Process for producing an acrylic fiber having high fiber charact

Details Process for producing an acrylic fiber having high fiber charact Process for producing an acrylic fiber having high fiber charact

1987-07-28

1990-02-20

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

264182, 264206, 2642806, 2642107, 2642108, 26421115, 26421116, D01F 618

Patent

active

049024523

ABSTRACT:
A process for producing an acrylic fiber comprising the steps of:
(a) dissolving a polymer having a weight-average molecular weight of at least 5.times.10.sup.5 and containing at least 80 wt. % acrylonitrile in a solvent comprising dimethylformamide or dimethylacetamide at a polymer concentration of 5-15 wt. % to provide a spinning solution having a viscosity of 500-1,500 poises at 45.degree. C.;
(b) extruding the solution into a gaseous medium to form filaments;
(c) introducing the filaments into a coagulation bath comprising water and at least one of dimethylformamide and dimethylacetamide at 0.degree. C. or below; and
(d) stretching the coagulated filaments to a draw ratio of at least 3 to provide an acrylic fiber having at least 90% X-ray orientation and an X-ray crystallinity parameter of up to 1 degree. The resulting acrylic fiber has high strength and high modulus.

REFERENCES:
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patent: 3080210 (1963-03-01), Ucci
patent: 3088793 (1963-05-01), Knudsen et al.
patent: 3558761 (1971-01-01), Tabara et al.
patent: 4205037 (1980-05-01), Fujimatsu
patent: 4535027 (1985-08-01), Kobashi et al.
patent: 4658004 (1987-04-01), Kobashi et al.
patent: 4659529 (1987-04-01), Kobashi et al.

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