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US 2026/0188840 A1Published application
Polyolefin Microporous Membrane
AssigneeAsahi Kasei Battery Separator Corporation
InventorsWataru Mizutani, Tomosato Okubo, Masaaki Okada, Takeshi Matsubayashi
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Abstract
A polyolefin porous film is provided which has a film thickness of 1-30 μm and an air permeability of at most 500 sec/100 cm3, and which has a 30% or higher porosity after compression, measured in a compression test under the conditions in which the temperature is 70° C., the pressure is 8 MPa and the compression time is 3 minutes.
Claims14
1-15. (canceled)
A polyolefin microporous membrane, having:
- a basis weight-converted puncture strength of 50 gf/(g/m2) or more;
- a difference of 15 sec/100 cm3 or less between a maximum value and a minimum value of an air permeability measured at a total of three spots along the width direction (TD), which spots consist of two spots at 10% of a full width from the respective ends inward to the center and one central spot;
- and
- a pressurized-state air permeability of 140 sec/100 cm3 or less at 30BC in a pressurized state of 3 MPa.
1 more element
Dependencies are inferred from the claim text.