US 11,837,693 B2
Polyolefin microporous membrane with improved puncture elongation and thermomechanical properties and method for manufacturing the same
Mana Kajiwara, Tokyo (JP); and Hiroshi Miyazawa, Tokyo (JP)
Assigned to Asahi Kasei Kabushiki Kaisha, Tokyo (JP)
Appl. No. 16/623,981
Filed by Asahi Kasei Kabushiki Kaisha, Tokyo (JP)
PCT Filed Aug. 31, 2018, PCT No. PCT/JP2018/032496
§ 371(c)(1), (2) Date Dec. 18, 2019,
PCT Pub. No. WO2019/045077, PCT Pub. Date Mar. 7, 2019.
Claims priority of application No. 2017-167950 (JP), filed on Aug. 31, 2017.
Prior Publication US 2020/0144577 A1, May 7, 2020
Int. Cl. H01M 10/0525 (2010.01); H01M 50/403 (2021.01); H01M 50/417 (2021.01); H01M 50/489 (2021.01); H01M 50/406 (2021.01); H01M 50/491 (2021.01)
CPC H01M 10/0525 (2013.01) [H01M 50/403 (2021.01); H01M 50/406 (2021.01); H01M 50/417 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01)] 15 Claims
OG exemplary drawing
 
1. A polyolefin microporous membrane having a puncture elongation of not more than 2.30 mm, a temperature at a stress inflection point of not less than 80.0° C., and a stress peak value of not more than 1.8 g in thermomechanical analysis (TMA) measurement of a transverse direction of the polyolefin microporous membrane, wherein the polyolefin microporous membrane is a single layer excluding an inorganic coating layer at a measurement of the puncture elongation and the TMA measurement performed in constant length mode.