Azo dyes containing a barbituric acid moiety, ink-jet printing inks and processes
View Patent ↗A process for coloration of a substrate comprising applying thereto means of an ink jet printer a composition comprising a medium and a compound of Formula (1): wherein: A is optionally substituted aryl; B is optionally substituted arylene; and R 1 and R 2 are each independently H or optionally substituted alkyl. Also claimed are novel compounds, compositions and ink-jet cartridges for use an ink-jet printer and substrate printed with an ink-jet printer.
1. An ink-jet printing process process for coloration of a substrate comprising applying thereto by means of an ink jet printer a composition comprising a medium and a compound of Formula (1):
wherein:
A is optionally substituted aryl;
B is optionally substituted arylene; and
R 1 and R 2 are each independently H or optionally substituted alkyl.
2. An ink-jet printing process according to claim 1 wherein in the compound of Formula (1) A is optionally substituted phenyl and B is optionally substituted phenylene.
3. An ink-jet printing process according to either claim 1 or claim 2 wherein in the compound of Formula (1) R 1 and R 2 are each independently H or C 1-4 -alkyl.
4. An ink-jet printing process according to claim 1 wherein the medium is a liquid medium.
5. A substrate printed by a process according to claim 1 .
6. A composition comprising a compound of Formula (1) as defined in claim 1 and a medium which comprises a mixture of water and organic solvent or organic solvent free from water wherein said composition has a total concentration of divalent and trivalent metal ions of below 1000 parts per million by weight relative to the total weight of the composition.
7. A composition according to claim 6 which has been filtered through a filter having a mean pore size below 10 μm.
8. A composition according to either claim 6 or claim 7 with a total concentration of divalent and trivalent metal ions of below 100 ppm.
9. A composition according to claim 6 which is an ink-jet printing ink or a liquid dye concentrate.
10. A compound of Formula (2):
wherein:
X is a water-dispersing substituent;
p is 1 to 5; and
q is 0 to 4.
11. A compound according to claim 10 wherein each X independently is sulpho or carboxy.
12. An ink jet printer cartridge comprising a chamber and a composition wherein the composition is in the chamber and the composition is as described in claim 6 .
13. A substrate according to claim 5 wherein the substrate is selected from the group consisting of paper, an overhead projector slide, a textile material, a plastic, glass and metal.