Silver halide photosensitive materials containing thiourea and analogue compounds
US4810626A · kind A · utility
19Cited by
6References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1988 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Mar 29, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/09
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A photographic silver halide emulsion comprising a 1,1,3,3-tetrasubstituted middle chalcogen urea compound is described wherein at least one substituent comprises a nucleophilic center. The urea compound is an effective chemical sensitizing agent. A process for chemically sensitizing silver halide is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.