Hollow fiber and a process for preparation thereof

Abstract

Disclosed herein is a process for preparing a hollow fiber comprising the steps of providing a dope solution comprising polyamide imide (PAI), providing an aqueous bore solution comprising polyethylene imine (PEI), extruding the dope solution in an cross-sectional annular shape and ejecting the bore solution in the center of the annular shape, allowing the PAI and the PEI to react, thereby forming an internal surface layer comprising the cross-linked reaction product, and forming a polyamide Thin Film Composite (TFC) layer by interfacial reaction of aqueous di- or triamine compound and organic di- or triacylhalide compound on the internal surface layer comprising the cross-linked reaction product.

Dependencies are inferred from the claim text.