Porous film of high molecular weight polyolefin and process for

Details Porous film of high molecular weight polyolefin and process for Porous film of high molecular weight polyolefin and process for

1997-11-18

2000-04-11

Zirker, Daniel

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

428220, 21050027, 21050036, 521 61, 521918, B32B 2732

Patent

active

060486074

ABSTRACT:
The present invention relates to a porous or microporous film of a high molecular weight polyolefin excellent in strength and air-permeability and suitable for use in filtering materials, separators for aqueous electrolyte batteries, separator films for batteries, separator films for electrolytic capacitors, and air-permeable films; for moisture-permeable water-proof use such as paper diapers and house-wrapping films; and for other uses such as cloths, package and printing, as well as a process for producing same. The feature of the present invention resides in an aspect that the film is composed of fibrils comprising extended-chain crystals and lamellar crystals and/or fibrils comprising helicoidal crystals.
This porous film of a high molecular weight polyolefin is produced by subjecting an air-impermeable film of a high molecular weight polyolefin to thermal treatment followed by, if necessary, a stretching treatment and/or a thermosetting treatment.

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JP 94002841 Pat. Abst. Jan. 1994.
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JP 5017782 Pat. Abst. Mar. 1995.

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