Method for producing polypropylene foam

Details Method for producing polypropylene foam Method for producing polypropylene foam

1988-04-07

1989-11-21

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 453, 264338, 264DIG16, 264DIG18, B29C 6722, C08J 906

Patent

active

048821080

ABSTRACT:
A method of producing a crosslinked, uniformly foamed article of a polypropylene resin is provided. The polypropylene resin containing a crosslinking agent and a foaming agent is extruded through a long-land die which is provided with a choking die at an intermediate portion thereof; a lubricant is provided on the inner surface of the long-land die; the crosslinking agent is decomposed in the front stage of the long-land die; and the foaming agent is decomposed in the rear stage of the long-land die.
An ethylene-propylene random copolymer resin which contains 2 to 10 wt. % of ethylene and has a melt flow rate of 5 g/10 minutes or more at 230.degree. C. and a melt expansion ratio of 1.4 of less at 190.degree. C. is used as the polypropylene resin.

REFERENCES:
patent: 4552708 (1985-11-01), Kimura et al.

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