Photographic element containing dispersions of high dye-yield couplers having improved photographic activity
US5830632A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1996 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Oct 31, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/156
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic element are described comprising a support bearing a photographic silver halide emulsion layer having associated therewith a micro-precipitated dispersion of a high dye-yield coupler having the formula: EQU COUP--(T).sub.m --L--DYE where COUP is the coupler moiety of the coupler capable of reacting at the coupling position with oxidized color developer to form a first dye, T is one or more timing groups with m=0, 1 or 2, L is a linking group selected from the group consisting of --OC(O)--, --OC(S)--, --SC(O)--, --SC(S)--, or --OC(.dbd.NSO.sub.2 R)--, where R is a substituted or unsubstituted alkyl or aryl group, and DYE is a second dye or precursor thereof comprising an electrically neutral chromophore. The invention also provides a photographic coupler dispersion, a photographic silver halide emulsion, and a process for forming an image in a photographic element in accordance with the invention. The photographic element, coupler dispersion, silver halide emulsion, and imaging process provide improved reactivity and photographic properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.