Photographic elements containing 2-equivalent pyrazolone magenta dye forming couplers and stabilizing compounds
US5491054A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1994 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/39296
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A silver halide photographic element comprising a light sensitive silver halide containing layer which also contains a 2-equivalent pyrazolone magenta coupler, a thiomorpholine dioxide compound which has an alkoxy substituted aryl group substituent on the ring nitrogen, a compound of formula (I) below, and a hydroquinone compound of formula (R) below: ##STR1## wherein: R.sub.3, R.sub.4 and R.sub.31 are independently an alkyl group or H; R.sub.11, R.sub.12 and R.sub.21 are alkyl groups. The presence of the compound (I) when used with the two-equivalent pyrazolone magenta coupler and compounds (R) and (S), can result in a photographic element with low printout and/or thermal discoloration problems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.