Water-Based Ink For Ink-Jet Recording

Abstract

A water-based ink for ink-jet recording may include a benzotriazole type compound for preventing corrosion of a metal in an ink ejection portion of an ink-jet head, and a coloring agent having a divalent metal in a structure thereof, and a polymer containing a polymerization unit having at least two carboxyl groups in an ethylene chain unit. The generation of a precipitate by reaction between the divalent metal and the benzotriazole type compound may be suppressed without using a sequestering agent. The ink may have an excellent corrosion inhibiting effect and an ink ejection stability effect.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a schematic perspective view of a configuration of an ink-jet recording apparatus; and

FIG. 2 shows a schematic view of an anodic polarization measurement.

Claims

1. A water-based ink for ink-jet recording comprising: a coloring agent comprising a divalent metal in a structure thereof;a benzotriazole type compound; anda polymer comprising a polymerization unit having at least two carboxyl groups in an ethylene chain unit.

2. The water-based ink according to claim 1, wherein the coloring agent is a dye.

3. The water-based ink according to claim 1, wherein the coloring agent is a copper complex dye.

4. The water-based ink according to claim 1, wherein the coloring agent is a copper phthalocyanine type dye.

5. The water-based ink according to claim 1, wherein the polymer is sodium polyitaconate.

6. The water-based ink according to claim 1, wherein the polymer is present in an amount from about 0.05 wt % to about 5 wt %, based on the total weight of the water-based ink.

7. The water-based ink according to claim 1, further comprising an organic solvent selected from the group consisting of lower alcohols, amides, ketones, keto alcohols, ethers, polyalkylene glycols, alkylene glycols, and combinations thereof.

8. The water-based ink according to claim 7, wherein the organic solvent is selected from the group consisting of methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, dimethylformamide, dimethylacetamide, acetone, diacetone alcohol, tetrahydrofuran, dioxane, polyethylene glycol, polypropylene glycol, ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, thiodiglycol, hexylene glycol, and combinations thereof.

9. The water-based ink according to claim 1, further comprising an organic solvent is selected from the group consisting of ethylene glycol based ethers, propylene glycol based ethers, and combinations thereof.

10. The water-based ink according to claim 1, further comprising an organic solvent is selected from the group consisting of glycerin, 2-pyrrolidone, N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, and combinations thereof.

11. An ink-jet recording apparatus comprising: an ink cartridge filled with a water-based ink for ink-jet recording comprising a coloring agent having a divalent metal in a structure thereof, a benzotriazole type compound, and a polymer comprising a polymerization unit having at least two carboxyl groups in an ethylene chain unit; andan ink-jet head comprising an ink ejection portion which communicates with the ink cartridge, wherein the ink ejection portion comprises a metal member comprising nickel or a nickel-containing alloy.

12. The ink-jet recording apparatus according to claim 11, wherein the coloring agent is a dye.

13. The ink-jet recording apparatus according to claim 11, wherein the coloring agent is a copper complex dye.

14. The ink-jet recording apparatus according to claim 11, wherein the polymer is sodium polyitaconate.

15. The ink-jet recording apparatus according to claim 11, wherein the polymer is present in an amount from about 0.05 wt % to about 5 wt %, based on the total weight of the water-based ink.

16. A method of suppressing generation of a precipitate in a water-based ink for ink-jet recording, wherein the water-based ink comprises a coloring agent having a divalent metal in a structure and thereof and a benzotriazole type compound, the method comprising adding to the ink a polymer having a polymerization unit comprising at least two carboxyl groups in an ethylene chain unit.

17. The method according to claim 16, wherein the coloring agent is a dye.

18. The method according to claim 16, wherein the coloring agent is a copper complex dye.

19. The method according to claim 16, wherein the polymer is sodium polyitaconate.

20. The method according to claim 16, wherein the polymer is added to the water-based ink in an amount from about 0.05 wt % to about 5 wt %, based on the total weight of the water-based ink.