Color photographic element containing a fragmentable electron donor in combination with a one equivalent coupler for improved photographic response
US6242170A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1999 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Dec 20, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/156
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention provides a multicolor photographic element comprising a support bearing a cyan dye image-forming unit comprising at least one red-sensitive silver halide emulsion layer having associated therewith at least one cyan dye-forming coupler, a magenta dye image-forming unit comprising at least one green-sensitive silver halide emulsion layer having associated therewith at least one magenta dye-forming coupler, a yellow dye image-forming unit comprising at least one blue-sensitive silver halide emulsion layer having associated therewith at least one yellow dye-forming coupler, wherein at least one of said emulsion layers comprises large tabular grains having an average equivalent circular diameter of greater than 3 .mu.m and contains a one equivalent image dye-forming coupler and a fragmentable electron donating compound of the formula: X--Y' or a compound which contains a moiety of the formula --X--Y'; wherein PA1 X is an electron donor moiety, Y' is a leaving proton H or a leaving group Y, with the proviso that if Y' is a proton, a base, .beta..sup.-, is covalently linked directly or indirectly to X, and wherein: PA2 1) X--Y' has an oxidation potential between 0 and about…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.