Photographic element containing a coupler capable of releasing a photographically useful group through a triazole group
US5817809A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1997 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Sep 4, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/158
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic element comprising a support having situated thereon at least one silver halide emulsion layer, the element further comprising a photographic coupler represented by the formula EQU COUP--(T.sup.1).sub.b --T.sup.2 --(T.sup.3).sub.c --PUG wherein PA1 COUP is a coupler moiety having a coupling site to which T.sup.1 is attached; PA1 T.sup.1 is a timing or linking group which releases from COUP during processing and which functions by electron transfer down a conjugated or unconjugated chain, or by a nucleophilic displacement reaction, to release T.sup.2 ; PA1 T.sup.2 is a triazole timing or linking group which, after release from T.sup.1, functions by a nucleophilic displacement reaction to release T.sup.3 or PUG and is represented by the formula: ##STR1## wherein ** denotes the point of attachment to T.sup.1 and *** denotes the point of attachment to T.sup.3 or PUG; PA1 R.sup.1 is a hydrogen or halogen atom, or an aliphatic, carbocyclic, carbamoyl, sulfamoyl, carbonamido, sulfonamido, alkoxycarbonyl, alkyl or arylketo, alkyl or arylsulfo, sulfo, hydroxy, acyl, nitro, cyano, amino, alkoxy, alkoxyalkyl, aryloxy, aryloxyalkyl, thioalkoxy, thioalkoxyalkyl, thioaryloxy, thio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.