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:
Sep. 28, 2010
Filed:
Jul. 23, 2007
Yoji Kase, Chiba, JP;
Toshimune Yoshinaga, Chiba, JP;
Kenji Fukunaga, Chiba, JP;
Harutoshi Hoshino, Chiba, JP;
Yoji Kase, Chiba, JP;
Toshimune Yoshinaga, Chiba, JP;
Kenji Fukunaga, Chiba, JP;
Harutoshi Hoshino, Chiba, JP;
UBE Industries, Ltd., Ube-Shi, JP;
Abstract
The present invention relates to an asymmetric hollow-fiber gas separation membrane made of a polyimide having a specific repeating unit, an improved tensile elongation at break of 15% or more as a hollow-fiber membrane itself, an oxygen gas permeation rate (P') of 4.0×10cm(STP)/cm·sec·cmHg or more and a gas ratio of permeation rate of oxygen to nitrogen (P′/P′) of 4 or more that are measured at 50° C., a gas separation method and a gas separation membrane module using the asymmetric hollow-fiber gas separation membrane. In addition, the present invention relates to an asymmetric hollow-fiber gas separation membrane obtained by heat-treating the asymmetric hollow-fiber gas separation membrane at a maximum temperature of from 350 to 450° C. The asymmetric hollow-fiber gas separation membrane has sufficient mechanical strength even after the heat-treatment at a maximum temperature of from 350 to 450° C.