Silver halide photographic emulsions
US4469783A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1983 |
| Grant date | Sep 4, 1984 |
| Priority date | — |
| Expiry date | Jun 3, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/015
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A silver halide photographic emulsion is described, which has halogen composition comprises at least 60 mole % of silver chloride, 40 mole % or less of silver bromide, and 5 mole % or less of silver bromide. Grain formation is performed in the presence of a silver halide solvent selected from the group consisting of tetrasubstituted thioureas and organic thioethers, and from 10.sup.-8 to 10.sup.-5 mole of a water-soluble iridium compound per mole of silver halide. This photographic emulsion exhibits high sensitivity and provides high contrast even by flash exposure. Thus, it is useful for the production of light-sensitive materials to be used in the production of printing plates in accordance with photographic engraving.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.