Method of producing a microporous polyolefin membrane

Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ

Reexamination Certificate

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Details

Other Related Categories

C264S045800, C264S045900, C264S211120

Type

Reexamination Certificate

Status

active

Patent number

08075818

Description

ABSTRACT:
A method for producing a microporous polyolefin membrane formed by fine fibrils, the membrane comprising (A) a polyolefin having a weight-average molecular weight of 5×105or more or (B) a composition containing Component (A), connected to each other, and having micropores of 0.05 to 5 μm in average pore size and crystal lamellas of Component (A) or (B) being in a specific alignment state. The method includes extruding a solution of Component (A) or (B) in a solvent into a gel-like formed article; thermally setting the article, with or without stretching, at least at the crystal dispersion temperature of Component (A) or (B), but at melting point of Component (A) or (B) plus 30° C. or lower; and removing the solvent.

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