Curable compositions and membranes

Patent metadata

Field	Value
Publication number	US-9238221-B2
Application number	US-201514603477-A
Country	US
Kind code	B2
Filing date	Jan 23, 2015
Priority date	Dec 16, 2009
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

A curable composition comprising:
(i) 2.5 to 50 wt % crosslinker comprising at least two acrylamide groups; (ii) 20 to 65 wt % curable ionic compound comprising an ethylenically unsaturated group and an anionic group; (iii) 15 to 45 wt % solvent; and (iv) 0 to 10 wt % of free radical initiator; wherein the molar ratio of (i):(ii) is 0.1 to 1.5.

The compositions are useful for preparing ion exchange membranes.

First claim

The invention claimed is:

1. A membrane obtained by 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) 7.47 to 43.33 wt % crosslinker comprising at least two acrylamide groups;
(ii) 20 to 65 wt % curable ionic compound comprising an ethylenically unsaturated group and an anionic group;
(iii) 15 to 45 wt % solvent; and
(iv) 0 to 10 wt % of free radical initiator;

wherein the molar ratio of (i):(ii) is from 0.1 to 1.5.

2. The membrane according to claim 1 wherein (a) the molar ratio of (i):(ii) is from 0.1 to 1.0; (b) the ethylenically unsaturated group is an acrylamide group or a methacrylamide group; and (c) the composition contains 20 to 40 wt % solvent.

3. The membrane according to claim 1 wherein (a) the composition comprises 20 to 40 wt % solvent; (b) the total wt % of components (i) and (ii) relative to the total weight of the composition is 30 to 85 wt %; (c) the solvent comprises at least 40 wt % water; and (d) the molar ratio of (i):(ii) is from 0.13 to 0.7.

4. 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 85 wt %.

5. The membrane according to claim 1 wherein the solvent comprises at least 40 wt % water.

6. The membrane according to claim 1 wherein the composition comprises 0.005 to 10 wt % photoinitiator.

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

8. The membrane according to claim 1 wherein the curable composition comprises:
(i) 8 to 16 wt % crosslinker comprising at least two acrylamide groups;
(ii) 40 to 60 wt % curable ionic compound comprising an ethylenically unsaturated group and an anionic group;
(iii) 22 to 40 wt % solvent; and
(iv) 0.01 to 2 wt % of photoinitiator;

wherein the molar ratio of (i):(ii) is from 0.1 to 1.0.

9. The membrane according to claim 1 wherein the curing is performed using electron beam or UV radiation.

10. 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.

11. 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.

12. The membrane according to claim 8 wherein the curing is performed using electron beam or UV radiation.

13. The membrane according to claim 8 wherein the composition is cured by irradiation with an electron beam or UV light for a period of less than 30 seconds.

Assignees

• Fujifilm Mfg Europe Bv

Inventors

• Van Berchum Bastiaan
• Hessing Jacko
• Antheunis Harro

Classifications

• C02F1/4691

  Capacitive deionisation · CPC title

• C08F220/58

  containing oxygen in addition to the carbonamido oxygen {, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine} · CPC title

• C02F1/42

  by ion-exchange (ion-exchange in general B01J) · CPC title

• H01M8/227

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

• C02F2201/46115

  Electrolytic cell with membranes or diaphragms · CPC title