Process for producing aromatic polyimide filaments

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

1981-05-08

1983-01-25

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264203, 264205, 2642108, D01F 600

Patent

active

043702902

ABSTRACT:
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): ##STR1## 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.degree. to 600.degree. C. at a draw ratio of 1.5 to 5.0.

REFERENCES:
patent: 3929691 (1975-12-01), Avard
patent: 3961009 (1976-06-01), Yoda et al.
patent: 3985934 (1976-10-01), Farrissey et al.
patent: 4214071 (1980-07-01), Alvino et al.

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