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:
Jul. 22, 2014
Filed:
May. 31, 2012
Hiroto Yamada, Nagahama, JP;
Tomoyuki Nemoto, Nagahama, JP;
Hiroto Yamada, Nagahama, JP;
Tomoyuki Nemoto, Nagahama, JP;
Mitsubishi Plastics, Inc., Tokyo, JP;
Abstract
The present invention is capable of providing a multilayer porous film used as a separator for a non-aqueous electrolyte secondary battery. A multilayer porous film which is obtained by laminating a coating layer that contains a filler and a resin binder on at least one surface of a polyolefin resin porous film that serves as a base layer. The ratio of the average particle diameter (Du) of the filler within 25% of the thickness of the coating layer from the surface of the multilayer porous film to the average particle diameter (Db) of the filler within 25% of the thickness of the coating layer from the interface with the base layer, namely, Du/Db is 1.2 to 10; and the average particle diameter (Du) is 0.5 μm or less.