Process and lacquer for the production of scratch-resistant coatings

Claim 1

A process for the production of scratch-resistant transparent coatings, which comprises applying to a substrate, and hardening, a lacquer which has been obtained by hydrolytic precondensation of (a) at least one zirconium compound, which is soluble in the reaction medium, of the formula I: MR.sub.4 (I) in which M denotes zirconium and R represents halogen, hydroxyl, alkoxy, acyloxy or a chelating ligand; and (b) at least one organo functional silane of the formula II: R.sub.m '(R"Y).sub.n SiX.sub.(4-m-n) (II) in which R' denotes alkyl or alkenyl, R" represents alkylene or alkenylene, wherein said R' or R" radicals are uninterrupted or are interrupted by oxygen or sulfur atoms or --NH-- groups, X denotes hydrogen, halogen, hydroxyl, alkoxy, acyloxy or the group --NR"' 2 , wherein R"' is hydrogen or alkyl or one of each, Y is halogen or an unsubstituted or substituted amino, amide, aldehyde, alkylcarbonyl, carboxyl, mercapto, cyano, alkoxy, alkoxycarbonyl, sulfonic acid, phosphoric acid, acryloxy, methacryloxy, epoxy or vinyl group; m and n have the value 0, 1, 2 or 3, and m+n have the value 1, 2 or 3, with a smaller amount of water than the stoichiometrically required amount for complete hydrolysis of the hydrolyzable groups; and subsequently further condensing the reaction mixture by adding at least an amount of water required to hydrolyze the remaining hydrolyzable groups.