Preparation of polyolefin foams

Details Preparation of polyolefin foams Preparation of polyolefin foams

1988-03-04

1990-01-16

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 85, 264141, 264142, C08J 922

Patent

active

048941913

ABSTRACT:
Polyolefin foams which have a density of from 30 to 300 g/l, do not exhibit after-shrinkage and possess taut cells are prepared by letting down a polyolefin/blowing agent gel, the latter first being let down to 0.1-10 bar gage pressure and the foam being kept at this pressure until it has cooled to at least 20.degree. C. below the expansion temperature.

REFERENCES:
patent: 3812225 (1974-05-01), Hosoda et al.
patent: 4271107 (1981-06-01), Phipps
patent: 4284596 (1981-08-01), Inokuchi et al.
patent: 4487731 (1984-12-01), Kobayashi
patent: 4631159 (1986-12-01), Maeda et al.
patent: 4676939 (1987-06-01), Kuwabara
patent: 4704239 (1987-11-01), Yoshimura et al.

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