The present invention discloses articles containing a coating composition, as
well as methods of making and using the compositions which, when applied to a substrate
and cured, provide articles having transparent abrasion resistant coatings, wherein
the coatings have a matched refractive index to that of the substrate and can be
tailored to control the extent of tint absorption (vide infra). The coating compositions
comprise an aqueous-organic solvent mixture containing a mixture of hydrolysis
products and partial condensates of an epoxy-functional silane, a carboxylic acid
functional compound selected from the group consisting of carboxylic acids, multifunctional
carboxylic acids, anhydrides, and combinations thereof, a metal oxide composite
colloid, and a disilane. The coating compositions may further include a mixture
of hydrolysis products and partial condensates of one or more silane additives,
a colloidal silica material, and a tetrafunctional silane.