Filter dye for photographic element
US4857446A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1987 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Dec 23, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/167
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Dyes having structure ##STR1## A represents a substituted or unsubstituted nucleus having a carboxyphenyl or sulfonamidophenyl substituent selected from the group consisting of 2-pryazolin-5-ones free of any substituent bonded thereto through a carboxyl group, rhodanines, hydantoins, 2-thiohydantoins, 4-thiohydantoins, 2,4-oxazolidindiones, 2-thio-2,4-oxazolidindiones, isoxazolinones, barbiturics, 2-thiobarbiturics, and indandiones, PA1 R represent hydrogen, substituted or unsubstituted alkyl of 1 to 4 carbon atoms, or benzyl, PA1 R.sup.1 and R.sup.2 each independently represents substituted or unsubstituted 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, or substituted or unsubstituted 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, represent the atoms necessary to complete a carbocyclic ring such as tetrahydroquinoyl, 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.