# US 4,393,132 A · Photographic recording material with arylazocyanoacetic ester dye releasers

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- Number: US 4,393,132 A
- Document ID: US4393132A
- Status: Granted
- Kind: A
- Application number: 06/371,076
- Filed: 1982-04-23
- Granted: 1983-07-12
- Earliest claimed: 1981-04-30
- Assignees: Agfa-Gevaert
- Inventors: Gunther Schenk; Peter Bergthaller; Gerhard Wolfrum; Rudolf Stolzenburg
- Web page: https://patentgrep.com/patent/US4393132A

## CPC

- C09B 45/14: Monoazo compounds
- G03C 8/10: of dyes or their precursors
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)
- G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G)

## Abstract

For the production of light-fast yellow images (transfer images and retained images) by the dye diffusion transfer process dye-releasers are useful which on development release diffusible azo dyes which can complex with nickel or copper ions and which in one of their tautomeric forms correspond to the general formula: ##STR1## wherein R.sup.1 represents alkyl, alkenyl or cycloalkyl having up to 8 carbon atoms, Z represents a radical required for completing a benzene or naphthalene ring; and L represents a substituent having a group which results from the splitting from a carrier radical.

## Claims

### Claim 1

In a color photographic recording material for the production of colored images by the dye diffusion transfer process, comprising at least one photosensitive silver halide emulsion layer and associated thereto a nondiffusing color-providing compound, capable of releasing under the conditions of alkaline development and as a function of the development of the silver halide emulsion layer, a diffusible azo dye which can complex with metal ions, the improvement according to which the released azo dye in one of its tautomeric forms corresponds to the following general formula II ##STR23## wherein R.sup.1 represents alkyl, alkenyl or cycloalkyl having up to 8 carbon atoms,
Z represents a radical required for completing a benzene or naphthalene ring; and
L represents a substituent having a group which results from the splitting from a carrier radical.

### Claim 2 (depends on 1)

The recording materials as claimed in claim 1, wherein the diffusible azo dye which can complex with metal ions corresponds to the following general formula III ##STR24## wherein X represents H;
R.sup.1 represents alkyl, alkenyl or cycloalkyl having up to 8 carbon atoms;
R.sup.2 represents H or Cl;
R.sup.4 represents H, Cl, --CH.sub.3, --OCH.sub.3 or --OC.sub.2 H.sub.5,
m represents 0 or 1, and
n represents 0 or 1.