US 6,162,498 A · Method for providing a metal surface with a vitreous layer

Abstract

Disclosed is a process for providing a metallic surface with a vitreous layer which is both decorative and scratch resistant and corrosion inhibiting. Said process is characterized in that a coating composition which is obtainable by a process comprising the hydrolysis and polycondensation of one or more silanes of the general formula (I) R.sub.n SiX.sub.4-n (I) wherein the groups X, the same or different from each other, are hydrolyzable groups or hydroxyl groups, the radicals R, the same or different from each other, represent hydrogen, alkyl, alkenyl or alkynyl groups having up to 12 carbon atoms and aryl, aralkyl and alkaryl groups having 6 to 10 carbon atoms, and n is 0, 1 or 2, provided that at least one silane with n=1 or 2 is employed, or oligomers derived therefrom, in the presence of a) nanoscaled SiO.sub.2 particles and/or b) at least one compound selected from the group consisting of the oxides and hydroxides of the alkali and alkaline earth metals; is applied onto said metallic surface and the resulting coating is thermally densified to form a vitreous layer.

Claims18

Dependent claims

A process for providing a metallic surface with a vitreous layer, comprising:

(a) preparing a coating composition by a process comprising hydrolyzing and polycondensing one or more silanes of the formula
R.sub.n SiX.sub.4-n,
where
each R, which may be the same or different, is hydrogen, or an optionally fluorinated alkyl, alkenyl, or alkynyl group having up to 12 carbon atoms, or an optionally fluorinated aryl, aralkyl, or alkaryl group having 6 to 10 carbon atoms,
each X, which may be the same or different, is a hydrolyzable group or a hydroxyl group, and
n is 0, 1 or 2, provided that at least one silane has n=1 or 2, or one or more oligomers derived therefrom,
in the presence of nanoscale SiO.sub.2 particles and at least one compound selected from the group consisting of the oxides and hydroxides of the alkali and alkaline earth metals,
where the ratio of total Si atoms in the one or more silanes to total alkali metal and alkaline earth metal atoms in the at least one compound selected from the group consisting of the oxides and hydroxides of the alkali and alkaline earth metals is between 20:1 and 5:1;
(b) applying the coating composition to the metallic surface to form a coating;
and
(c) thermally densifying the coating to form a transparent vitreous layer.

8 more elements

Dependencies are inferred from the claim text.

Method for providing a metal surface with a vitreous layer

Life of this patent

Method for providing a metal surface with a vitreous layer

Life of this patent

Abstract

Claims18