Monoazo compounds and inks containing them
View Patent ↗A compound of Formula (1) and salts thereof: wherein: R 1 and R 3 are each independently H or optionally substituted alkyl; R 2 is either alkyl carrying a water-solubilising group selected from the group consisting of OH, —(OCH 2 CH 2 ) q —, where q is from 1 to 10, carboxylic acid and sulfonic acid groups and salts thereof; or a C1-12-alkyl group free from water-solubilising groups; Y is OH, CO 2 H, SO 3 H or PO 3 H 2 ; and n and m each independently have a value of 0 or 1; provided that the compound of Formula (1) is free from fibre reactive groups. Also an ink-jet printing ink, an ink-jet printing process, a printed material and an ink jet printer cartridge.
1. A compound of Formula (1) and salts thereof:
wherein:
R 1 and R 3 are each independently H or optionally substituted alkyl;
R 2 is either alkyl carrying a water-solubilising group selected from the group consisting of OH, —(OCH 2 CH 2 ) q —, where q is from 1 to 10, carboxylic acid and sulfonic acid groups and salts thereof; or a C 1-12 -alkyl group free from water-solubilising groups;
Y is OH, CO 2 H, SO 3 H or PO 3 H 2 ; and
n and m each independently have a value of 0 or 1;
provided that the compound of Formula (1) is free from fibre reactive groups.
2. A compound according to claim 1 wherein the compound of Formula (1) is in the form of a lithium, sodium, potassium or quaternary ammonium salt, or a mixture thereof.
3. A compound according to claim 1 wherein R 1 and/or R 2 comprise a water-solubilising group.
4. A compound according to claim 3 wherein the water-solubilising group is ionic.
5. A compound according to claim 1 wherein R 1 and/or R 2 is a C 1-12 -alkyl group free from water-solubilising groups.
6. An ink comprising a compound according to claim 1 and a liquid medium.
7. An ink comprising:
(a) from 0.01 to 30 parts of a compound according to claim 1 ; and
(b) from 70 to 99.99 parts of a medium comprising component (i), (ii) or (iii):
(i) a mixture of water and an organic solvent; or
(ii) an organic solvent free from water; or
(iii) a low melting point solid;
wherein all parts are by weight and the number of parts (a)+(b)=100.
8. An ink jet printing ink according to either claim 6 or 7 .
9. A process for printing an image on a substrate comprising applying an ink according to claim 8 to the substrate by means of an ink jet printer.
10. A paper, an overhead projector slide or a textile material printed with an ink according to claim 8 .
11. An ink jet printer cartridge containing an ink according to claim 8 .
12. A paper, an overhead projector slide or a textile material printed by a process according to claim 9 .
13. A compound according to claim 3 wherein R 2 is alkyl carrying a water-solubilising group selected from the group consisting of OH, —(OCH 2 CH 2 ) q —, where q is from 1 to 10, carboxylic acid and sulfonic acid groups and salts thereof.