Separator for a battery using an organic electrolytic solution a

Details Separator for a battery using an organic electrolytic solution a Separator for a battery using an organic electrolytic solution a

1994-11-21

1997-06-24

McCamish, Marion E.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

204295, 204296, 4283044, 4283211, 428339, 429129, 429142, 429145, 429249, 429254, B32B 326, H01M 216, C25B 1300

Patent

active

056415656

ABSTRACT:
A separator for a battery using an organic electrolytic solution, which comprises a microporous film comprising a matrix comprised of a polyethylene and a propylene polymer having a weight average molecular weight of from 10,000 to 1,000,000, the propylene polymer being present in a proportion of from 5 to 45% by weight, based on the total weight of the polyethylene and the propylene polymer, the polyethylene containing a fraction having a molecular weight of not smaller than 1,000,000 in a proportion of at least 10% by weight and a fraction having a molecular weight of not greater than 100,000 in a proportion of at least 5% by weight, and wherein the microporous film has a thickness of from 10 to 500 .mu.m, a porosity of from 40 to 85% and a maximum pore diameter of from 0.05 to 5 .mu.m.

REFERENCES:
patent: 4335193 (1982-06-01), Doi et al.
patent: 4731304 (1988-03-01), Lundquist et al.
patent: 4863792 (1989-09-01), Mrozinski
patent: 5238735 (1993-08-01), Nagou et al.
patent: 5240655 (1993-08-01), Troffkin et al.
Patent Abstract of Japan, vol. 16, No. 389 (E-1250) 19 Aug. 1992 & JP-A-41-26 352 (Nitto Denko).
Patent Abstract of Japan, vol. 14, No. 163 (E-910) (4106) 29 Mar. 1990 & JP-A-20 21 559 (Nitto Denko Corp.).

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