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US 8,283,073 B2Granted
Microporous polyolefin membrane
AssigneeAsahi Kasei E-Materials Corporation
InventorsTakashi Ikemoto, Yoshihiro Imamura, Takeshi Onizawa
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Abstract
The present invention provides a microporous polyolefin membrane having a porosity of 45% to 85% wherein the microporous polyolefin membrane easily absorbs the strain produced when the membrane undergoes compression, and retains excellent permeability and excellent electrical insulation performance even after compression by setting the maximum pore diameter at 0.1 μm to 0.23 μm, the MD elastic modulus at 400 to 2,000 MPa, and the ratio MD elastic modulus/TD elastic modulus at 1.5 to 9.
Claims10
A microporous polyolefin membrane having a porosity of 45% to 85%, wherein
- a maximum pore diameter is 0.1 μm to 0.23 μm;
- a longitudinal (MD) elastic modulus is 400 MPa to 2,000 MPa;
- and
- a ratio of the MD elastic modulus to a transverse (TD) elastic modulus is 1.5 to 9;
- and
- a content of a polyolefin resin in all components is 60% by mass or more.
3 more elements
Dependencies are inferred from the claim text.