Zeromethine merocyanine dyes useful as spectral sensitizers in photographic elements
US5587482A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1996 |
| Grant date | Dec 24, 1996 |
| Priority date | — |
| Expiry date | Mar 7, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/167
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to a dye suitable for spectral sensitization of a photographic element. Specifically, the dye is a compound having the structure: ##STR1## wherein: R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each independently represents H; halogen; alkyl of 1-6 carbons; aryl of 6-24 carbons; alkoxy of 1-6 carbons; carbonyl; or sulfonate; or R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, or R.sup.3 and R.sup.4 taken together represent the atoms necessary to complete a six-membered carbocylic ring; PA1 R.sup.5 represents hydrogen, alkyl of 1-6 carbons or aryl of 6-24 carbons; PA1 R.sup.6, R.sup.7, and R.sup.8 independently represent alkyl 1-6 carbons; aryl of 6-24 carbons; or any pair of R.sup.6, R.sup.7 and R.sup.8 taken together represent a five- or six-member heterocyclic ring; PA1 X represents O, S, CH.dbd.CH, Se, Te or N--R.sup.10 ; PA1 Y represents O, S, or N--R.sup.9 ; PA1 Z represents O, S or Se; PA1 R.sup.9 represents alkyl of 1-6 carbons; or an aryl of 6-24 carbons; PA1 R.sup.10 represents alkyl of 1-6 carbons; PA1 n is an integer of 1-6; and PA1 Q represents a counterion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.