Process for the preparation of high aspect ratio silver bromoiod

Details Process for the preparation of high aspect ratio silver bromoiod Process for the preparation of high aspect ratio silver bromoiod

1982-09-30

1983-11-08

Downey, Mary F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430569, G03C 102

Patent

active

044143109

ABSTRACT:
A process is disclosed of preparing radiation-sensitive tabular grain silver bromoiodide emulsions. This is achieved by providing in a reaction vessel an emulsion comprising a dispersing medium and high iodide silver halide grains. The mean diameter of the silver halide grains is less than 0.1 micron, and the concentration of iodide is less than 10.sup.-2 mole per liter of the emulsion. Upon concurrently running into the reaction vessel silver and bromide, a high aspect ratio tabular grain silver bromoiodide emulsion is obtained.

REFERENCES:
patent: 4063951 (1977-12-01), Bogg
patent: 4067739 (1978-01-01), Lewis
patent: 4150994 (1979-04-01), Maternaghan
patent: 4184877 (1980-01-01), Maternaghan
patent: 4184878 (1980-01-01), Maternaghan
deCugnac and Chateau, "Evolution of the Morphology of Silver Bromide Crystals During Physical Ripening", Science et Industries Photographiques, vol. 33, No. 2 (1962) pp. 121-125.
Duffin, Photographic Emulsion Chemistry, Focal Press, 1966 pp. 66-72.
Trivelli and Smith, "The Effect of Silver Iodide Upon the Structure of Bromo-Iodide Precipitation Series", The Photographic Journal, vol. LXXX, Jul. 1940, pp. 285-288.

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