Dispersant, dispersion, ink composition, and methods of preparation thereof

• US 10,640,662 B2
• Filed: 10/30/2017
• Issued: 05/05/2020
• Est. Priority Date: 10/31/2016
• Status: Active Grant

• Current Assignee: Nissin Chemical Industry Co., Ltd. (Shin-Etsu Chemical Company Limited)
• Original Assignee: Nissin Chemical Industry Co., Ltd. (Shin-Etsu Chemical Company Limited)
• Inventors: Nishikawa, Tomoyuki
• Primary Examiner(s): Klemanski, Helene
• Application Number:
  US15/797,622
• Publication Number:
  US 20180118961A1
• Time in Patent Office: 918 Days
• Field of Search: None
• CPC Class Codes: C09D 11/03 characterised by features other than the chemical nature of the binder
• CPC Class Codes: C09D 11/16 Writing inks
• CPC Class Codes: C09D 11/38 characterised by non-macromolecular additives other than solvents, pigments or dyes

Abstract

A novel dispersant contains a specific acetylene glycol and/or a specific acetylene glycol ethoxylate in combination with a specific arylphenol compound. Even when added in a small amount, the dispersant rapidly disperses disperse dyes and pigments and moreover exhibits excellent wettability and antifoaming properties. Dispersions and ink compositions containing the dispersant are also disclosed.

Claims

1. A dispersion comprising

a dispersant,

a disperse dye or pigment or both, and

an aqueous solvent,

wherein the dispersant comprises:

(A) from 1 to 50 wt % of at least one compound selected from the group consisting of acetylene glycols of formula (1) below

2. The dispersion of claim 1, wherein the amount of component (A) is from 3 to 35 wt % and the amount of component (B) is included from 65 to 97 wt %, of the overall the dispersant.

3. The dispersion of claim 1, wherein the aqueous solvent is water or a combination of water and dipropylene glycol.

4. The dispersion of claim 1, wherein the acetylene glycol of formula (1) is selected from the group consisting of:

2,5,8,11-tetramethyl-6-dodecyn-5,8-diol;

5,8-dimethyl-6-dodecyn-5,8-diol;

2,4,7,9-tetramethyl-5-decyn-4,7-diol;

4,7-dimethyl-5-decyn-4,7-diol;

2,3,6,7-tetramethyl-4-octyn-3,6-diol;

3,6-dimethyl-4-octyn-3,6-diol;

2,5-dimethyl-3-hexyn-2,5-diol; and

mixtures thereof.

5. The dispersion of claim 1, wherein the acetylene glycol of formula (2) is selected from the group consisting of:

the ethoxylate of 2,5,8,11-tetramethyl-6-dodecyn-5,8-diol (average value for m+n=6);

the ethoxylate of 2,4,7,9-tetramethyl-5-decyn-4,7-diol (average value for m+n=10);

the ethoxylate of 2,4,7,9-tetramethyl-5-decyn-4,7-diol (average value for m+n=4);

the ethoxylate of 3,6-dimethyl-4-octyn-3,6-diol (average value for m+n=4); and

mixtures thereof.

6. The dispersion of claim 1, wherein the amount of component (A) is from 3 to 35 wt. %.

7. The dispersion of claim 1, wherein the arylphenol compound of formula (3) is selected from the group consisting of:

polyoxyethylene tristyrylphenyl ether;

polyoxyethylene tetrastyrylphenyl ether;

polyoxyethylene tribenzylphenyl ether; and

mixtures thereof.

8. The dispersion of claim 1, wherein the amount of component (B) is from 65 to 97 wt. %.

9. The dispersion of claim 1, wherein the amount of dispersant content is from 3 to 50 parts by weight.

10. The dispersion of claim 1, wherein the amount of dispersant content is from 5 to 20 parts by weight.

11. The dispersion of claim 1, wherein the dispersion has a viscosity of not more than 10.0 mPa·

s when measured at 25°

C.

12. The dispersion of claim 1, wherein the disperse dye and/or pigment have an average median diameter (D₅₀) particle size of not more than 300 nm.

13. The dispersion of claim 1, wherein the dispersion has a static surface tension that is not more than 50 mN/m.

14. The dispersion of claim 1, wherein the foamability of the dispersion is not more than 20 mL immediately after shaking.

15. A method for preparing the dispersion of claim 1, comprising the step of mixing together and dispersing the dispersant, the disperse dye or pigment or both, and the aqueous solvent.

16. An ink composition comprising the dispersion of claim 1.

17. A method for preparing an ink composition, comprising the steps of:

mixing the dispersion of claim 1 with at least one substance selected from the group consisting of water, water-soluble organic solvents, resins, ultraviolet absorbers, antioxidants, pH adjustors, preservatives and viscosity modifiers.