Robust process for preparing high Br low COV tabular grain emuls

Details Robust process for preparing high Br low COV tabular grain emuls Robust process for preparing high Br low COV tabular grain emuls

1997-01-24

1998-06-09

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430637, G03C 1043, G03C 1015, G03C 1035

Patent

active

057631514

ABSTRACT:
A process is disclosed of preparing a photographic emulsion comprised of high bromide silver halide tabular grains accounting for greater than 90 percent of total grain projected area. The grains exhibit a low level of size dispersity by reason of forming in the presence of a dispersing medium containing a polyalkylene oxide block copolymer surfactant a population of silver halide grain nuclei containing twin planes, the halide content of the grain nuclei consisting essentially of silver bromide, and growing the silver halide grain nuclei containing twin planes to form the tabular silver halide grains. Inadvertent variation in tabular grain sizes and thicknesses from one precipitation to the next are minimized by growing the silver halide grain nuclei at a pH in the range of from 3.0 to 8.0 and in the presence of at least a 0.01M concentration of a partially dissociated acid having a pKa that is within 2.5 units of the pH and that forms a silver salt more soluble than the silver halide incorporated in the grains.

REFERENCES:
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patent: 5147772 (1992-09-01), Tsaur et al.
patent: 5147773 (1992-09-01), Tsaur et al.
patent: 5171659 (1992-12-01), Tsaur et al.
patent: 5236817 (1993-08-01), Kim et al.
patent: 5252453 (1993-10-01), Tsaur et al.
patent: 5272048 (1993-12-01), Kim et al.
patent: 5476760 (1995-12-01), Fenton et al.

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