Photographic elements containing particular color couplers in combination with hydroquinone type stabilizers
US5434041A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1993 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Apr 2, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3013
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic element having at least one photosensitive silver halide layer and associated therewith both a particular type of color coupler and a particular type of stabilizer. The color coupler is of the general formula (1) or (2): ##STR1## wherein A and B represent the same or different electron-withdrawing group, PA1 X is H or a group which splits off on coupling with oxidized color developer, PA1 R is an alkyl, cycloalkyl, aryl or heterocyclic which may be substituted, --COR.sup.1, --CSR.sup.1, SOR.sup.1, SO.sub.2 R.sup.1, --NHCOR.sup.1, --CONHR.sup.1, --COOR.sup.1, --COSR.sup.1, --NHSO.sub.2 R.sup.1 wherein R.sup.1 is an alkyl, cycloalkyl, or aryl group any of which are optionally substituted, and wherein two or more of A, B, R, and X optionally form part of a ring, PA1 Link is a linking group and PA1 n is 0, 1 or 2. The stabilizer is of the general formula: ##STR2## wherein: E.sup.1, E.sup.2, W.sup.2 and W.sup.3 may independently be a hydrogen atom, a substituted or unsubstituted aliphatic group, a substituted or unsubstituted aromatic group, an acylamino group, a mono or dialkylamino group, an aliphatic or aromatic thio group, an aliphatic or aromatic oxycarbonyl group, o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.