Process for producing aromatic polyimide filaments

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

D - Textiles, Paper

01

F

18/599

D01F 6/74 (2006.01) C08G 73/10 (2006.01) C08L 79/08 (2006.01)

Patent

CA 1154921

PROCESS FOR PRODUCING AROMTIC POLYIMIDE FILAMENTS ABSTRACT OF THE DISCLOSURE Aromatic polyimide 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; solidifying the filamentary dope solution stream by removing the solvent therefrom to provide at least one undrawn filament, and; drawing the undrawn filament at a temperature of 20 to 600°C at a draw ratio of 1.5 to 5Ø

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