Porous film, process for producing the same, and use of the same

Details Porous film, process for producing the same, and use of the same Porous film, process for producing the same, and use of the same

1993-03-30

1995-01-31

Seccuro, Jr., Carman J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283199, 4283184, 4283084, 4283157, 428913, 428931, 429254, 521134, B32B 518, H01M 216, C08J 518, C08L 2304, C08L 2310

Patent

active

053857771

ABSTRACT:
A porous film comprising a composition of 10 to 90% by weight of polypropylene and 10 to 90% by weight of polyethylene having an Mw/Mn ratio, as determined by high-temperature gel-permeation chromatography, of 10 or less is disclosed. The porous film has a high tensile modulus, a satisfactory appearance, and a uniform thickness. A battery separator comprising the porous film performs a shut-down function (an increase in resistance) in case of a temperature rise due to an abnormal current.

REFERENCES:
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patent: 3952073 (1976-04-01), Isaka et al.
patent: 3969562 (1976-07-01), Suzuki
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patent: 4873116 (1989-10-01), Ancker
patent: 5051183 (1991-09-01), Takita et al.
Journal of App. Poly. Sci. vol. 26 "Drawing Behavior of Polyethylene-Polypropylene Blends". pp. 3515-3521 (1981).
Database WPI, Derwent Publications-Nitto Electric Ind. (1 page).
Patent Abstracts of Japanese Application JP4206257-Nov. 10, 1992 (1 page).

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