Solid particle dispersions of filter dyes for photographic elements
US5098820A · kind A · utility
7Cited by
5References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1990 |
| Grant date | Mar 24, 1992 |
| Priority date | — |
| Expiry date | May 7, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/832
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Solid particle dispersions of dyes according to the formula: ##STR1## are disclosed as filter dyes for photograhic elements. In this formula, PA1 m is 0 or 1. PA1 R.sub.1 and R.sub.2 are each independently substituted or unsubstituted alkyl or substituted or unsubstituted aryl, or together with R.sub.3 and R.sub.4 form a heterocyclic ring. PA1 R.sub.3 and R.sub.4 are each H or together with R.sub.1 and R.sub.2 form a heterocyclic ring. PA1 A is a ketomethylene residue. PA1 X represents a carboxyphenyl or sulfonamidophenyl, or a carboxy or sulfonamido substituent that is appended to an aryl ring that is part of A.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.