Polyolefin microporous film
AssigneeAsahi Kasei E-Materials Corporation
InventorsTakashi Ikemoto, Yoshihiro Imamura
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Abstract
There is provided a polyolefin microporous film which is excellent in taking-up stability in a production line and a processing line of the polyolefin microporous film, and further in a line for a battery taking-up step, and hardly generates step deviation when a roll thereof has received an impact. The polyolefin microporous film has a compression elastic modulus of 0.1 to 1,000 kPa, and a ratio of a tensile elastic modulus in the longitudinal direction to a tensile elastic modulus in the transverse direction of 1.5 to 7.8.
Claims11
A biaxially stretched polyolefin microporous film, having a compression elastic modulus of 0.1 to 50 kPa, and a ratio of a tensile elastic modulus in a longitudinal direction to a tensile elastic modulus in a transverse direction of 1.5 to 7.8, wherein
- a tensile strength at break in the transverse direction of the biaxially stretched polyolefin microporous film is 50 MPa or more and 500 MPa or less,
- an average pore diameter of the polyolefin microporous film is 0.06 to 0.09 μm, and wherein an air permeability of the biaxially stretched polyolefin microporous film is in the range of 10 sec/100 cc to 500 sec/100 cc.
Dependencies are inferred from the claim text.