Method of producing extruded plate-like polystyrene foam

Details Method of producing extruded plate-like polystyrene foam Method of producing extruded plate-like polystyrene foam

1982-12-16

1984-05-29

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264DIG5, 521 79, 521 98, 521146, B29D 2700

Patent

active

044514174

ABSTRACT:
In a method of producing a plate-like polystyrene resin foam which comprises extruding a molten mixture of a polystyrene resin and a volatile blowing agent from an extruder into a zone kept at a lower pressure than the inside of the extruder, the improvement wherein the volatile blowing agent is a mixture consisting of 50 to 80% by weight of dichlorodifluoromethane and 50 to 20% by weight of ethyl chloride and is present in said molten mixture in a proportion of 8 to 17 parts by weight per 100 parts by weight of the polystyrene resin.

REFERENCES:
patent: 3160688 (1964-12-01), Aykanian et al.
patent: 4020025 (1977-04-01), Zeitler et al.
patent: 4085175 (1978-04-01), Keuchel
patent: 4260572 (1981-04-01), Akiyama et al.

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