Patent ID: 7563484
Filing Date: 2009-07-21
Classification: C08G,C08J,D01F,H01B

Abstract:
1. A method for preparing an integrally skinned, gas permeable asymmetric hollow fiber which comprises the steps of: (a) forming a solution of the emeraldine base (EB) form of polyaniline having between 15% and 30% w/w of polyaniline; (b) adding a gel inhibitor to the solution; (c) extruding the solution through the outer bore of a hollow fiber spinnerrette nozzle; (d) passing the solution through an air-gap; and (e) directing the extruded solution into a coagulation bath containing a nonsolvent for polyaniline, whereby an asymmetric hollow fiber having a permeable dense skin in the vicinity of the surfaces thereof in contact with the nonsolvent and a lower-density porous interior support portion is formed.