Patent ID: 6538092
Filing Date: 2003-03-25
Classification: C08K,C09D,G02B

Abstract:
A coating composition which, when applied to a substrate and cured, provides an abrasion resistant coating on the substrate and has a refractive index, comprising:an aqueous organic solvent mixture containing hydrolysis products and partial condensates of an epoxy functional silane, a colloidal silica material, a metal oxide composite colloid, a tetrafunctional silane, and a carboxylic acid functional compound, wherein the carboxylic acid functional compound is selected from the group consisting of monofunctional carboxylic acids, multifunctional carboxylic acids, anhydrides, and combinations thereof, the epoxy functional silane is present in a molar ratio to the colloidal silica component, the tetrafunctional silane component, and the metal oxide composite colloid component of from about 0.05:1 to 2:1 and the molar ratio of the colloidal silica component and the tetrafunctional silane component to the metal oxide composite colloid component is from about 0.01:1 to about 50:1; and an effective amount of a leveling agent thereby spreading the aqueous-organic solvent mixture on the substrate to provide substantially uniform contact of the aqueous-organic solvent mixture with the substrate.