Photothermographic imaging materials and antifoggants therefor
US5939248A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1993 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Sep 24, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/49845
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photothermographic material having a photosensitive medium comprising: photosensitive silver halide, a reducible silver source, a reducing agent for silver ion, a hydrobromic acid salt of a nitrogen-containing heterocyclic ring or fused ring nucleus associated with a pair of bromine atoms CHARACTERIZED IN THAT the photosensitive medium additionally comprises as an antifoggant, substantially in the absence of an antifoggant effective amount of mercury and other heavy metal salts, a tribromomethyl ketone compound of general formula (I): ##STR1## in which; R represents an alkyl group, an aryl group, a carbocyclic ring or fused ring nucleus or a heterocyclic ring or fused ring nucleus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.