Photographic element with dye-forming coupler and image dye stabilizing coupler solvent
US6846620B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Jun 27, 2003 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Jun 27, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/39236
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic elements are disclosed comprising a silver halide emulsion layer having associated therewith a dye forming coupler and a compound of the following Formula I:R1R2N—C(O)—(R)p—C(O)—NR3R4 wherein R represents a hydrocarbon linking group; p=0 or 1; and each of R1, R2, R3 and R4 independently represents an aromatic, cyclic, linear or branched chain hydrocarbon group, or R1 and R2 or R3 and R4 combine together to form a ring with the associated nitrogen atom to which they are attached; with the proviso (i) at least one of R1, R2, R3 and R4 comprises an aromatic, cyclic, secondary alkyl, or otherwise or branched hydrocarbon group, or (ii) at least R1 and R2 or R3 and R4 combine together to form a ring with the associated nitrogen atom. Photographic elements of the present invention upon exposure and photographic processing exhibit good activity and yield dye images that have unexpected and substantial improvements in the stability of the formed image dyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.