Process for producing a hollow fiber membrane having a hydrophob

Details Process for producing a hollow fiber membrane having a hydrophob Process for producing a hollow fiber membrane having a hydrophob

1997-12-24

1999-12-14

Walker, W. L.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

2642091, 264558, 264559, 264561, 264562, 264563, 427 23, B29C 6500

Patent

active

060012889

ABSTRACT:
A process for producing a hollow fiber membrane, a hollow fiber membrane, and a dialyzer of hollow fiber membrane type is provided. The hollow fiber membrane is highly biocompatible, and the production process is quite simple and inexpensive. In the process of the invention, the hollow fiber membrane is produced in a system wherein a polymer-containing spinning solution is extruded from a tube-in-tube type orifice of a spinner in a coagulation solution to form the hollow fiber membrane. The polymer-containing spinning solution is extruded from the outer tube of the orifice to form a cylindrical filament having an inner bore and a core solution is ejected from the inner tube of the orifice into the inner bore of the filament for coagulation of the filament. The filament is directly extruded into the coagulation solution or extruded into air and then drawn to the coagulation solution. The core solution is supplemented with a hydrophobic modifier such as vitamin E and a surfactant and the resulting hollow fiber membrane contains the hydrophobic modifier on its inner surface.

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