aqueous solution 17.14g Tetrahydropyrimidinethione 0.4g 2,4-dimercaptopyrimidine 0.35g 6-n Propylthiouracil 0.35g Treatment liquid ( Add the developers 1 to 7 above to A) as NN dimethoxyethyl hydroxylamine in a total amount of 75 g, and then add potassium hydroxide (40% aqueous solution) as free potassium hydroxide in a total amount of 323 ml. Add water to make a treatment solution of 2 kg. The processing liquid was spread between the photosensitive sheet and the image-receiving sheet, and then peeled off after 5 minutes had elapsed. The obtained images showed the same sensitivity, gradation, maximum density, and minimum density for all developers 1 to 7. Further, the obtained prints were left at room temperature for one week and the surface condition of the prints was observed.

[Table] Example 4 Image receiving sheet A solution of 18 g of cellulose acetate (degree of acetylation 54%) and 12 g of styrene-maleic anhydride copolymer dissolved in 270 ml of acetone and 30 ml of methanol was placed on polyethylene laminated paper at 54 ml/m ^{2 .} It was coated and dried to a thickness of . On top of this, 3,6-diphenyl-
1,4-dimercapto-3H,6H-2,3a,5,
A 0.598% cellulose acetate acetone solution of 6a-tetrazapentalene was applied to give a dry film thickness of 5 g/m ² . Furthermore, dimethylol urea (5%) aqueous solution and acetic acid (50%) were added to and mixed with a 5% aqueous solution of polyacrylamide at a concentration of 5% and 1.25%, respectively, and the mixture was coated at a coating thickness of 25 ml/m ² . Furthermore, on top of this, acetone/cellulose acetate
A liquid in which palladium sulfide was finely dispersed was applied to a methanol solution. This coating solution contains 1.25×10 ^-6 mol/
1-phenyl-5-mercaptoimidazole was contained in a coating amount of m ² . The dry film thickness is
It was 0.8 μm. This coated material was coated with the following alkaline solution at a rate of 18 ml/m ² , washed with water and dried to produce an image-receiving sheet. The above palladium sulfide dispersion was prepared by adding 7 x 10 ^-3 mol of sodium sulfide methanol solution and 7 x 10 ^-3 mol sodium palladium chloride methanol solution to a 5.3% acetone/methanol mixed solution of cellulose acetate and stirring well. I made it. The image-receiving sheet, the same photosensitive sheet as in Example 1, and the processing solutions (0) to (6) prepared in Example 3 were developed, and when peeled off after 5 minutes, the same processing solution (0) as in Example 3 was developed. ) to (6) have the same sensitivity, gradation, maximum density,
A minimum density was obtained, and results similar to those of Example 3 were obtained, although the surface condition of the resulting prints after storage for one week was slightly better than that of Example 3. From the above studies, by carrying out the method of the present invention, an active developer that can be stored for a long period of time can be provided, and the resulting prints can be stored for a long period of time.

Claims (1)

[Claims] 1. About 50 to about hydroxylamine from a composition containing a compound represented by the following general formula ()
A processing composition for silver salt diffusion transfer method, comprising as a developer a composition obtained by removing 98 mol% of dicarboxylic acid. In the formula, R ₁ represents an alkyl group or an alkoxyalkyl group, R ₂ represents hydrogen, an alkyl group, or an alkoxyalkyl group, and n represents an integer of 0 to 3.