1,2,4-triazole-releasing pyrazolone DIR couplers
US5821043A · kind A · utility
8Cited by
8References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1996 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Dec 30, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/384
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention provides a photographic element comprising a support bearing one or more silver halide emulsions and one or more pyrazolone magenta dye-forming DIR couplers of structure I: ##STR1## wherein: the R.sub.1 substituents are individually selected from halogen atoms and alkyl, phenyl, alkoxy, phenoxy, alkylthio, carbonamido, sulfonamido, carbamoyl, alkoxycarbonyl, and aryloxycarbonyl groups; PA1 n is 0 to 5; PA1 R.sub.2 is an alkyl group or a phenyl group; and PA1 R.sub.3 is an alkylthio group, an arylthio group, an alkoxycarbonyl group or an aryloxycarbonyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.