Solid particle dye dispersions for photographic filter layers
US4948717A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1989 |
| Grant date | Aug 14, 1990 |
| Priority date | — |
| Expiry date | Jun 30, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/46
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Dyes having the structure ##STR1## A represents a substituted or unsubstituted nucleus selected from the group consisting of rhodanines, hydantoins, 2-thiohydantions, 4-thiohydantoins, 2,4-oxazolidindiones, 2-thio-2,4-oxazolidindiones, isoxazolinones, barbiturics, 2-thiobarbiturics, and indandiones, said nucleus having a carboxyphenyl substituent or sulfonamidophenyl substituent, PA1 R represents hydrogen, alkyl of 1 to 4 carbon atoms, or benzyl, PA1 R.sup.1 and R.sup.2 each independently represents alkyl or aryl, or taken together with R.sup.5, R.sup.6, N, and the carbon atoms to which they are attached represent the atoms needed to complete a julolydyl ring, PA1 R.sup.3 represents H, alkyl, or aryl, PA1 R.sup.5 and R.sup.6 each independently represents H, or R.sup.5 taken together with R.sup.1, or R.sup.6 taken together with R.sup.2, each may represent the atoms necessary to complete a carbocyclic ring, and PA1 m is 0 or 1 are disclosed. The dyes are useful as filter dyes in photographic filter layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.