Patent ID: 6506496
Filing Date: 2003-01-14
Classification: C03C,G02B,Y10T

Abstract:
A coated substrate comprising a substrate of organic glass or mineral glass material, having a coating which is hydrophobic, oleophobic and resistant to abrasion, wherein the coating is obtained, from a composition comprising a hydrolyzate obtained from a solution, by a method comprising the steps:hydrolyzing and partially condensing one or more epoxidized alkoxysilanes and a non-epoxidized silane; adding, separately or simultaneously, colloidal silica and a catalyst; and adding one or more fluorinated alkylsilanes, present in an amount of from 0.1-6.0 wt % based on total dry matter in the solution, during the hydrolysis or partial condensation of the silanes or during both the hydrolysis and partial condensation of the silanes; wherein the fluorinated alkylsilane is perfluoroalkylsilane having the formula (I): CF3â€”(CF2)nâ€”(CH2)mâ€”Si(OR)3â€ƒâ€ƒ(I) â€ƒwherein n is 5-12, m is 2-5, and R represents a methyl, ethyl, or propyl group, eliminating essentially all organic contaminants adsorbed on the surface of the substrate, depositing said composition on said substrate, evaporating solvents from said composition to thereby form a gel, and crosslinking said gel, and wherein the solution has a viscosity in the range of 1-6 cps.