Process for producing thermoplastic resin foam

Details Process for producing thermoplastic resin foam Process for producing thermoplastic resin foam

1985-04-19

1986-06-24

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 54, 264DIG9, 521 60, 521 79, 521 92, 521 93, 521147, C08J 908, C08J 922

Patent

active

045968322

ABSTRACT:
In producing a foam by foaming a melt-plasticized styrene/maleic anhydride copolymer resin, a process for producing a highly foamed styrene/maleic anhydride copolymer resin foam characterized by using as the blowing agent at least one compound selected from the group consisting of a carboxylate of a metal of group Ia of the periodic table of elements, a carbonate of a metal of group Ia, a carboxylate of a metal of group IIa and a carbonate of a metal of group IIa; or by first blending with said copolymer resin at least one compound selected from the group consisting of a carboxylate of a metal of group Ia of the periodic table of elements, a carbonate of a metal of group Ia, a carboxylate of a metal of group IIa and a carbonate of a metal of group IIa, then melt-blending the mixture, followed by extruding and granulating the blend to form a pre-expanded granular product, and thereafter foaming the granular product thus obtained.

REFERENCES:
patent: 3406230 (1968-10-01), Baxter et al.
patent: 4207402 (1980-06-01), Sprenkle
patent: 4306036 (1981-12-01), Corbett
patent: 4307202 (1981-12-01), Corbett

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