In situ film hardening with aldehyde bisulfite and nonhardening aldehyde
AssigneeE. I. Du Pont de Nemours and Company
InventorReginald A. Booker
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Abstract
A hardened photographic film is formed as a result of in situ generation of hardener by incorporating an aldehyde bisulfite in one layer and a nonhardening aldehyde in an adjacent layer. Preferred aldehyde bisulfite is glutaraldehyde bisulfite and preferred nonhardening aldehyde is orthosulfobenzaldehyde.
Claims5
A process of forming a hardened photographic film in wich a layer comprised of silver halide dispersed in gelatin is coated on a support in contact with another layer and dried, characterized in that an aldehyde hardening agent is formed in situ by reacting an aldehyde bisulfite in one layer and a nonhardening aldehyde in an adjacent layer.
Dependencies are inferred from the claim text.