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:
Apr. 11, 2017
Filed:
Dec. 21, 2009
Applicants:
Daisuke Inagaki, Tokyo, JP;
Shinichi Iwakiri, Tokyo, JP;
Shintarou Inaba, Tokyo, JP;
Inventors:
Assignee:
ASAHI KASEI E-MATERIALS CORPORATION, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01M 10/0525 (2010.01); H01M 2/16 (2006.01); C08J 5/22 (2006.01);
U.S. Cl.
CPC ...
H01M 2/1653 (2013.01); C08J 5/2231 (2013.01); H01M 10/0525 (2013.01); C08J 2323/02 (2013.01); Y02E 60/122 (2013.01);
Abstract
A polyolefin microporous membrane that can realize a lithium ion secondary battery having favorable resistance against foreign matters or the like, and high cycle characteristics at a high temperature is provided. The present invention provides a polyolefin microporous membrane having a ratio of tensile strength in a length direction to that in a width direction of 0.75 to 1.25, and a thermal shrinkage rate in the width direction at 120° C. of less than 10%.