Aqueous inkjet ink composition and printed matter

Patent metadata

Field	Value
Publication number	US-2025270411-A1
Application number	US-202318857279-A
Country	US
Kind code	A1
Filing date	Mar 1, 2023
Priority date	May 10, 2022
Publication date	Aug 28, 2025
Grant date	—

Abstract

An aqueous inkjet ink composition containing a pigment, an anionic group-containing resin, a resin emulsion, a surfactant, a water-soluble solvent, and water, in which a water-soluble solvent having a boiling point of at most 200° C. under 1 atm accounts for at least 90 mass % of the water-soluble solvent; the surfactant contains a polyoxyethylene alkyl ether and a silicone-based surfactant satisfying a specific condition; and the polyoxyethylene alkyl ether has an HLB value of 7-12. The aqueous inkjet ink composition has excellent discharge stability, favorable filling in a solid part and no unevenness even when printed and recorded on a non-absorptive print medium, and excellent drying properties on a paper surface.

First claim

What is claimed is:

1 . An aqueous inkjet ink composition comprising a pigment; an anionic group-containing resin; a resin emulsion; a surfactant; a water-soluble solvent; and water,
wherein the water-soluble solvent contains a water-soluble solvent having a boiling point of 200° C. or less at 1 atmospheric pressure at 90% by mass or more, the surfactant contains a polyoxyethylene alkyl ether and a silicone-based surfactant, the polyoxyethylene alkyl ether has an HLB value of 7 or more and 12 or less, and the silicone-based surfactant satisfies the following requirements:
a maximum value of a transmittance of a mixture composed of 99.9 parts by mass of water and 0.1 parts by mass of the silicone-based surfactant at 25° C. and a wavelength of 380 nm to 780 nm is 30% or less, and
a maximum value of a transmittance of a mixture composed of 89.9 parts by mass of water, 10 parts by mass of diethylene glycol monobutyl ether, and 0.1 parts by mass of the silicone-based surfactant at 25° C. and a wavelength of 380 nm to 780 nm is 95% or more.

2 . The aqueous inkjet ink composition according to claim 1 , further comprising one or more surfactants selected from the group consisting of an acetylene diol-based surfactant and an alkane diol-based surfactant.

3 . The aqueous inkjet ink composition according to claim 1 , wherein the water-soluble solvent having a boiling point of 200° C. or less at 1 atmospheric pressure is propylene glycol.

4 . The aqueous inkjet ink composition according to claim 1 , wherein the resin emulsion is one or more selected from the group consisting of an acrylic resin emulsion and a styrene-acrylic resin emulsion.

5 . The aqueous inkjet ink composition according to claim 1 , wherein a glass transition temperature of a resin in the resin emulsion is-35° C. or more and 35° C. or less.

6 . The aqueous inkjet ink composition according to claim 1 , wherein the polyoxyethylene alkyl ether is a branched chain having an alkyl group having 10 or more and 15 or less carbon atoms, and has an average number of moles of ethyleneoxy groups added of 3 or more and 10 or less.

7 . A printed matter obtained by performing printing using the aqueous inkjet ink composition according to claim 1 .

8 . The aqueous inkjet ink composition according to claim 2 , wherein the water-soluble solvent having a boiling point of 200° C. or less at 1 atmospheric pressure is propylene glycol.

9 . The aqueous inkjet ink composition according to claim 2 , wherein the resin emulsion is one or more selected from the group consisting of an acrylic resin emulsion and a styrene-acrylic resin emulsion.

10 . The aqueous inkjet ink composition according to claim 2 , wherein a glass transition temperature of a resin in the resin emulsion is −35° C. or more and 35° C. or less.

11 . The aqueous inkjet ink composition according to claim 2 , wherein the polyoxyethylene alkyl ether is a branched chain having an alkyl group having 10 or more and 15 or less carbon atoms, and has an average number of moles of ethyleneoxy groups added of 3 or more and 10 or less.

12 . A printed matter obtained by performing printing using the aqueous inkjet ink composition according to claim 2 .

Assignees

• Sakata Inx Corp

Inventors

• Hirakawa Satoshi
• Ueki Masahiro
• Watanabe Yuya
• Konishi Hiroyuki
• Maeda Hirohito

Classifications

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title

• C09D11/322 Primary

  Pigment inks · CPC title

• C09D11/38 Primary

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• C09K23/54

  Silicon compounds · CPC title

• C09K23/42

  Ethers, e.g. polyglycol ethers of alcohols or phenols · CPC title