Process for making membranes

Patent metadata

Field	Value
Publication number	US-10441925-B2
Application number	US-201515502896-A
Country	US
Kind code	B2
Filing date	Jul 30, 2015
Priority date	Aug 12, 2014
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

Process for making a membrane M comprising the following steps: a) preparing a copolymer C, wherein said copolymer C comprises blocks of at least one polyarylene ether A and blocks of polyalkylene oxide PAO, wherein the content of polyethyleneoxide in copolymer C is 30 to 90% by weight and wherein copolymer C is prepared in a solvent L to yield solution S; b) providing a dope solution D comprising at least one polymer P; c) mixing solution S and dope solution D; d) preparing a membrane by bringing the mixture of solution S and dope solution D into contact with at least one coagulating agent.

First claim

The invention claimed is:

1. A process for making a membrane M, the process comprising:
a) preparing a copolymer C, wherein said copolymer C comprises blocks of at least one polyarylene ether A and blocks of polyalkylene oxide PAO, wherein the content of polyalkylene oxide PAO in copolymer C is 30 to 90% by weight and wherein copolymer C is prepared in a solvent L to yield solution S;
b) providing a dope solution D comprising at least one polymer P;
c) mixing the solution S obtained in the preparation of copolymer C and the dope solution D to obtain a mixture; and
d) preparing a membrane by bringing the mixture of the solution S and the dope solution D into contact with at least one coagulating agent.

2. The process according to claim 1 , wherein said block of at least one polyarylene ether A is selected from the group consisting of a polyethersulfone, a polysulfone, a polyphenylenesulfone, and copolymers or mixtures thereof.

3. The process according to claim 1 , wherein said polymer P is selected from the group consisting of a polyethersulfone, a polysulfone and a polyphenylenesulfone.

4. The process of claim 1 , wherein said polyalkylene oxide is polyethylene oxide.

5. The process of claim 1 , wherein said solvent L is NMP.

6. The process of claim 1 , wherein said at least one coagulating agent comprises water.

7. The process of claim 1 , wherein the membrane M contains the copolymer C and the polymer P in a mass ratio of 1:99 to 1:3.

8. The process of claim 1 , wherein said blocks of polyalkylene oxide PAO have an average molecular mass Mn of 150 g/mol to 20000 g/mol.

9. The process of claim 1 , wherein said dope solution D further comprises a further additive selected from the group consisting of a polyvinylpyrrolidone, a polyethylene oxide, a phenoxy resin, and mixtures thereof.

10. The process of claim 1 , wherein said copolymer C is prepared by reacting aromatic bishalogeno compounds and aromatic biphenols or salts thereof in the presence of at least one suitable base and in the presence of at least one polyalkylene oxide PAO.

11. A membrane obtained by the process of claim 1 .

12. A filtration system, comprising the membrane of claim 11 .

13. A water treatment method, comprising:
passing an aqueous medium through the membrane of claim 11 .

14. The method of claim 13 , wherein the aqueous medium is in the form of:
an industrial or municipal waste,
a sea or brackish water,
a dialysis sample,
a plasmolysis sample, or
a food to be processed.

15. The process of claim 1 , wherein
said block of at least one polyarylene ether A is selected from the group consisting of a polyethersulfone, a polysulfone, a polyphenylenesulfone, and copolymers or mixtures thereof,
said polymer P is selected from the group consisting of a polyethersulfone, a polysulfone and a polyphenylenesulfone,
said polyalkylene oxide is polyethylene oxide, and
said solvent L is NMP.

Assignees

• Basf Se

Inventors

• Weber Martin
• Janssen Nicole
• Voss Hartwig
• Malisz Jacek
• Heijnen Martin
• Menozzi Edoardo

Classifications

• A23L2/74

  using membranes, e.g. osmosis, ultrafiltration · CPC title

• C08G2340/00

  Filter material · CPC title

• C02F2103/08

  Seawater, e.g. for desalination · CPC title

• B01D71/80 Primary

  Block polymers · CPC title

• B01D2325/22

  Thermal or heat-resistance properties · CPC title