The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 31, 2024
Filed:
Feb. 08, 2021
Applicant:
Celgard, Llc, Charlotte, NC (US);
Inventors:
Xiangyun Wei, Charlotte, NC (US);
Charles Haire, Lancaster, SC (US);
Assignee:
Celgard, LLC, Charlotte, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 5/32 (2006.01); B01D 67/00 (2006.01); B29C 48/08 (2019.01); B29C 55/00 (2006.01); B29C 55/14 (2006.01); B32B 3/26 (2006.01); C08F 110/06 (2006.01); C08J 9/00 (2006.01); C08J 9/228 (2006.01); H01M 50/411 (2021.01); H01M 50/414 (2021.01); H01M 50/449 (2021.01); H01M 50/457 (2021.01); H01M 50/491 (2021.01); H01M 50/494 (2021.01); B29C 48/00 (2019.01); B29K 105/04 (2006.01); H01M 50/489 (2021.01);
U.S. Cl.
CPC ...
B32B 5/32 (2013.01); B01D 67/0027 (2013.01); B29C 48/08 (2019.02); B29C 55/005 (2013.01); B29C 55/143 (2013.01); B32B 3/26 (2013.01); C08F 110/06 (2013.01); C08J 9/0061 (2013.01); C08J 9/228 (2013.01); H01M 50/414 (2021.01); H01M 50/457 (2021.01); H01M 50/491 (2021.01); H01M 50/494 (2021.01); B01D 2323/082 (2022.08); B01D 2323/14 (2013.01); B01D 2325/021 (2013.01); B29C 48/00 (2019.02); B29K 2105/04 (2013.01); H01M 50/489 (2021.01); Y10T 428/249953 (2015.04); Y10T 428/249958 (2015.04); Y10T 428/249975 (2015.04);
Abstract
A microporous membrane is made by a dry-stretch process and has substantially round shaped pores and a ratio of machine direction tensile strength to transverse direction tensile strength in the range of 0.5 to 5.0. The method of making the foregoing microporous membrane includes the steps of: extruding a polymer into a nonporous precursor, and biaxially stretching the nonporous precursor, the biaxial stretching including a machine direction stretching and a transverse direction stretching, the transverse direction stretching including a simultaneous controlled machine direction relax.