Process for the production of an abrasion resistant optical element
AssigneeAmerican Optical Corporation
InventorAlbert R. LeBoeuf
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Abstract
A process for preparing an abrasion resistant allyl diglycol carbonate lens is provided. The allyl diglycol carbonate lens prepared by the process of the invention has an abrasion resistant coating thereon comprised of a transparent base of a hydrolyzed polysilicic acid ester and polyvinyl alcohol comprising 90 to 100% hydrolyzed polyvinyl acetate.
Claims10
An allyl diglycol carbonate lens having a transparent abrasion resistant coating upon at least one surface obtained by (1) hydrolyzing said surface of said lens in an aqueous alkaline solution;
- (2) coating said lens with an aqueous coating composition comprising a mixture of an acid polysilicic ester of an alcohol containing from 1 to 12 carbon atoms and having up to four silicic acid ester groups per silicon atom, and a polyvinyl alcohol comprising 90% to 100% hydrolyzed polyvinyl acetate;
- and (3) drying and curing said coating at an elevated temperature.
A process for coating an allyl diglycol carbonate lens comprising steps of (1) treating at least one surface of said lens with an aqueous alkaline solution to hydrolyze said surface;
- (2) applying on said treated surface an aqueous coating composition comprising a mixture of an acid polysilicic ester of an alcohol containing from 1 to 12 carbon atoms and having up to four silicic acid ester groups per silicon atom, and a polyvinyl alcohol comprising 90% to 100% hydrolyzed polyvinyl acetate;
- and (3) drying and curing said coating composition at an elevated temperature.
Dependencies are inferred from the claim text.