UV-curable scratch-resistant varnish having a thickener which becomes bound in the composition of the varnish by polymerization

Abstract

A coating agent for producing scratch-resistant coatings on plastic articles, which comprises: (1) 1-30 wt. % of a prepolymer, as a thickener (IP thickener), which prepolymer is bound in the composition of the coating by polymerization; (2) 20-80 wt. % of multifunctional acrylates, multifunctional methacrylates or mixtures thereof; (3) 5-75 wt. % of a thinner; (4) 0.01-10 wt. % of a UV-initiator; (5) 0-20 wt. % of customary additives; wherein the prepolymer (1) is obtained by radical polymerization of: (a) 90-99 wt. % of C.sub.1 -C.sub.8 -alkyl esters of acrylic- or methacrylic acid; and (b) 1-10 wt. % of a sulfur-containing regulator having at least three thiol groups. The coating system is distinguished by high scratch-resistance and good weatherability.

Dependencies are inferred from the claim text.