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

1993-11-18

1995-05-02

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

054116945

ABSTRACT:
Improved polybenzoxazole fibers are made by a process for finishing a spun and drawn dope fiber, which contains polybenzoxazole polymer and polyphosphoric acid, including the steps of:

REFERENCES:
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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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