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Abstract

A method for producing a polyolefin microporous membrane, comprising the following steps (A) to (D):

(A) a kneading step of kneading a polyolefin resin, a plasticizer, and an antioxidant to form a kneaded material;(B) a molding step of processing the kneaded material into a sheet-shaped molded form after the kneading step;(C) a stretching step of stretching the sheet-shaped molded form to form a stretched material, after the molding step; and(D) a porous sheet forming step of extracting the plasticizer from the stretched material to form a porous sheet, before and/or after the stretching step, wherein the step (A) is a step of kneading the plasticizer to which 0.05 to 5% by mass of the antioxidant based on the polyolefin resin is added, and the polyolefin resin.

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First Claim