Process for producing aromatic polyimide hollow filaments

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

1982-04-02

1984-07-17

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264561, 264184, 2642095, B29D 2700

Patent

active

044605269

ABSTRACT:
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). ##STR1## 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.

REFERENCES:
patent: 3862897 (1975-01-01), Gattus et al.
patent: 3899309 (1975-08-01), Hoehn et al.
patent: 3985934 (1976-10-01), Farrissey et al.
patent: 4214071 (1980-07-01), Alvino et al.
patent: 4290936 (1981-09-01), Sasaki et al.
patent: 4307135 (1981-12-01), Fox
patent: 4370290 (1983-01-01), Makino et al.

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