Ethylene-vinyl alcohol copolymer hollow fiber membranes and meth

Details Ethylene-vinyl alcohol copolymer hollow fiber membranes and meth Ethylene-vinyl alcohol copolymer hollow fiber membranes and meth

1980-04-21

1982-03-02

Kendell, Lorraine T.

Liquid purification or separation

Filter

Material

264 41, 428376, 428398, B29D 2704, D02G 300

Patent

active

043177298

ABSTRACT:
A hollow fiber membrane made of an ethylene-vinyl alcohol copolymer is provided, which is characterized in that, when observed in a dry state with an electron microscope, the hollow fiber membrane has at least one dense, active layer (or skin layer) on the inside and/or outside surface thereof and further a three-layered structure comprising two layers respectively contacting the inside and outside surfaces and each consisting of a plurality of particles bonded together and having particle sizes of 0.01 to 2 microns and a substantially particle-free homogeneous layer lying between the two layers.
A method of producing such hollow fiber membranes is also provided comprising spinning a spinning solution prepared by dissolving an ethylene-vinyl alcohol copolymer in a solvent mainly consisting of dimethyl sulfoxide, dimethylacetamide, pyrrolidone, N-methylpyrrolidone or a mixture of these through a spinneret for hollow fiber production while simultaneously introducing a coagulating liquid through the central aperture of said spinneret, passing the spun fiber through a gaseous atmosphere such that the fiber is drawn to 3 to 30 times its extrusion rate, and coagulating the fiber in a coagulation bath at a temperature within the range specified below:

REFERENCES:
patent: 4071454 (1978-01-01), Yamamoto et al.
patent: 4134837 (1979-01-01), Yamashita et al.
patent: 4220543 (1980-09-01), Yamashita et al.

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