Polyethylene microporous membrane and a process for the producti

Details Polyethylene microporous membrane and a process for the producti Polyethylene microporous membrane and a process for the producti

1986-02-25

1986-11-04

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264 53, 2642103, 2642896, 2642902, 264230, 264DIG71, 521 64, 521 61, 521918, B29C 2760

Patent

active

046209557

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: 3468862 (1969-09-01), Schotland
patent: 3839516 (1974-10-01), Williams et al.
patent: 4472328 (1984-09-01), Sugimoto et al.
patent: 4486377 (1984-12-01), Lucchesi et al.
patent: 4490431 (1984-12-01), Vitzthum et al.

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