Silver halide photographic elements containing 2-equivalent 5-pyrazolone magenta couplers
US5663040A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1996 |
| Grant date | Sep 2, 1997 |
| Priority date | — |
| Expiry date | Feb 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/30529
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Silver halide photographic element comprising a support and at least one silver halide emulsion layer having therein a 2-equivalent 5-pyrazolone magenta coupler represented by the formula: ##STR1## wherein a represents an integer from 0 to 3, PA1 b represents an integer from 0 to 2, PA1 R.sub.1 and R.sub.2 are each individually hydrogen, alkyl, alkoxy, halogen, aryl, aryloxy, acylamino, sulfonamido, sulfamoyl, carbamoyl, arylsulfonyl, aryloxycarbonyl, alkoxycarbonyl, alkoxysulfonyl, aryloxysulfonyl, alkylureido, arylureido, nitro, cyano, hydroxyl or carboxy group, PA1 R.sub.3 is halogen atom, alkyl or aryl group, PA1 X is a direct link or a linking group, PA1 Ball is a ballasting group which renders a group to which is attached non-diffusible in photographic coatings, and PA1 the sum of the sigma values of R.sub.1, R.sub.3 and X-Ball is less than 1.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.