Method for making void-free acrylic fibers

Details Method for making void-free acrylic fibers Method for making void-free acrylic fibers

1973-05-21

1976-01-13

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264211, D01F 618

Patent

active

039325776

ABSTRACT:
Method for making substantially void-free fibers having improved abrasion resistance wherein a spinning dope is formed by dissolving a dry acrylonitrile-containing polymer in a solvent/water mixture to form a spin dope which is wet spun at a temperature within the range of about 40.degree.C to about 75.degree.C. More specifically, the dope will contain from about 20 to about 28 weight percent of the polymer dissolved in a solvent containing about 1 to 8 weight percent water, based on the weight of the dope, with the solvent and water being mixed prior to contact with the polymer. The presence of water in the solvent brings about an improvement of the filamentary gel structure which results in fibers having enhanced durability and abrasion resistance.

REFERENCES:
patent: 2752318 (1956-06-01), DeWitt
patent: 2858288 (1958-10-01), Ehlers et al.
patent: 3313758 (1967-04-01), Apperson et al.
patent: 3706828 (1972-12-01), Tzentis

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