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. 12, 2005
Filed:
Nov. 01, 2001
Toshio Tanaka, Ohtsu, JP;
Hiroki Yamaguchi, Ohtsu, JP;
Naohiko Takimoto, Ohtsu, JP;
Masahiro Yamashita, Princeton Junction, NJ (US);
Toshio Tanaka, Ohtsu, JP;
Hiroki Yamaguchi, Ohtsu, JP;
Naohiko Takimoto, Ohtsu, JP;
Masahiro Yamashita, Princeton Junction, NJ (US);
Toyo Boseki Kabushiki Kaisha, Osaka, JP;
Abstract
An object of the present invention is to provide a thin battery separator having an excellent nitrate group trapping performance and a high piercing strength. The inventive separator for a secondary battery, which can accomplish such an object, is made of a resin composition mainly containing a polyolefin having a hydrophilic functional group, wherein the resin composition has a content (ratio to a total resin amount) of a low-density polyethylene of 20 mass % or less, a piercing strength of 5 to 100 N, a Metsuke of 20 to 75 g/m, a thickness of 15 to 150 μm, and an unneutralized hydrophilic functional group amount of 1×10to 5×10mol/m.