Patent ID: 6265029
Filing Date: 2001-07-24
Classification: C08J,C09D,G02B,Y10T

Abstract:
A method for imparting improved abrasion resistance to a solid substrate, comprising the steps of:a. preparing or obtaining a liquid thermosettable hardcoating composition comprising a condensation-reaction copolymerization product of an acidic aqueous colloidal silica sol, or at least functionally equivalent solvent-based sol, or metal oxide particle suspension or metal ester or mixture therewith, with one or more monomethyltrialkoxysilanes consisting of less than 50 mole percent monomethyltrimethoxysilane and said reaction product being with an additive means of promoting cure, and at least one tail solvent, and where said hardcoating composition can be stored at room temperature for greater than 30 days without bulk gelation;b. coating said substrate with said liquid thermosettable hardcoating composition sufficient to apply 0.1-50 microns dry-film coating thickness;c. drying to remove solvent and, if present, water; andd. curing the coating.