Wet spinning of solid polyamic acid fibers

Details Wet spinning of solid polyamic acid fibers Wet spinning of solid polyamic acid fibers

1990-06-26

1991-06-11

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421115, 26421116, 26421117, 264234, 264236, 264345, 264347, D01F 674

Patent

active

050230344

ABSTRACT:
The invention is a process for the production of solid aromatic polyamic acid and polyimide fibers from a wet gel or coagulation bath wet get using N,N-dimethylacetamide (DMAc) solutions of the polyamic acid derived from aromatic dianhydrides such as 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) and aromatic diamines such as 4,4'-oxydianiline (4,4'-ODA). By utilizing the interrelationship between coagulation medium and concentration, resin inherent viscosity, resin % solids, filament diameter, and fiber void content, it is possible to make improved polyamic acid fibers. Solid polyimide fibers, obtained by the thermal cyclization of the polyamic acid precursor, have increased tensile properties compared to fibers containing macropores from the same resin system.

REFERENCES:
patent: 4056598 (1977-11-01), Galasso et al.

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