Polyethylene microporous membrane of ultra high molecular weight

Details Polyethylene microporous membrane of ultra high molecular weight Polyethylene microporous membrane of ultra high molecular weight

1985-04-29

1986-05-13

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

4283155, 521143, B32B 2732

Patent

active

045886334

ABSTRACT:
A polyethylene microporous membrane having a thickness of at most 10 .mu.m, a breaking strength of at least 200 kg/cm.sup.2 and a porosity of at least 30% is produced by heating and dissolving polyethylene having a weight average molecular weight of at least 5.times.10.sup.5 in a solvent, forming a gel sheet from the resulting solution, subjecting the gel sheet to a solvent removal treatment to adjust the amount of the solvent in the gel sheet to 10 to 80% by weight, heating and stretching the sheet and then removing the residual solvent therefrom.

REFERENCES:
patent: 4539256 (1985-09-01), Shipman

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