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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 9843030 B1

PDFFull Text
Date of Patent:
Dec. 12, 2017

Filed:

May. 28, 2015

Polyolefin multilayer microporous membrane and battery separator

Applicant:

Toray Battery Separator Film Co., Ltd., Tochigi, JP;

Inventors:

Yukiko Miura, Nasushiobara, JP;

Hideto Mitsuoka, Nasushiobara, JP;

Takashi Kubota, Nasushiobara, JP;

Assignee:

TORAY INDUSTRIES, INC., Tokyo, JP;

Attorney:

Kilpatrick Townsend & Stockton LLP

Primary Examiner:

Mark F Huff

Assistant Examiner:

Monique Wills

Int. Cl.
CPC ...
H01M 10/42 (2006.01); H01M 2/16 (2006.01); B32B 27/32 (2006.01); C08J 9/00 (2006.01); C08L 23/06 (2006.01); C08L 23/12 (2006.01); H01M 10/0525 (2010.01); B01D 71/26 (2006.01); B01D 67/00 (2006.01); B01D 69/12 (2006.01); B32B 27/08 (2006.01);
U.S. Cl.
CPC ...
H01M 2/1653 (2013.01); B01D 67/002 (2013.01); B01D 67/003 (2013.01); B01D 67/0027 (2013.01); B01D 69/12 (2013.01); B01D 71/26 (2013.01); B32B 27/08 (2013.01); B32B 27/32 (2013.01); C08J 9/00 (2013.01); C08L 23/06 (2013.01); C08L 23/12 (2013.01); H01M 2/16 (2013.01); H01M 2/1686 (2013.01); H01M 10/0525 (2013.01); B01D 2313/12 (2013.01); B01D 2325/04 (2013.01); B01D 2325/22 (2013.01); B01D 2325/24 (2013.01); B01D 2325/34 (2013.01); B32B 2307/308 (2013.01); B32B 2307/581 (2013.01); B32B 2307/744 (2013.01); B32B 2457/10 (2013.01); C08L 2203/20 (2013.01); C08L 2205/02 (2013.01); C08L 2207/062 (2013.01); C08L 2207/068 (2013.01);
Abstract

A polyolefin multilayer microporous membrane is disclosed. The polyolefin multilayer microporous membrane has at least three layers, the membrane comprising a first microporous layer composed of a polyethylene resin containing an ultrahigh molecular weight polyethylene (surface layers) and a second microporous layer composed of a polyolefin rein containing a high-density polyethylene and polypropylene (intermediate layer), wherein (I) the pin puncture strength is at least 25 g/μm, (II) the coefficient of static friction with respect to a metal foil is at least 0.40, and (III) the meltdown temperature is at least 180° C.

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