Combination of yellow filter dye and 4-equivalent pyrazolone magenta coupler
US5695917A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1995 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Nov 22, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2003/006
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic element contains a four-equivalent pyrazolone magenta coupler and a yellow filter dye represented by Formula I. ##STR1## wherein: A is an acidic nucleus selected from the group consisting of benzoylacetonitrile, 2-phenyl-1,1,3-tricyanopropene, 5-pyrazolone, isooxazolone, barbituric acid, thiobarbituric acid, rhodanine, hydantoin, thiohydantoin, oxazolidindione, pyrazolidindione, indandione, pyrazolopyridone, 1,2,3,4-tetrahydroquinolin-2,4-dione, 3-oxo-2,3-dihydrobenzod!thiophene-1,1-dioxide and 3-dicynaomethine-2,3-dihydroxybenzod!thiophene-1,1-dioxide; PA1 L.sup.1-3 each independently represents a substituted or unsubstituted methine group; PA1 n is 0 or 1; PA1 R.sup.1-2 each independently represents hydrogen or an alkyl, aryl or acyl groups (including, for example,alkoxycarbonyl, amido and carboxyl); PA1 Y represents non-metal atoms which form a five membered heterocyclic ring optionally comprising a fused substituted or unsubstituted benzene ring; and wherein the dye comprises at least one ionizable group with a pKa value between 4-11 such as a carboxyl group, a sulfonamido group or a sulfamoyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.