Process for making large cross-section olefinic polymer foam str

Details Process for making large cross-section olefinic polymer foam str Process for making large cross-section olefinic polymer foam str

1993-04-30

1995-05-02

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 51, 521 79, 521143, B29C 6722

Patent

active

054116848

ABSTRACT:
Disclosed is an extruded, unitary, closed-cell olefin polymer foam structure in plank form. The foam structure has a cross-section of 2 or more inches in one dimension and 18 or more inches in the other dimension. The olefin polymer material has a melt index of about 3.5 grams/10 minutes or less. The foam structure contains a blowing agent of about 75 mole percent or more 1,1-difluoroethane based upon the total moles of blowing agent. Further disclosed is a process for making the foam structure at a shear rate of about 400/second or more. It was found surprising that 1,1-difluoroethane which has relatively low solubility in olefin polymers, could be used to make olefin polymer foam structures of large cross-section.

REFERENCES:
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patent: 5147896 (1992-09-01), York
Patent application No. 08056230 by Malone.

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