US 12,515,175 B2 · Composite membrane

Abstract

A composite membrane comprising: a) a first layer comprising a first porous support and a first ionic polymer present in the pores of the first porous support; b) a second layer comprising a second porous support and a second ionic polymer present in the pores of the second porous support; c) a third layer comprising a third porous support, a third ionic polymer and a fourth ionic polymer, wherein the third ionic polymer is present in the pores of the third porous support; wherein: (i) one of the first ionic polymer and the second ionic polymer is a cationic polymer and the other is an anionic polymer; (ii) the third layer c) is interposed between the first layer a) and the second layer b); (iii) the third ionic polymer comprises a network of pores and the fourth ionic polymer is present within the pores of the third ionic polymer; and (iv) one of the third ionic polymer and the fourth ionic polymer is a cationic polymer and the other is an anionic polymer.

Claims23

Dependent claims

A composite membrane comprising:

a) a first layer comprising a first porous support and a first ionic polymer present in the pores of the first porous support;
b) a second layer comprising a second porous support and a second ionic polymer present in the pores of the second porous support;
c) a third layer comprising a third porous support, a third ionic polymer and a fourth ionic polymer, wherein the third ionic polymer is present in the pores of the third porous support;
wherein:
(i) one of the first ionic polymer and the second ionic polymer is a cationic polymer and the other is an anionic polymer;
(ii) the third layer c) is interposed between the first layer a) and the second layer b);
(iii) the third ionic polymer comprises a network of pores and the fourth ionic polymer is present within the pores of the third ionic polymer;
and
(iv) one of the third ionic polymer and the fourth ionic polymer is a cationic polymer and the other is an anionic polymer.

6 more elements

A process for preparing a composite membrane comprising the following steps:

I. providing a first porous support, a second porous support and a third porous support;
II. providing a first curable composition comprising a curable ionic compound, a second curable composition comprising a curable ionic compound of charge opposite to the curable compound present in the first curable composition, a third curable composition comprising a curable ionic compound and a fourth curable composition comprising a curable ionic compound of charge opposite to the curable compound present in the third curable composition;
III. impregnating the third porous support with the third curable composition;
IV. curing the third curable composition present in the third porous support to form a base layer comprising the third porous support and the third, ionic polymer comprising a network of pores;
V. impregnating the network of pores of the third ionic polymer with the fourth curable composition;
VI. contacting the first curable composition with a first side of the base layer;
VII. contacting the second curable composition with a second side of the base layer;
and
VIII. curing the first curable composition, the second curable composition and the fourth curable composition in any order or simultaneously thereby forming the first ionic polymer, the second ionic polymer and the fourth ionic polymer respectively;
wherein:
(a) when curing the first curable composition the first curable composition comprises the first porous support;
(b) when curing the second curable composition the second curable composition comprises the second porous support;
(c) one of the first curable composition and the second curable composition comprises a curable compound having an ethylenically unsaturated group and an anionic group and the other comprises a curable compound having an ethylenically unsaturated group and a cationic group;
and
(d) one of the third curable composition and the fourth curable composition comprises a curable compound having an ethylenically unsaturated group and an anionic group and the other comprises a curable compound having an ethylenically unsaturated group and a cationic group.

12 more elements

Dependencies are inferred from the claim text.

Composite membrane

Life of this patent

Composite membrane

Life of this patent

Abstract

Claims23