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:
Feb. 09, 2021
Filed:
Jun. 06, 2014
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:
Assistant Examiner:
Int. Cl.
CPC ...
B32B 5/32 (2006.01); B29C 55/00 (2006.01); H01M 2/16 (2006.01); B29C 55/14 (2006.01); B01D 67/00 (2006.01); B29C 48/08 (2019.01); C08F 110/06 (2006.01); B32B 3/26 (2006.01); C08J 9/00 (2006.01); C08J 9/228 (2006.01); B29K 105/04 (2006.01); B29C 48/00 (2019.01);
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 2/1653 (2013.01); H01M 2/1686 (2013.01); B01D 2323/08 (2013.01); B01D 2323/14 (2013.01); B01D 2325/021 (2013.01); B29C 48/00 (2019.02); B29K 2105/04 (2013.01); 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.