Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1997-08-08
1999-02-16
Dixon, Merrick
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
2642093, 26421115, 26421121, 26421123, 26421113, 427245, 2105003, B29C 4788
Patent
active
058716807
ABSTRACT:
A process for the preparation of anisotropic hollow fibers useful as permselective separation membranes and for producing composite membranes thereof, involves extruding a spinning dope through a spinneret that extends into a coagulation chamber maintained at subatmospheric pressure, conveying the nascent hollow fiber through a column that extends into the reduced pressure chamber, and contains at least two different abutting liquids arranged in sequence. An apparatus for conducting the process includes the vacuum chamber, the spinneret and the column that extends into the vacuum chamber and is equipped with entrance and exit ports for introduction and removal of at least two abutting liquid coagulation media.
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Journal of Membrane Science, 71 (1992) 81-96; Pore size control technique in the spinning of polysulfone hollow fiber ultrafiltration membranes, Doi, Desalination, 80 (1991), 167-180.
Bikson Benjamin
Bolan Thomas Anthony
Macheras James Timothy
Dixon Merrick
Follett Robert J.
Praxair Technology Inc.
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