Color photographic recording material containing a color coupler of the pyrazoloazole type
US4845022A · kind A · utility
5Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1987 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Jul 6, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/30529
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic color images with improved sensitometric properties and in particular with high maximum magenta density can be obtained by use of a color photographic recording material containing a pyrazoloazole type magenta coupler of formula I ##STR1## in which PAZ represents the group of a color coupler of the pyrazoloazole series capable of color coupling; PA0 L represents a bond containing at least 4 carbon atoms; PA0 B represents alkyl, aryl or a heterocyclic group; PA0 R.sup.1 represents H, halogen, alkyl, alkoxy; PA0 R.sup.2 represents H, alkyl, cycloalkyl; PA0 L and B together containing at least 12 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.