Method of making expandable polystyrene beads

Details Method of making expandable polystyrene beads Method of making expandable polystyrene beads

C - Chemistry, Metallurgy

08

J

403/66, 403/80

C08J 9/16 (2006.01) C08J 9/22 (2006.01) C08L 25/06 (2006.01)

Patent

CA 1118150

METHOD OF MAKING EXPANDABLE POLYSTYRENE BEADS Abstract of the Disclosure Expandable-polystyrene beads suitable for use in making impervious containers are made from a recipe in- cluding styrene, free-radical initiator and polyvinyl pyrrolidone, and this practice includes a step of washing the beads in a warm aqueous solution to which an alkoxy- lated nonionic surfactant having 70-90 percent of its molecular weight accounted for by oxyethylene units is added in an amount effective to cause the washing to remove contaminating grafted polyvinyl pyrrolidone from the surface of the beads and cause them to become expand- able into impervious product containers.

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