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:
Aug. 31, 2010
Filed:
Dec. 02, 2004
Norimitsu Kaimai, Kanagawa-ken, JP;
Shigeaki Kobayashi, Kanagawa-ken, JP;
Kotaro Kimishima, Kanagawa-ken, JP;
Sadakatsu Suzuki, Saitama-ken, JP;
Satoshi Ueki, Tokyo, JP;
Kazuhiro Yamada, Tochigi-ken, JP;
Norimitsu Kaimai, Kanagawa-ken, JP;
Shigeaki Kobayashi, Kanagawa-ken, JP;
Kotaro Kimishima, Kanagawa-ken, JP;
Sadakatsu Suzuki, Saitama-ken, JP;
Satoshi Ueki, Tokyo, JP;
Kazuhiro Yamada, Tochigi-ken, JP;
Tonen Chemical Corporation, Tokyo, JP;
Abstract
A microporous composite membrane comprising a microporous polyolefin membrane and a polypropylene-based coating layer formed on at least one surface of the microporous polyolefin membrane, the polypropylene having a mass-average molecular weight within a range of 5,000-500,000, and solubility of 0.5 g or more in 100 g of toluene at a temperature of 25° C., and the microporous composite membrane having air permeability (converted to the value at 25-μm thickness) of 50-10,000 seconds/100 cc.