Basf Aktiengesellschaft

Dietmar Wittenberg

Klaus Hahn

Uwe Guhr

Hans Hintz

Peter Gleich

Michael Riethues

Michael P O'Callaghan, Deceased

Heat distortion resistant, expandable styrene polymers having a high

Expandable styrene polymers

Expandable molding compositions having high heat distortion resistance and containing from 80 to 99% by weight of a styrene polymer, 1 to 20% by weight of poly-1,4-phenylene sulfide, from 1 to 10% by weight of a C.sub.3 -C.sub.6 -hydrocarbon as blowing agent and, if desired, customary additives, are obtained by suspension polymerization of a solution of the polyphenylene sulfide in styrene.

Expandable molding compositions having high heat distortion resistance,

Flame-resistant, expandable styrene polymers containing a styrene (co)polymer, from 0.4 to 6% by weight of hexabromocyclododecane having a mean particle size of from 1 to 50 .mu.m, the particles being provided with a firm coating which has a thickness of from 1/100 to 1/10 of the particle diameter and is insoluble in water and styrene, from 1 to 10% by weight of a C.sub.3 - to C.sub.6 -hydrocarbon as blowing agent, and, if desired, customary additives, are distinguished by a reduced internal water content and can be processed to form foams which have an improved foam structure and high UV stability.

Flame resistant, expandable styrene polymers and foams, and flame

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Mannheim, Germany

Dietmar Wittenberg