Curable compositions and membranes

Patent metadata

Field	Value
Publication number	US-9944765-B2
Application number	US-201515303294-A
Country	US
Kind code	B2
Filing date	Apr 21, 2015
Priority date	Apr 28, 2014
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A method for preparing an ionically-charged membrane comprising the steps (1) applying a film of curable composition to a support; (2) curing the film of curable composition to give anionically-charged membrane; and (3) removing the ionically-charged membrane from the support; wherein the curable composition comprises a) 5 to 50 wt % of curable compound comprising one ethylenically unsaturated group and anionic group; b) 10 to 70 wt % of crosslinking agent comprising at least two ethylenically unsaturated groups and having a molecular weight of at least 500 dalton per ethylenically unsaturated group; and c) 5 to 60 wt % of inert solvent.

First claim

The invention claimed is:

1. A method for preparing an ionically-charged membrane comprising the steps:
(1) applying a film of curable composition to a support;
(2) curing the film of curable composition to give an ionically-charged membrane; and
(3) removing the ionically-charged membrane from the support;
wherein the curable composition comprises:
a) 5 to 50 wt % of curable compound comprising one ethylenically unsaturated group and an ionic group;
b) 10 to 70 wt % of crosslinking agent comprising at least two ethylenically unsaturated groups and having a molecular weight of at least 500 dalton per ethylenically unsaturated group; and
c) 5 to 60 wt % of inert solvent.

2. The method according to claim 1 wherein the crosslinking agent comprising at least two ethylenically unsaturated groups having a molecular weight of at least 700 dalton per ethylenically unsaturated group.

3. The method according to claim 1 wherein the crosslinking agent comprising at least two ethylenically unsaturated groups having a molecular weight below 10,000 dalton.

4. The method according to claim 1 wherein the said crosslinking agent has a solubility in water of less than 0.01 mol/l, when measured at 25° C.

5. The method according to claim 1 wherein the film is applied to the support by a method comprising curtain coating, blade coating, air-knife coating, knife-over-roll coating, slide coating, slot die coating, nip roll coating, forward roll coating, reverse roll coating, micro-roll coating, dip coating, foulard coating, kiss coating, rod bar coating or spray coating.

6. The method according to claim 1 wherein the curing is performed by a method comprising radical polymerisation using electromagnetic radiation.

7. The method according to claim 1 wherein the ionically-charged membrane is removed from the support by a method comprising peeling the ionically-charged membrane from the support.

8. The method according to claim 1 wherein the support is non-porous.

9. The method according to claim 1 wherein the composition further comprises d) an organic compound which can form a salt with component a), the organic compound being selected from the group consisting of tertiary amines having a molecular weight of less than 1000 dalton and organic acid anions having a molecular weight of less than 1000 dalton.

10. The method according to claim 1 wherein the molar ratio of component b) to a) is at least 0.05.

11. The method according to claim 9 wherein the molar ratio of d) to the total number of cationic and anionic groups in component a) is at least 0.8.

12. A curable composition comprising:
a) 5 to 50 wt % of curable compound comprising one ethylenically unsaturated group and an ionic group;
b) 10 to 70 wt % of crosslinking agent comprising at least two acrylic groups and having a molecular weight of at least 500 dalton per ethylenically unsaturated group; and
c) 5 to 60 wt % of inert solvent.

13. The curable composition according to claim 12 wherein the molar ratio of component b) to a) is at least 0.05.

14. The curable composition according to claim 12 comprising:
a) 8 to 40 wt % of curable compound comprising one ethylenically unsaturated group and a cationic or anionic group;
b) 15 to 60 wt % crosslinking agent comprising at least two acrylic groups and having a molecular weight of at least 500 dalton per acrylic group;
c) 8 to 40 wt % inert solvent;
d) an organic compound which can form a salt with component a), the organic compound being selected from the group consisting of tertiary amines having a molecular weight of less than 1000 dalton and organic acid anions having a molecular weight of less than 1000 dalton; and
e) 0.05 to 5 wt % radical initiator.

15. The curable composition according to claim 14 wherein the molar ratio of d) to the total number of cationic and anionic groups in component a) is at least 0.8.

16. The curable composition according to claim 12 wherein the molecular weight of component a) is less than 500 dalton.

17. The curable composition according to claim 12 further comprising d) an organic compound which can form a salt with component a), the organic compound being selected from the group consisting of tertiary amines having a molecular weight of less than 1000 dalton and organic acid anions having a molecular weight of less than 1000 dalton.

Assignees

• Fujifilm Mfg Europe Bv

Inventors

• Antheunis Harro

Classifications

• C02F1/4691

  Capacitive deionisation · CPC title

• C08J5/2231

  based on macromolecular compounds obtained by reactions involving unsaturated carbon-to-carbon bonds · CPC title

• B01D71/54

  Polyureas; Polyurethanes · CPC title

• B01D2325/16

  Membrane materials having positively charged functional groups · CPC title

• B01D2325/14

  Membrane materials having negatively charged functional groups · CPC title