Use of black dyes in color inks to enhance print quality

Patent metadata

Field	Value
Publication number	US-11279839-B2
Application number	US-201815883132-A
Country	US
Kind code	B2
Filing date	Jan 30, 2018
Priority date	Jan 30, 2018
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A magenta dye-based ink composition and a method for improving the print qualities of a magenta dye-based ink composition. The magenta dye-based ink composition includes one or more red dye(s) and a minor but effective amount of black dye. A weight ratio of red dye(s) to black dye in the ink composition ranges from about 20:1 to about 100:1.

First claim

What is claimed is:

1. A magenta dye-based ink composition comprising a combination of dyes consisting of (a) one or more red dye(s) and (b) a minor but effective amount of black dye, wherein a weight ratio of red dye(s) to black dye in the combination of dyes ranges from about 20:1 to about 100:1, and wherein the black dye is selected from the group consisting of lightfast black dyes that provide the magenta dye-based ink composition with a ΔE of less than 5.

2. The magenta dye-based ink composition of claim 1 , wherein the amount of black dye in the ink composition ranges from about 0.05 to about 0.25 percent by weight based on a total weight of the ink composition.

3. The magenta dye-based ink composition of claim 1 , wherein the black dye comprises a lightfast black dye having a bluish tint.

4. The magenta dye-based ink composition of claim 1 , wherein the black dye comprises a lightfast azo direct dye black.

5. The magenta dye-based ink composition of claim 1 , wherein the red dye is selected from the group consisting of acid red dyes, anthrapyridone disulfonic acid dyes, pyridine azo dyes, and mixtures thereof.

6. The magenta dye-based ink composition of claim 1 , wherein the combination of dyes consists of the black dye and a mixture of red dyes.

7. The magenta dye-based ink composition of claim 1 , further comprising a humectant, a solvent, a penetrant, a surfactant, and water.

8. An ink set comprising the magenta dye-based ink composition of claim 1 , a cyan ink composition, a yellow ink composition.

9. A method for improving the print qualities of a magenta dye-based ink composition comprising:
mixing a minor amount of black dye, selected from the group consisting of lightfast black dyes with one or more red dyes in a weight ratio of red dye to black dye of from about 20:1 to about 100:1 to provide a combination of dyes consisting of only the one or more red dyes and the black dye, and
adding the combination of dyes to ink components other than dyes to provide the magenta dye-based ink composition, wherein the magenta dye-based ink composition has a ΔE of less than 5.

10. The method of claim 9 , wherein the amount of black dye in the combination of dyes ranges from about 0.05 to about 0.25 percent by weight based on a total weight of the ink composition.

11. The method of claim 9 , wherein the black dye comprises a lightfast black dye having a bluish tint.

12. The method of claim 9 , wherein the black dye comprises a lightfast azo direct dye black.

13. The method of claim 9 , wherein the red dye is selected from the group consisting of acid red dyes, anthrapyridone disulfonic acid dyes, pyridine azo dyes, and mixtures thereof.

14. The method of claim 9 , further comprising mixing a humectant, a solvent, a penetrant, a surfactant, and water with the combination of dyes to provide the magenta dye-based ink composition.

15. A magenta dye-based ink composition comprising a combination of dyes consisting of (a) one or more red dye(s) and (b) a minor but effective amount of black dye, selected from the group consisting of lightfast black dyes, wherein a weight ratio of red dye(s) to black dye in the combination of dyes ranges from about 20:1 to about 100:1, wherein the amount of black dye in the ink composition ranges from about 0.05 to about 0.25 percent by weight based on a total weight of the ink composition to provide the magenta dye-based ink composition having a ΔE of less than 5.

16. The magenta dye-based ink composition of claim 15 , wherein the black dye in the combination of dyes comprises a lightfast azo direct dye black.

17. The magenta dye-based ink composition of claim 15 , wherein the red dye in the exclusive combination of dyes is selected from the group consisting of acid red dyes, anthrapyridone disulfonic acid dyes, pyridine azo dyes, and mixtures thereof.

18. The magenta dye-based ink composition of claim 15 , further comprising a humectant, a solvent, a penetrant, a surfactant, and water.

19. An ink set comprising the magenta dye-based ink composition of claim 15 , a cyan ink composition, a yellow ink composition.

Assignees

• Funai Electric Co

Inventors

• Edaka Keiichi
• Suthar Ajay K

Classifications

• C09D11/328 Primary

  characterised by dyes · CPC title

• C09B67/0033

  Blends of pigments; Mixtured crystals; Solid solutions · CPC title

• C09D11/30

  Inkjet printing inks · CPC title

• C09D11/40

  Ink-sets specially adapted for multi-colour inkjet printing · CPC title

• C09B67/00

  Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents {grinding or grinding assistants, coating of pigments or dyes}; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films · CPC title