Poly(P-phenyleneterephthalamide) fibers

Details Poly(P-phenyleneterephthalamide) fibers Poly(P-phenyleneterephthalamide) fibers

1984-08-31

1985-12-24

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

521184, C08G 2020

Patent

active

045607435

ABSTRACT:
Poly(p-phenyleneterephthalamide) fibers having a very high tensile strength is described. The fibers consist essentially of poly(p-phenyleneterephthalamide) having an inherent viscosity of at least 5 dl/g as determined at 25.degree. C. in sulfuric acid having a concentration of 98 wt. % at a polymer concentration of 0.5 g/dl. The fibers are composed of single filaments of 0.5 to 3 denier, wherein the single filament tensile strength is at least 35 g/denier. The macrovoid number, hereinbefore defined, of the fibers is not more than 10 per 100 mm. The asymmetry, hereinbefore defined, of the fibers is not more than 0.2.

REFERENCES:
patent: 3819587 (1974-06-01), Kwoleck
patent: 3869430 (1975-03-01), Blades
patent: 4016236 (1977-04-01), Nagasawa et al.
patent: 4374977 (1983-02-01), Fujiwara et al.
patent: 4374978 (1983-02-01), Fujiwara et al.

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