Fabrication of fluoropolymer hollow fibers for asymmetric membra

Details Fabrication of fluoropolymer hollow fibers for asymmetric membra Fabrication of fluoropolymer hollow fibers for asymmetric membra

1991-04-17

1993-05-11

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264129, 264184, 264205, 2642091, 26421116, 264558, 427245, D01D 5247

Patent

active

052098834

ABSTRACT:
Asymmetric hollow fibers comprising a fluoropolymer, and a process for making such fibers. The hollow fibers are useful for making fluid separation membranes, especially gas separation membranes. In one embodiment of the process of this invention, a polymer dope having a viscosity of about 3000 poise or greater is prepared by solvating the polymer in a solvent system containing about 40%-90% N-methyl-2-pyrrolidone and about 60%-10% propionic acid by weight. The dope is dry-jet wet-spun into hollow fibers using a water-NMP core solvent. The fibers are coagulated in methanol. The fibers are then coated with a highly permeable material.

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patent: 4881954 (1989-11-01), Bikson et al.
patent: 5074891 (1991-12-01), Kohn et al.

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