Inks for ink jet printing comprising a tris-azo dye
View Patent ↗Inks comprising a liquid medium and a tris-azo compound of Formula (1) or salt thereof: wherein the liquid medium comprises water and an organic solvent.
1. An ink comprising a liquid medium and a tris-azo compound of Formula (1) or salt thereof:
wherein the liquid medium comprises water and an organic solvent.
2. An ink according to claim 1 which comprises:
(a) from 0.01 to 30 parts of a compound of Formula (1) or salt thereof; and
(b) from 70 to 99.99 parts of a liquid medium comprising water and an organic solvent;
wherein all parts are by weight and the number of parts of (a)+(b)=100.
3. An ink according to claim 2 wherein the number of parts of component (a) is from 1 to 5 parts and the number of parts of component (b) is from 99 to 95 parts.
4. An ink according to claim 2 or 3 wherein component (a) is completely dissolved in component (b).
5. An ink according to claim 1 wherein the liquid medium comprises one or more anionic and/or nonionic surfactants.
6. An ink according to claim 1 wherein the liquid medium comprises one or more pH buffers.
7. An ink according to claim 1 wherein the liquid medium comprises one or more biocides.
8. An ink according to claim 1 wherein the liquid medium comprises one or more metal chelators.
9. An ink according to claim 1 having a pH of 3 to 5.
10. An ink according to claim 1 having a viscosity at 25° C. of less than 50 cP.
11. In the method of ink jet printing, the improvement wherein the ink is an ink according to claim 1 .
12. An ink jet cartridge containing an ink according to claim 1 .
13. A substrate ink jet printed with an ink according to claim 1 .