Silver halide emulsion, method of preparing the same, and silver halide color photographic photosensitive material and image-forming method using the emulsion
US7258969B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2006 |
| Grant date | Aug 21, 2007 |
| Priority date | — |
| Expiry date | Mar 28, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/39
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A silver halide emulsion which exhibits high sensitivity, high contrast, little sensitivity variation with humidity conditions at the time of exposure, and excellent reciprocity law properties at high illumination intensities. Also, a method of preparing the emulsion in a stable manner, and a silver halide color photographic photosensitive material and an image forming method that use the emulsion. The emulsion includes a mesoionic compound having a thiolate structure or a protonated thiolate structure, and the emulsion is sensitized by an Au (III) compound. The emulsion preferably contains an oxidatively dimerized form of a mesoionic compound having a thiolate structure, and a silver chloride content of at least 90 mol %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.