AROMATIC HALOSULFONYL ISOCYANATE COMPOSITIONS

The present invention provides a polymer composition comprising structural units derived from an aromatic halosulfonyl isocyanate having structure I wherein "m" is an integer from 2 to 5; "n" is an integer from 1 to 5; Ar is a C3-C40 aromatic radical which is free of aliphatic carbon-hydrogen bonds; and X is halogen. The polymer composition comprising aromatic halosulfonyl isocyanate are useful as membranes. In addition the present invention provides a separation membrane comprising a polymer composition comprising structural units derived from the aromatic halosulfonyl isocyanate having structure I.