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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.:

US 12370772 B1

PDFFull Text
Date of Patent:
Jul. 29, 2025

Filed:

Jan. 29, 2021

Microporous film, and method for producing same

Applicant:

Asahi Kasei Battery Separator Corporation, Tokyo, JP;

Inventors:

Yuzuru Sakakibara, Tokyo, JP;

Xun Zhang, Tokyo, JP;

Yuka Sato, Tokyo, JP;

Kosuke Mizobuchi, Tokyo, JP;

Assignee:

Asahi Kasei Battery Separator Corporation, Tokyo, JP;

Attorney:

Morgan, Lewis & Bockius LLP

Primary Examiner:

Chinessa T Golden

Int. Cl.
CPC ...
B32B 3/30 (2006.01); B29C 48/00 (2019.01); B29C 48/21 (2019.01); B29C 48/275 (2019.01); B32B 3/26 (2006.01); B29K 23/00 (2006.01); B29K 105/00 (2006.01); B29K 105/04 (2006.01); B29K 105/12 (2006.01); B29L 7/00 (2006.01); B29L 9/00 (2006.01);
U.S. Cl.
CPC ...
B32B 3/30 (2013.01); B29C 48/0013 (2019.02); B29C 48/0018 (2019.02); B29C 48/022 (2019.02); B29C 48/21 (2019.02); B29C 48/278 (2019.02); B32B 3/26 (2013.01); B29K 2023/06 (2013.01); B29K 2023/12 (2013.01); B29K 2105/0038 (2013.01); B29K 2105/041 (2013.01); B29K 2105/122 (2013.01); B29K 2995/0094 (2013.01); B29L 2007/002 (2013.01); B29L 2009/00 (2013.01);
Abstract

Provided is a microporous film which has a surface A and a surface B opposite to the surface A. In one embodiment, the microporous film has a ratio (F/F) of a dynamic friction coefficient Fof the surface B to a dynamic friction coefficient Fof the surface A of 1.2 to 20. In another embodiment, the microporous film is a single layer having a thickness of 3-18 μm, a number Nof pores on the surface A is 10-100/μm, a number Nof pores on the surface B is 20-200/μm, and N/Nis 0.2-0.96. In addition, a total area Sof pores on the surface A is 0.02-0.5 μm/μm, a total area Sof pores on the surface B is 0.01-0.3 μm/μm, and S/Sis 1.1-10. Furthermore, in another embodiment, a number Wof protrusion-like bodies on the surface B is 0.2-1000/100 μm.

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