Hydrophilically modified fluorinated membrane (II)

Patent metadata

Field	Value
Publication number	US-9724650-B2
Application number	US-201514675547-A
Country	US
Kind code	B2
Filing date	Mar 31, 2015
Priority date	Mar 31, 2015
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Disclosed are copolymers which are useful in hydrophilically modifying porous fluoropolymer supports. An example of the copolymers is:

Also disclosed are a method of preparing such copolymers, a method of modifying porous fluoropolymer surfaces, and hydrophilic fluoropolymer porous membranes prepared therefrom. Also disclosed is a method of filtering fluids by the use of the hydrophilic fluoropolymer porous 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;
x is 3 to about 10;
n and m, the number of repeat units B and A 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 3 , which is a block copolymer of the formula:

5. The composite hydrophilic porous membrane of claim 3 , which is a random copolymer of the formula:

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, 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;
x is 3 to about 10;
n and m, the number of repeat units B and A 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 has chain end groups selected from aryl groups and alkoxy groups.

8. The composite hydrophilic porous membrane of claim 6 , wherein the chelating or the ion-exchange functionality is selected from carboxyl alkylthio, sulfonyl alkylthio, and glyceryl thio groups, and combinations thereof.

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

10. 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;
x is 3 to about 10;
n and m, the number of repeat units B and A 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 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 membrane.

11. The method of claim 10 , wherein the copolymer is of the formula:

12. 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, and one or more chelating or ion-exchange functionalities attached to one or more repeat units A, 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;
x is 3 to about 10;
n and m, the number of repeat units B and A 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 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 membrane.

13. The method of claim 12 , wherein the copolymer is of the formula:

14. A hydrophilic porous membrane produced by the method of claim 10 .

15. 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.

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

17. 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

• Aamer Khaled Abdel-Hakim Helmy
• Qiu Jian
• Ait-Haddou Hassan

Classifications

• C08J7/0427 Primary

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

• B01D67/0006

  by chemical reactions (in-situ polymerisation, polycondensation, cross-linking or reaction for manufacturing composite membranes B01D69/125) · CPC title

• C08G2261/126

  block · CPC title

• B01D2323/30

  Cross-linking · CPC title

• C08G61/08

  of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring · CPC title