Photographic color couplers and photographic materials containing them
US5411848A · kind A · utility
0Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1994 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Jul 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/367
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A photographic element, and coupler employed therein, comprises a photographic silver halide emulsion layer containing a yellow dye-forming coupler having a the general formula: ##STR1## wherein Z is a ballasted group which splits off on silver halide development which is of such size and configuration to render the coupler non-diffusible in photographic layers, prior to splitting off, and R.sup.1 and R.sup.2 are each individually an alkyl or aryl group whose combined effect is to render the yellow dye formed on coupling sufficiently mobile to produce image smearing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.