Photographic elements containing pyrazolone couplers and process
US5262292A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1992 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Apr 23, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3012
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Pyrazolone magenta dye-forming couplers having a particular arylthio coupling-off group enhance the photographic properties and improve the manufacturing and handling characteristics of materials and processes employing such couplers. The coupler contains an N-phenyl group, a 3-anilino group and a 4-(arylthio) coupling off group containing a particular aryloxymethylacylamino group as an ortho substituent. A broad range of improvements are realized including stability, reactivity, hue, and dye density in addition to simplified and safer manufacture. The coupler may be represented by the following formula where the substituents and variables are as defined in the specification: ##STR1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.