Disazo dyes and ink jet inks containing them
View Patent ↗A compound of Formula (1): wherein: A 1 and A 2 are each independently optionally substituted phenyl or naphthyl; each Q independently is optionally substituted phenylene; each R 1 independently is H or optionally substituted alkyl; R 2 is H or optionally substituted alkyl; and R 3 is alkyl carrying a sulpho group; provided that the compound of Formula (1) carries at least one carboxylic acid group; and provided the compound of Formula (1) is not of Formula (2): wherein: m is 1 or 2; n is 1 or 2; and x is 2 to 4. Also claimed are compositions and inks.
1. A compound of Formula (1):
wherein:
A 1 and A 2 are each independently optionally substituted phenyl or naphthyl;
each Q independently is optionally substituted phenylene;
each R 1 independently is H or optionally substituted alkyl;
R 2 is H or optionally substituted alkyl; and
R 3 is alkyl carrying a sulpho group;
provided that the compound of Formula (1) carries at least one carboxylic acid group; and
provided the compound of Formula (1) is not a compound of Formula (2) or a salt thereof:
wherein:
m is 1 or 2;
n is 1 or 2; and
x is 2 to 4.
2. A compound according to claim 1 wherein A 1 and A 2 are different to each other.
3. A compound according to claim 2 wherein one of A 1 and A 2 carries at least one carboxylic acid group and the other is free from carboxylic acid groups.
4. A compound according to claim 1 wherein A 1 and A 2 are the same as each other.
5. A composition comprising a compound of Formula (1) as defined in claim 1 and a liquid medium.
6. A process for printing an image on a substrate comprising applying thereto a composition according to claim 5 .
7. An ink jet printer cartridge, optionally refillable, comprising one or more chambers and a composition, wherein the composition is present in at least one of the chambers and the composition is as defined in claim 5 .
8. A paper, an overhead projector slide or a textile material printed with a composition according to claim 5 .