Method of preparing light-sensitive silver halide emulsions and

Details Method of preparing light-sensitive silver halide emulsions and Method of preparing light-sensitive silver halide emulsions and

1995-08-31

1997-05-06

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430641, G03C 1015

Patent

active

056270194

ABSTRACT:
A method is provided of preparing a light-sensitive silver halide emulsion or a dispersion of a photographically useful compound comprising the steps of precipitating silver halide or photographically useful compound in the presence of colloidal silica serving as a protective colloid, coagulation washing the precipitate formed and redispersing the silver halide or the photographically useful compound, characterised in that the coagulation takes place in the presence of hydroxy ethyl cellulose as, e.g., hydroxy ethyl cellulose, hydroxy propyl cellulose, methyl cellulose etc., as a polymer capable of forming hydrogen bridges with the silica, in an amount sufficient to form coagulable aggregates with the silica particles.

REFERENCES:
patent: 5380634 (1995-01-01), Kiekens et al.
patent: 5476761 (1995-12-01), Verbeeck et al.
patent: 5478709 (1995-12-01), Kiekens et al.
F. Csempesz et al., Magy. Kem. Foly. (1979), 85(3), 140-4; English language Chemical Abstract 1979.

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