Process for the preparation of polybenzoxazole and polybenzothia

Details Process for the preparation of polybenzoxazole and polybenzothia Process for the preparation of polybenzoxazole and polybenzothia

1996-06-24

1999-11-02

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Treating shaped or solid article

To remove entrained material from article

264345, D01F 626

Patent

active

059764473

ABSTRACT:
A continuous process for heating a polybenzazole or polybenzothiazole filament, which includes the step of heating the filament to a temperature of at least 100.degree. C. but no greater than 290.degree. C. while applying a tension thereto of at least 3.5 grams per denier, which is carried out at a line speed of at least 100 m/minute; and there is no prior or subsequent heating of the fiber to any temperature greater than 300.degree. C. It has been discovered that placing tension on the filament while it is dried increases its tensile modulus without a significant decrease in its tensile strength.

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patent: 3869430 (1975-03-01), Blades
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patent: 4554119 (1985-11-01), Chenevey
patent: 4581437 (1986-04-01), Mammone
patent: 5273703 (1993-12-01), Alexander et al.
patent: 5288445 (1994-02-01), Tani et al.
patent: 5288452 (1994-02-01), Yabuki
patent: 5411694 (1995-05-01), Alexander et al.
patent: 5417915 (1995-05-01), Chau et al.
Chau et al., Abstract submitted of meeting of the American Physical Society, entitled "Strain Rate Sensitivity and Strain Hardening Behavior of PBO Fiber", Mar. 21-25, 1994.

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