Pre-foamed particles of polypropylene-base resin

Details Pre-foamed particles of polypropylene-base resin Pre-foamed particles of polypropylene-base resin

1985-05-06

1986-02-04

Van Balen, William J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

521 58, 521 59, 521144, C08J 918, B32B 2700

Patent

active

045686084

ABSTRACT:
In pre-foamed particles of a propylene-base resin obtained by foaming raw particles of the propylene-base resin, the relation, G.sub.1 -G.sub.2 .gtoreq.10%, exists between the content G.sub.1 (%) of matter, which is contained in the pre-foamed particles and is insoluble in boiling n-heptane, and the content G.sub.2 (%) of matter contained in the raw particles and insoluble in boiling n-heptane. The pre-foamed particles have excellent moldability and can hence provide with ease low-density (highly-expanded) molded articles, which enjoy superb dimensional accuracy, good surface conditions, low percent water absorption, excellent impact and chemical resistance.

REFERENCES:
patent: 3250730 (1966-05-01), Palmer
patent: 3341481 (1967-09-01), Palmer
patent: 4448901 (1984-05-01), Senda et al.
patent: 4510292 (1985-04-01), Chiba et al.
patent: 4540718 (1985-09-01), Senda et al.

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