Process for producing polystyrene resin foam

Details Process for producing polystyrene resin foam Process for producing polystyrene resin foam

1991-12-27

1992-09-22

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 521 97, 521146, 521908, C08J 914

Patent

active

051497212

ABSTRACT:
A process for producing a polystyrene resin foam is disclosed, which comprises supplying an extruding machine with a polystyrene resin, a fine inorganic powder and a highly volatile foaming agent, heating them to melt, and extruding the melt from the nozzle into a zone of the lower pressure, wherein 0.01 to 2 parts by weight of an alcoholic ester of a higher fatty acid is added to 100 parts by weight of the polystyrene resin. The process insures that foams having a skin of good aesthetic appeal that are free from staining and malodor can be produced consistently for a prolonged time without any fire hazard.

REFERENCES:
patent: 2989782 (1961-06-01), Barkhuff, Jr. et al.
patent: 3480570 (1969-11-01), Roberts et al.
patent: 3789028 (1974-01-01), Heiskel et al.
patent: 4042541 (1977-08-01), Watts
patent: 4125490 (1978-11-01), Hettinga
patent: 4238570 (1980-12-01), Shibata et al.
patent: 4520136 (1985-05-01), Schwarz

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