Abstract
AbstractIt has long been recognized that the solubility and coagulation characteristics of chemically modified gelatins can be exploited by emulsion manufacturers for the purpose of washing and concentrating silver halide emulsions. In order to study these characteristics, it has generally been necessary to precipitate silver halide grains in the presence of the chemically modified gelatin to provide a substrate for the coagulation. A more convenient test system has been developed that uses a readily available material (barium sulphate) to mimic silver halide grains and provide a reproducible substrate for coagulation. This test system has been used to study various aspects of the coagulation process and their relationship to properties of phthalic anhydride (PA) modified gelatins. The coagulation properties (or solubilities) of PA gelatins were found to be a non-linear function of the degree of modification. Molecular weight distribution was found to be a secondary factor in solubility.
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