Photographic elements containing 2-equivalent pyrazolone magenta dye forming couplers and fade reducing compounds
US5484696A · kind A · utility
6Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1994 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/39276
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A silver halide photographic element having a light sensitive silver halide which layer also contains a 2-equivalent pyrazolone magenta coupler, a compound of formula (S) below, and a hydroquinone compound of formula (R) below: ##STR1## wherein: R.sub.1 is an alkyl group; and R.sub.2, R.sub.3 and R.sub.4 are independently an alkyl group or H. The presence of the compound (S) when used with the two-equivalent pyrazolone magenta coupler and compound (R), can result in low magenta dye fade, increased wavelength of maximum absorption of the magenta dye and increased magenta dye bandwidth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.