Process for producing wholly aromatic polyamide fibers of high s

Details Process for producing wholly aromatic polyamide fibers of high s Process for producing wholly aromatic polyamide fibers of high s

1976-09-23

1978-02-21

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

260 78A, 260 78R, 260 78SC, 264210F, 264236, 264205, D01D 512

Patent

active

040752690

ABSTRACT:
An improved process for preparing wholly aromatic polyamide fibers of high performance charcteristics is provided. The process includes the steps of providing a spinning solution of a wholly aromatic polyamide, the polyamide having a sulfur content as sulfonic acid and/or sulfonate groups attached to the aromatic nuclei of at least 0.5 percent by weight based on the weight of the polyamide; spinning the spinning solution of the wholly aromatic polyamide to produce an as-spun fiber having an inherent viscosity of at least 1.0; and heat treating the as-spun fiber under sufficient tension to maintain a constant length or to elongate the fiber up to about 5 percent of the as-spun length while heating within a range of about 150.degree. C. to about 650.degree. C. The resulting fibers have a tenacity of at least 15 grams per denier, an elongation of at least 1.5 percent, and an initial modulus of at least 400 grams per denier.

REFERENCES:
patent: 3821168 (1974-06-01), Keil
patent: 3849376 (1974-11-01), Wolf et al.
patent: 3862088 (1975-01-01), Wolf et al.
patent: 3869429 (1975-03-01), Blades
patent: 3869430 (1975-03-01), Blades
patent: 3870685 (1975-03-01), Jones et al.
patent: 3901854 (1975-08-01), Jones
patent: 3923750 (1975-12-01), Jones
patent: 3931119 (1976-01-01), Leblanc
patent: 3991016 (1976-11-01), Morgan

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