Method of producing of microporous polyolefin membrane

Details Method of producing of microporous polyolefin membrane Method of producing of microporous polyolefin membrane

1996-09-24

1998-11-03

Teskin, Fred

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

4283157, 428333, 428339, 264 41, 264204, 2642101, 26421112, 2642888, 264344, 528502B, 5263481, 521143, C08J 900, B32B 326

Patent

active

058305548

ABSTRACT:
An efficient method of producing a microporous polyolefin membrane having improved tensile strength and pierce strength is provided, in which a solution having dissolved therein 5% by weight to 50% by weight of a polyolefin whose weight-average molecular weight is in the range of 5.times.10.sup.5 to 2.5.times.10.sup.6 and whose weight-average molecular weight to number-average molecular weight ratio is less than 10, is extruded and rapidly cooled to obtain a gel-like product which is then stretched and has remaining solvent removed therefrom.

REFERENCES:
patent: 5238618 (1993-08-01), Kinzer
patent: 5376445 (1994-12-01), Fortuin et al.
patent: 5643511 (1997-07-01), Pluyter et al.

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