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.

Abstract: Polymethacrylimide polymers poor in amide or N-alkylamide groups and in carboxyl and carbonic acid anhydride groups are obtained by heating a copolymer consisting of 1 to 60 mol percent of methacrylamide or/and an N-alkyl-methacrylamide and 40-99 mol percent of an alkyl methacrylate or/and phenyl methacrylate in an aliphatic monoalcohol.

Abstract: In a process for imidizing an alkyl methacrylate polymer by reaction with a nitrogen-containing imidizing agent, the formation of carboxyl and anhydride groups is suppressed when a portion of the imidizing agent is added only after the previously added imidizing agent has been reacted at least partially, and particularly when the reaction with the imidizing agent is terminated before the polymer has been completely imidized.

Abstract: The invention relates to a coating composition, a method of coating molded articles with the coating composition, and the molded articles so coated, particularly molded articles comprised of thermoplastic or thermoelastic plastics. The coating, in the form of a cured thin layer, is particularly optically clear, scratch-resistant, and weather-resistant. It is produced on the plastic substrate material by polymerization of a layer of flowable coating comprised of the coating material, which layer contains polyfunctional (meth)acrylic monomers, and said layer further contains, as a "leveling" agent, fluoroalkyl (meth)acrylates of formula I ##STR1## where R.sub.1 represents H or CH.sub.3, and R.sub.2 represents a fluorine-containing alkyl group with 2-20 C atoms.