UV curable abrasion-resistant coatings with improved weatherability

Claim 1

A UV curable hardcoat composition comprising by weight, (A) 1% to 60% of colloidal silica, (B) 1% to 50% of the hydrolysis product of an alkoxysilyl acrylate of the formula, ##STR2## (C) 25% to 90% of acrylate monomer consisting essentially of a mixture of 20 wt. % to 90 wt. % of hexanediol diacrylate and 10 wt. % to 80 wt. % of a monofunctional acrylate selected from the group consisting of isobornyl acrylate, cyclohexyl acrylate, and 1-adamantyl acrylate, and (D) an effective amount of a photoinitiator, where R is a C.sub.(1-13) monovalent hydrocarbon radical, R 1 is a C.sub.(1-8) alkyl radical, R 2 is a divalent C.sub.(2-8) alkylene radical, R 3 is a monovalent radical selected from hydrogen and a C.sub.(1-8) alkyl radical, a is a whole number equal to 0 or 1, b is an integer equal to 1 to 3 inclusive, c is an integer equal to 1 to 3 inclusive, and the sum of a+b+c is equal to 4.