Low staining green spectral sensitizing dyes and silver chloride emulsions containing iodide
US5674674A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1995 |
| Grant date | Oct 7, 1997 |
| Priority date | — |
| Expiry date | Dec 27, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/03
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to a photographic element comprising a silver halide emulsion wherein at least one layer contains a silver chloroiodide emulsion containing at least 95 mole percent chloride and contains a sensitizing dye of the following general formula (I): ##STR1## wherein: Z1 represents a halogen, a cyano group, an amide substituted aromatic group, or a heteroaromatic group that is directly appended to the benzene ring shown or an aromatic group that is attached through an amide linking group and PA1 Z2 represents a substituted or unsubstituted alkyl group, substituted or unsubstituted alkoxy group, cyano group, a substituted or unsubstituted amide group, a substituted or unsubstituted carbamoyl group, halogen, an amide substituted aromatic group, or a heteroaromatic group that is directly appended to the benzene ring shown or an aromatic group that is attached through an amide linking group and PA1 W1 is one or more ions as needed to balance the charge on the molecule and PA1 R1 and R2 are, independently, substituted or unsubstituted alkyl group and PA1 R3 is H or a substituted or unsubstituted lower alkyl group or a substituted or unsubstituted aryl.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.