Process for producing aromatic imide polymer hollow filaments

Details Process for producing aromatic imide polymer hollow filaments Process for producing aromatic imide polymer hollow filaments

D - Textiles, Paper

01

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18/15, 18/599

D01D 5/247 (2006.01) B01D 69/08 (2006.01) B01D 71/64 (2006.01) C08G 73/10 (2006.01) D01D 5/24 (2006.01)

Patent

CA 1246308

PROCESS FOR PRODUCING AROMATIC IMIDE POLYMER HOLLOW FILAMENTS ABSTRACT OF THE DISCLOSURE An aromatic imide polymer hollow filament having an excellent gas separating property is produced by a process comprising the steps of: (1) dissolving an aromatic imide copolymer comprising (A) 20 to 85 molar % of recurring units of the formula (I): Image (I) (B) 10 to 35 molar % of recurring units of the formula (II): Image (II) and (C) 5 to 55 molar % of recurring units of the formula (III): Image (III), wherein R represents a divalent radical of the formula (IV) or (V): Image (IV) and Image (V) wherein R1 and R2 respectively represent, a hydrogen atom, alkoxyl radical having 1 to 3 carbon atoms or alkyl radical having 1 to 3 carbon atoms, in a solvent consisting essentially of at least one phenolic compound to provide a spinning dope solution; (2) extruding the dope solution through a spinneret having at least one hollow filament spinning orifice, to provide at least one hollow filamentary stream of the dope solution, and (3) introducing the dope solution hollow stream into a coagulating bath comprising at least one polar solvent which is compatible with the phenolic compound but not capable of dissolving the aromatic imide copolymer, to solidify the hollow stream into a hollow filament.

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