Microporous film and method for preparing the same

Details Microporous film and method for preparing the same Microporous film and method for preparing the same

C - Chemistry, Metallurgy

08

J

18/29, 319/63

C08J 9/28 (2006.01) C08J 9/00 (2006.01) H01M 2/16 (2006.01)

Patent

CA 1084663

ABSTRACT OF THE DISCLOSURE A microporous film comprising a 40 to 90 volume percent polyolefin having a number average molecular weight of 15,000 or more and a weight average molecular weight of less than 300,000 and a 10 to 60 volume percent inorganic filler and having a void space rate or porosity of 30 to 75 volume percent based on the volume of the film. The microporous film of such specific composition and structure has a desired wettability and much reduced electrical resistance as low as 0.0006 .OMEGA.dm2/sheet, keeping sufficient flexibility and mechanical strength and is useful in wide variety of applications, especially with great advantage for separators of battery or electrolytical apparatuses etc. Such microporous material is prepared by blending the specified polyolefin, the inorganic filler and an organic liquid in amounts of 10 to 60 volume percent, 6 to 35 volume percent and 30 to 75 volume percent, respectively based on the whole volume of the blend, the amount of the polyolefin being 2/3 to 9 multiple of the amount of the inorganic filler; subjecting the blend to molding to form a film; and extracting from the film said organic liquid.

255022

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