Method of preparing silver halide emulsion containing homogeneous and thin tabular crystals
US6214532A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1999 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Dec 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/43
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Method of preparing a photosensitive element containing a silver halide emulsion with homogeneous and thin tabular crystals, comprising the steps of: PA1 (1) forming silver halide nuclei by simultaneously adding an aqueous silver salt and a halide salt solution to a reaction vessel (a), containing an aqueous solution of a protective colloid, PA1 (2) transfering the dispersion of silver halide nuclei formed in vessel (a) to a mixing chaiber (b) and diluting said dispersion, PA1 (3) growing in a growth chamber (c) said nuclei of the diluted dispersion by adding and mixing an aqueous silver salt and a halide salt solution and collecting the grown crystals in reaction vessel (a) which is a part of a closed circuitry together with the mixing and growth chambers (b) and (c), PA1 (4) transfering said silver halide crystal dispersion to mixing chamber (b) and diluting the dispersion, PA1 (5) further growing the silver halide crystals in growth chamber (c) and collecting the silver halide crystals in reaction vessel a), PA1 (6) concentrating the emulsion of silver halide crystals simultaneously with the step of growing in order to keep the emulsion level in reaction vessel (a) controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.