DE1168768B - Photographic material and process for the formation of multicolor images by a diffusion transfer process using dye developing agents - Google Patents

Description

Photographic material and process for the manufacture of multicolor Images by a diffusion transfer process using dye developing agents The invention relates to a photographic material and a method for the production of multicolored images by a diffusion transfer process and development and copying processes suitable for this purpose.

The invention relates to improvements in detail a dye developer diffusion transfer process used for producing positive, multicolor images of the type described in a number of patents and for example, in British Patent 804,971. In this process, photographic materials which have one or more silver halide emulsion layers and a corresponding number of layers which contain diffusible dye developing agents, i.e. compounds which contain the chromophoric system of a dye and the developing principle of a silver halide developing agent, are exposed to the light taking up latent image in the silver halide, and then treating with an alkaline solution which permeates the emulsion layers and the layers containing dye developing agents, the latent images being developed into silver images. At the same time, oxidation products of the dye developer in question are formed at practically the same place as the silver images which are fixed in the colloidal binder of the layers, ie are relatively non-diffusing. The fixing of the oxidized dye developer is obviously at least partly due to a decrease in solubility in the alkaline developer liquid and may also be due to a hardening or tanning effect of the oxidized dye developer on the colloidal binders of the layers, which delays the diffusion of the oxidized dye developer. The residual, non-oxidized dye-developing substance remaining in the layers in an imagewise distribution is transferred by diffusion to an image-receiving material superimposed on the photosensitive material, essentially excluding the silver image and the oxidized dye-developing substance, whereby a positive color image is obtained.

When a photographic material is used, it differs contains sensitized silver halide emulsion layers, and when subtractively colored Dye developing agents in the corresponding emulsion layers or adjacent are present for the corresponding emulsion layers, the dye-developing substances when treated with the developer fluid, oxidized and in the developed areas of the layers and the dye developer images remaining in the positive areas are properly fitted or contoured on the image receiving material by diffusion transferred to form a multicolored reproduction.

Obviously, the success of this procedure depends in part on that The extent to which the color developer substances in the exposed (negative) Areas of the emulsion layers during the development reaction have been established.

Therefore, if unoxidized dye developing agent remains in a fully exposed, negative area, which corresponds to the high or acute highlights of the recorded image object, this will be transferred to the image receiving layer together with the unreacted dye developing agent in the positive areas and appears as a high minimum density on the formed color copy. Characteristic dye developer substances such as 1,4-bis [beta- (2,5-dioxyphenyl) ethylamino] anthraquinone are relatively weak silver halide developers, even if they are used at a relatively high px of the order of 13, as required for the process; they do not develop a silver halide emulsion quickly enough to be able to take full advantage of the known sensitivity properties of the emulsions and to obtain color images which have the full range of density and contrast to be expected when using other developers. As a result, colored copies obtained by this known method can have an undesirably high minimum density in the high-highlight areas, as well as low color saturation, low contrast and low density, and "color separation" is poor. These effects are due in part to the poor effectiveness of the dye developers in developing silver halide, the lack of "discriminatory power" of the dye developers as to the silver halide they were supposed to develop, and other factors.

For example, the cited British patent and others below cited patents refer to various features of the basic, diffusion transfer methods using the dye developing agents. This describes how monochromatic color images using dye developers are described delivering monochrome processes are carried out, and that the monochrome processes underlying principles of the subject invention for multicolor reproduction are applicable. It has been found that when appropriate for multicolor reproduction or it uses adapted photosensitive materials for the process containing a variety of differently sensitized silver halide emulsion layers and adjacent dye developer for subtractive color reproduction, the problems that arise are quite different from those of the monochrome process differentiate. For example, the development products of an emulsion tend to to cause the development of the other emulsions, further the diffusion of a Affects dye developer from a lower layer, for example are prevented by a dye developing agent or another Substance in an upper or overlying layer. Also, if necessary occurring exhaustion of the developer solution by an outer layer the development affect a lower layer, and there can be a layer not to the extent develop like another layer, and especially a dye developing agent cannot be determined sufficiently to prevent them from being applied to a color image of another color is transferred and contaminates the latter. Also can be a specific Dye developing agent some silver halide grains from a false emulsion layer develop with the result that an insufficient amount of that dye developing agent is available for transmission and the corresponding colors are not saturated are. Thus, a purple dye developing agent can make some of the red-sensitive ones Silver halide grains develop and become fixed in the process, thus increasing the quantity of the purple dye available to produce the red colors is reduced and the red colors appear unsaturated. As a result of undesirable development the red light-sensitive emulsion layer by the purple dye developing agent in addition, some of the cyan dye developing agent remains on the side, the actually the red light-sensitive emulsion layer should have developed freely for the diffusion, which results in an even greater unsaturation of the red colors.

The invention is based on the object of providing a light-sensitive, create multilayered photographic material and develop processes avoid the above disadvantages, in particular those with the use of the known Multi-color systems linked influence or dependency of the different layers, Color developing agents and other components on top of or from each other should be overcome or compensated, thereby obtaining multicolored reproductions that show a higher quality than previously thought possible became.

It has been found that a multilayer photosensitive element which gives highly satisfactory results is one in which, as shown in Fig. I of the drawings, the subtractively colored dye developing agents are dispersed in gelatin layers each underlying the corresponding gelatin-silver halide emulsion layers, and when the green-sensitive emulsion layer and its adjacent dye developing agent layer are separated from the other layers by gelatin interlayers which have a certain thickness and a certain gelatin content with respect to the yellow dye developing agent layer. This means. the intermediate layers should be at least about 750 /, the measured thickness of the yellow dye developer layer, and they should contain at least about twice as much gelatin as is present in the yellow dye developer layer, in order to prevent undue migration of the dye developer and the development products from layer to layer . This requirement is based on the fact that when a color copy is formed on an image-receiving layer, the dye-developing agent must diffuse away from the support in order to develop the corresponding emulsion layer, and that the dye-developing agent which is not fixed in the area of development continues towards the image-receiving sheet to diffuse. However, the yellow dye and the magenta dye developing agents can of course diffuse downwards towards the support and in this way develop part of the underlying emulsion layers, with the undesirable result that the maximum densities of certain colors of the copy are reduced and that some color falloff and some paint contamination occurs. These disadvantages are overcome by providing gelatin interlayers of a thickness which is at least about 75%, for example 75 to about 3000 / o, the thickness of the yellow dye developer substance layer, these interlayers being at least about twice as much, for example two to six times as much Contain gelatin as contained in the yellow dye developing agent layer. It is apparent that the thickness of the yellow dye developer layer is determined in part by the amount of gelatin and in part by the amount of dye developer present, since the former occupies a significant volume and is present in a substantial amount. If gelatin intermediate layers are used and certain hydroquinone derivatives are also present in one or more layers of the light-sensitive material, particularly favorable results are additionally obtained. These hydroquinone derivatives and the methods of using them are described in more detail below. Moreover, it is advantageous to process or develop the light-sensitive materials containing the intermediate layers in the presence of certain onium compounds described below, which onium compounds also reduce color contamination and improve color saturation, density and contrast.

The "color contamination" usually manifests itself in the copies as Degradation of one or more colors by one or more other colors and can be due to the failure of one or more color developing agents, To be sufficiently determined to avoid these from areas where they are should be determined. The »color drop« manifests itself as degradation the color quality of the copies and is evident from a dye developing agent conditionally developing silver halide grains in the wrong emulsion layer; for example, the purple dye developing agent develops some red-sensitive ones Silver halide grains, causing more of the magenta dye developing agent is set as should be set, and the red colors therefore of the purple dye lack, d. H. are less saturated.

The object underlying the invention is therefore in the manner solved that the green-sensitive emulsion layer of the light-sensitive material and their adjacent magenta dye developing agent from the other emulsion layers and their adjacent dye developing agents through gelatin interlayers are separated, each at least about 75% the thickness of the yellow dye developer containing layer, and each at least about twice as much gelatin like the layer containing the yellow dye developing agent. With the Invention, photosensitive materials are provided that sensitized differently Gelatin emulsion layers and preferably subtractively colored layers underneath Having gelatin dye developer layers, each of the emulsion layers as well as its adjacent dye developing agent layer from the other layers is separated by a gelatin intermediate layer of certain character, so that a impermissible diffusion from layer to layer is prevented. With the invention are also means for processing or developing the exposed photosensitive Materials provided, including developer fluids and image receiving layers, which are suitable for being composed of the dye developer substances Make copies either in a camera or in a separate facility.

The exemplary photosensitive ones described below Materials contain red-, green- and blue light-sensitive gelatin-silver halide emulsion layers and to the corresponding emulsion layer in each case adjoining subtractively colored, d. H. blue green-, purple and yellow colored gelatin dye developer layers, where the respective dye developer substance layer is in each case under the associated Emulsion layer is located and where the green-sensitive emulsion layer and its adjacent magenta dye developer layer from each of the other emulsion layers and their adjacent dye developing agent layers through a gelatin layer is separated, each at least 75% of the thickness of the yellow dye = developer substance layer and each containing at least about twice as much gelatin as in the yellow dye developing agent layer is contained. It preferably contains at least one layer of the photosensitive material is a hydroquinone derivative of certain properties; and it becomes the exposed photosensitive element processed in such a way that it comes into contact with the alkaline developing solution is moistened with .the image receiving layer of the image receiving material, wherein in particular certain onium compounds are present around the exposed silver halide to develop in the emulsion layers and the dye developing agents of the same thereby to be determined in the development areas, d. H. essentially non-diffusing to make what the dye developers in the unexposed areas by diffusion on the image receiving layer in an image-wise manner and with a correct fit or with the correct contour can be transferred to have a multicolor dye developer image thereon result.

The drawings show greatly enlarged cross-sections of exemplary Materials used in a typical process according to the invention.

1 shows in flow diagram form a typical process embodying the invention in which the photosensitive element of step 1 on a support 10, layers 11, 12 and 13, the dispersions of subtractively colored, alkali-soluble blues, cyan, magenta, and yellow dye developing agents, light sensitive silver halide emulsion layers 14, 15 and 16 which are sensitive to red, green and blue light, respectively, intermediate layers 17 and 18 which separate the green sensitive emulsion and its adjacent subtractively colored purple dye developing agent layer from the other layers, and a hydroquinone derivative containing Has cover layer 19. The image-receiving material, which has an image-receiving layer 21 (which may contain the onium salt) on a support 20, is arranged to receive dye images which are transferred by diffusion from the photosensitive material, with a breakable container with the alkaline pyridinium salt developing solution 22 between the image-receiving material and the photosensitive material. When the container 22 is broken such as by passing the array between rollers in a camera so that its contents are uniformly distributed over a predetermined area of the photosensitive material, the solution penetrates the layer 19, dissolving the water-insoluble, alkali-soluble and diffusible hydroquinone derivative and transports it to the underlying layers where the latent images in the silver halide of areas 23, 24 and 25 are developed to silver and the dye developing agent in the areas adjacent to areas 23, 24 and 25 are rendered non-diffusible or fixed. The dye developer substances of layers 11, 12 and 13 that have not reacted then diffuse imagewise and with the correct contours onto image-receiving layer 21 and form the corresponding dye images thereon. The preparation of the light-sensitive material and its use for the methods of the invention are described below.

Fig. 2 of the drawings shows a schematic representation for processing an exposed roll of film, the film of which contains the silver halide emulsions and the dye developer contains, usable, opaque housing, wherein the film in question is moistened with the alkaline activator solution and with a pickled image receiving sheet for the transfer of several multicolored Dye developer images on the sheet is brought into contact.

It has already been stated that it is advantageous to use certain hydroquinone derivatives incorporated into one or more layers of the photosensitive materials.

The hydroquinones that possess the required properties are essentially colorless and essentially insoluble in water as well as in alkaline Solution soluble and diffusible through gelatin layers. examples for this are the following: phenylhydroquinone, 2'-oxyphenylhydroquinone, phenoxyhydroquinone, 4'-methylphenylhydroquinone, 1,4-dioxynaphthalene, 2- (4-aminophenethyl) -5-bromohydroquinone, 2- (4-aminophenethyl) -5-methylhydroquinone, 4'-aminophenethylhydroquinone, 2,5-dimethoxyhydroquinone, 2,5-dibutoxyhydroquinone, m-xylohydroquinone, bromohydroquinone, 3,6-dichlorohydroquinone, 2-dimethylaminomethyltoluhydroquinone, 2-Cyclohexylhydroquinone, sec.Butylhydroquinone, 2,5-Dichlorhydroquinone, 2,5-Diisopropylhydroquinone, 2,5-diiodohydroquinone, 3-chlorotoluhydroquinone, tetrachlorohydroquinone, 2,5-diphenylhydroquinone, 2,5-diresorcylhydroquinone, 2,5-dioctylhydroquinone and dodecylhydroquinone.

It has already been mentioned that the intermediate gelatin layers and preferably the photosensitive materials containing hydroquinones is appropriate in the presence of onium compounds, including quaternary ammonium, ternary sulfonium and quaternary phosphonium compounds are processed or developed can.

Onium compounds have been used in photographic art for some time. For example, U.S. Patent 2,648,604 discloses the use of non-surface-active quaternary ammonium compounds as development accelerators and U.S. Patents 2,271,622, 2,271,623 and 2,275,727 use quaternary ammonium, quaternary phosphonium and tertiary sulfonium compounds as sensitizers for silver halide emulsions. Notwithstanding the fact that such onium compounds have been used as development accelerators and sensitizers, the results obtained by using onium compounds in combination with the dye developing agents in the diffusion transfer process of the present invention are remarkable.

The following example is intended to illustrate the invention in more detail. A photosensitive material of the structure shown in step 1 of FIG. 1 was produced by coating a film support 10 with the following hardened gelatin layers: An aqueous gelatin solution containing the cyan dye developer 5,8-dihydroxy-1,4- bis - [(ß-hydroquinonyl-a-methyl) -äthylamino] -anthraquinone, dissolved in a mixture consisting of Nn-butylacetanilide, 4-methylcyclohexanone and the sodium salt of an alkylnaphthalenesulfonic acid as a dispersant, was passed several times through a colloid mill and then applied to the film support and dried, the 4-methylcyclohexanone volatilized. This layer 11 then contained about 2260 mg of dye developer substance and about 2690 mg of gelatin per square meter.

On layer 11 , with the inclusion of developer layers 12, 13 and intermediate layers 17, 18, three gelatin silver bromide iodide emulsion layers 14, 15, 16 were applied, which were sensitized to the red, green and blue areas of the spectrum and which were about 2,150 per square meter , 750 and 430 mg of gelatin, respectively.

The gelatin interlayers 17, 18 are shown in the following table 11 described in more detail.

The dye developer layer applied to the intermediate layer 17 12 was prepared as follows: An aqueous gelatin solution containing the magenta dye developer 2- [p- (2 ', 5'-Dihydroxyphenäthyl) -phenylazo] -4-n-propoxy-l-naphthol, dissolved in a Mixture, consisting of cyclohexanone, N-n-butylacetanilide and the sodium salt of an alkylnaphthalenesulfonic acid, was passed through a colloid mill several times and then applied to layer 17 and dried, whereby the cyclohexanone evaporated. The layer contained per square meter about 800 mg gelatin.

The emulsion layer B was prepared as follows: An aqueous gelatin solution, which develops the yellow dye 1-phenyl-3-N-n-hexylcarboxamido-4- [p- (2 ', 5' - dihydroxyphenäthyl) - phenylazo] - 5 - pyrazolone, dissolved in a mixture, consisting from adipic acid di-tetrahydrofurfuryl ester, ethylene glycol monobenzyl ether and the sodium salt an alkylnaphthalenesulfonic acid, was passed through a colloid mill several times given. The resulting dispersion was then quenched and washed, to remove the ethylene glycol monobenzyl ether. Then layer 18 was applied applied and dried. The layer contained about 800 mg of dye developer and about 538 mg of gelatin per square meter.

The coated on the emulsion layer 16 hydroquinone derivative layer 19 was prepared as follows A dispersion consisting of 136 g of 4'-methylphenylhydroquinone, 136 ml of methyl alcohol and 272 ml of di-n-butyl phthalate, was, after having first heated to 70 ° C and then at 40 ° C was cooled, slowly to a solution heated to 40 ° C, consisting of 1360 g of 10% gelatin solution, 1360 ml of water and 136 ml of a 5% aqueous solution of the sodium salt of an alkylnaphthalenesulfonic acid, added, with mechanical stirring. The resulting solution was then passed through a laboratory colloid mill five times. The colloid mill was rinsed and the dispersion brought to a weight of 3775 g. The dispersion was then allowed to cool and placed in a refrigerator.

The dispersion was then diluted with 2225 ml of water before application and heated to 40 ° C.

A batch consisting of 3180 g of a 10% gelatin solution with 2000 ml of water and 515 ml of a 2.7% aqueous solution of mucochloric acid, which is heated to 40 ° C. and its pH value, was then added to the diluted dispersion was set to 5.5 .

It was finally diluted to 22.71 with water. The resulting solution was then applied as layer 19 . The layer contained approximately 1290 mg of gelatin and 430 mg of 4'-methylphenylhydroquinone, hereinafter referred to as "MPHQ" for short.

To show the effect of gelatin layers 17, 18 of different thickness; various films of the structure described were produced, the gelatin content of the layer 17 firstly 800 mg, secondly 1600 mg and thirdly about 2150 mg per square meter, the gelatin content of the layer 18 firstly 800 mg, secondly 1600 mg and thirdly about 3200 mg per square meter. These films are designated A, B and C in Table II below. Comparative films that did not contain "MPHQ" in layer 19 are labeled D, E and F. The measured thicknesses of layers 11 to 19 of films A, B and C are given in Table I. Table 1 Shift no. and layer thicknesses in centimeters 19 I 16 I 13 I 18 15 I 12 17 I 14 I 11 Film A ........ . 0.177 0.152 0.101 0.025 0.177 0.127 0.050 0.330 0.684 Film B ......... 0.152 0.177 0.101 0.076 0.177 0.152 0.101 0.355 0.609 Film C ......... 0.152 1 0.177 0.101 0.101 0.177 0.152 0.177 0.381 0.609 The table shows that the intermediate layers 17 and 18 of the films B and C were at least 75% of the thickness of the yellow dye developer layer 13. Cross-sections of these films at a magnification of about 1500 times showed that layers 12 and 15 of film A almost touched layers 14 and 13, respectively, whereas layers 12 and 15 in films B and C clearly differed from layers 14 and 13 , as shown in stage 1 of Fig. 1, lifted off.

Samples of the films were exposed to red, green and blue light using a step wedge and either an activator I (experiments 1 to 6) or an activator II (experiments 7 to 18) in contact with recording sheets A or B were moistened. This developed the silver halide in exposed areas 23, 24 and 25 of each film and set the dye developing agent in the adjacent areas of layers 13, 12 and 11 as a result of development. The unreacted dye developing agents diffused image-wise onto the image-receiving sheet, whereby, as shown in step 2 of FIG. 1, a colored positive image consisting of the image parts 26, 27 and 28 was formed. It was found that when using intermediate layers. of suitable strength, and particularly when picolinium salts were used and when 4'-methylphenylhydroquinone was present in the film, the dye developers were set in the correct layers 11, 12 and 13 at the speed and extent required.

The activator solutions used had the following composition: activator I aqueous, 3.5% high viscosity oxyethylcellulose, 4.50%, NaOH, 20%, benzotriazole, 2.00%, 1-benzyl-2-picolinium bromide and 10/0 sodium thiosulphate containing solution.

Activator 11 Aqueous solution containing 3.5 ° (o high viscosity oxyethyl cellulose, 4.5 "" N-OH, 2 ° / o benzotriazole and 10 % sodium thiosulphate.

Image-receiving sheet A consisted of a white pigmented cellulose ester support with a gelatin layer containing a mixture of poly (4-vinylpyridine) mordants and 1-phenyl-5-mercaptotetrazole.

Receiving sheet B differed from sheet A in that it was additionally 1-phenethyl-2-picolinium bromide contained.

Density measurements on the resulting neutral and red scales of the copies through red, green and blue filters gave the values compiled in Table 11: Table 11 Shift 18 Shift 17 red scale, On- i neutral scale density ratio of the such film acti- ahme gela- strength @ ela- strength @mrn blue green- to No vator sheet tine tine first stage puipur red density mg / m2 cm mg / m2 cm RIG BR GB 1 D 1 A 800 800 0.34 0.23 i0.33 0.78 1.27! 1.67 1: 1.63 no MPHQ i 2 E 1 A 1600 1600 0.35 0.27 0.49 0.67 1.34 1.81 1: 2.0 no MPHQ 3 F 1 A 2150 3200 1 0.28 0.25 0.40 0.56 d, 1.43 1 1.85 1: 2.56 no MPHQ 4 A 1 A 800 1 0.025 800 0.050 0.26 0.24 0.26 0.60 1 03 1.59 1: 1, 73 no MPHQ 5 B 1 A 1600 0.076 1600 0.101 0.22 0.22 # 0.24 0.39 I 1.12 1.74 1: 2.89 no MPHQ 6 C 1 A 2150I 0.101 3200 0.177 0.20 0.21 '0.25 0.23i 1.26 1.72 1: 5.5 no MPHQ 7 D A 11 800 800 0.22 0.87 10.55 0.75 1, 55 i 1.85 1: 2.08 no MPHQ 8 E 11 A 1600 1 1600 0.20! 0.54 10.94 0.70 1.61 1.93 1: 2.32 no MPHQ 9 F 11 A 2150 3200 0.14 (0.51i 1.08 0.64 1.70 1.91 1: 2.68 no MPHQ 10 A 11 A 800 800 0.18 0.30i 0.41 0.40 1.17 1.56 1: 2.94 with MPHQ 11 B 11 A 1600 16001 0.15 0.30 10.43 0.34 1.29 1.73 1: 3.82 with MPHQ 12 C 11 A 2150 3200 0.14 0.27 I0.42 0.30 1.48 1.88 1: 4.95 with MPHQ 13 D 11 B 800 800, 0.27 0.39 I0.60 0.79 1.41 1.79 1: 1.79 no MPHQ 14 E 11 B 1600 1600 0.27 0.40 0.66 0.71 11.4 :) 1.87 1: 2.04 no MPHQ I 15 F 11 B 2 1 50! 3200 0.24 0.41 0.76 0.61 1 1 60 1.92 1: 2.64 no MPHQ 16 A 11 B 800i 800 0.20 0.22 0.28 0.49 1.06I 1.57 1: 2.17 with MPHQ 17 B 11 B 1600 1600 0.16 0.19 0.28 0.29i 1.15 # 1.71 1: 4.00 with MPHQ 18 C 1 B 1 21501i 3200 0.20 0,2310,3 1 0.26 1.36 1, 86 1: 5.25 with MPHQ Experiments 1, 2 and 3 of Table 11 show that when the thicknesses of layers 17 and 18 are increased, the diffusion of the magenta dye developer substance to the red-sensitive emulsion layer is delayed and the diffusion of the cyan dye developer substance upwards is also delayed, making the red colors more saturated and through different colors were less contaminated. This can be seen from the reported measurement results of experiments 1, 2 and 3, since the ratio of the blue-green to the magenta dye densities in the red scale, as could be measured by measurement with red (R) light and green (G) light, is from 1: 1.63 (0.78: 1.27) shifted to 1: 2.56 (0.56: 1.43). In fact, when examining micro-cross-sections of samples of developed films D, E, and F of Runs 1, 2, and 3, it was found that significantly less magenta dye developer had migrated down from layer 12 and become trapped by emulsion layer 14 in Samples E and F.

From the results of experiments 4, 5 and 6 it can be seen that if present of "MPHQ" in layer 19, the ratio of cyan to magenta dye density is reduced even more, namely from 1: 1.73 to 1: 5.5 ..

If one looks at the actual color scales of experiments 4, 5 and 6 next to each other, it is found that in experiment 4 very little red in the purple and red red tones occurs that in Experiment 5, in which the film B has thicker interlayers possessed, the purple and red tones more saturated, but contaminated with blue-green tones are, while in experiment 6, in which the film C had the strongest interlayers, the purple-red and red tones are very saturated and only slightly by blue-green tones are contaminated.

In the series of experiments 7 to 12, the stronger intermediate layers produced 17 and 18 of experiments 8, 9, 11 and 12, even in the absence of quaternary ammonium salts, especially if "MPHQ" was present, the red tones were more saturated and were less contaminated (reference is made to the values 1: 2.68 and 1: 4.95 of the Trials 9 and 12).

In the series of experiments 13 to 18, the ratio of blue-green to Purple density if layers 17 and 18 were thicker, regardless of whether "MPHQ" was or was not present, the quaternary salt, if any, being present was in receiver sheet B, also improved, i. H. reduced (referenced be to the values 1: 2.64 and 1: 5.25 of experiments 16 and 18), from which it can be seen that the red tones have been significantly improved.

Table II also shows that the minimum density of the neutral Scale in the blue (B) part is lowest when "MPHQ" is present, namely especially when layers 17 and 18 are the strongest. (Reference is made to the D "zin values 0.40 and 0.25 of experiments 3 and 6, 1.08 and 0.54 of experiments 9 and 12 and 0.76 and 0.31 of experiments 15 to 18). This means that the yellow dye developer more complete when using »MPHQ« in the exposed and developed areas is determined. Color copies made with thicker gelatin interlayers 17 and 18 containing films therefore show less color contamination or discoloration in the areas that are still exposed.

Claims (6)

Claims: 1. Photographic material for the production of multicolored images after a diffusion transfer process in which a photosensitive Material comprising red, green and blue light-sensitive silver halide emulsion layers on a support in the specified order and subtractively colored, especially blue-green, purple and yellow colored dye developing agents adjacent to the silver halide of the corresponding emulsion layers, is exposed to an image object, whereupon the latent images of the emulsions, defining the oxidized dye developing agents in the fully or partially exposed areas. an alkaline solution developed into silver images and the non-oxidized dye developing agent through diffusion image-wise and with the correct contours on one with the light-sensitive Material in contact, pickled image receiving material to form a positive color image can be transmitted, that is to say t that the green-sensitive emulsion layer (15) of the light-sensitive material and its adjacent magenta dye developing agent (12) from the other emulsion layers and their adjacent dye developing agents through gelatin interlayers (17, 18) is separated, each at least about 75% the thickness of the yellow dye developing agent containing layer (13) and each at least about twice as much Gelatine contains like the layer (13) containing the yellow dye developer. 2. Material according to claim 1, characterized in that the dye developer substances are provided in layers containing gelatin as a binder and each are arranged under the corresponding emulsion layer. 3. Material according to claim 1 or 2, characterized in that the gelatin intermediate layers each approximately 0.75 to 3 times as thick and each contain about 2 to 6 times as much gelatin like the layer (13) containing the yellow dye developing agent. 4. Material according to one of claims 1 to 3, characterized in that in a light-sensitive Layer (19) or in a silver halide emulsion layer (16) a hydroquinone derivative in the form of phenylhydroquinone, 2'-oxyphenylhydroquinone, phenoxyhydroquinone, 4'-methylphenylhydroquinone, 1,4-dioxynaphthalene, 2- (4-aminophenethyl) -5-bromohydroquinone, 2- (4-aminophenethyl) -5-mebhylhydroquinone, 4'-aminophenethylhydroquinone, 2,5-dimethoxyhydroquinone; 2, 5-dibutoxyhydroquinone, m-xylohydroquinone, bromohydroquinone,. 3,6-dichlorohydroquinone, 2-dimethylaminomethyltoluhydroquinone, 2-cyclohexylhydroquinone, sec-butylhydroquinone, 2,5-dichlorohydroquinone, 2,5-diisopropylhydroquinone, 2,5-diiodohydroquinone, 3-chlorotoluhydroquinone, tetrachlorohydroquinone, 2,5-diphenylhydroquinone, Contain 2, 5-diresorcylhydroquinone, 2,5-dioctylhydroquinone or dodecylhydroquinone is. 5. A diffusion transfer method for producing multicolor images using the photographic material according to any one of claims 1 to 4, characterized in that the image receiving material (20, 21) bearing a multicolor, positive image is separated from the photosensitive material (10 to 19) after development will. 6. The method according to claim 5, characterized in that the photosensitive material is in the presence of a quaternary ammonium salt is developed in alkaline solution (22) or that this Ammonium salt is used in the image-receiving layer (21) of the light-sensitive material will. References considered British Patent No. 804,971.