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. 02, 2013
Filed:
Sep. 30, 2009
Toshimune Yoshinaga, Ichihara, JP;
Makoto Nakamura, Ichihara, JP;
Tomonori Kanougi, Ichihara, JP;
Yoji Kase, Ichihara, JP;
Kenji Fukunaga, Ichihara, JP;
Toshimune Yoshinaga, Ichihara, JP;
Makoto Nakamura, Ichihara, JP;
Tomonori Kanougi, Ichihara, JP;
Yoji Kase, Ichihara, JP;
Kenji Fukunaga, Ichihara, JP;
Ube Industries, Ltd., Ube-shi, JP;
Abstract
There is disclosed an asymmetric gas separation membrane exhibiting both improved gas separation performance and improved mechanical properties, which is made of a soluble aromatic polyimide comprised of a repeating unit represented by general formula (1): wherein B in general formula (1) B comprises 10 to 70 mol % of tetravalent unit B1 represented by general formula (B1) and 90 to 30 mol % of tetravalent unit B2 represented by general formula (B2), and A in general formula (1) comprises 10 to 50 mol % of bivalent unit A1 represented by general formula (A1a) or the like and 90 to 30 mol % of bivalent unit A2 represented by general formula (A2a) or the like.