Preparation method of morphologically homogeneous (111) tabular

Details Preparation method of morphologically homogeneous (111) tabular Preparation method of morphologically homogeneous (111) tabular

1998-10-09

2000-07-11

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430569, 430642, G03C 1015, G03C 1035, G03C 1047, G03C 1005

Patent

active

060870850

ABSTRACT:
A method is disclosed for preparing an emulsion having grains rich in silver bromide in the presence of gelatin as a protective colloid in a reaction vessel wherein a yield of more than 250 g of precipitated silver nitrate per liter of reaction vessel mixture is attained, wherein at least 70% of a total projected area of all grains is provided by {111} tabular grains having an average aspect ratio of more than 2:1 and an average thickness of from 0.05 up to 0.30 .mu.m and wherein a ratio by number of percentage amounts of hexagonal tabular grains to triangular tabular crystals present is more than 10:1, said method comprising following steps:

REFERENCES:
patent: 5567580 (1996-10-01), Fenton et al.
patent: 5723278 (1998-03-01), Jagannathan et al.

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