Porous film, process for producing the same, and use of the same
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United States of America Patent
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Jan 31, 1995
Grant Date -
N/A
app pub date -
Mar 30, 1993
filing date -
Mar 30, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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