Photographic silver halide elements containing solid particle dispersions of dyes
US4948718A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1989 |
| Grant date | Aug 14, 1990 |
| Priority date | — |
| Expiry date | Jun 27, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B23/107
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Solid particle dispersions of dyes according to the formula: ##STR1## are useful as filter dyes in photographic elements. In this formula, R.sub.1 and R.sub.2 are each independently substituted or unsubstituted alkyl or substituted or unsubstituted aryl, or together represent the atoms necessary to complete a substituted or unsubstituted 5- or 6-membered ring. R.sub.3 and R.sub.4 each independently represents H, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, CO.sub.2 H, or NHSO.sub.2 R.sub.6. R.sub.5 is H, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, carboxylate, or substituted or unsubstituted acyl, R.sub.6 and R.sub.7 are each independently substituted or unsubstituted alkyl or substituted or unsubstituted aryl, and n is 1 or 2. R.sub.8 is either substituted or unsubstituted alkyl, or is part of a double bond between the ring carbon atoms to which R.sub.1 and R.sub.2 are attached. At least one of the aryl rings of the dye molecule must have at least one substituent that is CO.sub.2 H or NHSO.sub.2 R.sub.6.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.