Process for post-spin finishing of polybenzoxazole fibers

Details Process for post-spin finishing of polybenzoxazole fibers Process for post-spin finishing of polybenzoxazole fibers

1992-08-13

1993-12-28

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264233, 264234, 264235, 264340, 264345, 264346, D01D 1002, D01D 1006

Patent

active

052737039

ABSTRACT:
Improved polybenzoxazole fibers are made by a process for finishing a spun and drawn dope fiber, which contains polybenzoxazole polymer and a solvent acid, including the steps of: (a) coagulating the dope fiber in an aqueous coagulant: (b) washing the coagulated fiber with an aqueous washing fluid for less than 72 hours under conditions such that the fiber contains no more than 8,000 ppm residual solvent acid (1 ppm=1 part per million, by weight); (c) drying the fiber at a temperature of no more than 300.degree. C. until it retains no more than about 2 weight percent residual moisture; and (d) heat-treating the fiber at a temperature of at least about 300.degree. C. under tension.

REFERENCES:
patent: 4487735 (1984-12-01), Chenevey et al.
patent: 4533693 (1985-08-01), Wolfe et al.
patent: 4581437 (1986-04-01), Mammone
patent: 4772678 (1988-09-01), Sybert et al.
patent: 4876077 (1989-10-01), Murakami
patent: 4915984 (1990-04-01), Murakami
patent: 4977223 (1990-12-01), Arnold et al.
patent: 4985193 (1991-01-01), Allen
Chemical Abstract 111:196226f (p. 59)(1989).
W. W. Adams et al., AFWAL-TR-86-4011 Processing Properties, Structure, and Morphology of PBO and ABPBO Polymer Fibers, Aug. 1986.
English Translation of Japan 2-84,509 (Published Mar. 26, 1990).

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