Patent ID: 7014918

Claim:
An article comprising: a substrate; and a substantially transparent abrasion-resistant coating formed on at least one surface of the substrate, the coating having a refractive index substantially corresponding to a refractive index of the substrate and being formed by curing a coating composition, 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 dlsilane 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 y is 0 or 1, R 10 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 12 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 sliane 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.