Anion exchange membranes and process for making

Patent metadata

Field	Value
Publication number	US-9768502-B2
Application number	US-201615225352-A
Country	US
Kind code	B2
Filing date	Aug 1, 2016
Priority date	Oct 15, 2010
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

Embodiments of the present invention provide for anion exchange membranes and processes for their manufacture. The anion exchange membranes described herein are made the polymerization product of at least one functional monomer comprising a tertiary amine which is reacted with a quaternizing agent in the polymerization process.

First claim

The invention claimed is:

1. A process of producing an ion exchange membrane, comprising:
saturating porous regions of a porous substrate having a porosity of at least about 45% with a first solution comprising vinylbenzyl chloride, benzyl chloride, and a tertiary amine monomer selected from the group consisting of vinylimidazole and vinylcarbazole, the porous substrate having a thickness of greater than about 20 microns and less than about 55 microns; and
heating the saturated porous substrate to forma crosslinked ion exchange polymer in the porous regions; and
conditioning the porous substrate having the crosslinked ion exchange polymer in a second solution comprising sodium chloride for at least thirty minutes.

2. The process of claim 1 , wherein the first solution further comprises at least one polymerization initiator selected from the group consisting of organic peroxides, 2,2′-azobis[2,(2-imidazolin-2-yl)-propane] dihydrochloride, a,a′-azoisobutyronitrile, 2,2′-azobis(2-methylpropioaminidine) dihydrochloride, 2,2′-azobis[2,(2-imidazolin-2-yl)-propane], and dimethyl 2,2′-azobis(2-methylpropionate).

3. The process of claim 2 , wherein the first solution further comprises at least one polymerization inhibitor selected from the group consisting of 4-methoxyphenol and 4-tert-butyl catechol.

4. The process of claim 1 , wherein the porous substrate is comprised of polypropylene, high molecular weight polyethylene, ultrahigh molecular weight polyethylene or polyvinylidene fluoride.

5. The process of claim 1 , wherein the first solution further comprises a solvent selected from the group consisting of butanol, propanol, dipropylene glycol, dimethylacetamide, and N methylpyrrolidone.

6. The process of claim 1 , wherein heating the porous substrate having porous regions saturated with the first solution comprises heating the porous substrate in the absence of oxygen.

Assignees

• Evoqua Water Tech Llc

Inventors

• Lin Juchui Ray

Classifications

• C08F212/18 Primary

  Chlorine · CPC title

• C08F12/18

  Chlorine · CPC title

• H03K5/01

  Shaping pulses (discrimination against noise or interference H03K5/125) · CPC title

• H01Q3/38

  the phase-shifters being digital · CPC title

• C08F226/06

  by a heterocyclic ring containing nitrogen · CPC title