Fabrication of a fluoropolymer hollow fiber having a defect-free

Details Fabrication of a fluoropolymer hollow fiber having a defect-free Fabrication of a fluoropolymer hollow fiber having a defect-free

1993-12-17

1996-02-13

Spear, Frank

Liquid purification or separation

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Material

21050039, 264 41, B01D 6908

Patent

active

054909317

ABSTRACT:
Asymmetric fluoropolymer hollow fibers having a thin, dense, inner separation layer that is essentially defect-free. In the process of this invention, a fluoropolymer dope is spun into a hollow fiber using a hollow fiber die, a core solvent, preferably comprising water, and a coagulation bath, preferably comprising a water-acetone mixture. Due to solubility and surface tension differences, the outer layer of the fiber does not coagulate quickly enough to form a dense layer, and remains porous, but the core solvent causes the inner surface of the hollow fiber to coagulate into a thin, dense, defect-free layer.

REFERENCES:
patent: 4666607 (1987-05-01), Josefiak et al.
patent: 4780205 (1988-10-01), Murakami et al.
patent: 4929405 (1990-05-01), Kohn
patent: 5055116 (1991-10-01), Kohn et al.
patent: 5209883 (1993-05-01), Chung et al.

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