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:
Oct. 09, 2012
Filed:
Jan. 23, 2008
Applicants:
Takashi Ikemoto, Tokyo, JP;
Yoshihiro Imamura, Tokyo, JP;
Takeshi Onizawa, Tokyo, JP;
Inventors:
Assignee:
Asahi Kasei E-Materials Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01M 2/16 (2006.01); B32B 3/26 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides a microporous polyolefin membrane having a porosity of 45% to 85% wherein the microporous polyolefin membrane easily absorbs the strain produced when the membrane undergoes compression, and retains excellent permeability and excellent electrical insulation performance even after compression by setting the maximum pore diameter at 0.1 μm to 0.23 μm, the MD elastic modulus at 400 to 2,000 MPa, and the ratio MD elastic modulus/TD elastic modulus at 1.5 to 9.