公开(公告)号：US11130099B2

公开(公告)日：2021-09-28

申请号：US16624588

申请日：2018-06-25

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Daniel Malek ,  Walter Stripp ,  Martin Czernik ,  Ramona Osterloh ,  Frank Schneider

IPC: B01D71/56 ,  B01D61/02 ,  B01D61/14 ,  B01D67/00 ,  B01D69/02 ,  B01D69/06

Abstract: The present disclosure provides a flat-sheet polyamide membrane comprising a first major surface and a second major surface and a separation layer and a porous substructure in the cross section of the membrane between the first major and the second major surface, wherein the average pore size diameter in the separation layer is smaller than the average pore size diameters on the first and second major surfaces, wherein the average pore size diameter on the first major surface is larger than the average pore size diameter on the second major surface, wherein the separation layer is closer to the second major surface than to the first major surface. The present disclosure further provides a method for producing such membranes and a use of the membranes for nanofiltration or ultrafiltration purposes.

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.

公开(公告)号：US20220203308A1

公开(公告)日：2022-06-30

申请号：US17610683

申请日：2020-06-23

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Frank Schneider ,  Stefan Weuster ,  Daniel P. Malek ,  Mathias Stroschke

IPC: B01D71/82 ,  B01D69/08 ,  B01D71/68 ,  B01D61/14

Abstract: The present disclosure provides a process for producing a modified microporous membrane, comprising (i) Providing a first solution comprising at least one first polymer and at least one epoxy functional compound; (ii) Providing a second solution comprising at least one diamine compound; (iii) Bringing the first solution and the second solution into contact, thereby obtaining a modified microporous membrane comprising at least one first polymer and the crosslinked reaction product of the at least one epoxy functional compound and the at least one diamine compound; wherein the modified microporous membrane is a hollow-fiber membrane; and wherein the first solution is a dope solution, the second solution is a bore solution, and bringing the first and second solutions into contact takes place in a spinneret.