Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1980-04-30
1983-09-06
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264DIG5, 264DIG13, B29D 2700
Patent
active
044028938
ABSTRACT:
The invention provides a novel and improved method for the preparation of a cellular foamed body of a vinyl chloride-based resin having a very fine and uniform cellular structure with high productivity in a continuous process. According to the inventive method, a vinyl chloride-based resin is admixed with a nucleating agent and a foam conditioning resin which is a specified acrylic resin or a styrene-based resin into a resin composition and the resin composition is first heated under pressure to be converted into an at least partly gelled mass, into which a volatilizable foaming agent which is an organic solvent having a boiling point not exceeding 90.degree. C. is injected under pressure so as that the resin composition is uniformly impregnated with the foaming agent. The foaming agent-impregnated and completely gelled resin composition is then brought under a reduced pressure to be expanded into foams with simultaneous cooling.
The above process is most conveniently practiced by use of an extruder machine in which the volatilizable foaming agent is continuously injected into the cylinder where the heated and gelled resin composition is running.
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Eguchi Yoshitugu
Imada Kiyoshi
Kitamura Hajime
Anderson Philip E.
Shin-Etsu Chemical Co. , Ltd.
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