Fragmentable electron donor compounds in combination with high bromide tabular grain emulsions
US6518008B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1999 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Jan 25, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
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 silver halide emulsion layers contains a tabular grain silver halide emulsion having a halide content of at least 95% bromide and less than about 5% iodide, said iodide being substantially uniformly distributed in the silver halide grains of said emulsion, and said emulsion is sensitized with a fragmentable electron donor of the formula X—Y′ or an electron donor which contains an —XY′ moiety; whereinX 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, &bgr;−, is covalently linked di…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.