Chemische Werke Huls Aktiengesellschaft

Chemische Werhe Huls Ag

Werner Bollmann

Josef K Rigler

Horst Leithauser

Karl Trukenbrod

Wolfgang Schafer

Wilhelm Mollenbruck

Small particulate expandable styrene polymer molding compositions are prevented from acquiring static charges by coating with betaines.

Small particulate expandable styrene polymer molding compositions

A process for producing foam-shaped pieces having a poreless and smooth surface from particulate expandable styrene polymer which comprises the steps of heating not prefoamed particles of expandable styrene polymer to a temperature between 100.degree. and 170.degree. C. under a pressure of between 3 and 30 bar to cause melting of the polymer cooling the melt polymer to temperatures of about 10.degree. to 40.degree. C. above the softening point of the styrene polymer, enlarging the capacity of the mold in which the particles are melted, expanding the resulting mold melt material without supplementary external delivery of heat and thereafter cooling the mold to about ambient temperature followed by removal of the shaped foamed piece.

Process for production of foamed shaped pieces with poreless surface

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Marl, Germany

Werner Bollmann