Patent ID: 6986844

Claim:
A microporous hollow fiber support membrane comprising solvent-resistant polybenzimidazole having the following characteristics: (i) surface pores less than one micron in diameter; (ii) nitrogen permeance of at least 5 m 3 /m 2 ·hr·atm; (iii) tensile strength of at least 100 g/fil; (iv) elongation at break of at least 10%; (v) an inner diameter of from about 200 to about 1000 microns; and (vi) a wall thickness of from about 30 to about 200 microns wherein said hollow fiber support membrane has been rendered solvent-resistant by cross-linking with an alkyl halide selected from the group consisting of where X is selected from Br and Cl, n is an integer of from 1 to 11, a is an integer of from 1 to 10, b is a number of from 0 to 4, and c is a number of from 0 to 6.