Patent ID: 7105598

Claim:
A coating composition which, when applied to a substrate and cured, provides an abrasion resistant coating on the substrate which has a refractive index, the coating composition comprising: an aqueous organic solvent mixture containing hydrolysis products and partial condensates of an epoxy functional silane, a metal oxide composite colloid, a disilane and a carboxylic acid functional compound wherein the disilane is represented by the formula (R 10 O) x R 11 3-x Si—R 12 y —SiR 13 3-x (OR 14 ) x , where x is 0, 1, 2 or 3 and v is 0 or 1, R 11 and R 13 are H or an alkyl group containing from about 1 to 10 carbon atoms, a functionalized alkyl group, an alkylene group, an aryl group, an alkylpolyether group and combinations thereof, R 10 and R 14 are H, an alkyl group containing from about 1 to 10 carbon atoms, an acetyl group, and combinations thereof, wherein if y is 1 then R 12 can be an alkylene group containing from about 1 to 12 carbon atoms, an alkylenepolyether containing from about 1 to 12 carbon atoms, an aryl group, an alkylene substituted aryl group, an alkylene group which may contain one or more olefins, or an oxygen or sulfur atom, and further wherein if x=0 then R 11 and R 13 is a chlorine or bromine atom, and wherein the carboxylic acid functional compound is selected from the group consisting of monofunctional carboxylic acids, multifunctional carboxylic acids, anhydrides, and combinations thereof, and further wherein the epoxy functional silane is present in a molar ratio to the disilane component and the metal oxide composite colloid component of from about 0.1:1 to 4:1.