Process for producing aromatic polyimide hollow filaments

Details Process for producing aromatic polyimide hollow filaments Process for producing aromatic polyimide hollow filaments

D - Textiles, Paper

01

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D01D 5/24 (2006.01) B01D 69/08 (2006.01) B01D 71/64 (2006.01)

Patent

CA 1166414

PROCESS FOR PRODUCING AROMATIC POLYIMIDE HOLLOW FILAMENTS ABSTRACT OF THE DISCLOSURE Aromatic polyimide hollow fibers having an enhanced mechanical strength are produced by a process comprising the steps of: preparing a spinning dope solution of at least one aromatic polyimide having 90 molar % or more of a recurring unit of the formula (I). Image wherein R is a divalent aromatic radical, in a phenolic solvent; converting the dope solution into at least one filamentary stream thereof; and introducing the filamentary dope solution stream into a coagulating liquid having a coagulating rate coefficient of 1.5 microns/sec for the dope solution, to provide rigid hollow filaments.

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