Aromatic polyimide and gas separation

Details Aromatic polyimide and gas separation Aromatic polyimide and gas separation

1996-06-06

1998-04-28

Hampton-Hightower, P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528128, 528171, 528172, 528173, 528174, 528179, 528180, 528182, 528183, 528188, 528220, 528226, 528229, 528350, 428357, 428364, 428396, 4284111, 4284735, 55 16, 55158, C08G 7310

Patent

active

057445753

ABSTRACT:
An aromatic polyimide having a recurring unit of the formula (I): ##STR1## wherein Ar is a divalent aromatic group having one or two benzene rings which has a sulfonate group of --SO.sub.3 H, --SO.sub.3 M, and --SO.sub.3 N(L).sub.4 on the ring, wherein M is an alkali metal and L is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, is favorably employed in the form of a semipermeable film for gas separation.

REFERENCES:
patent: 5145940 (1992-09-01), Wernet et al.
patent: 5198316 (1993-03-01), Wernet et al.

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