Granted Patent B2

US 12,258,480 · App. 17/605,159 · Granted Mar 25, 2025

Inventors: Kazushi Sunaoshi (Tokyo, JP); Masahiro Sugihara (Tokyo, JP); Yuki Sasaki (Tokyo, JP)

Assignees: artience Co., Ltd.; TOYOCOLOR CO., LTD.

C09D11/107B41M5/0023C09D11/033C09D11/037C09D11/38

Abstract

Claims (28)

1. An aqueous inkjet ink comprising a pigment, a binder resin, a water-soluble organic solvent, a surfactant and water, wherein

the binder resin comprises an aqueous resin containing, as structural units, a structure derived from an ethylenically unsaturated monomer containing an acid group and a structure derived from an ethylenically unsaturated monomer containing a hydroxyl group, wherein a hydroxyl value of the aqueous resin is from 1 to 50 mgKOH/g;

the aqueous resin has a weight average molecular weight of 5,000 to 45,000, and a glass transition temperature of 35 to 110° C.;

the water-soluble organic solvent comprises a first water-soluble organic solvent having an SP value of 8.5 to 13 (cal/cm3)1/2, and does not contain a second water-soluble organic solvent having a boiling point at 1 atmosphere of 235° C. or higher; and

the surfactant contains an acetylene-based surfactant.

2. The aqueous inkjet ink according to claim 1 , wherein the water-soluble organic solvent comprises a water-soluble organic solvent having a boiling point of 200° C. or lower in an amount of at least 60% by mass of a total mass of the water-soluble organic solvent.

3. An aqueous inkjet ink comprises a pigment, a binder resin, a water-soluble organic solvent, a surfactant and water, wherein

the binder resin comprises an aqueous resin containing, as structural units, a structure derived from an ethylenically unsaturated monomer containing an acid group and a structure derived from an ethylenically unsaturated monomer containing a hydroxyl group, wherein a hydroxyl value of the aqueous resin is from 1 to 50 mgKOH/g;

the aqueous resin has a weight average molecular weight of 5,000 to 45,000, and a glass transition temperature of 35 to 110° C.;

the water-soluble organic solvent contains a first water-soluble organic solvent having an SP value of 8.5 to 13 (cal/cm3)1/2, and a second water-soluble organic solvent having a boiling point at 1 atmosphere of 235° C. or higher;

an amount of the second water-soluble organic solvent is greater than 0% by mass but not more than 5% by mass relative to a total mass of the aqueous inkjet ink; and

the surfactant comprises an acetylene-based surfactant.

4. The aqueous inkjet ink according to claim 1 , wherein the first water-soluble organic solvent comprises at least one selected from the group consisting of 1,2-propanediol and 1,2-butanediol in an amount of 5 to 30% by mass relative to a total mass of the aqueous inkjet ink.

5. The aqueous inkjet ink according to claim 1 , wherein the first water-soluble organic solvent comprises one or more propylene glycol ether-based solvents selected from the group consisting of propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether and dipropylene glycol monomethyl ether, in an amount of 1 to 15% by mass relative to a total mass of the aqueous inkjet ink.

6. The aqueous inkjet ink according to claim 1 , wherein an acid value of the aqueous resin is from 10 to 60 mgKOH/g.

7. The aqueous inkjet ink according to claim 1 , wherein a hydroxyl value of the aqueous resin is from 15 to 45 mgKOH/g.

8. An aqueous inkjet ink set comprising two or more aqueous inkjet inks having different hues from each other, wherein

each of the two or more aqueous inkjet inks is the aqueous inkjet ink according to claim 1 .

9. A method for producing an aqueous inkjet ink printed matter, the method having a step of discharging from an inkjet head and adhering to a substrate the aqueous inkjet ink according to claim 1 , and a step of drying the substrate with the adhered aqueous inkjet ink.

10. A printed matter obtained by printing the aqueous inkjet ink according to a claim 1 , or the aqueous inkjet ink set according to claim 8 onto a substrate.

11. The aqueous inkjet ink according to claim 3 , wherein the first water-soluble organic solvent comprises at least one selected from the group consisting of 1,2-propanediol and 1,2-butanediol in an amount of 5 to 30% by mass relative to a total mass of the aqueous inkjet ink.

12. The aqueous inkjet ink according to claim 3 , wherein the first water-soluble organic solvent comprises one or more propylene glycol ether-based solvents selected from the group consisting of propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether and dipropylene glycol monomethyl ether, in an amount of 1 to 15% by mass relative to a total mass of the aqueous inkjet ink.

13. The aqueous inkjet ink according to claim 3 , wherein an acid value of the aqueous resin is from 10 to 60 mgKOH/g.

14. The aqueous inkjet ink according to claim 3 , wherein a hydroxyl value of the aqueous resin is from 15 to 45 mgKOH/g.

15. An aqueous inkjet ink set comprising two or more aqueous inkjet inks having different hues from each other, wherein

each of the two or more aqueous inkjet inks is the aqueous inkjet ink according to claim 3 .

16. A method for producing an aqueous inkjet ink printed matter, the method having a step of discharging from an inkjet head and adhering to a substrate the aqueous inkjet ink according to claim 3 , and a step of drying the substrate with the adhered aqueous inkjet ink.

17. A printed matter obtained by printing the aqueous inkjet ink according to a claim 3 onto a substrate.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (36)