Photothermographic photosensitive material
US5968725A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Apr 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2001/108
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photothermographic material comprising a photosensitive silver halide, an organic silver salt, a reducing agent, and an ultrahigh contrast promoting agent, typically a hydrazine derivative. In one embodiment, a compound having a group for promoting adsorption to the silver halide is contained for suppressing occurrence of pepper fog. In another embodiment, a 5- or 6-membered heterocyclic mercapto compound having at least two nitrogen atoms or a tetraazaindene compound is contained for suppressing a change of photographic properties, typically image enlargement with a variation of developing conditions. In either case, the photothermographic material can form super-high contrast images of quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.