Polyolefin microporous membrane

Details Polyolefin microporous membrane Polyolefin microporous membrane

2011-08-23

2011-08-23

Johnson, Christina (Department: 1742)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer, spacer or materials for use therewith

Reexamination Certificate

active

08003261

ABSTRACT:
The present invention provides a microporous polyolefin film having a thickness of 1 μm (inclusive) to 50 μm (inclusive), a porosity of 30% (inclusive) to 70% (inclusive), a piercing strength of 0.15 N/μm or more in terms of a film thickness of 1 μm, tensile strengths in the length direction (MD tensile strength) and the width direction (TD tensile strength) of 30 MPa or more each, a thermal shrinkage in the width direction (TD thermal shrinkage) of 1% or less at 65° C., and a thermal shrinkage ratio in the length to width direction (MD/TD thermal shrinkage ratio) of more than 2 at 65° C. A process for producing the microporous film and a nonaqueous electrolyte secondary battery using the film are also provided.

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