Yellow photographic color couplers containing 3-imino-1,3,4-thiadiazolyl-4 groups
US4229577A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1978 |
| Grant date | Oct 21, 1980 |
| Priority date | — |
| Expiry date | Apr 27, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/30535
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Color photographic material is provided which contains at least one silver halide emulsion layer containing a yellow color coupler of the formula ##STR1## wherein G is the radical of a yellow coupler which is bonded to the heterocyclic ring by means of the active methylene group, Z is --CO-- or --SO.sub.2 --, M is hydrogen if Z is --CO--, or a substituent and R is hydrogen or a substituent. The new two-equivalent yellow couplers lead due to their improved reactivity (high maximum density), minimal fog and high fastness to light and outstanding spectral properties of the dyestuffs formed therefrom to a color photographic material of advantageous properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.