Rohm Gmbh

Roehm Gmbh Chemische Fabrik

Manfred Brehm

Heinz Vetter

Werner Hoess

Guenter Schroeder

Volker Kerscher

Thomas Rhein

Wolfgang Scharnke

Rolf Neeb

Norbert Rau

Roland Reiner

Hartwig Droegemueller

A coating agent for producing scratch-resistant coatings on plastic articles, which comprises:

UV-curable scratch-resistant varnish having a thickener which becomes

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.

Method for making polymethacrylimide polymers

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.

Method for imidizing an alkyl methacrylate polymer

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Aschaffenburg, Germany

Manfred Brehm