Process of making fibers of sulfonated poly(p-phenylene terephth

Details Process of making fibers of sulfonated poly(p-phenylene terephth Process of making fibers of sulfonated poly(p-phenylene terephth

1991-06-06

1993-01-26

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421114, 264233, D01D 506, D01F 660

Patent

active

051820676

ABSTRACT:
Fiber made from PPD-T with 0.5 to 3.0% sulfur as bound sulfonic acid or sulfonate groups, is disclosed. The fiber has inherent viscosity greater than 4.5, yarn tenacity greater than 20 grams per denier, heat-aged strength retention of greater than 90%, and dipped cord strength greater than 18 gram per denier. The process for making the fiber includes PPD-T sulfonation by exposure to high concentration sulfuric acid in dope preparation under carefully controlled temperature and time.

REFERENCES:
patent: 3671542 (1972-06-01), Kwolek
patent: 3767756 (1972-06-01), Blades
patent: 4016236 (1977-04-01), Nagasawa et al.
patent: 4075269 (1978-02-01), Jones, Jr. et al.
patent: 4162346 (1978-07-01), Jones, Jr. et al.
patent: 4859393 (1989-08-01), Yang et al.

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