Process for producing polystyrene foam

Details Process for producing polystyrene foam Process for producing polystyrene foam

1992-06-01

1993-06-08

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 91, 521 92, 521 98, 521139, C08J 9224, C08J 914

Patent

active

052180069

ABSTRACT:
The present invention relates to a process to produce polystyrene foam comprising mixing a predetermined amount of masterbatch mix and a styrenic polymer, heating this mixture, injecting CO.sub.2 and/or nitrogen, in gas or liquid form, as a blowing agent and subsequently extruding, cooling and drying the resulting polystyrene foam.

REFERENCES:
patent: Re26278 (1967-10-01), Pottenger
patent: 4344710 (1982-08-01), Johnson et al.
patent: 4424287 (1984-01-01), Johnson et al.
patent: 4470938 (1984-09-01), Johnson et al.
patent: 4940735 (1990-07-01), Kress
patent: 5009809 (1991-04-01), Kosin et al.
patent: 5009810 (1991-04-01), Wason et al.

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