Porous multi-layer film

Details Porous multi-layer film Porous multi-layer film

B - Operations, Transporting

32

B

B32B 5/18 (2006.01) B32B 27/32 (2006.01) H01M 2/14 (2006.01) H01M 2/16 (2006.01)

Patent

CA 2149284

A porous multi-layer film favorably employable as a separator film for a nonaqueous electric battery compris- es at least three united polyolefin layers, in which at least one polyolefin layer is a polyethylene layer and at least one polyolefin layer is a polypropylene layer which is placed in contact with the polyethylene layer. The polyolefin layers are combined to fonm a united structure with a peel strength of at least 3 g/15 mm and has a pore volume of 30-80%, a maximum pore size of 0.02-2 µm, a shutdown temperature of 135-140°C, and a thermal dura- bility to maintain the shutdown condition up to at least 180°C.

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