Hochgefülltes, geschäumtes Polymermaterial

摘要

The invention relates to a process for preparing filled, expanded polymer materials based on polymethacrylate. An initial solution VL consisting of 5 to 70 parts by weight of methylmethacrylate and 1 to 15 parts by weight of polymethylmethacrylate prepolymer PP is prepared into which a particle-like inorganic filler FS in amounts of 30 to 80 wt.% based on the resultant suspension is introduced, while stirring rapidly, thereby forming a suspension. Gaseous or solid carbonic acid, in fine distribution, is uniformly introduced into the initial solution or suspension, whereupon, as a result of external heating or the heat effect of the polymerisation process, preferably initiated by the Redox initiator, the carbon dioxide is expelled while the polymerisation takes place. At the end of the polymerisation, removal from the mould can be effected.