Method for producing silver halide emulsion
US5756277A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1995 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Dec 28, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/33
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for producing a silver halide emulsion comprising high silver chloride tabular grains each having a chloride content of 50 mol % or more and having a major plane comprising a (111) face, which comprises a step for conducting nucleation of said grains substantially in the absence of a crystal phase controlling agent to form grains which have two twin planes parallel with each other and of which most of the surface are (100) faces, a step for ripening said grains by adding a crystal phase controlling agent which adsorbs to the (111) face or a mixture of a crystal phase controlling agent which adsorbs to the (111) face and a protective colloid to reduce the ratio of grains other than the grains having two or more parallel twin planes and then a step for growing with remaining tabular grains having a major plane mainly comprising a (111) face to form tabular grains having a major plane comprising a (111) face.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.