Photographic material having releasable compound
US4912024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1988 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Jun 21, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/158
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic elements are disclosed having a first coupler represented by the formula: EQU COUP.sub.1 --T--INH--CH.sub.2 --Q wherein PA0 COUP.sub.1 is a coupler moiety, PA0 T is a timing group that is bonded to the coupler moiety at a coupling position and that is cleaved from --INH--CH.sub.2 --Q after it is released from the coupler moiety upon exposure and processing of the element, and PA0 INH--CH.sub.2 --Q is a development inhibitor moiety wherein Q is a ballasting group, and PA0 a second coupler represented by the formula: EQU COUP.sub.2 --(TIME).sub.n --S--R.sub.1 --R.sub.2 PA0 wherein COUP.sub.2 is a coupler moiety, TIME is a timing group, n is 0 or 1, R.sub.1 is a divalent linking group that does not include a heterocyclic ring attached directly to S, and R.sub.2 is a water solubilizing group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.