Hydrophilically modified fluorinated membrane (IV)

Patent metadata

Field	Value
Publication number	US-9643130-B2
Application number	US-201514675585-A
Country	US
Kind code	B2
Filing date	Mar 31, 2015
Priority date	Mar 31, 2015
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

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

Also disclosed are a method of preparing such copolymers, a method of modifying fluoropolymer membrane surfaces, and hydrophilic fluoropolymer porous membranes prepared from the copolymers.

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 3 , wherein the copolymer is of one of the following formulae:

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

6. 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 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 support.

7. The method of claim 6 , wherein the copolymer has chain end groups selected from aryl groups and alkoxy groups.

8. The method of claim 6 , wherein the copolymer is of one of the following formulae:

9. A hydrophilically modified porous fluoropolymer membrane produced by the method of claim 6 .

10. 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.

11. 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
• Stasiak Marcin

Classifications

• C08J7/0427 Primary

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

• B01D2323/02

  Hydrophilization · CPC title

• C08F132/08

  having condensed rings · CPC title

• C08J2327/18

  Homopolymers or copolymers of tetrafluoroethylene · CPC title

• B01D67/0095

  Drying · CPC title