UV curable abrasion-resistant coatings with improved weatherability
First 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, R1 is a C.sub.(1-8) alkyl radical, R2 is a divalent C.sub.(2-8) alkylene radical, R3 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.
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Accused Products
Abstract
UV curable hardcoat compositions are provided which impart improved abrasion resistance to thermoplastic substrates when applied and cured thereon. Enhancement in abrasion and weathering properties have been achieved by the use of certain UV curable branched or carbocyclic monoacrylates, such as isobornyl acrylate.
82 Citations
5 Claims
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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, R1 is a C.sub.(1-8) alkyl radical, R2 is a divalent C.sub.(2-8) alkylene radical, R3 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.
Specification