Ethylene-vinyl alcohol copolymer membrane and a method for produ

Details Ethylene-vinyl alcohol copolymer membrane and a method for produ Ethylene-vinyl alcohol copolymer membrane and a method for produ

1979-08-31

1981-05-26

Van Balen, William J.

Liquid purification or separation

Filter

Material

264 41, 428398, B01D 3918, B01D 3100, B01D 1300

Patent

active

042697131

ABSTRACT:
There is described an ethylene-vinyl alcohol copolymer membrane comprising at least a skin layer on its surface and a porous layer supporting the skin layer. The porous layer, when the membrane is observed in the dry state with an electron microscope, contains vacuoles or voids, which present a mono- or multi-layer structure and have straight-line lengths corresponding to 20-99% of the whole thickness of the membrane. In addition, the polymer portion of the porous layer has micropores with an average pore diameter of 0.1-5 microns and the membrane has a porosity of 60-90%.

REFERENCES:
patent: 3817880 (1974-06-01), Kreider
patent: 3907675 (1975-09-01), Chapurlat et al.
patent: 3957935 (1976-05-01), Staude
patent: 4061821 (1977-12-01), Hayano et al.
patent: 4134837 (1979-01-01), Yamashita et al.

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