Microporous polyolefin film, separator for battery, and production processes therefor
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United States of America Patent
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Nov 26, 2019
Grant Date -
Sep 28, 2017
app pub date -
Nov 5, 2015
filing date -
Nov 18, 2014
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Abstract
A polyolefin microporous membrane is disclosed. The membrane has a width of not less than 100 mm, and a variation range of an F25 value in a width direction is not greater than 1 MPa. The F25 value is a value obtained by dividing a load at 25% elongation of a sample of the laminated polyolefin microporous membrane as measured with a tensile testing machine by a cross-sectional area of the sample.
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