Photographic elements containing indoaniline dummy dyes
US5441856A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1993 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | Dec 17, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/53
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic element, and a method of making such an element, comprising a cyan dummy dye present in the element prior to exposure and development. The particular cyan dummy dye has a high extinction coefficient, low density losses in seasoned bleach, while maintaining the desired hue and resisting density losses on cold storage. The dye has the formula: wherein: ##STR1## n is 1, 2 or 3; each R.sub.1 is an electron-withdrawing group which may be the same or different when n is 2 or 3; PA1 R.sub.2 is an alkyl group having from one to about 20 carbon atoms, a cycloalkyl group having from 3 to 8 carbon atoms in the ring, or an aryl group; PA1 R.sub.3 is any of the groups which R.sub.2 may be or is hydrogen; PA1 R.sub.4 is selected from the group consisting of alkylsulfonyl, arylsulfonyl, alkylsulfoxyl, arylsulfoxyl, sulfamoyl, alkylsulfonate, carbamoyl, alkoxycarbonyl and acyl groups; PA1 R.sub.5 is an alkyl group; PA1 R.sub.6 is hydrogen, or an alkyl group; and PA1 R.sub.7 is hydrogen or an alkyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.