Silyl-polyacrylates for polycarbonate substrates
AssigneeGeneral Electric Company
InventorDaniel R. Olson
Life of this patent
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Abstract
Heat curable hard coat compositions are provided of aqueous colloidal silica and copolymer of an alkylacrylate and a polyalkoxysilylacrylate or a mixture of an alkylacrylate-acrylic acid copolymer and an epoxyalkoxysilane. The heat curable hardcoat composition can be applied onto various substrates, for example, a polycarbonate substrate, and thereafter heat cured to produce coated articles having adherent and abrasion resistant coatings.
Claims14
Heat curable hardcoat compositions comprising the product obtained by mixing together the following essential ingredients by weight,
- (A) 20 to 80% of colloidal silica utilized as an aqueous dispersion having at least 10% by weight of colloidal silica solids,
- (B) 80 to 20% of a silyl-containing polyacrylate selected from the class consisting of
- (i) an alkylacrylate-acryloxyalkyl polyalkoxysilane copolymer and
- (ii) a mixture of a carboxy containing polyalkylacrylate and an epoxy silane and
- (C) 1% to 20% of a UV absorber, based on the weight of (A), (B) and (C).
A method of improving the abrasion resistance of a thermoplastic substrate which comprises
- (1) treating the surface of the thermoplastic substrate with a heat curable hardcoat composition and
- (2) heating the treated substrate to a temperature in the range of from 85.degree. C. to 140.degree. C., where the heat curable hardcoat composition comprises by weight,
- (A) 20 to 80% of colloidal silica,
- (B) 80 to 20% of a silyl-containing acrylate selected from the class consisting of
- (i) an alkylacrylate-acryloxyalkyl polyalkoxysilane copolymer or
- (ii) a mixture of alkylacrylateacrylic acid copolymer and a glycidoxyalkylpolyalkoxysilane
- (C) 1% to 20% of a UV absorber, based on the weight of (A), (B), and (C).
Dependencies are inferred from the claim text.