Microporous film of high molecular weight polyolefin and...

Details Microporous film of high molecular weight polyolefin and... Microporous film of high molecular weight polyolefin and...

B - Operations, Transporting

01

D

B01D 71/26 (2006.01) B01D 67/00 (2006.01) B29C 55/00 (2006.01) B29C 71/02 (2006.01) C08J 5/18 (2006.01) H01M 2/16 (2006.01)

Patent

CA 2181423

A microporous film of high molecular weight polyolefin useful in the prepration of filter mediums or non-aqueous battery separators and a process for producing the film are disclosed. The microporous film of high molecular weight polyolefin contains leaf vein-like fibrils as a main constituent on each of which fibrils indeterminate-form crystallites of not more than 1 µm in size flocculate and has an intrinsic viscosity, [?], of 4 dl/g or more and, preferably, has: (a) a void content of 25 % or more; (b) a gas permeability of 1900 sec/100 cc or less; (c) a tensile strength of 0.05 GPa or more; and (d) a gas impermeability-acquiring temperature of 140°C or lower. The microporous film is produced by subjecting a high molecular weight, biaxially oriented polyolefin film of 60 % or more in crystallinity to a heat treatment and, if necessary, to a stretch treatment to thereby melt or dissolve the indeterminate-form portion of the film, then crystallizing it onto the fibrils as crystallites.

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