Process for producing foamed thermoplastic resin articles

Details Process for producing foamed thermoplastic resin articles Process for producing foamed thermoplastic resin articles

1988-03-18

1989-12-26

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264171, 264211, 4251311, 425817C, B29C 6722, B29C 4706

Patent

active

048896691

ABSTRACT:
A process for producing a foamed thermoplastic resin article is disclosed, comprising separately melt kneading the first thermoplastic resin composition comprising a first thermoplastic resin and 10 to 400 parts by weight per 100 parts by weight of the first thermoplastic resin of a filler and constituting an unfoamed layer at the time of extrusion molding, and the second thermoplastic resin composition comprising a second thermoplastic resin and a foaming agent and constituting a foamed layer at the time of extrusion molding, by the use of extruders, and extruding the two resin compositions in the form of laminate through a T die.

REFERENCES:
patent: 3331900 (1967-07-01), Thomas
patent: 3411981 (1968-11-01), Thomas
patent: 3668288 (1972-06-01), Takahashi
patent: 3855376 (1974-12-01), Ono et al.
patent: 4101050 (1978-07-01), Buckler et al.
patent: 4107247 (1978-01-01), Dukess
patent: 4221624 (1980-09-01), Eslinger et al.

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