Method of preparing poly (p-phenyleneterephthalamide) yarns of i

Details Method of preparing poly (p-phenyleneterephthalamide) yarns of i Method of preparing poly (p-phenyleneterephthalamide) yarns of i

1988-03-02

1989-08-22

Lorin, Hubert

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264205, 2642102, 2642107, 2642108, 26421114, 26421115, 264233, 264232, 264340, D01D 506, D01F 660

Patent

active

048593931

ABSTRACT:
Poly(p-phenyleneterephthalamide) yarn of improved fatigue resistance is prepared by spinning the polymer in sulfuric acid through an air gap into an aqueous coagulating bath to produce a coagulated yarn, maintaining the coagulating bath at a temperature of at least 20.degree. C., washing and neutralizing the yarn while it is under a tension of from 0.2 to 0.4 grams per denier, and drying the yarn at a temperature below 200.degree. C. while it is maintained under a tension of 0.05 to 0.2 grams per denier.

REFERENCES:
patent: 3767756 (1973-10-01), Blades
patent: 3869430 (1975-03-01), Blades
patent: 4048279 (1977-09-01), Zimmerman
patent: 4340559 (1982-07-01), Yang
patent: 4374977 (1983-02-01), Fujiwara et al.
patent: 4726922 (1988-02-01), Cochran et al.

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