Polyaryl ether sulfone semipermeable membrane and process for pr

Details Polyaryl ether sulfone semipermeable membrane and process for pr Polyaryl ether sulfone semipermeable membrane and process for pr

1979-05-01

1981-08-25

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

210500M, 260 304R, 264 41, 264177R, 264178R, 264204, 264209, 428332, 428335, 428336, 428398, 428419, B32B 326, B32B 518, B01D 3914

Patent

active

042860156

ABSTRACT:
A semipermeable membrane made of a polyaryl ether sulfone comprised of recurring units represented by the general formula (I): ##STR1## wherein X, X', X" and X"' are non-dissociative substituents, and l, m, n and o are integers of from 0 to 4. The membrane, which is composed of a single continuous polymer phase, has pores of a diameter increasing progressively and continuously from the surface layers to the center portion thereof.
The membrane is prepared by the process wherein:

REFERENCES:
patent: 3567810 (1971-03-01), Baker
patent: 3615024 (1971-10-01), Michaels
patent: 3639306 (1972-02-01), Sternberg et al.
patent: 3691068 (1972-09-01), Cross
patent: 3709774 (1973-01-01), Kimura
patent: 3709841 (1973-01-01), Quentin
patent: 3762136 (1973-10-01), Kimura
patent: 4051300 (1977-09-01), Klein et al.

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