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US 4,060,419 AGranted
Method of forming silver halide grains by electrolysis
AssigneePolaroid Corporation
InventorsArthur M. Gerber, Vivian K. Walworth
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Abstract
Photosensitive silver halide emulsions are prepared by the precipitation of silver halide grains from silver and halide ions generated by electrolysis.
Claims34
A method which comprises the electrolytic generation of silver ions and halide ions employing a silver anode and a cathode which is a source of halide ions and precipitation in the electrolyte of the ion pairs remove from the electrodes to provide photosensitive silver halide grains in the substantial absence of counterions in said electrolyte.
A method for forming a photographic silver halide emulsion layer which comprises the steps of:
- a. the substantially simultaneous generation of silver ions and halide ions in a solution of an electrolyte by electrolysis, employing a silver anode and a cathode which is a source of halide ions;
- b. precipitating the ion pairs remote from said anode and cathode to provide silver halide grains in the substantial absence of counterions in said electrolyte;
- c. growing said grains to a predetermined size;
- d. photographically sensitizing said grains;
- e. disposing said grains in a polymeric binder material;
- and
- f. coating said binder and said grains on a support.
4 more elements
Dependencies are inferred from the claim text.