High tenacity acrylonitrile fibers and a process for production

Details High tenacity acrylonitrile fibers and a process for production High tenacity acrylonitrile fibers and a process for production

1987-04-17

1989-08-29

Kendell, Lorraine T.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428400, 526341, D02G 300

Patent

active

048616591

ABSTRACT:
High tenacity acrylonitrile fibers are provided.
The high tenacity acrylonitrile fibers comprise acrylonitrile polymers composed mainly of acrylonitrile having an intrinsic viscosity of at least 2.5 to 3.5 and having a degree of crystalline orientation measured by wide-angle X-ray diffraction within a range of 93-97%, a tensile strength of at least 10 g/d, an initial modulus of at least 180 g/d, a knot strength of 2.2 g/d and a surface smoothness.
A process for production of the high tenacity acrylonitrile fiber which comprises once extruding an acrylonitrile polymer solution having an intrinsic viscosity of 2.5 to 3.5 in air or in an inert gas through a spinning nozzle, then introducing into a coagulating bath, subjecting the resulting coagulated filaments to washing with water, drawing and drying, and then drawing the filaments under a drawing tension of about 1.0 to 2.5 g/d with dry heating at about 160.degree. to about 250.degree. C. to make the total drawing magnification about 10 or 25 times per an initial length of the coagulated filaments.

REFERENCES:
patent: 3088188 (1963-05-01), Knudsen
patent: 4421708 (1983-12-01), Reichardt et al.
patent: 4446206 (1984-05-01), Fester et al.
patent: 4497868 (1985-02-01), Reinehr et al.
patent: 4535027 (1985-08-01), Kobashi et al.

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