Hydrophilically modified fluorinated membrane (III)

Patent metadata

Field	Value
Publication number	US-9649603-B2
Application number	US-201514675562-A
Country	US
Kind code	B2
Filing date	Mar 31, 2015
Priority date	Mar 31, 2015
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

Disclosed are copolymers suitable for hydrophilically modifying the surface of fluoropolymer membranes. An example of the copolymers is:

Also disclosed are a method of preparing the copolymers, a method of hydrophilically modifying porous fluoropolymer supports, hydrophilic porous fluoropolymer membranes prepared from the copolymers, and a method of filtering fluids by the use of the hydrophilic porous fluoropolymer membranes.

First claim

The invention claimed is:

1. A composite hydrophilic porous membrane comprising a porous fluoropolymer support and a coating comprising a copolymer, wherein the copolymer comprises repeat units A and B, wherein A is of the formula:

and B is of the formula

wherein:
the copolymer is a block copolymer or a random copolymer;
m and n, the number of repeat units A and B present in the copolymer, range from 1 to about 1000, provided the sum of n and m is equal to or greater than 10;
wherein the copolymer is optionally crosslinked.

2. The composite hydrophilic porous membrane of claim 1 , wherein the copolymer has chain end groups selected from aryl groups and alkoxy groups.

3. The composite hydrophilic porous membrane of claim 1 , wherein the copolymer is of one of the following formulae:

4. The composite hydrophilic porous membrane of claim 1 , wherein the copolymer further comprises one or more repeat units C of the formula:

5. The composite hydrophilic porous membrane of claim 4 , wherein the copolymer is:

wherein k=1 to 1000.

6. A composite hydrophilic porous membrane comprising a porous fluoropolymer support and a coating comprising a copolymer, wherein the copolymer comprises repeat units A and B and one or more chelating or ion-exchange functionalities attached to one or more repeat units A and B, wherein A is of the formula:

and B is of the formula:

wherein:
* is the point of attachment of the chelating or ion-exchange functionality;
the copolymer is a block copolymer or a random copolymer;
m and n, the number of repeat units A and B present in the copolymer, range from 1 to about 1000, provided the sum of n and m is equal to or greater than 10;
wherein the copolymer is optionally crosslinked.

7. The composite hydrophilic porous membrane of claim 6 , wherein the copolymer is:

8. A method of hydrophilically modifying a porous fluoropolymer support comprising:
(i) providing a porous fluoropolymer support;
(ii) coating the porous fluoropolymer support with a solution comprising a solvent and a copolymer, wherein the copolymer comprises repeat units A and B, wherein A is of the formula:

and B is of the formula

wherein:
the copolymer is a block copolymer or a random copolymer;
m and n, the number of repeat units A and B present in the copolymer, range from 1 to about 1000, provided the sum of n and m is equal to or greater than 10;
(iii) drying the coated fluoropolymer support from (ii) to remove at least some of the solvent from the solution comprising said copolymer; and optionally
(iv) crosslinking said copolymer present in the coated porous fluoropolymer support.

9. The method of claim 8 , wherein the solution further comprises, or the porous fluoropolymer support coated with the copolymer is further coated with, a polymer of the formula C:

10. The method of claim 8 , wherein the copolymer has chain end groups selected from aryl groups and alkoxy groups.

11. The method of claim 8 , wherein the copolymer is:

12. A hydrophilically modified porous fluoropolymer membrane produced by the method of claim 8 .

13. The composite hydrophilic porous membrane of claim 1 , wherein the porous fluoropolymer support is selected from PTFE, PVDF, PVF (polyvinyl fluoride), PCTFE (polychlorotrifluoroethylene), FEP (fluorinated ethylene-propylene), ETFE (polyethylenetetrafluoroethylene), ECTFE (poly ethylenechlorotrifluoroethylene), PFPE (perfluoropolyether), PFSA (perfluorosulfonic acid), and perfluoropolyoxetane.

14. A method of filtering a fluid, the method comprising passing the fluid through the composite hydrophilic porous membrane of claim 1 .

15. The composite hydrophilic porous membrane of claim 1 , which is configured in a planar, flat sheet, pleated, tubular, spiral, or hollow fiber configuration.

Assignees

• Pall Corp

Inventors

• Ait-Haddou Hassan
• Aamer Khaled Abdel-Hakim Helmy
• Qiu Jian
• Onyemauwa Frank Okezie
• Stasiak Marcin

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• B01D67/0088

  Physical treatment with compounds, e.g. swelling, coating or impregnation · CPC title

• B01D2325/42

  Ion-exchange membranes · CPC title

• C08J2445/00

  Characterised by the use of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Derivatives of such polymers · CPC title

• C08F236/045

  conjugated hydrocarbons other than butadiene or isoprene · CPC title