Process for preparing a silver halide emulsion
US4987062A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1989 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Jul 5, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/136
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for preparing a silver halide emulsion is disclosed, which comprises dissolving one or more substantially water-insoluble photographic additives in a solution of an organic solvent containing a surface active agent having a hydrophilic --SO.sub.3 or --OSO.sub.3 group wherein said organic solvent is an alcohol, and then adding the resulting solution to a silver halide emulsion. A small amount of a base, or small amounts of a base and an acid may optionally be present in the mixed solution of the organic solvent and the surface active agent prior to adding the one or more substantially water-insoluble photographic additives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.