Silicone coated abrasion resistant polycarbonate article

Claim 1

A process for providing a polycarbonate substrate with an abrasion and chemical solvent resistant thermoset organopolysiloxane coating consisting essentially of: (i) priming at least one surface of said substrate by applying onto said surface a primer composition consisting essentially of a thermoplastic acrylic polymer containing functional groups, said functional groups being selected from the group consisting of hydroxyl, carboxyl, amine, epoxide, amide, --SH, --SO 3 H, --COOR, --Si(OR 1 ) 3 , and mixtures thereof wherein R and R 1 are alkyl radicals containing from 1 to about 20 carbon atoms, and a solvent for said acrylic polymer; (ii) evaporating off the solvent from said primer composition thereby forming a solid primer layer consisting essentially of a thermoplastic acrylic polymer containing functional groups; (iii) applying onto the primer layer a top coat composition consisting of a solvent-soluble further-curable organopolysiloxane and a solvent therefor; (iv) evaporating off a substantial amount of the solvent in the top-coat composition; and (v) curing said further-curable organopolysiloxane thereby forming a hard, abrasion and chemical solvent resistant top-coat consisting of a thermoset organopolysiloxane which is tenaciously and durably adhered to the polycarbonate substrate.