Pre-expanded plastic beads based on poly-para- methylstyrene

Details Pre-expanded plastic beads based on poly-para- methylstyrene Pre-expanded plastic beads based on poly-para- methylstyrene

C - Chemistry, Metallurgy

08

J

403/72, 403/80

C08J 9/16 (2006.01) C08F 12/12 (2006.01) C08J 9/20 (2006.01) C08L 25/04 (2006.01)

Patent

CA 1193800

Abstract of the Disclosure The invention relates to pre-expanded plastic beads based on poly-para-methylstyrene with the following properties: (a) the bead size lies between 0.2 and 3 cm, (b) the thermal stability, measured in accordance with DIN 53,424 is above 110°C, and (c) the bulk density is below 35 g/l. The corresponding expandable plastic beads are prepared through the polymerization of para-methylstyrene in an aqueous suspension with the addition of volatile organic blowing agents during or after polymerization, whereby polymerization occurs in the presence of molecular-weight- regulating substances. Typical molecular-weight-regulating substances are organic chain transfer agents with a transfer constant K between 0.1 and 50, said agents being added in amounts ranging from 0.1 percent by weight to 1 percent by weight when a yield ranging from 20 to 95 percent is reached. Oligomers of the styrene or para-methylstyrene in quantities from 0.1 percent by weight to 10 percent by weight may also be employed.

436904

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