Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Patent
1995-01-31
1996-01-02
Skapars, Anthony
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
429254, 4283044, H01M 216
Patent
active
054807450
ABSTRACT:
A porous film, a process for producing the same, a battery separator comprising the porous film, and a battery having incorporated therein the separator are disclosed. The porous film comprises a polyethylene and a polypropylene as the essential components, wherein the polyethylene content in the total weight of polyethylene and polypropylene is from 2 to 40% by weight and the polyethylene content is changed in the direction of the thickness of the film, and is produced by forming a laminate film comprising at least one polypropylene layer and at least one layer of a mixture of polyethylene and polypropylene as the essential components, the polyethylene content in the film being from 2 to 40% by weight, uniaxially stretching the laminate film at a low-temperature range of from -20.degree. C. to 80.degree. C. and then stretching the film at a high-temperature range of from 90.degree. C. to 150.degree. C.
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Higuchi Hiroyuki
Matsushima Ryoichi
Matsushita Kiichiro
Nishiyama Soji
Nitto Denko Corporation
Skapars Anthony
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