Method of preparing a monosize silver halide emulsion involving

Details Method of preparing a monosize silver halide emulsion involving Method of preparing a monosize silver halide emulsion involving

1975-08-04

1978-01-10

Klein, David

Gas separation: apparatus

Electric field separation apparatus

Electrode retaining or supporting means

961147, G03C 102

Patent

active

040677397

ABSTRACT:
A method of preparing a monosize silver halide emulsion of which most of the silver halide crystals are of the twinned octahedral type is provided. An aqueous solution of a silver salt and an aqueous solution of an alkali metal or ammonium halide in an aqueous dispersing medium containing a protective colloid are mixed at such concentration that the silver halide is nucleated, causing the silver halide nuclei to increase in size in the presence of a silver halide solvent by Ostwald ripening to produce a population of twinned octahedral seed crystals. Then the maximum rate of addition of silver salt and alkali metal or ammonium halide which is possible without renucleation occurring and the minimum rate of addition of silver salt and alkali metal or ammonium halide which is possible without Ostwald ripening occurring is determined and the seed crystals are caused to grow by adding to the aqueous dispersing medium aqueous silver salt solution and aqueous alkali metal or ammonium halide solution at a rate between the predetermined maximum and minimum rates and then at intervals the maximum and minimum addition rates are re-determined and the addition rates of silver and halide are adjusted to ensure that at all times during the crystal growth stage neither renucleation nor Ostwald ripening occurs, the p Br of the liquid phase being maintained above 0.15 during the whole crystal growth stage. The silver halide emulsions are useful for preparing photographic material.

REFERENCES:
patent: 3650757 (1972-03-01), Irie et al.
patent: 3655394 (1972-04-01), Illingworth
patent: 3736144 (1973-05-01), Nagae et al.
patent: 3773516 (1973-11-01), Gutoff
patent: 3790387 (1974-02-01), Musliner
patent: 3817756 (1974-06-01), Claes et al.
patent: 3885970 (1975-05-01), Miyahara

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