Process for producing a thermoplastic polymeric foam.

摘要: Thermoplastic foams are produced by mixing the plastic, such as polymethyl methacrylate or a polymethacrylalkylimide polymer, with magnesium hydroxide and/or aluminium silicic acid blowing agent in melt and heating mixture until it expands cooling foam to below softening point. If necessary, is heated under pressure expanded decompression.