JPH0695320A - Image accepting material used in silver salt diffusion transfer method - Google Patents

Abstract

PURPOSE: To provide an image receptive material for use in a silver salt diffu sion transfer method with which images having high quality, i.e., high density, sharpness and definition and having no or substantially no pinholes are formable and which may be stored without requiring an intermediate sheet between the two image receptive materials. CONSTITUTION: The image receptive material includes the image receptive layer contg. physical development nuclei and an upper layer without contg. the physical development nuclei thereon on a base. The solid coating amts. of both layers are 2.5g/m<2> at the most and the upper layer contains a matting agent having such solubility at which 0.2g matting agent is completely soluble in 10ml aq. soln. contg. 1mol/l sodium hydroxide at room temp. and within 10 seconds.

Description

Detailed Description of the Invention

This invention relates to image receiving materials suitable for use in silver complex diffusion transfer reversal processes.

The principle of the silver complex salt diffusion transfer inversion method (hereinafter referred to as the DTR method) is described, for example, in US-P 2352014 and The Focal Press 1972 in London and New York.
Published by Andre Rott and Edith Weyde, Photograph
ic Silver Halide Diffusion Processes.

Originally intended only for copying purposes in the office, the DTR method has now found wide application in the field of graphic arts, especially in the production of screen printing from continuous tone originals. In the above-mentioned manufacturing, the continuous tone information is converted into halftone information by using the graphic art exposure method. The essential requirements for screening are:
Continuous tone values of different sizes and different dot coverage% (%
(Also referred to as halftone dot value).

In order to meet the high quality requirements of screen copy in terms of screen halftone clarity and tone reproduction,
Measures to obtain top image acutance and neutral black image density must be paid to the image receiving material (hereinafter also referred to as positive material).

From a number of experiments carried out, the following factors have an influence on the image tone (A. Rott and E. Weyde, mentioned above):
(See page 58 of this book):

1. 1. The nature, number and concentration of development nuclei in the positive material. 2. The time that the positive and photosensitive materials remain in contact, 3. Properties of the binder in the image receiving layer, 4. The quality of the complexing agent present, and Presence of additives that affect image tone.

Most of the DTR positive materials currently available on the market consist of two or three layers. Such a material, on top of the usual nucleating layer, does not itself contain nucleating and otherwise has the same composition as the nucleating layer, and during transfer there is good contact between the negative and positive materials. It contains a layer whose main function is to ensure Further after drying, this layer provides a protective layer for the image receiving layer containing the silver image. It also prevents silver from protruding from the image-receiving layer in the form of a glossy silver mirror, thereby preventing ferroe burning in the black image area (see page 50 of the book).

The transfer behavior of complexed silver is highly dependent on the thickness of the image-receiving layer and the type of bond or mixture of binders used in the nucleus-containing layer. In order to obtain a sharp image with high spectral density, the reduction of the diffusing silver salt in the image-receiving layer must occur rapidly before lateral diffusion becomes substantial. Therefore, the thickness of the nuclei containing layer and the layers above it are kept to a minimum.

However, during storage and handling, these image receiving materials are easily damaged. This problem,
The solution is to put a paper sheet between the two image receiving sheets in the form of a package. The disadvantage of this is that it introduces additional paper waste and increases the cost of the package. Alternatively, a matting agent can be included in the top layer of the image-receiving layer to maintain a constant spacing between the two image-receiving materials of the package.

It is known to use as matting agents, for example, inorganic matting agents such as silica, or hydrophobic polymer particles such as polymethylmethacrylate particles. These matting agents cause an extreme reduction in image quality in many respects, such as reduced density, increased number of pinholes and the like.

JP-A-61-45243 and JP-A-61-
45244 describes the use of alkali soluble matting agents in image receiving materials for use in silver salt diffusion transfer processes. However, even the matting agents described therein have been found to be unsuitable for use in image-receiving materials having an image-receiving layer and an overlying thin layer package.

Furthermore, in order to keep the thickness of the image-receiving layer and the upper layer to contain the matting agent in the upper layer to a minimum, the disturbance of the image-receiving layer in the coating due to the penetration of the matting agent into the image-receiving layer. Give rise to. As a result, pinholes are created in the images obtained with such image-receiving materials, as nuclei are no longer present or depleted where the matting agent penetrates the image-receiving material.

The object of the present invention is to achieve high quality, ie high concentration,
For use in a silver salt diffusion transfer process that is sharp, resolving, capable of producing an image with little or no pinholes, and can be stored without the need for an intermediate sheet between two image receiving materials. The present invention is to provide an image receiving material.

Another object of the present invention is to provide a method for obtaining high quality images using an image receiving material having the properties described above.

Further objects of the present invention will be apparent from the following description.

According to the invention, the support comprises an image-receiving layer containing physical development nuclei and an upper layer without physical development nuclei thereon, the total solid coverage of both layers being at most 2. 5 g / m
² to provide an image-receiving material, the upper layer of which 0.2 g of matting agent can be completely dissolved within 10 seconds at room temperature in 10 ml of an aqueous solution containing 1 mol / l of sodium hydroxide. It is characterized by containing a matting agent having a high solubility.

According to the present invention, the step of imagewise exposing (A) an imaging element containing a silver halide emulsion layer,
(B) developing the image-forming material in the presence of a developing agent and a silver halide solvent while contacting the image-receiving material as described above, and (C) developing the image-forming material with the image-receiving material. Provided is a method for obtaining images comprising the steps of separating from each other.

It has been found that high density, virtually pinhole-free images can be obtained with the DTR method using the image-receiving material according to the invention. There is only a small reduction in image density for image receiving materials that do not contain a matting agent in the upper layer. Furthermore, the image-receiving element is particularly suitable for use in an alkaline processing bath containing an alkanolamine as the main component for providing alkalinity.

The matting agent to be used in the context of the present invention is preferably a copolymer of one or more hydrophobic monomers and one or more hydrophilic monomers containing acid groups. . Suitable hydrophobic monomers include, for example, (meth) acrylate esters such as methyl methacrylate, ethyl methacrylate, methyl acrylate, stearyl methacrylate,
Stearyl acrylate, buty (meth) acrylate,
Examples include styrene, vinyl chloride and vinylidene chloride. Preferred hydrophilic monomers are those having a carboxylic acid group such as methacrylic acid or acrylic acid.

The molar ratio of hydrophobic monomer to hydrophilic monomer in the copolymer is preferably between 1: 1 and 1: 3, and between 1: 1 and 1: 2. More preferably, 1: 1 to 4:
Most preferred is between 5. By increasing the content of the hydrophilic monomer in the copolymer, the dissolution rate of the matting agent in the alkaline treatment bath can be increased.

The volume average diameter (d _mv ) of the matting agent is preferably larger than the thickness of the upper layer. By volume average diameter is taken the median diameter, which means that 50% by volume of the matting agent has a diameter smaller than the median diameter. The volume average diameter is preferably 1.5 to 6 μm, and more preferably 1.8 to 3.8 μm. The best results in the context of the present invention are obtained when the size of the matting agent reaches a homogeneous distribution. Homogeneous distribution in the context of the present invention means that the ratio of the volume average diameter (d _mv ) to the number average diameter (d _mn ) is 1 to 1.1, more preferably 1 to 1.05. The number average diameter (d _mn ) is the median diameter which represents 50% by the number of matting agents having a diameter smaller than the median diameter.

The matting agent used in the context of the present invention can be prepared by the method described in DE-A 3331542.

The amount of matting agent included in the image receiving material in the context of the present invention is from 1 mg / m ^{2 to} 100 mg / m ^2.
2 is preferred and 4 mg / m ^{2 to} 40 mg / m ²
Is more preferable, and 8 mg / m ^{2 to} 20 mg / m ² is the most preferable.

The support of the image receiving material can be opaque or transparent and can be, for example, a paper support or a resin support.

The image-receiving layer contains physical development nuclei, usually in the presence of protective hydrophilic colloids such as gelatin and / or colloidal silica for best imaging results.

Preferred development nuclei include heavy metal sulfides such as antimony, bismuth, cadmium, cobalt, lead,
There are sulfides of nickel, palladium, platinum, silver and zinc. Particularly preferred development nuclei are NiS.AgS nuclei as described in US-P 4,563,410. Other suitable development nuclei include salts such as selenides, polyselenides, polysulfides, mercaptans and tin (II) halides. Heavy metals or salts thereof and fogged silver halide are likewise suitable. The lead and zinc sulfide complex salts are active alone and when mixed with thioacetamide, dithiobiuret and dithioxamide. Heavy metals, preferably silver, gold, platinum, palladium and mercury can be used in colloidal form.

The image receiving material is, for example, DE-P11243.
54, US-P4031471, US-P407252.
6 and published European patent application (EP-A) 00
Development nucleus thioether compounds such as those described in 26520 may be included in operative contact.

The transfer behavior of complexed silver is highly dependent on the type of binder or binder mixture used in the nuclei containing layer and the thickness of the image receiving layer. In order to obtain a sharp image with high spectral density, the reduction of silver salts diffusing into the image-receiving layer must occur rapidly before lateral diffusion becomes substantial. Therefore, the total solid content of the image receiving layer and the upper layer is preferably 2.5 g / m ² or less, and ² g / m ² or less.
Most preferably it is m ² or less.

The upper layer contained in the image receiving material according to the present invention contains a hydrophilic colloid. Total solids content of the upper layer is preferably ^{0.1g / m 2 ~1.5g / m 2} .

According to a preferred embodiment of the present invention, the image receiving material comprises, on a support, (1) an image receiving layer containing physical development nuclei dispersed in a water-permeable binder and (2) development nuclei. Not containing, but containing a water-permeable upper layer according to the invention containing a hydrophilic colloid, (i) the total solids content of said two layers (1) and (2) is at most 2 g / m ² . , (Ii) In the layer (1), the coating amount of the core is 0.1 to 10 mg /
m ² range, binder coverage 0.4-1.3 g
/ M ² range, (iii) in the upper layer (2),
The coating amount of the hydrophilic colloid is in the range of 0.1 to 0.9 g / m ² .

According to a particular example, the core-containing layer (1) is a hydrophilic subbing layer underneath the core which has a coverage of the hydrophilic colloid in the range from 0.1 to 1 g / m ² or The total solids coverage of layers (1) and (2) together with the subbing layer present on the subbing layer system is preferably at most 2.5 g / m ² .

The subbing layer is optionally mixed with a substance that improves the image quality, for example, a substance that improves the image tone or the whiteness of the image background. For example, the subbing layer can contain fluorescent materials, silver complexing agents, and / or development inhibitor releasing compounds to improve image sharpness.

According to a particular example, the image-receiving layer is applied on a subbing layer which acts as a timing layer in combination with an acidic layer which acts for the neutralization of the alkali of the image-receiving layer. The timing layer establishes the time before neutralization occurs by the time taken by the alkaline processing composition to penetrate through the timing layer. Suitable materials for the neutralization layer and timing layer are Research Disclosure, July 1974, it
em 12331 and July 1975, item 13525
It is described in.

Image-receiving layer (1) and / or said upper layer (2)
And / or it is preferred to use gelatin as hydrophilic colloid in the subbing layer. In layer (1) gelatin is preferably present in at least 60% by weight, optionally other hydrophilic colloids such as polyvinyl alcohol, cellulose derivatives, preferably carboxymethylcellulose,
Dextran, galactomannan, alginic acid derivative,
For example, it is used in combination with alginic acid sodium salt and / or water-soluble polyacrylamide. The other hydrophilic colloid can be used in the upper layer in an amount of at most 10% by weight, and can also be used in the subbing layer in an amount smaller than the gelatin content.

The image-receiving layer and / or the hydrophilic colloid layer having a water-permeable relationship therewith are a silver halide developing agent and / or
Or a silver halide solvent, eg about 0.1 per 1 m ^2.
Sodium thiosulfate can be included in an amount of g to about 4 g.

The image-receiving layer or the hydrophilic colloid layer having a water-permeable relationship therewith can contain colloidal silica.

At least one of the layers of the image receiving material of the present invention may contain a substance which plays a role in determining the tone of a diffusion transfer silver image. Substances imparting a neutral color tone are, for example, GB-A561875 and BE-A5025.
25, referred to as a black toning agent.

According to a preferred embodiment, the processing liquids and / or image-receiving materials detailed below contain at least one toning agent. In the above case, the image toning agent can be gradually transferred from the image receiving material by diffusing into the processing liquid, in which the concentration of the toning agent can be kept almost constant. Indeed, this can be achieved by using a silver image toning agents in a hydrophilic water-permeable colloid layer at a coverage in the range of ^{1mg / m 2 ~20mg / m 2} .

A survey of suitable toning agents can be found in Andre R
ott and Edit Weyde, pp. 61-65, preferred is 1-phenyl-1H-tetrazole-5-thiol (also called 1-phenyl-5-mercapto-tetrazole) and its tautomers. Properties and derivatives such as 1- (2,3-dimethylphenyl) -5-mercapto-tetrazole, 1- (3,4-dimethylcyclohexyl) -5-mercapto-tetrazole, 1- (4-
Methylphenyl) -5-mercapto-tetrazole, 1
-(3-chloro-4-methylphenyl) -5-mercapto-tetrazole, 1- (3,4-dichlorophenyl)
-5-mercapto-tetrazole. More particularly useful toning agents are those of the group of thiohydantoins or phenyl-substituted mercapto-tetrazoles.

Still another toning agent suitable for use in accordance with the preferred embodiment of the present invention is European Patent Application 21
8752, 208346, 218753 and US-P4.
There are toning agents described in 683189.

According to a practical example in an image receiving material, the backing on the side of the support opposite to the side carrying the development containing layer and / or the hydrophilic colloid layer or the image receiving layer in water permeable relationship. The coating layer contains at least a part of a silver image toning agent.
Such a method actually causes an automatic replenishment of the toning agent in the processing liquid. The same applies at least in part for the replenishment of the developing agent and the silver halide complexing agent.

When an optical brightener is used in the image-receiving element of the present invention, is it inherently diffusion resistant depending on its structure?
Alternatively, optical brighteners that are rendered diffusion resistant by use in the context of another substance when dissolved or adsorbed are preferred.

For example, in order to make the optical brightener resistant to diffusion, one of the following methods may be applied.

According to a first method known from color photography, optical brighteners are replaced with long-chain aliphatic and ionomer residues as is known in the synthesis of diffusion resistant couplers.

According to the second method, a lipophilic optical brightener is added to a water immiscible solvent, a so-called oil former,
For example, it is mixed in a small droplet of dibutyl phthalate.

According to a third method, an optical brightener is added to the polymeric hydrophilic colloid adsorbent, a so-called scavenger, eg US
-P3650752, US-P3666470 and US
-P3860427 and poly-N-vinylpyrrolidone as described in published European patent application 0106690.

According to the fourth method, the German published patent (D
E-OS) 1597467 and US-P4388403.
As described in (1), a latex composition containing an optical brightener loaded in latex particles, that is, in a dissolved and / or adsorbed state, is used.

The image receiving layer and / or the hydrophilic colloid layer of the image receiving material of the present invention may be cured to achieve enhanced mechanical strength. Suitable hardening agents for hardening the natural and / or synthetic hydrophilic colloid binders in the image receiving layer include, for example, formaldehyde, glyoxal, mucochloric acid, and chromium alum. Curing can also be carried out by incorporating a curing agent precursor into the image-receiving layer, the curing of the hydrophilic colloid therein being initiated by treatment with an alkaline processing liquid. Other curing agents suitable for curing the hydrophilic colloid binder in the image receiving layer include, for example, Research Disclosure 22057 (1983, 1).
Mon.) and vinyl sulfonyl hardeners as described.

The image-receiving element according to the invention can be used in the form of roll film or sheet film or in the form of film packs, for example for camera processing.

The image-receiving element of the present invention can be used in combination with any type of photographic silver halide emulsion material suitable for use in diffusion transfer reversal processing, wherein the silver halide is predominantly silver chloride. A silver emulsion layer is preferred,
This is because they complex with thiosulfate ion relatively easily. The silver halide grains can have any size or shape and can be prepared by any method known to those skilled in the art, for example by the single jet or double jet precipitation method. Negative or direct positive silver halide grains can be used. Negative and positive working silver halide emulsions are known to those skilled in the art, for example Research Disclosure, 1976.
No. 15162, November 2015.

The binder of the photographic silver halide emulsion layer in the photographic material is preferably gelatin. However, instead of or together with gelatin, one or more other natural and / or synthetic hydrophilic colloids such as albumin, casein,
Zein, polyvinyl alcohol, alginic acid or a salt thereof, cellulose derivative such as carboxymethyl cellulose, modified gelatin and the like can be used. The weight ratio of hydrophilic colloid to silver halide expressed as the equivalent of silver nitrate in the silver halide emulsion layer of the photosensitive material is usually 1: 1.
It is about 10: 1.

In addition to the binder and silver halide, the light-sensitive material may be incorporated in a photographic silver halide emulsion layer and / or one or more layers in water permeable relationship therewith for performing the DTR process. Can contain any type of compound commonly used in. Such layers may be, for example, one or more developing agents, coating aids, stabilizers or antifoggants such as GB-A100.
7020 and Research Disclosure 2423 described above
6, plasticizers, development influence imparting agents such as U
S-P2938792, US-P3021215, US
-P3038805, US-P3046134, US-
P4031471, US-P4072523, US-P
4072523, US-P 4072526, US-P4
292400 and DE-A 1124354 thioether compounds, onium compounds and polyoxyalkylene compounds, for example DE-A 2749926.
0, DE-A1808685, DE-A2348194
And Research Disclosure 22507 (1983, 1
May include hardeners such as those described in US Pat.

If developing agents are to be incorporated into the silver halide emulsion, they are added to the emulsion composition, preferably after the emulsion rinsing, followed by a chemical ripening step.

The silver complex salt diffusion transfer reversal process is essentially the development of exposed silver halide in the emulsion layer of the light-sensitive material, the complexation of residual undeveloped silver halide, and the formation of silver complex salt in the image receiving material. Diffusion transfer, and wet processing that causes physical development therein.

The treatment proceeds in an alkaline aqueous medium.

The developing agent or mixture of developing agents can be incorporated into a light-sensitive material containing an alkaline processing solution and / or a photographic silver halide emulsion layer. When incorporated in the light-sensitive material, the developing agent can be present in the silver halide emulsion layer, or preferably in the hydrophilic colloid layer in water-permeable relationship therewith, such as the halogenation of the light-sensitive material. It is present in the antihalation layer adjacent to the silver emulsion layer. When a developing agent or a mixture of developing agents is contained in the photosensitive material, the processing solution is simply an alkaline aqueous solution that initiates and activates development.

Suitable developing agents for the exposed silver halide are, for example, hydroquinone-based and 1-phenyl-
There are 3-pyrazolidone developing agents and p-monomethylaminophenol.

The silver halide solvent, preferably sodium thiosulfate, can be provided from a light-insensitive image receiving material as described above, but it is usually at least partially pre-existing in the alkaline processing solution. When present in the alkaline processing solution, the amount of silver halide solvent is, for example, 10 g / l to
It is in the range of 50 g / l.

The alkaline processing solutions are usually alkaline substances, preservatives such as sodium sulfite, thickeners such as hydroxyethyl cellulose and carboxymethyl cellulose, antifoggants such as potassium bromide, silver halide solvents such as sodium or potassium thiosulfate, black toning. Agents, especially heterocyclic mercapto compounds. The pH of the treatment solution is preferably in the range of 10-14.

Preferred alkaline substances are inorganic alkalis such as sodium hydroxide, potassium carbonate or alkanolamines or mixtures thereof. Alkanolamines preferably used are EP-A397925, EP.
-A397926, EP-A397927, EP-A3
Tertiary alkanolamines such as those described in 98435 and US Pat. No. 4,632,896. Both are 9
Combinations of alkanolamines having a pKa above and a pKa below 9 or combinations of alkanolamines having a pKa above at least 9 and another pKa of 9 or less are also disclosed in JP-A-61-73949. 61-7395
3, 61-169841, 60-212670, 61-
73950, 61-73952, 61-102644,
63-226647, 63-229453, US-P4.
It can be used as described in 362811, US-P 4,568,634 and the like. The concentration of these alkanolamines is preferably 0.1 mol / l to 0.9 mol / l.

For details of the exposure and development apparatus that can be used in the DTR method according to the present invention, refer to, for example, the above-mentioned book by A. Rott and E. Weyde and the patent documents cited therein.

The image-receiving element according to the invention is particularly suitable for producing line drawings and screen images. They can likewise be used for the production of identification by the DTR method. Such an identification card contains identification data and / or a photograph formed by diffusion transfer in an image-receiving layer on a water-impermeable resin support, such as a polyvinyl chloride resin support or a polyethylene-coated paper support, Is identification data and /
Or laminated to a transparent protective cover sheet to eliminate counterfeiting due to photo alteration. The transparent protective cover sheet is usually a thermoplastic resin sheet, such as a polyester film sheet, for example a polyethylene terephthalate film sheet, which is coated with polyethylene on the side to be laminated to the image receiving layer carrying the identification data.

The present invention is illustrated by the following examples, but the invention is not limited thereto. All percentages are weight percentages unless otherwise stated.

Example Preparation of matting agent

The following reaction mixture acts as a receiver 1
It was introduced into a 5 l container and stirred constantly:

1: Methanol shown in Table 1 below, 2: Amount of electrolyte-free water corresponding to the amount obtained by subtracting the amount of methanol from 6 Kg, 3: Styrene and maleic anhydride having an intrinsic viscosity of 0.574 dl / g 450 g of an aqueous solution containing 10% of the sodium salt of the alternating copolymer of (see Table 1), 4: the amount of n-lauryl mercaptan as shown in Table 1, 5: 450 g of electrolyte-free water, 6: 1,500 g of the monomer mixture shown, 7: the amount of potassium persulfate shown in Table 1, 8: 2% by weight based on the total amount of monomers of the polyethylene oxide wetting agent (Hostapal W obtained from Hoechst), 9: alkanesulfonic acid Sodium Wetting Agent (Bayer A
2% by weight, based on the total amount of monomers of Mersolat H) obtained from G.

2250 g of the above mixture were initially introduced into a 12 l steel autoclave equipped with a blade stirrer. Then close the autoclave to a low nitrogen overpressure, 65 ° C
Heated to the temperature of. After a reaction time of 30 minutes, the remaining reaction mixture was metered from the receiver into the autoclave over 2 hours by means of a reciprocating pump. After completion of pumping, the mixture was stirred for an additional 3 hours at 75 ° C. at a speed of 100 rpm. The suspension formed was cooled to room temperature.

[0068]

[Table 1]

I = Natri salt of alternating copolymer of styrene and maleic anhydride MA = methacrylic acid MMA = methyl methacrylate STM = stearyl methacrylate LSH = lauryl mercaptan A / B = molar ratio of MMA + STM to MA% M = monomer Weight% based on the total amount of body (MA + MMA + STM).

Production of Image Receiving Material

A polyethylene terephthalate film support (provided with a hydrophilic adhesive layer) was coated on both sides with an image receiving layer containing silver nickel sulfide nuclei and gelatin at a dry coverage of 2.0 g / m ² . This layer was applied by slide hopper coating, so that the nuclei were in the bottom coating of 1.3 g gelatin for 1 m ² . The upper layer was provided from the coating solution described below such that the amount of gelatin in the upper layer corresponded to 0.7 g gelatin per 1 m ² .

Coating solution for the upper layer: (1) 1% 7% of the matting agent prepared as described above (except for the control sample containing no matting agent), 7% gelatin, 7% methanol. Aqueous dispersion 17 g / l, (2) Gelatin 50 g / l.

The image receiving material was hardened with formaldehyde, the formaldehyde being 0.02 mg / in the image receiving material.
It was included in an amount of m ² .

Production of imaging materials

On a polyethylene terephthalate film support (provided with a hydrophilic adhesive layer) carbon black in an amount such that the optical density for visible light was 0.6 and gelatin in an amount of 3.9 g / m ^2. Was coated with an antihalation layer. In this layer, a gelatin silver chlorobromide emulsion spectrally sensitized with an ortho sensitizer (silver chloride 98.2
Mol% and silver bromide 1.8 mol%) with a coverage of 2.5 g / m ² of silver halide expressed as AgNO ₃ .
The weight ratio of gelatin to silver halide, expressed as AgNO ₃ , was 1.2. The silver halide emulsion layer further hydroquinone and 1-phenyl-4-methyl - pyrazolidone respectively 0.9 g / m ² and 0.25 g / m ²
Was included in the coating amount. The silver halide layer was then coated with a gelatin layer containing 0.5 g / m ² gelatin.

Composition of treatment liquid: Hydroxyethyl cellulose 1 g EDTA 2 g Na ₂ SO ₃ (anhydrous) 45 g Na ₂ S ₂ O ₃ (anhydrous) 14 g KBr 0.5 g 1-phenyl-5-mercapto-tetrazole 0.08 g 1- ( 3,4-Dichlorophenyl) -1H-tetrazole-5-thiol 0.04 g DMEA 30 ml MDEA 35 ml Water was made up to 1 liter.

EDTA = ethylenediaminetetraacetic acid tetrasodium salt DMEA = dimethylethanolamine MDEA = methyldiethanolamine

Image Forming Method: Each of the image receiving materials shown in Table 2 is brought into contact with an image forming material which has been exposed according to an image as described above, and a transfer processor Copyproof using the processing liquid described above.
Treated with CP380 (commercially available from Agfa-Gevaert NV). For processing, the transfer contact time was 60 seconds and a temperature of 22 ° C was used. Image-wise exposure of the imaging element was carried out after the support.

Evaluation The maximum transmission density of each of the images obtained was measured and the difference in the measured density from the measured density of the control sample containing no matting agent was calculated.

The tackiness of each of the receiving materials is determined by the relative humidity of 80
%, At 35 ° C. for 5 days, the two sheets (A4 size) were placed under a weight of 2 kg and evaluated. Next, they are peeled off, the tackiness is measured, and 0 to show the degree of tackiness.
A number of 10 was assigned (higher numbers indicate an increased degree of tackiness, ie a value of 5 indicates an already unacceptable degree).

The number of pinholes was visually evaluated by holding the image receiving material against light with a magnifying glass. A number from 0 to 10 was added to indicate the degree of pinholes (a large number indicates a high degree of pinholes).

Table 2 below shows the results obtained for each of the receiving materials containing a matting agent as indicated:

[0083]

[Table 2]

Solubility = (+) means that 0.2 g of the matting agent
Indicating that it could be dissolved within 10 seconds at room temperature in 10 ml of an aqueous solution containing 1 mol / l sodium hydroxide,
(−) Indicates that it could not be dissolved.

D _mn = average diameter based on fractional fraction (Coulte
r Measured with Multisizer).

D _mv = average diameter based on volume fraction (Coul
ter Multisizer).

Adhesiveness = degree of adhesion.

Pinhole = degree of pinhole.

ΔD _max = D _max of sample to D of control sample
_The difference minus _max .

From Table 2 above it can be seen that all image-receiving elements containing a matting agent show the highest density loss relative to the control image-receiving material containing no matting agent. However, the image-receiving element according to the invention shows a small reduction in maximum density. Furthermore, it can be seen that the image receiving material according to the present invention has no or almost no pinholes.

Front Page Continuation (72) Inventor Daniel Timmermann Septerrato, Mortzel, Belgium 27 Agfa Gewert Namrose Rose Bennault Chap

Claims (8)

[Claims] 1. A support comprising an image-receiving layer containing physical development nuclei and an upper layer containing no physical development nuclei thereon,
In an image-receiving material in which the total solids coverage of both layers is at most 2.5 g / m ² , the upper layer comprises 0.2 g of matting agent
10 m aqueous solution containing mol / l sodium hydroxide
1. An image receiving material containing a matting agent having a solubility such that it can be completely dissolved within 10 seconds at room temperature. 2. The matting agent is a copolymer of a hydrophilic monomer containing one or more acid groups and one or more hydrophobic monomers, wherein the matting agent is a copolymer. Image receiving material. 3. The image receiving material according to claim 2, wherein the molar ratio of the hydrophobic monomer to the hydrophilic monomer in the copolymer is between 1: 1 and 1: 2. . 4. The image receiving material according to claim 1, wherein the matting agent has an average diameter based on a volume fraction that is greater than the thickness of the upper layer. 5. The average diameter based on volume fraction is 1.
The image receiving material according to claim 4, wherein the image receiving material is between 8 μm and 3.8 μm. 6. The image receiving material according to claim 1, wherein the total solid coating amount of the image receiving layer and the upper layer is 2 g / m ² or less. 7. The ratio of the average diameter based on the volume fraction to the average diameter based on the number fraction is between 1.0 and 1.1. The image receiving material according to item 1. 8. An image-wise exposure of an image-forming material containing (A) a silver halide emulsion layer, (B) said image-forming material in the presence of a developing agent and a silver halide solvent. 7. A method for obtaining an image, comprising: developing while in contact with the image receiving material of any one of 7), and (C) separating the image forming material from the image receiving material. .