Electroconductive cross-linked polyolefin foam and method for ma

Details Electroconductive cross-linked polyolefin foam and method for ma Electroconductive cross-linked polyolefin foam and method for ma

1983-05-17

1985-05-28

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 54, 264DIG18, 521 79, 521 82, 521 96, 521143, 521915, B29J 102

Patent

active

045199639

ABSTRACT:
An electroconductive cross-linked polyolefin foam having electric resistance of not more than 100 M.OMEGA. and comprising uniform minute cells and proving useful for the production of IC cases, etc. is provided by a method which comprises kneading 100 parts by weight of a polyolefin, 10 to 30 parts by weight of carbon particles, and suitable amounts of a foaming agent and a cross-linking agent and heating the resultant cross-linkable and foamable composition under atmospheric pressure thereby allowing the composition to be cross-linked and foamed without being abruptly foamed or expanded or by a method which comprises heating the aforementioned cross-linkable and foamable composition in a metal mold under pressure to a temperature at which the foaming agent is not substantially decomposed thereby cross-linking the composition and then heating the resultant cross-linked foamable composition under atmospheric pressure thereby allowing the composition to be foamed without being abruptly foamed or expanded. The aforementioned cross-linking may be effected by irradiation of the composition with an electron beam.

REFERENCES:
patent: 3098831 (1963-07-01), Carr
patent: 4379098 (1983-04-01), Gumienny
patent: 4431575 (1984-02-01), Fujie et al.

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