Processes for producing polybenzazole fibers

Details Processes for producing polybenzazole fibers Processes for producing polybenzazole fibers

1996-09-05

1998-06-30

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421115, 26421116, 26421117, 264233, D01D 506, D01D 1002, D01D 1006, D01F 626

Patent

active

057729425

ABSTRACT:
The present invention provides processes for producing polybenzazole fibers where a spinning dope containing a polybenzazole polymer in an acid solvent is extruded through a spinning nozzle, followed by coagulation in a coagulating medium and washing with a fluid capable of dissolving the acid solvent; thereafter, in one process, the fiber obtained by the coagulation under specific conditions and the subsequent washing is dried in a heating zone with at least 80% part based on the total length thereof being set at a temperature of 240.degree. C. or higher, and in the other process, the fiber obtained by the coagulation under the conventional conditions and the subsequent washing is neutralized with a basic solution, followed by washing with a fluid capable of dissolving the basic solution, and then dried at a specific temperature set depending upon the residual moisture content in the fiber. The present invention further provides a polybenzazole intermediate predried fiber having a residual moisture content of about 25% and exhibiting a single peak for liquid freezing in the fiber over a temperature range of from 20.degree. to -70.degree. C. when measured by differential scanning calorimetry (DSC).

REFERENCES:
patent: 5019316 (1991-05-01), Ueda et al.
patent: 5273703 (1993-12-01), Alexander et al.
patent: 5296185 (1994-03-01), Chau et al.
patent: 5429787 (1995-07-01), Im et al.
Abstract of Japan 7-197,307 (Published Aug. 1, 1995).

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