Aqueous dye inks with polymeric dispersant
View Patent ↗An ink composition is disclosed that includes: at least one color dye in an amount between and including 1% by weight and 7% by weight; at least one polymeric dispersant in an amount between and including 0.1% by weight and 1% by weight; at least one organic solvent in an amount between and including 18% by weight and 22% by weight; at least one surfactant in an amount between and including 0.5% by weight and 1.5% by weight; at least one buffer in an amount between and including 0.1% by weight and 0.5% by weight; at least one biocide in an amount between and including 0.05% by weight and 0.2% by weight; and the balance being deionized water.
1. An ink composition, comprising:
at least one color dye in an amount between and including 1% by weight and 7% by weight;
at least one polymeric dispersant in an amount between and including 0.1% by weight and 1% by weight;
at least one organic solvent in an amount between and including 18% by weight and 22% by weight;
at least one surfactant in an amount between and including 0.5% by weight and 1.5% by weight;
at least one buffer in an amount between and including 0.1% by weight and 0.5% by weight;
at least one biocide in an amount between and including 0.05% by weight and 0.2% by weight; and
the balance being deionized water.
2. The ink composition of claim 1 , wherein the polymeric dispersant comprises a hydrophobic portion.
3. The ink composition of claim 1 , wherein the hydrophobic segment of the polymeric dispersant comprises one or more phenolic groups.
4. The ink composition of claim 1 , wherein the hydrophilic segment of the polymeric dispersant comprises one or more acidic functional groups.
5. The ink composition of claim 1 , wherein the polymeric dispersant comprises a hydrophobic segment and a hydrophilic segment.
6. The ink composition of claim 1 , wherein the polymeric dispersant has a glass transition temperature between −30° C. and −40° C.
7. The ink composition of claim 1 , wherein the polymeric dispersant comprises an acrylic polymer.
8. The ink composition of claim 7 , wherein the acrylic polymer has moieties of methacrylic acid, poly(polypropylene glycol)-4 nonphenyl ether acrylate, and poly(ethylene glycol)2,4,6,-tris-(1-phenylethyl)phenyl ether methacrylate.
9. The ink composition of claim 8 , wherein the molar ratio of methacrylic acid, poly(polypropylene glycol)-4 nonphenyl ether acrylate, and poly(ethylene glycol)2,4,6,-tris-(1-phenylethyl)phenyl ether methacrylate is between 4:1:1 and 18:1:1.
10. The ink composition of claim 1 , wherein the ink composition has a detergent effect upon polymeric debris.
11. A printhead comprising:
a reservoir for holding a supply of ink, the ink comprising:
at least one color dye in an amount between and including 1% by weight and 7% by weight;
at least one polymeric dispersant in an amount between and including 0.1% by weight and 1% by weight;
at least one organic solvent in an amount between and including 18% by weight and 22% by weight;
at least one surfactant in an amount between and including 0.5% by weight and 1.5% by weight;
at least one buffer in an amount between and including 0.1% by weight and 0.5% by weight;
at least one biocide in an amount between and including 0.05% by weight and 0.2% by weight; and
the balance being deionized water.
12. The printhead of claim 11 , wherein the polymeric dispersant comprises a hydrophobic portion.
13. The printhead of claim 11 , wherein the hydrophobic segment of the polymeric dispersant comprises one or more phenolic groups.
14. The printhead of claim 11 , wherein the hydrophilic segment of the polymeric dispersant comprises one or more acidic functional groups.
15. The printhead of claim 11 , wherein the polymeric dispersant comprises a hydrophobic segment and a hydrophilic segment.
16. The printhead of claim 11 , wherein the polymeric dispersant has a glass transition temperature between −30° C. and −40° C.
17. The printhead of claim 11 , wherein the polymeric dispersant comprises an acrylic polymer.
18. The printhead of claim 17 , wherein the acrylic polymer has moieties of methacrylic acid, poly(polypropylene glycol)-4 nonphenyl ether acrylate, and poly(ethylene glycol)2,4,6,-tris-(1-phenylethyl)phenyl ether methacrylate.
19. The printhead of claim 17 , wherein the molar ratio of methacrylic acid, poly(polypropylene glycol)-4 nonphenyl ether acrylate, and poly(ethylene glycol)2,4,6,-tris-(1-phenylethyl)phenyl ether methacrylate is between 4:1:1 and 18:1:1.
20. The printhead of claim 17 , further comprising a nozzle in fluid communication with the reservoir, wherein the ink composition agglomerates polymeric debris disposed on a surface of the nozzle.