公开(公告)号：US20210229043A1

公开(公告)日：2021-07-29

申请号：US17053848

申请日：2019-05-29

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Daniel Malek ,  Stefan Weuster ,  Frank Schneider ,  Alexey Kurov ,  Andreas Holt

IPC: B01D69/02 ,  B01D69/08 ,  B01D71/68 ,  B01D61/14

Abstract: The present disclosure provides a hydrophilic, integrally asymmetric, semi-permeable hollow-fiber membrane made from a hydrophobic aromatic sulfone polymer and at least one hydrophilic polymer, the membrane comprising an inner surface facing towards its lumen, an outer surface facing outwards and an intermediate wall having a wall thickness and comprising an open-pore separating layer and an supporting layer having an asymmetric, sponge-like structure without finger pores, wherein adjoining to the wall of the inner surface the hollow-fiber membrane comprises an essentially isotropic zone; after which the pore size abruptly start increasing up to a maximum, after which the pore size decrease again, then adjoining an essentially isotropic supporting layer which then is adjoined by the outer surface, wherein the separating layer has a cut-off of greater than 300 000 Daltons. The present disclosure further provides a method for producing such membranes and a use of the membranes for microfiltration purposes.