Patent ID: 6346331
Filing Date: 2002-02-12
Classification: C08G,C08K,C09D,Y10T

Abstract:
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 Bayer number of at least 5, the coating being formed by curing a coating composition comprising an aqueous-organic solvent mixture applied to the surface of the substrate and wherein the aqueous-organic solvent mixture consisting essentially of: from about 10 to about 99.9 weight percent, based on the total solids of the composition, of hydrolysis products and partial condensates of an epoxy functional silane and a tetrafunctional silane wherein the epoxy functional silane is present in a molar ratio to the tetrafunctional silane of from about 0.1:1 to about 5:1 and the solvent component of the aqueous solvent dispersion is compatible with the epoxy functional silane and the tetrafunctional silane; from about 0.1 to about 30 weight percent of a multifunctional compound, based on the total solids of the composition, wherein the multifunctional compound is selected from the group consisting of multifunctional carboxylic acids, multifunctional anhydrides and mixtures thereof; and an amount of water sufficient to hydrolyze the epoxy functional silane and the tetrafunctional silane.