Method of making expandable polystyrene beads

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

1978-07-21

1979-11-13

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 57, 521 88, 521905, 521911, 521918, 528494, C08J 922

Patent

active

041744276

ABSTRACT:
Expandable-polystyrene beads suitable for use in making impervious containers are made from a recipe including 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 alkoxylated 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 expandable into impervious product containers.

REFERENCES:
patent: 3001954 (1961-09-01), Buchholtz et al.
patent: 3468820 (1969-09-01), Buchholtz et al.

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