Method of producing open-cell foams of cross-linked polyolefins

Details Method of producing open-cell foams of cross-linked polyolefins Method of producing open-cell foams of cross-linked polyolefins

1992-07-20

1993-09-07

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 51, 264 55, 264321, B29C 6722

Patent

active

052426343

ABSTRACT:
An open-cell foam of a cross-linked polyolefin possessing uniform physical properties, a high degree of expansion, and a high open-cell ratio can be produced with high operational efficiency and high material utilization by a method which includes thermally shaping under pressure a foamable and cross-linkable polyolefin composition capable of being heated with a microwave, then heating the composition by irradiation with a microwave thereby inducing partial decomposition of a cross-linking agent and a foaming agent contained in the composition, subsequently externally heating under normal pressure the resultant intermediate partially foamed product thereby effecting decomposition of the remainders of the cross-linking agent and foaming agent, and thereafter subjecting the resultant foam to mechanical deformation thereby establishing intercommunication among the cells. The surface of the foamable and cross-linkable polyolefin composition may be heated prior to the heating with a microwave to effect partial cross-linking of the surface part of the composition.

REFERENCES:
patent: 4372898 (1983-02-01), Menges et al.
patent: 4384049 (1983-05-01), Rametsteiner
patent: 4391922 (1983-07-01), Harrell
patent: 4578231 (1986-03-01), Molteni
patent: 4877814 (1989-10-01), Ito
patent: 5070124 (1991-12-01), Bohen et al.

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