Method for the preparation of an improved photographic tabular e

Details Method for the preparation of an improved photographic tabular e Method for the preparation of an improved photographic tabular e

1997-10-23

1999-03-23

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430642, 430966, G03C 1035, G03C 1005, G03C 1047

Patent

active

058857630

ABSTRACT:
A method is disclosed of preparing of a photographic silver halide emulsion comprising precipitating in one or more precipitation steps in a reaction vessel, followed by desalting by means of flocculation and washing or by means of ultrafiltration, said emulsion comprising gelatin as a binder and {100} tabular silver halide grains containing at least 50 mole % of chloride, wherein at least 40% by number of all grains is provided by said tabular grains, and wherein said tabular grains exhibit an average aspect ratio of at least 2, an average thickness of at most 0.5 .mu.m, and an average equivalent circular crystal diameter of 0.3 .mu.m or more, characterized in that during said precipitation step(s) said gelatin binder present in said reaction vessel is substantially free of calcium ions and is oxidized to a degree in order to have a methionine content of at most 4000 ppm.

REFERENCES:
patent: 5356764 (1994-10-01), Szajewski et al.
patent: 5413904 (1995-05-01), Chang et al.
patent: 5587281 (1996-12-01), Saitou et al.
patent: 5663041 (1997-09-01), Chang et al.

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