Porous multi-layer film

Details Porous multi-layer film Porous multi-layer film

1995-05-12

1997-11-25

McCamish, Marion E.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283159, 4283166, 428517, 429145, B32B 326, B32B 2732, H01M 216

Patent

active

056910479

ABSTRACT:
A porous multi-layer film favorably employable as a separator film for a nonaqueous electric battery comprises 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 form 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 .mu.m, a shutdown temperature of 135.degree.-140.degree. C., and a thermal durability to maintain the shutdown condition up to at least 180.degree. C.

REFERENCES:
patent: 3578544 (1971-05-01), Thorsrud
patent: 4731304 (1988-03-01), Lundquist et al.
patent: 4863792 (1989-09-01), Mrozinski
patent: 5342708 (1994-08-01), Green et al.

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