Armstrong, Nikaido, Marmelstein & Kubovcik
Method of producing open-cell foamed articles of cross-linked polyolefins
 An open-cell foamed article of a cross-linked polyolefin having a high open-cell ratio and a high degree of expansion is produced by a method which comprises the steps of preparing a foamable and cross-linkable polyolefin composition, forming the composition into a desired shape maintaining its gel percent at zero, decomposing the cross-linking agent and blowing agent concurrently by heating the composition under atmospheric pressure in such conditions that the peak of the ratio of the degree of cross-linking to the degree of decomposition of the blowing agent is not more than 20 and exerting a mechanical deformation to the resulting polyolefin foam to rupture the cell membranes. 
Sanwa Kako Company, Limited
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B29K B29C Y10S C08J Y10S B29C B29K Y10S C08J B29C B29K
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Shuji Takeo Hiroo
Miura Kasanami Ito