Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ
Patent
1981-06-04
1982-12-07
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
2105002, 264185, 264203, 264561, 428398, B29D 2700
Patent
active
043626777
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 original length, and coagulating the fiber in a coagulation bath at a temperature within the range specified below:
REFERENCES:
patent: 4134837 (1979-01-01), Yamashita et al.
patent: 4220543 (1980-09-01), Yamashita et al.
patent: 4269713 (1981-05-01), Yamashita et al.
Kawai Syuji
Kubotsu Akira
Tanaka Taku
Tanii Hirokuni
Yamashita Shuzo
Kramer Barry
Kuraray Co. Ltd.
Woo Jay H.
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