Porous film and separator for battery using the same

Details Porous film and separator for battery using the same Porous film and separator for battery using the same

B - Operations, Transporting

29

C

B29C 67/20 (2006.01) B01D 67/00 (2006.01) B01D 71/26 (2006.01) B29C 55/00 (2006.01) H01M 2/14 (2006.01)

Patent

CA 2350379

Provided is a porous film obtained by melt-kneading a high-molecular-weight polyolefin having a weight-average molecular weight of not less than 5 x 10 5, a thermoplastic resin having a weight-average molecular weight of not more than 2 x 10 4 and fine particles, molding the kneaded matter into a sheet, and then stretching the sheet. The porous film can be easily and simply prepared, and has a high piercing strength, and hence can be advantageously used as a separator for a battery, particularly for a lithium secondary battery.

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