Process for producing open-cell polyethylene foam materials and

Details Process for producing open-cell polyethylene foam materials and Process for producing open-cell polyethylene foam materials and

1986-09-05

1989-10-31

Anderson, Philip

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 453, 264 54, 264321, 264DIG5, 264DIG16, 264DIG18, 521143, 521180, 521182, 521184, 521185, 521189, C08J 906, B29C 5904, B29C 6722

Patent

active

048778141

ABSTRACT:
This disclosure relates to a method for producing polyethylene open-cell foam materials, comprising a process step of pressurized heating at a temperature of 110.degree. to 135.degree. C. of a base compound consisting of polyethylene or a copolymer of polyethylene which has been compounded with an azodicarbonamide foaming agent and a bridging agent, in order to obtain a primary intermediate product with a cubical expansion coefficient of 1.0 to 2.0 times; a process step of heating the primary intermediate product under normal atmospheric pressure at a temperature of 150.degree..about.190.degree. C. and thus causing the complete decomposition of the foaming agent in order to obtain a secondary intermediate product having cell membranes capable of being easily ruptured by mechanical compression; and a process step of subjecting said secondary intermediate product to mechanical pressure in order to rupture and interconnect the closed cells; and, as needed, a foaming assist agent, or a high-melting-point resin powder, or both a high-melting-point resin powder and a foaming assist agent are added to and compounded with the base compound so that the resulting products are high-expansive or ultra-high-expansive materials with an expansion ratio of 25 times said base compound, or more, and have an open-cell ratio nof 96.about.100%.

REFERENCES:
patent: 3159854 (1965-07-01), Smith
patent: 3239585 (1966-03-01), Karpovich et al.
patent: 3300558 (1967-01-01), Grant et al.
patent: 3329759 (1967-07-01), Rice
patent: 3386877 (1968-06-01), Skochdopole et al.
patent: 3394214 (1968-07-01), Benning
patent: 3459274 (1969-08-01), MacPhail, Sr.
patent: 3608056 (1971-09-01), Nelson
patent: 3862291 (1975-01-01), Brandon, Jr. et al.
patent: 3865674 (1975-02-01), Duling et al.
patent: 4105738 (1978-08-01), Rohn
patent: 4435346 (1984-03-01), Ito et al.

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