Photographic element and process comprising a dye releasing group
US4840884A · kind A · utility
36Cited by
13References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1987 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Oct 19, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/159
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A new photographic coupler comprises a coupling-off group bonded to the coupler at the coupling position represented by the formula: EQU --L--NR.sup.1 --DYE wherein L is a linking group; NR.sup.1 is a substituted nitrogen atom bonded to DYE that together with NR.sup.1 is a releasable dye comprising an electrically neutral chromophore. Such a coupler enables dye hue stabilization without mordanting the dye formed. Such a new coupler is useful in a photographic silver halide element and process to provide increased dye density, higher contrast dye images, and lower pH sensitivity upon processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.