Photographic element containing an azopyrazolone masking coupler exhibiting improved keeping
US5591569A · kind A · utility
1Cited by
5References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1995 |
| Grant date | Jan 7, 1997 |
| Priority date | — |
| Expiry date | Oct 5, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention provides a photographic process and element where the element comprises a support bearing a light-sensitive photographic silver halide layer containing (1) a bicyclic azole coupler, (2) an azopyrazolone masking coupler, and (3) an aromatic electron-rich compound having ring substituents for which the sum of the individual Hammett sigma-para values is more negative than -0.80.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.