초록 ▼

A pigment-free coating composition comprising an acidic dispersion of colloidal titania, colloidal silica and hydroxylated silsesquioxane in an alcohol-water medium. A coating of the composition cured on a plastic substrate such as polycarbonate results in a hard, abrasion-resistant protective coati

A pigment-free coating composition comprising an acidic dispersion of colloidal titania, colloidal silica and hydroxylated silsesquioxane in an alcohol-water medium. A coating of the composition cured on a plastic substrate such as polycarbonate results in a hard, abrasion-resistant protective coating. Such coatings transmit visible light, but absorb wavelengths of ultraviolet light which cause degradation of the substrate surface and resultant adhesion-loss of the protective coating upon weathering. A cured coating of these compositions deposited on metal substrates such as aluminum results in a hard, abrasion resistant coating which offers slightly more corrosion protection than such a composition without colloidal titania.

대표청구항 ▼

A composition of matter comprising a dispersion of colloidal silica and colloidal titania, said colloidal particles having a particle size falling in the range of 5 to 150 millimicrons, in a water-alcohol solution of the partial condensate of a silanol having the formula RSi(OH)3 in which R is selec

A composition of matter comprising a dispersion of colloidal silica and colloidal titania, said colloidal particles having a particle size falling in the range of 5 to 150 millimicrons, in a water-alcohol solution of the partial condensate of a silanol having the formula RSi(OH)3 in which R is selected from the group consisting of alkyl radicals of 1 to 3 inclusive carbon atoms, the gammachloropropyl radical, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gammaglycidoxypropyl radical, the gammamethacryloxypropyl radical, the gammamercaptopropyl radical and the phenyl radical, at least 70 weight percent of the silanol being CH3Si(OH)3, said composition containing 5 to 50 weight percent solids, said solids consisting essentially of 1 to 10 weight percent of said colloidal titania, 20 to 56 weight percent colloidal silica and 34 to 79 weight percent of said partial condensate, said composition containing sufficient acid to provide a pH in the range of 2.0 to 6.0. An article comprising a solid substrate coated with the composition of claim 1 and then cured.