Process for producing foamed and molded article of polypropylene

Details Process for producing foamed and molded article of polypropylene Process for producing foamed and molded article of polypropylene

1982-08-04

1984-04-03

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 53, 264DIG5, 264DIG15, 264DIG16, B29D 2700

Patent

active

044407033

ABSTRACT:
A process for producing a foamed and molded article of a polypropylene resin, which comprises pressurizing preliminarily-foamed particles of an ethylene/propylene copolymer having a melt index value of from 0.1 to 25, a latent heat of crystallization of not more than 28 cal/g and an ethylene content of from 1 to 30% by weight as a base resin with an inorganic gas or a gaseous mixture of the inorganic gas and a volatile blowing agent thereby to impart an elevated pressure to the inside of said particles, thereafter filling said particles in a mold capable of enclosing the particles but allowing escape of gases therefrom, and then heating said particles to expand them to the configuration of the mold.

REFERENCES:
patent: 2768407 (1956-10-01), Lindemann
patent: 3126432 (1964-03-01), Schuur
patent: 3250730 (1966-05-01), Palmer
patent: 3776989 (1973-12-01), Annis, Jr. et al.
patent: 3793415 (1974-02-01), Smith
patent: 3876494 (1975-04-01), Ogawa et al.
patent: 4150077 (1979-04-01), Slocumb
patent: 4275023 (1981-06-01), Shimizu et al.

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