Microporous polyolefin film, separator for battery, and production processes therefor
AssigneeToray Industries, Inc.
InventorsNaoki Mizuno, Masami Sugata
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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.
Claims7
A polyolefin microporous membrane having a width of not less than 100 mm, wherein a variation range of an F25 value in a width direction is not greater than 1 MPa, and wherein the F25 value is obtained by dividing a load at 25% elongation of a sample of the polyolefin microporous membrane as measured with a tensile testing machine by a cross-sectional area of the sample.
A battery separator comprising:
- a polyolefin microporous membrane;
- and
- a porous layer on one or more sides of the polyolefin microporous membrane,
- wherein:
- the porous layer includes a water-soluble resin or a water-dispersible resin and a heat-resistant particle,
- a variation range of an F25 value in a width direction of the polyolefin microporous membrane is not greater than 1 MPa,
- an average thickness T(ave) of the porous layer is from 1 μm to 5 μm, and
- the F25 value is obtained by dividing a load at 25% elongation of a sample of the polyolefin microporous membrane as measured with a tensile testing machine by a cross-sectional area of the sample.
Dependencies are inferred from the claim text.