Ethylene-vinyl alcohol membranes having improved properties and

Details Ethylene-vinyl alcohol membranes having improved properties and Ethylene-vinyl alcohol membranes having improved properties and

1978-11-22

1980-09-02

Anderson, Philip

Liquid purification or separation

Filter

Material

264 41, 521 61, 521 62, 521 63, 521 64, 521134, B29D 2704

Patent

active

042205433

ABSTRACT:
A membrane made of a composition containing essentially two kinds of ethylene-vinyl alcohol copolymers with different ethylene unit contents and the membrane has such a microstructure that there are at least one active layer and a porous layer thereunder, the porous layer comprises mono- or multi-layer of a plurality of cylindrical voids and a plurality of spherical voids therein and the membrane is of a porosity of 70 to 95%.

REFERENCES:
patent: 3642668 (1972-02-01), Bailey et al.
patent: 3847845 (1974-11-01), Tada et al.
patent: 3907675 (1975-09-01), Chapurlat et al.
patent: 3963618 (1976-06-01), Muir
patent: 4134837 (1979-01-01), Yamashita et al.

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