Magenta image-dye couplers of improved hue
US5256528A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1992 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Apr 23, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/30529
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic element and process provide a magenta coupler of the formula: ##STR1## wherein (a) at least one of X1, X2 and R1 and at least one of R2 and R3 is a substituent individually selected from carbamoyl, alkoxycarbonyl, aryloxycarbonyl, sulfamoyl, alkylsulfonyl, arylsulfonyl, alkoxysulfonyl, aryloxysulfonyl, alkylsulfoxyl, arylsulfoxyl, acyloxy, cyano, nitro, and trifluoromethyl; PA1 (b) the substituents X1, X2, R1, R2 and R3 not selected from the (a) group may be selected from alkyl, alkoxy, aryloxy, acylamino, alkylthio, arylthio, sulfonamido, alkylureido, arylureido, alkoxycarbonylamino, aryloxycarbonylamino, and halogen and in the case of R3 hydrogen; PA1 (c) substituents R1 and R2 are para or meta to the carbon attached to the nitrogen atom; PA1 (d) a and b are 1 to 3; PA1 (e) Q is an alkylthio or arylthio coupling-off group. The element provides a deeper magenta hue and reduced blue absorption by the resulting magenta dye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.