Color photographic material having enhanced light absorption
US6165703A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1998 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Sep 11, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/40
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A silver halide color photographic material comprises at least one silver halide emulsion comprising silver halide grains having associated therewith at least two dye layers comprising PA1 (a) an inner dye layer adjacent to the silver halide grain and comprising at least one dye, Dye 1, that is capable of spectrally sensitizing silver halide and PA1 (b) an outer dye layer adjacent to the inner dye layer and comprising at least one cyanine dye, Dye 2, wherein one of Dye 1 or Dye 2 has at least one anionic substituent and one of Dye 1 or Dye 2 has at least one cationic substituent and wherein the dye layers are held together by more than one non-covalent force; the outer dye layer adsorbs light at equal or higher energy than the inner dye layer; and the energy emission wavelength of the outer dye layer overlaps with the energy absorption wavelength of the inner dye layer. In one embodiment the invention comprises a silver halide color photographic material comprising at least one silver halide emulsion comprising silver halide grains having associated therewith at least one dye which contains an anionic substituent and at least one dye that has a cationic substituent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.