Curable compositions and membranes
AssigneeFujifilm Manufacturing Europe B.V.
InventorsBastiaan Van Berchum, Willem Johannes Van Baak, Jacko Hessing
Life of this patent
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Abstract
A membrane obtainable from curing a composition comprising: (i) a curable compound comprising at least two (meth)acrylic groups and a sulphonic acid group and having a molecular weight which satisfies the equation: MW<(300+300n) wherein: MW is the molecular weight of the said curable compound; and n has a value of 1, 2, 3 or 4 and is the number of sulphonic acid groups present in the said curable compound; and optionally (ii) a curable compound having one ethylenically unsaturated group; wherein the molar fraction of curable compounds comprising at least two (meth)acrylic groups, relative to the total number of moles of curable compounds present in the composition, is at least 0.25.
Claims13
An ion exchange membrane obtainable from curing a composition comprising:
- (i) a curable compound of the Formula (1) comprising at least two (meth)acrylic groups and a sulphonic acid group:
- wherein:
- R1 and R2 are each independently H or methyl;
- R3 and R4 are each independently H or alkyl, or R3 and R4 together with the N atoms to which they are attached and Y form an optionally substituted 6- or 7-membered ring;
- and
- Y is an optionally substituted and optionally interrupted alkylene or arylene group;
- provided that the compound of Formula (1) has 1, 2, 3 or 4 sulphonic acid groups;
- and having a molecular weight which satisfies the equation:
- MW<(300+300n)
- wherein:
- MW is the molecular weight of the said curable compound of the Formula (1);
- and
- n has a value of 1, 2, 3 or 4 and is the number of sulphonic acid groups present in the said curable compound of the Formula (1);
- and optionally (ii) a curable compound having one ethylenically unsaturated group;
- wherein the molar fraction of curable compounds comprising at least two (meth)acrylic groups, relative to the total number of moles of curable compounds present in the composition, is at least 0.5.
A process for preparing an ion exchange membrane comprising the following steps:
- a) applying a composition to a support;
- and
- b) curing the composition to form an ion exchange membrane;
- wherein the composition comprises:
- (i) a curable compound of the Formula (1) comprising at least two (meth)acrylic groups and a sulphonic acid group:
- wherein:
- R1 and R2 are each independently H or methyl;
- R3 and R4 are each independently H or alkyl, or R3 and R4 together with the N atoms to which they are attached and Y form an optionally substituted 6- or 7-membered ring;
- and
- Y is an optionally substituted and optionally interrupted alkylene or arylene group;
- provided that the compound of Formula (1) has 1, 2, 3 or 4 sulphonic acid groups;
- and having a molecular weight which satisfies the equation:
- MW<(300+300n)
- wherein:
- MW is the molecular weight of the said curable compound of the Formula (1);
- and
- n has a value of 1, 2, 3 or 4 and is the number of sulphonic acid groups present in the said curable compound of the Formula (1);
- and optionally (ii) a curable compound having one ethylenically unsaturated group;
- wherein the molar fraction of curable compounds comprising at least two (meth)acrylic groups, relative to the total number of moles of curable compounds present in the composition, is at least 0.5.
Dependencies are inferred from the claim text.