Cyanine dyes with chain sulfone substituent photographic materials comprising
US5695918A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1996 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Apr 2, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A dye of the formula (I) below, and photographic elements having a light sensitive layer and which element contains such a dye: ##STR1## X.sub.1 and X.sub.2 each independently represent the atoms necessary to complete a 5- or 6-membered heterocyclic nucleus; PA1 x and y are, independently, integers from 0 to 3 provided x+y is no greater than 4; PA1 p and q each independently represents 0 or 1, PA1 each L independently represents a methine group; PA1 R.sub.1 and R.sub.2 each independently represents an alkyl group or an aryl group, and PA1 R.sub.3 represents an alkyl group, aryl group or heteroaryl group; PA1 W1 is a counterion as needed to balance the charge of the molecule.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.