Process for producing plate-like polystyrene resin foam

Details Process for producing plate-like polystyrene resin foam Process for producing plate-like polystyrene resin foam

1981-08-28

1983-07-12

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264177R, 264DIG13, 425325, 425817C, B29D 2700

Patent

active

043930166

ABSTRACT:
In a process for producing a plate-like polystyrene resin foam which comprises extruding a molten mixture consisting of a polystyrene resin and a volatile blowing agent by an extruder into a zone having a lower pressure than the inside of the extruder; the improvement wherein said volatile blowing agent is a mixture consisting of dichlorodifluoromethane, ethyl chloride and methyl chloride in which dichlorodifluoromethane accounts for 50 to 70% by weight of the mixture and the remainder consists of ethyl chloride and methyl chloride and the amount of ethyl chloride is at least 30% by weight based on the total amount of ethyl chloride and methyl chloride; and wherein said volatile blowing agent 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 component.

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patent: 4260572 (1981-04-01), Akiyama et al.
patent: 4308352 (1981-12-01), Knaus

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