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. 24, 2017
Filed:
Mar. 18, 2013
Toray Battery Separator Film Co., Ltd., Nasushiobara-shi, JP;
Toshiya Saito, Nasushiobara, JP;
Kazuhiro Yamada, Nasushiobara, JP;
Shintaro Kikuchi, Nasushiobara, JP;
Toray Industries, Inc., , JP;
Abstract
A polyolefin multilayer microporous membrane includes at least first microporous layers which form both surface layers of the membrane and at least a second microporous layer disposed between the both surface layers, wherein static friction coefficient of one of the surface layers of the polyolefin multilayer microporous membrane against another surface layer in a longitudinal direction (MD) is 1.1 or less, and wherein pore density calculated from an average pore radius measured by mercury porosimetry method and porosity, according to Formula (1) is 4 or more:Pore density=()×10  (1)wherein A represents the average pore radius (nm) measured by mercury porosimetry method and P represents the porosity (%).