Photographic dye-forming coupler, emulsion layer, element, and process
US5698386A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1996 |
| Grant date | Dec 16, 1997 |
| Priority date | — |
| Expiry date | Feb 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3835
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a photographic light sensitive silver halide emulsion layer having associated therewith a pyrazolotriazole dye-forming coupler having the formula: ##STR1## wherein: R.sub.1 is a substituent bonded to the pyrazolotriazole nucleus by a fully substituted carbon atom; PA1 X is hydrogen or a coupling-off group; PA1 R.sub.2, R.sub.3, R.sub.4, and R.sub.6 are independently hydrogen or substituent groups; PA1 R.sub.5 is selected from the group consisting of alkyl, alkoxy, aryl, and aryloxy groups; PA1 R.sub.7 is an alkyl group; and PA1 Y is a substituent group where m is 0 to 4. The invention also provides a coupler compound, a photographic element containing the emulsion layer of the invention, and an imaging process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.