ASYMMETRIC GAS SEPARATION MEMBRANE, AND GAS SEPARATION METHOD

摘要

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.