US 12,390,772 B2
Polyethylene microporous membrane, method for manufacturing the same, and separator including microporous membrane
In Hwa Jung, Daejeon (KR)
Assigned to SK INNOVATION CO., LTD., Seoul (KR); and SK IE TECHNOLOGY CO., LTD., Seoul (KR)
Filed by SK INNOVATION CO., LTD., Seoul (KR); and SK IE TECHNOLOGY CO., LTD., Seoul (KR)
Filed on May 14, 2024, as Appl. No. 18/663,987.
Claims priority of application No. 10-2023-0062318 (KR), filed on May 15, 2023.
Prior Publication US 2024/0382909 A1, Nov. 21, 2024
Int. Cl. H01M 50/00 (2021.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 71/26 (2006.01); H01M 50/406 (2021.01); H01M 50/417 (2021.01)
CPC B01D 71/261 (2022.08) [B01D 67/002 (2013.01); B01D 67/0027 (2013.01); B01D 69/02 (2013.01); H01M 50/406 (2021.01); H01M 50/417 (2021.01); B01D 2325/02 (2013.01); B01D 2325/04 (2013.01); B01D 2325/20 (2013.01); B01D 2325/22 (2013.01); B01D 2325/24 (2013.01); B01D 2325/28 (2013.01); B01D 2325/34 (2013.01)] 12 Claims
 
1. A polyethylene microporous membrane comprising a thickness of 3 μm to 30 μm, a puncture strength of 0.15 N/μm or more, a shrinkage rate in the transverse direction of 5% or less, and a PS index represented by the following Equation 1 of 110 or more:

OG Complex Work Unit Math
wherein the shrinkage rate is measured after being allowed to stand at 121° C. for 1 hour.