Photographic element having improved magenta dye light stability and process for its use
US5925503A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1997 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Jan 15, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3835
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a photographic element comprising a silver halide emulsion layer having associated therewith a dye-forming coupler represented by formula I: ##STR1## wherein X is hydrogen or a coupling-off group; and PA2 R' is a tertiary alkyl group and R" represents the group ##STR2## in which R.sup.1, R.sup.2, and R.sup.3 are independently selected alkyl groups, provided that any two of R.sup.1, R.sup.2, and R.sup.3 may join to form a ring; PA3 R.sup.4 is hydrogen or a substituent, provided that R.sup.3 and R.sup.4 may join to form a ring when R.sup.4 is a substituent; and PA3 W is a substituent selected from the group consisting of --C(O)R.sup.5, --SO.sub.2 R.sup.5, and --P(O)(OR.sup.6).sub.2 in which R.sup.5 is selected from the group consisting of alkyl, aryl, alkoxy, aryloxy, alkylamino, and arylamino groups and R.sup.6 is selected from the group consisting of alkyl and aryl groups. The element exhibits improved magenta dye light stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.