Liquid purification or separation – Filter – Material
Patent
1976-06-10
1979-01-16
Anderson, Philip
Liquid purification or separation
Filter
Material
264 41, 264216, 264DIG62, B29D 2704
Patent
active
041348370
ABSTRACT:
Ethylene-vinyl alcohol copolymer membranes characterized by constituent particles having an average diameter within the range of from 100 to 10,000 Angstrom units, determined under an electron microscope for the dry membrane, bonded to each other, wherein the membrane is substantially free from pores in excess of from 2 microns in diameter.
Such a membrane has a permeability to water of 10 to 200 .times. 10.sup.-16 cm.sup.2 and to vitamin B.sub.12 of not less than 0.8 .times. 10.sup.-7 cm.sup.2 per second, and being of particular value as a membrane for the dialysis of blood.
The membrane is obtained by dissolving an ethylenevinyl alcohol copolymer in a solvent consisting essentially of dimethylsulfoxide or dimethylacetamide and causing the resulting solution to coagulate from an aqueous coagulation bath under mild conditions such that the coagulation time as defined in the specification is not less than 3 seconds.
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Nagata Shiro
Takakura Koichi
Yamashita Shuzo
Anderson Philip
Kuraray Co. Ltd.
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