Process for the preparation of silver halide emulsions

Details Process for the preparation of silver halide emulsions Process for the preparation of silver halide emulsions

1993-09-24

1995-06-27

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430600, 430613, 430614, G03C 1005, G03C 1015, G03C 1035

Patent

active

054279046

ABSTRACT:
Emulsions having an improved sensitivity/grain ratio are obtained when a silver halide emulsion containing up to 20 mol % of AgI is prepared by the precipitation of a silver halide emulsion A containing up to 100 mol % of AgI and the addition of a silver halide emulsion B which contains up to 40 mol % of AgI, has an average grain size of at most 0.25 .mu.m and is always more soluble in aqueous gelatine solution than emulsion A either due to its grain size or due to its iodide content, this being carried out in the presence of at least two compounds selected from imidazole, histidine (.alpha.-amino-.beta.-imidazolyl-(5)-propionic acid) and other monocyclic, 5- or 6-membered heterocyclic compounds which have at least one ring nitrogen atom, are free from SH groups and form sparingly soluble silver salts in weak acid to neutral aqueous solutions, which salts redissolve at pH>9 when ammonia is added, one of the at least two compounds being imidazole or histidine and at least one other compound being a compound other than imidazole or histidine.

REFERENCES:
patent: 2146938 (1939-02-01), Claus
patent: 3206313 (1965-09-01), Porter et al.
patent: 3317322 (1967-05-01), Porter et al.
patent: 4298683 (1981-11-01), Becker et al.
patent: 4379837 (1983-04-01), Lapp et al.
patent: 5273871 (1993-12-01), Takada et al.
Report by D. Markocki and W. Romer in "Korpuskular Photographie", IV (1963), p. 149 et seq.
"Zhurnal Nauchnoi Prikladnoi Fotografi Kinematografi 5", No. 2 (1960), pp. 81-83 (translation).

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