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US 4,391,903 AGranted
Ionic copolymers in photographic light-sensitive silver halide films
AssigneeE. I. Du Pont de Nemours and Company
InventorPeter K. Sysak
Life of this patent
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Abstract
Ionic copolymers of styrene sulfonic acid and maleic acid improve covering power when added to the gelatin binder employed in medical silver halide X-ray emulsions.
Claims5
A photographic film comprising a silver halide emulsion layer superimposed on a support, characterized in that the binder component of the silver halide emulsion layer consists essentially of a major amount in parts by weight of gelatin and a minor amount in parts by weight of a poly(styrene sulfonic acid-co-maleic acid) salt of the formula:
- ##STR3## wherein M is an alkali metal, m=1-3, n=1, and x=5-50.
Dependencies are inferred from the claim text.