Curable compositions and membranes

Patent metadata

Field	Value
Publication number	US-9259685-B2
Application number	US-201514603524-A
Country	US
Kind code	B2
Filing date	Jan 23, 2015
Priority date	Dec 16, 2009
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

A curable composition comprising:
(i) 2.5 to 50 wt % crosslinker comprising at least two acrylamide groups; (ii) 12 to 65 wt % curable ionic compound comprising an ethylenically unsaturated group and a cationic group; (iii) 10 to 70 wt % solvent; and (iv) 0 to 10 wt % of free radical initiator; and (v) non-curable salt;

wherein the molar ratio of (i):(ii) is >0.10.

The compositions are useful for preparing ion exchange membranes.

First claim

The invention claimed is:

1. A membrane obtained from a process comprising the following steps:
applying a curable composition to a support; and
curing the composition to form a membrane;
wherein the curable composition comprises:
(i) 2.5 to 50 wt % crosslinker comprising at least two acrylamide groups;
(ii) 12 to 65 wt % curable ionic compound comprising an ethylenically unsaturated group and a cationic group;
(iii) 10 to 70 wt % solvent;
(iv) 0 to 10 wt % of free radical initiator; and
(v) non-curable salt comprising a cation and an anion, wherein the anion is not sulfate;
wherein the molar ratio of (i):(ii) is greater than and less than 5 0.10.

2. The membrane according to claim 1 wherein the total wt % of components (i) and (ii) relative to the total weight of the composition is 30 to 88 wt %.

3. The membrane according to claim 1 comprising 2 to 50 wt % of non-curable salt as component (v).

4. The membrane according to claim 1 wherein the molar ratio of (i):(ii) is at least 0.15 and which comprises 20 to 65 wt % of component (ii).

5. The membrane according to claim 1 wherein the solvent comprises water and a water-miscible organic solvent.

6. The membrane according to claim 1 which comprises 0.005 to 10 wt % photoinitiator as component (iv).

7. The membrane according to claim 1 which is free from ethylenically unsaturated compounds other than components (i) and (ii).

8. The membrane according to claim 1 wherein the ethylenically unsaturated group is an acrylamide or a methacrylamide group.

9. The membrane according to claim 1 wherein the composition comprises:
(i) 5 to 35 wt % crosslinker comprising at least two acrylamide groups;
(ii) 20 to 65 wt % curable ionic compound comprising an ethylenically unsaturated group and a cationic group; and
(iii) 16 to 45 wt % solvent;
(iv) 0.01 to 2 wt % of photoinitiator; and
(v) 3 to 40 wt % of non-curable salt comprising a cation and an anion, wherein the anion is not sulfate;
wherein the molar ratio of (i):(ii) is at least 0.15.

10. The membrane according to claim 1 wherein the molar ratio of (i):(ii) is at least 0.15 and less than 1.5.

11. The membrane according to claim 1 wherein the composition is cured by irradiation with an electron beam or UV light for a period of less than 30 seconds.

12. The membrane according to claim 1 wherein the curable composition is applied continuously to a moving support using a manufacturing unit comprising a curable composition application station, an irradiation source for curing the composition, and a membrane collecting station and wherein the support moves from the curable composition application station to the irradiation source and to the membrane collecting station.

13. The membrane according to claim 9 wherein the molar ratio of (i):(ii) is less than 1.5.

Assignees

• Fujifilm Mfg Europe Bv

Inventors

• Antheunis Harro
• Hessing Jacko
• Van Berchum Bastiaan

Classifications

• H01M8/227

  Dialytic cells or batteries; Reverse electrodialysis cells or batteries · CPC title

• C02F1/4695

  electrodeionisation · CPC title

• C02F1/4691

  Capacitive deionisation · CPC title

• B01D67/0006

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

• H01M8/1072

  by chemical reactions, e.g. in situ polymerisation or in situ crosslinking · CPC title