Method of producing microporous polyolefin membrane

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

B - Operations, Transporting

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D

B01D 67/00 (2006.01) B01D 71/26 (2006.01) C08J 5/18 (2006.01) C08J 9/28 (2006.01) H01M 2/16 (2006.01)

Patent

CA 2186560

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 x 105 to 2.5 X 106 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.

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