Process of preparing a reduced dispersity tabular grain emulsion

Details Process of preparing a reduced dispersity tabular grain emulsion Process of preparing a reduced dispersity tabular grain emulsion

1991-05-14

1992-12-15

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430937, G03C 1015

Patent

active

051716593

ABSTRACT:
A process is disclosed of preparing a photographic emulsion containing tabular silver halide grains exhibiting a reduced degree of total grain dispersity. After forming a population of silver halide grain nuclei containing parallel twin planes, ripening out a portion of the silver halide grain nuclei. The silver halide grain nuclei containing parallel twin planes remaining are then grown to form tabular silver halide grains. The total grain dispersity of the emulsion is reduced by incorporating bromide ion in the dispersing medium prior to forming the silver halide grain nuclei and, at the time parallel twin planes are formed in the silver halide grain nuclei, a polyalkylene oxide block copolymer surfactant containing terminal hydrophilic alkylene oxide block units linked by a lipophilic alkylene oxide block unit accounting for at least 4 percent of the molecular weight of the copolymer.

REFERENCES:
patent: 4434226 (1984-02-01), Wilgus et al.
patent: 4452882 (1984-06-01), Akimura et al.
patent: 4477565 (1984-10-01), Himmelwright
patent: 4722886 (1988-02-01), Nottorf
patent: 4797354 (1989-01-01), Saitou et al.
Research Disclosure, vol. 232, Aug. 1983, Item 23212 (Mignot French Patent 2,534,036, corresponding).
Research Disclosure, vol. 253, May 1985, Item 25330.

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