Process for producing hollow fiber semi-permeable membranes

Details Process for producing hollow fiber semi-permeable membranes Process for producing hollow fiber semi-permeable membranes

1987-08-06

1989-03-14

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264 83, 264561, 264562, 264182, 264184, 264185, 264205, 264206, 2642091, 26421115, 26421116, 264234, 264345, 264186, 21050023, 21050027, D01D 524, D01F 628

Patent

active

048122696

ABSTRACT:
Processes for producing semipermeable membranes in the form of hollow fibers are disclosed including extruding a solution of a block copolymer including at least one hydrophilic polymer and at least one hydrophobic polymer while simultaneously injecting a gaseous or vaporous center medium into the center bore of the hollow fiber extrudate, including coagulating the extrudate so formed therefrom. The preferred process includes using air or the components of air as the center medium and employing a polyethyleneoxide-polycarbonate block copolymer to form the hollow fiber membranes.

REFERENCES:
patent: 3728255 (1975-12-01), Mrilkovich et al.
patent: 3950257 (1976-04-01), Ishii et al.
patent: 4051300 (1977-09-01), Klein et al.
patent: 4100238 (1978-07-01), Shinomura
patent: 4439322 (1984-03-01), Soroda et al.
patent: 4535028 (1985-08-01), Yokoji et al.
patent: 4705632 (1987-11-01), Yojita et al.
patent: 4749619 (1988-06-01), Harttig et al.

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