DE2127907C3 - Photographic material for diffusion transfer process - Google Patents

Description

and optionally intermediate layers, a sanding layer and or a layer containing a light reflecting agent between c) and d) and (2) a rupturable container with an alkaline, optionally containing an opacifying agent Contains developer solution arranged so that the container contains the developer solution between the dyeable image-receiving layer of the next hay-end Can distribute silver halide emulsion layer, characterized in that it contains one or more indicator dyes, at least one of which is a phenolic dye of the formula

is. in which the two ring groupings A and B are a first and a further p-hydroxyphenyl radical (p-hydroxynaphthyl radical, each with a hydrogen bridge-forming group adjacent to the p-hydroxyl group, and in which X is the completion of a lactone or a 3,4-hen / oehromanriiiges (ring grouping C) are necessary atoms, the indicator dyes mi being selected so that they absorb visible light at the first pH, but do not absorb any visible light at the lower / wide pH.

2. Recording material according to claim 1, characterized recognized / calibrated. that the index ingredient (s) in the developer solution and / Oiler are located in the emulsion layer or layers.

3. Recording material according to claim I, characterized in that the indicator dyes are in non-absorbent form in a layer permeable to the developer liquid and can be made light-absorbent by the developer liquid.

4. Recording material according to claim 3, characterized in that the indicator dyes containing layer with a pH value below its pKa value between the or the photosensitive layers and a transparent film base.

5. Recording material according to claim 1 to 4, characterized in that the indicator dyes absorb light within the spectral range of 400 to 700 nm.

The invention relates to a photographic recording material for diffusion transfer processes, in the case of at least one silver halide emulsion layer between two dimensionally stable supports is provided with an assigned developer dye, color coupler or another color former.

There are various methods of producing silver and single or multi-colored images known to the diffusion transfer process. Many of these processes are developed in the darkness. A disadvantage of these known methods is the need to develop under Exclusion of light. In contrast, a multi-part recording material is known from US-PS 34 15 644, in which the development of diffusion transfer based color images can be done in daylight. The layer structure on a translucent, dimensionally stable carrier is as follows: A or several silver halide emulsion layers with associated substances which form the dye image, those in alkalis at a first pH as a function of point exposure of their silver halide emulsion are soluble and diffusible. The image receiving layer is one that diffuses through the A dyeable polymer layer and one layer sufficient to form dye image-forming substances Acidity to lower the first pH value of the treatment liquid to a second pH value provided at which the dye image-forming substances are essentially non-diffusible are. The connection of the laminate is again formed by a dimensionally stable, transparent layer support. The development of the latent image in the recording material takes place with an alkaline one Treatment mass between recording material and image receiving material. It shows the strong alkaline vision first pH value and contains a light reflecting Means, especially titanium dioxide, which has a white background for image viewing forms and at the same time masks the developed recording material. This also creates a concealment by post-exposure over the transparent carrier before the image build-up is finished, achieved.

In the earlier application P 19 64 534.2-51 is a dye or optical filter medium described which absorbs light at the first pH

is present and can be converted to essentially not at a second pH light-absorbing product. This dye is according to this proposal together with the light reflective Fabric applied to the selectively exposed silver halide emulsion surface to protect against fogging by post-exposure when developing in the presence of actinic radiation takes place which falls on the transparent layer of the film unit. With this dye it is an indicator dye, in particular A phenolphthalein that only discolors at a relatively seb: lower second pH value.

A simultaneous proposal is that between the image receiving layer and the next one Silver halide layer provided an intermediate layer which is a dispersion of an inorganic light reflective pigment in such a concentration has to be irradiated with a given amount of actinic light as a result of Du.thgang by the silver halide emulsion layer to prevent and at least one optical filter means at a pH above the pKa of the optical Filter agent is present in such a concentration that is insufficient to allow the actinic 2s to pass through To allow radiation to a certain extent, the concentrations individually and in total insufficient are, however, together to prevent the transmission of the incident actinic radiation give a synergistic effect to prevent the necessary transmission density the transmission at a certain proportion of radiation to result in a change in the surrounding pH value takes place below the pKa value of the optical filter medium at which the transmission dichlc is sufficiently deep so that the structure of a transfer picture can be seen immediately against the background given by the reflective pigment.

The object of the invention is to provide a photographic To create recording material that can be developed when exposed to daylight, the has a good protection of its light-sensitive layers against daylight and with the Images are obtained whose image background, in particular in the highlight lights, appears pure white.

The subject matter of the invention is based on a photographic recording material for the diffusion transfer method, the following (1) Layers contains:

a) a dimensionally stable, preferably opaque layer support,

b) at least one light-sensitive silver halide emulsion layer, which has a developer dye in the same or an adjacent layer, a color coupler or another color former known for diffusion transfer processes is assigned, which form an imagewise distribution of a dye during development, which is soluble and diffusible in alkali at a first pH,

c) one that is permeable to alkaline solutions and that can be colored Image receiving layer,

d) a polymeric acid layer which is permeable to alkaline solutions and which contains enough acidic groups to reduce the first pH of a developer solution to a second pH at which the components forming the color image are essentially non-diffusible after formation of a transfer color image,
c) a preferably transparent dimensionally stable support

and optionally intermediate layers, a spacer layer and / or a layer containing a light-reflecting one Means between c) and d) and (2) a tear-open container with an optionally one Alkaline developer solution containing opacifying agents is arranged so that the container contains the Developer solution between the dyeable image-receiving layer and the closest silver halide emulsion layer can distribute. It is characterized in that it contains one or more indicator dyes Contains, of which at least one is a phenolic dye of the formula

• B

is. wherein the two ring groups A and B are a first and a second p-hydroxyphenyl radical or p-Hydroxynaphthyl radical with in each case a hydrogen bridge-forming group adjacent to the p-hydroxy group and where X is that to complete a lactone or a 3,4-benzochroman ring (Ring grouping C) are necessary atoms, the indicator dyes are selected so that they absorb visible light at the first pH, but no visible light at the lower pH Absorb light.

The term "phenol dyes" refers to the phenol and 1-naphlholderivatc of phthalides and naphthalides.

The invention makes it possible to develop the latent images within the recording material under the influence of light, without the images being obscured by post-exposure.

The indicator dyes used according to the invention have the required opacity for the strong alkaline development and can be easily and quickly changed by changing the pH value discolor. From US-PS 34 15 644 film units are already known that basically under Light influence are developable. A white pigment, such as titanium dioxide, serves as the opacifier inside the treatment or development mass. However, this development system can only be used in special cases where film speed and light intensity are sufficiently low and the The concentration of titanium dioxide is sufficiently high. However, all of these conditions are for what is customary in the trade Photo material not given, because this must be sufficiently sensitive, and the thin HnI winding layer must not impair the transfer of the dye due to an excessive concentration of white pigment hinder the image receiving element. To increase the opacity of the white pigment was already an additional one after this state of the art Opacifiers applied in the form of soot; However, this again has the disadvantage that it causes the image background and especially the highlights are no longer pure, but appear "dirty".

Mil dom recording material according to the invention such a turbidity is achieved that compared to the achieved according to the prior art is better with regard to the sensitivity required in practice. With the recording material according to the invention one does not obtain under the influence of light only usable photographs, but also a substantial improvement over the prior art in the whiteness of the highlights. It is obvious that the invention applied to discoloring indicator dyes, as far as the consideration of the background is concerned, the known Application of carbon black for this purpose are superior.

The indicator dyes used according to the invention are derived from hydroxy-substituted carbocyclic aryl compounds. Certain indicator dyes, The derivatives of phenol or benzophenol have proven to be very suitable as optical Filter means within the meaning of the invention proved to be exposed photosensitive material in front of a Post-exposure fogging in diffusion transfer photographic processes to protect in which the photosensitive material after the selective exposure and thus Build-up of the latent image and non-selective incidence of light during the initial period of development exposed outside.

Like pH sensitive dyes in general, these phenolic indicator dyes show spectral properties that are reversibly changeable with a change in the surrounding pH. They possess a strongly colored form which in alkaline medium at an initial pH value that is above their pKa value, shows an absorption in the visible spectrum, and can be in an essentially be in colorless form, d. H. in a form in which they are essentially within the visible spectrum are not light-absorbing at a less alkaline second pH value, which is below their pKa value located. The term pKa value means the pH value at which about 50% of the dye in the loan-absorbing form and about 50% in the non-light-absorbing form.

The dyes are in their colored form in the Able to absorb radiation in the shorter range of the visible spectrum to be photographic Material prior to fogging due to post-exposure within the green and red areas of the Protect spectrum. To a highly effective, light-absorbing system over the entire visible Spectrum, that is to say over about 400 and 700 nm, can be achieved using the phenol dyes according to the invention along with other optical filter media, such as other dyes, that are effective Have absorption in the shorter-wave range, apply.

These second dyes are preferably also indicator dyes, in particular indole dyes. The phenol dyes and the second dyes can at least at the beginning of the development of the latent Image in a substantially non-light-absorbing substance.

The developing dyes are preferred image forming agents Substances and represent an example of initially diffusible dye image forming Other substances that cause dye images are initially diffusible dyes, which as such are able to build up a dye image and those with the oxidation product of a silver halide capable of coupling developing agent to form a nondiffusible product. Image-forming dyes can also be formed by initially diffusible color couplers react with the oxidation product of a silver halide developer. Initially not diffusible Dyes that are capable of coupling with the oxidation product of a silver halide developer forming a diffusible dye, are also used to build up a dye image useful. Finally, initially non-diffusible dyes, which after oxidation under intramolecular ring closure into a diffusible dye, as an image-forming substance can be applied. The finished image can be built up as a result of diffusion transfer of a soluble complex of undeveloping silver halide, so that a silver image occurs can. The transferring silver halide complex can, however, also be used as an intermediate product for the construction a dye image can be used, ζ. Β by using the transferring silver to catalyze the bleaching of a dye so that one an image built up by the unreacted dye is obtained. Finally, the transferred silver halide complex can also be applied to an initially nondiffusible coupling dye or ring-closing dye to react to thereby produce a diffusible product to obtain, which can be removed from the image layer by diffusion. One receives on this Way an image from the unreacted dye, which is dye diffusion transfer process acts using color couplers, at least in part a reaction of one or several color-developing substances with one or more color couplers (USA. patents 27 74 668 and 30 87 817).

These phenolic dyes can be used in diffusion transfer processes apply where the photosensitive materials and image receiving materials are separated according to the structure of the transfer image or where a spacer layer from the photo-

4S sensitive material to expose the image in removed from the negative. In addition, the phenolic dyes can also be used for composite diffusion transfer units, as described above, can be applied when the image is in transmitted light

should be viewed as such. They can also be used in composite film units specially designed for silver transfer images for development a negative silver image as part of a »single-bath development« to create an additive color image or obtain a dye image as a result of a silver dye bleaching process (USSN 101968 - Figures 10 to 13).

From the above, it can be seen that phenolic dyes are generally used in diffusion transfer processes for producing monochrome and multicolor images using any photosensitive Materials including common and direct positive silver halide emulsions c can serve. Depending on the selected ^ photosensitive material, one or more Phenolic dyes alone or in conjunction with other optical filtering agents such as other light absorbing agents Dyes, are used.

The phcnol dyes are preferably used in conjunction used with other optical filter means, the radiation in the shorter wavelength range of the able to absorb the visible spectrum, like a second dye, which does not change its color able to change, or also a different pH-water-sensitive Dye.

As noted above, in conjunction with multi-part film units, the phenolic dyes are applied in initial arrangement in the film unit and / or by application in Compound with the developing solution and can be made ineffective to keep the image after The development can be observed by changing the pH value and / or pickling a layer. If the chosen phenolic dyes do not have the desired stability in the developer composition for long Have storage times, they can be initially arranged in the film unit, or they are in stored in a two-part cushion, they can also be stored separately from in a cushion assigned by rwci The developer solution must be kept until it is destroyed, whereupon the dye can mix with the developer solution.

According to a preferred embodiment of the recording material according to the invention, a or several second pH-sensitive dyes together with the above-mentioned indicator phosphol dyes applied. These dyes are able to collectively absorb radiation of the wavelength range absorb from 400 to 700 nm. The film unit wrist is a multilayer recording material and an image receiving material. The recording material has the following arrangement a first film support, two or more photosensitive silver halide emulsion layers, which in each case a connection is assigned which, as a function of the development of the latent image, is an image-correct one Able to make available the distribution of image-forming material and the or treatment mass is soluble and diffusible. The image receiving material takes in a Layer on the diffusing image-forming substance. give way to a second film carrier is located. Finally, there are also acidic substances to lower the pH value. In combination with this multi-layer structure, a destructible container containing the treatment or developing compound.

The ring-forming unit of the phenol dyes used according to the invention can be as in usual pH-sensitive dyes around one Act phenolate, carboxylate or sulfonate, preference is given to phenolate, such as 3,4-benzochroman, or a Carboxylate, such as a phthalide or naphthalide.

The new indicator dyes used with preference correspond to the formula

are droxyphcnylreste. Of the napyllium residues at least one of the grouping

R ¹ OH

-R-

wherein one of the substituents R ¹ , R ^{2 is} a hydrogen-bonding group and the other is a hydrogen atom. The hydroxyphenyl radicals contain the group

OH

wherein R ^{3 is} a hydrogen bonding group and X ^{0 are} the atoms required to complete the ring-closing unit, this being a phthalide or naphthalide, provided that the phthalide having a carboxy group in at least one of the 4 or 7 positions when A ⁰ and B is ^{0 are} p-hydroxyphenyl radicals.

If A ⁰ and B ^{0 are} p-hydroxynaphthyl radicals, preference is given to substances in which R ^{2 is} a hydrogen-bonding group and the second p-hydroxyphenyl group of the formula

B °

(Ia)

X ⁰

where A ⁰ and B ⁰ p-hydroxynaphthyl- or p-Hy-

corresponds to, where R * is a hydrogen-bonding group, namely the same or a different as

R ² can be.

The 1-naphtholphthalide and -naphthalide possess generally good stability in an alkaline environment. However, it was found that Although the phenol-naphthalides also show good stability in aqueous alkalis, the unsubstituted phenolphthalides but tend to change their color very quickly in an alkaline and strongly alkaline environment lose. It has been found that phenolphthalide indicator dyes can be stabilized in alkalis like the naphthalides by substitution with a carboxy group in the 4- and / or 7-position of the phthalide ring system.

It was also found that the pKa value of the phthalides and naphthalides of phenol and 1-naphthol, This is the pKa value that causes the color, which is increased by substituting hydrogen-binding agents Groups on phenol or 1-naphthol residues. In particular, the pKa value of 1-naphtholphthalides becomes and naphthalides increased by substituting one of the p-hydroxynaphthyl radicals with a hydrogen-binding one Group on a carbon adjacent to the p-hydroxy group. Are both p-hydroxynaphthyl radicals with a hydrogen bonding group

609 652/169

substituted, one represents a further increase in the pKa value. The pKa values of Phenol halides and naphthalides by substitution of hydrogen-binding groups on b;: ide naphthol residues increased in o-position to the p-hydroxy group.

The inducible indicator dyes are already at a higher level due to their colored form pH effective as an optical filter medium.

Any hydrogen-binding groups can be used to increase the pKa values of the substances. The association of two atoms via hydrogen with the formation of a so-called water bond between or within molecules is known. If the hydrogen atom is attached to an electron-equal atom, such as oxygen or nitrogen, the bond that occurs is polarized. If it is directed towards another atom (M) with an unseparated pair of electrons, the hydrogen atom acts as a bridge between these atoms (O - H ... M) on Cir and the electrostatic attraction of the two atoms, between which the proton can be shifted . According to the invention, an intramolecular hydrogen bond is formed between the p-hydroxy group and the adjacent hydrogen-bonding group, that is, a group containing a hetero atom which has an active, unseparated electron pair, such as oxygen. Sulfur or halogen, e.g. B. fluorine, which has a free pair of electrons or a negative charge in alkaline solution and is capable of 5-, 6- or 7-membered, preferably 5- or 6-membered. to form hydrogen-bonded rings with the p-hydroxy group. In a preferred embodiment, the heteroatom in the hydrogen-bonding group is linked to a proton which is more acidic than the proton of the phenolic or naphtholic hydroxyl group and ionizes to a negative charge in alkaline solution. Examples of these are the carboxy, hydroxy and o-hydroxyphenyl groups. bis-trifluoromethylcarbinol. Sulfonamido group (-NH-SO ₂ -K ¹¹ , where R ^{0 can be} an alkyl, aryl or alkaryl group) and the sulfamoyl group (-SO ₂ - NIl - R '. Where R can be an alkyl, aryl or alkaryl group ). The substituents R. R 'can be straight or ver / weigtkeltige alkyl groups - z. B. methyl, ethyl. Isopropyl, t-butyl, hexyl, octyl, dodecyl, hexadecyl. Octadecyl and eicosanyl groups. Aryl groups such as phenyl and naphthyl groups and alkaryl groups such as benzyl, Plienäthyl-, Phenylhcxyl-. ρ - be octylphynyl and p-dodecylphynyl.

If it is desirable that the indicator dye is essentially immobile or non-diffusible in the developing or processing solution, compounds with sulfamoyl or sulfonamido substituents have the advantage of being immobilizable together with the hydrogen-binding function in the sulfamoyl and sulfamoyl substituents {—NH SO ₂ - R "or -SO ₂ NH-R ') which contain immobilizing substitutions R, R', such as the hexadecyl or p-dodecylphenyl group.

Compounds according to the above general formula can, in addition to the hydrogen-binding groups on one or both of the radicals and / or the ring-connecting unit there are still further substituents tra-Lvn. / B solubilizing groups to improve solubility in certain developer compositions or immobilizing groups, if the Indikalorfarl substance in the developer composition essentially nicl should be made dilfusible, or also hydrogen-binding or other groups to the Eit Setting the desired pKa value for certain development conditions. After all, we can Other substituents, such as alkyl groups, which have no interaction with the photographic punctures

ίο the indicator dyes in their application as or. Table filter media enter into, are present, such as branched or straight-chain alkyl groups, aryl groups and alkaryl groups such as benzyl, phenethyl, Ph ' nylhexyl and p-dodecylphenyl and alkoxy groups, such as methoxy, ethoxy, butoxy, I-Älhoxj 2 - (/. '- ethoxy - ethoxy) - or octadecyloxy groups, finally aryloxy groups, such as phenoxy, benzy oxy- and naphthoxy, also alkoxyalkyl groups, w methoxyethyl, ethoxyethoxyethyl and dodecylox; ethyl groups; In addition, however, halogen atoms such as fluorine, bromine or ChIo are also needed Sulpho groups, carboxy groups, hydroxyl groups and amino groups including I- and 2-fold subst tuted amino groups, such as N - alkylamino and Ν, Ν'-dialkylamino groups. These substituents kör nen are present on one or both radicals and or also occur in the ring-closing unit Finally, substituents in Forr

a condensed ring system. So kör nen z. B. one or both radicals with a cycloaliphatic or aromatic ring as a substituent
or represent 6 members and be carbocyclic or heterocyclic, optionally substituted and bonded to the adjacent carbon atom, such as

OH

and

wherein R ⁰ e.g. B. is a hydroxyl group.

The dyes can be present in the film unit from the start, e.g. B. in a layer that extends over one or both surfaces of the photosensitive] layer. If the photosensitive material is selectively exposed through a layer containing an indicator dye, the dyes should be in a non-light-absorbing form until the developing or treatment solution is applied. However, the dyes can also be used in their light-absorbing form from the start
be included in the development or treatment compound.

In a photographic process in which the optical filter means remain in one layer, through which the picture is viewed, you can after picture construction by setting the pH at which the dye is essentially non-absorbent in the visible spectrum. the Decolorize indicator dye.

In procedures where the optical filter means is removed or separated from the layer bearing the image or remains in a layer that contains the Viewing the image is not adversely affected, it is not necessary to include the indicator dyes in the not to transfer light-absorbing form, however one can. if desired, fade the color.

After development, the optical filter medium should be in the form of the indicator dye Form or position are present, that is, when viewing the image it doesn't bother. This can be achieved in a number of ways, e.g. B. by arranging the optical Filter means behind the reflective layer that the masking of the light-sensitive layers and the image viewing through the transparent Image receiving clement permitted against this background. As mentioned above, the erfindungsgcmäücn Phenolic raw materials are essentially colorless due to lowering of the surrounding pH be made. Since the filter medium is essentially non-light-absorbing in the visible spectrum is made, it need not be arranged behind the reflective layer. It can be before or exist within them.

For use in diffusion transfer processes. those with highly alkaline developer solutions work, it is desirable that the than optical Filter agent used indicator dyes have a relatively high pKa value, so that the dye is in its light absorbing form during the first time of development and then within a relatively short interval if the pH is lowered after the image has been built up becomes essentially non-light absorbing. As mentioned, in diffusion transfer processes using reflective, multi-part, photosensitive materials, indicalor dyes as optical filter media initially in a layer of the film unit, but is preferred their initial presence in the developer mass, which is applied after the selective exposure of the recording material. Is he located in the developer composition, it is desirable that the Dye has good stability in a highly alkaline environment in addition to its absorption in the visible spectrum and has a high pKa. The dyes used as optical filter media should essentially not be diffusible in alkaline developing agents. for optimal effectiveness as a radiation filter to ensure optimal effectiveness as a radiation filter and a Prevent diffusion of the filter media into layers of the unit where it is undesirable.

The dyes to be used according to the invention exhibit a combination of properties that make them suitable for any intended use, namely, (1) effective absorption of acoustic radiation within the wavelength range of about 5 (X) to 7 (X) nm. (21 high ρ Ka value, namely 11 and above. (31 Stability in highly alkaline Medium and other cases (4 | not diffusing in aqueous alkalis. These dyes come under the formulas II and III. In the phenol derivatives

HO

R ¹
I. I. Ι R ¹
ι A. \ j Λ. V /
χ- \
O
λ

-OH

ΠΙ)

O

R ^{1 is a} hydrogen-bonding group with a negative charge in alkaline solution and X 'are the atoms required to complete the ring-closing component in the form of a phthalide or naphthalide, the latter having an aiboxy group in at least one of the 4- and 7-positions is substituted.

The lingual naphthalides and arboxyphthalides the formula

and

have a carboxyl group as at least one of the substitutions R ^:. R ' ¹ on.

The 1-naphthol derivatives correspond to the formula

OH

OH

The phenol derivatives of the formula II and the 1-naphthol derivatives Formula 111 are new indicator ingredients (P 21 66 141.6).

Like the substances of formulas I and Ia can also the substances of formulas II and HI are further substitutes contain that are not photographic

r-unkiion as an optical filter medium affect how solubilizing groups or immobilizing groups Groups. One becomes rather the immobilizing function mn the water-binding function Selection of an appropriate substituent, such as a sulfonamide or sulfamoyl group. their substitutes R °, R 'a long alkyl group or are a different bulky group, unite, as a separate immobilizing group next to the substance-binding group Group to be provided. For the substances of the formulas II and II, further substituents can be used on the phenol or I-maphthol radicals and or the ring-closing unit may be present.

Examples of developing dye according to the invention are given below as optical filter media. The substances of the formulas 10 to 24 and 2 to 32 are new Phcnol dyes. which fall under the general formulas Ia and II, while the substances of the formulas 33 to 56 ίο are examples of new l-naphthol dyes of the general formulas Ia and III.

HO--!

OH

H, CO

HO

OCH ₃

15th

SO ₂ - NH- C ₁₂ H ₂₅ 16

SO ₂ -NH-C ₁₂ H ₂₅

HOJ CH ₁ -SO ₂ -HN- ¹

HO (CHj) ₂ CH

NH-SO ₂ -C ₈ H ₁₇ CH,

NH-SO ₂ -QH ₁₇

CH ₁ - ( ⁷ V-OH

HO

CH (CH.,),

^ OH
^ J-NH-SO ₂ -C ₁₁₁ H _3. ,

(4)

(5)

(6)

(7)

652/169

H ₃₅ C ₁ ;

OH

NH-SO ₂

Br O

OH

HO

-OH

OCHj

IK) OC O

19th

HO

OH

J — NH -

20th

SO ₂ -NH-C ₁₂ H ₂₅

NH-SO

NH-
I. f ν y -SO ₂ - -OH CH ₃

C ₁₂ H ₂₅

NH-SO ₂ -QH ₁₇

21

HO-ι "* C ₁₁₁ H.,., - SO, -HN

22nd

V-OH
J-NH-SO ₂ -C ₁₁₁ -H ₁ ,

23

HO

H ₁₁ C ₁₁₁ -NH-O ₂ S

(20)

(21)

C ₁₂ H ₂₅

(22)

(23)

09 052/1 ό

HuC ₁₁₁ -SO ₂ -HN-L

OH

26th

(24)

- OH

OH

(25)

NH-SO ₂ -C ₃ H ₇

(26)

NH-SO ₂ -C ₁₁₁ H ₃ .

(27)

OH

OH

28

SO ₂ -NH-C ₁₂ II ,,

(28)

(29)

(30)

(3D

O ·

30th

OH OH

CC) OH

OH OH

OH OH

OH COOH

HOOC OH

HOOC

COOH

(34)

HOOC OH

OH

OH

652/169

OH

OC ₁₂ H ₂₅ COOH

HOOC

OH

NH-SO ₂ -L ₁₂ Ii ₂₅ HO ₂ C

36

COOH

H ₂₅ C ₁ , -SO, -HN (44)

(45)

(46)

(47)

37

38

OH

COÖH

(48)

OH

H ₇ C ₁ -NH-SO ₂

SO ₂ -NH-CjH ₇

(49)

OH

HOOC

H ₃₃ C ₁₆ -SO ₂ -HN

H ₃₃ C ₁₆ -SO ₂ -NH OH

SO ₂ -NH-C ₃ H ₇

(5Oj

39

OH 40

HC- SO. Nil ■ Ί Nil -SO, C ₁ JI

,, C _r SO ₁ -NII -

(531

154)

652 / T69

41

42

SO, - Nile OH

Oil NH-SO,

I.

11,., C ₁₁₁ -HN-SO,

OH

SO ₂ -NH-C _1n II,.,

(56)

> = o

(57)

COOH

COOH

OH

HO

46

(61)

OH

0 O

OH

(62)

OH OH OH OH

(63)

Claims (1)

Patent claims: 1. A pholographic recording material for the diffusion transfer process which (1) Layers contains: a) a dimensionally stable, preferably opaque layer support, b) at least one light-sensitive silver halide emulsion layer, which in the same or an adjacent layer in each case a developer dye, a color coupler or a other color formers known for diffusion transfer processes is assigned, the form an image-wise distribution of a dye in the process of development, which in alkali is soluble and diffusible at a first pH, c) an image-receiving layer permeable to alkaline solutions, d) a polymeric acid layer which is permeable to alkaline solutions and which is sufficiently acidic Contains groups to determine the first pH of a color transfer image after formation To reduce developer solution to a second pH, at which the building up the color image Components are essentially not diffusible, e) a preferably transparent, dimensionally stable one Support