Material for color photography
US4268591A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 28, 1979 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | Aug 28, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D271/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Light-sensitive recording material for color photography, which contains, in at least one silver halide emulsion layer, at least one yellow coupler of the formula ##STR1## in which R.sub.1 is alkyl, R.sub.2 is alkyl or aryl and R.sub.3 is substituted or unsubstituted alkyl, alkoxy or alkylmercapto, cycloalkylmercapto, aryl, aryloxy or arylmercapto, the sum of the carbon atoms in the substituents R.sub.1, R.sub.2 and R.sub.3 being 3 to 30 and at least two of these substituents being able to form a cyclic radical together with the carbon atom to which they are bonded, the R.sub.4 s are each halogen, alkyl, alkoxy, halogenoalkyl, alkylsulfonyl or aryloxy, X is a radical detachable during the coupling reaction, A is a 5-membered, heterocyclic, unsaturated ring system which contains 2 or 3 hetero-atoms, at least one of which is a nitrogen atom, and can be fused with a benezene ring and which is substituted by at least one ballast group and r is 1 or 2. The yellow couplers show high reactivity (high maximum density), which makes possible accelerated processing of the photographic materials, and minimal fogging. The couplers also have good fastness to light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.