Asymmetric hollow acrylic fibers

Details Asymmetric hollow acrylic fibers Asymmetric hollow acrylic fibers

1976-08-13

1978-04-11

Kendell, Lorraine T.

Stock material or miscellaneous articles

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

Rod, strand, filament or fiber

210 22R, 210500M, 210500R, 428400, D02G 300

Patent

active

040840360

ABSTRACT:
Asymmetric acrylic hollow fibers for use in separatory processes as a selective membrane. The fibers are highly permeable and exhibit a high degree of selectivity in discriminating mixtures into their various components. The fibers are formed by extruding an acrylic polymer solution through an annular orifice while simultaneously injecting a coagulating fluid into the bore of the fiber extrudate as it is formed. The extrusion may be directly into a coagulating bath maintained at a temperature of from 60.degree. to 80.degree. C. or alternatively the freshly extruded fiber may be first passed through an air space (evaporation zone) and thence into the coagulating bath. Following coagulation, the fibers are water washed to remove residual solvent.

REFERENCES:
patent: 3674628 (1972-07-01), Fabre
patent: 3871950 (1975-03-01), Hashino et al.
patent: 3930105 (1975-12-01), Christen

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