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US 4,395,461 AGranted
Method for making silicon coated polycarbonates and article obtained therefrom
AssigneeGeneral Electric Company
InventorTa-Yen Ching
Life of this patent
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Abstract
A method is provided for improving the weatherability of a polycarbonate substrate by initially treating the surface of the polycarbonate substrate with a solution of a hydrolyzed silylated organic U.V. screen followed by the application of a curable silicone hardcoat composition onto the treated substrate.
Claims5
A method for making a composite of a polycarbonate substrate and a silicon hardcoat having improved weatherability which comprises,
- (1) treating a polycarbonate substrate with a solution of the hydrolysis product of a silylated organic UV screen which has been allowed to hydrolyze for a period not exceeding about three days and curing the applied hydrolyzate on the treated substrate at a temperature of from 75.degree. C. to 150.degree. C. and
- (2) applying onto the treated polycarbonate substrate a silicone hardcoat composition and thereafter heating the resulting composite to a temperature in the range of from 75.degree. C. to 150.degree. C. until the applied hardcoat composition is cured.
Dependencies are inferred from the claim text.