Photographic silver halide materials and process comprising a pyrazoloazole coupler
US4942117A · kind A · utility
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6Claims
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Key dates
| Filing date | Sep 26, 1989 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Sep 26, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3835
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Novel pyrazoloazole couplers comprise an aryl or heterocyclic group having, in at least one of the ortho positions to the carbon atom (A) that is bonded to the pyrazoloazole nucleus, a substituent (B) that enables the pyrazoloazole coupler to form a magenta dye that has increased stability and has absorption controllably shifted, that is shifted hypsochromically relative to a dye formed from a similar coupler lacking substituent (B). These couplers are useful in photographic silver halide materials and processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.