Aqueous inkjet ink and printed matter

Patent metadata

Field	Value
Publication number	US-12435235-B2
Application number	US-202418879576-A
Country	US
Kind code	B2
Filing date	Mar 28, 2024
Priority date	Nov 22, 2023
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

An embodiment of the present invention relates to an aqueous inkjet ink containing a pigment, a binder resin, a water-soluble organic solvent, an unmodified acetylene diol-based surfactant (A1), and an alkylene oxide-modified acetylene diol-based surfactant (A2) having an HLB value of 4 to 10, wherein contents of the unmodified acetylene diol-based surfactant (A1) and the alkylene oxide-modified acetylene diol-based surfactant (A2) are defined, and a ratio between the content of the unmodified acetylene diol-based surfactant (A1) and the content of the alkylene oxide-modified acetylene diol-based surfactant (A2) is 10 to 5,000.

First claim

The invention claimed is:

1. An aqueous inkjet ink comprising a pigment, a binder resin, a water-soluble organic solvent, and an acetylene diol-based surfactant (A), wherein
the acetylene diol-based surfactant (A) contains an unmodified acetylene diol-based surfactant (A1) and an alkylene oxide-modified acetylene diol-based surfactant (A2) having an HLB value of 4 to 10,
a content of the unmodified acetylene diol-based surfactant (A1) is 5 to 2,000 ppm with respect to a total amount of the aqueous inkjet ink,
a content of the alkylene oxide-modified acetylene diol-based surfactant (A2) is 0.2 to 5% by mass with respect to the total amount of the aqueous inkjet ink, and
a ratio between the content of the unmodified acetylene diol-based surfactant (A1) and the content of the alkylene oxide-modified acetylene diol-based surfactant (A2) [surfactant (A2)/surfactant (A1)] is within a range of 10 to 5,000.

2. The aqueous inkjet ink according to claim 1 , further comprising a nonionic surfactant (B) other than the acetylene diol-based surfactant.

3. The aqueous inkjet ink according to claim 2 , wherein a mass factor-added HLB value calculated by the following Formula (1) is 0.3 to 2.0
Formula (1):

[

Mass
⁢

factor

-

added
⁢

HLB
⁢

value

]

=

[

Mathematical
⁢

Formula
⁢

1

]

∑

i
=
1

l

⁢

(

HLB
i

×

WT
i

)

+

∑

j
=
1

m

⁢

(

HLB
j

×

WT
j

)

∑

k
=
1

n

⁢

(

HLB
k

×

WT
k

)

(wherein i represents a type of surfactant used as the unmodified acetylene diol-based surfactant (A1), and l represents the number of types of surfactants used as the unmodified acetylene diol-based surfactant (A1), j represents a type of surfactant used as the alkylene oxide-modified acetylene diol-based surfactant (A2), and m represents the number of types of surfactants used as the alkylene oxide-modified acetylene diol-based surfactant (A2), k represents a type of surfactant used as the nonionic surfactant (B), and n represents the number of types of surfactants used as the nonionic surfactant (B), HLB i represents an HLB value of the surfactant i, WT i represents a content (% by mass) of the surfactant i with respect to a total mass of the aqueous inkjet ink, HLB j represents an HLB value of the surfactant j, WT j represents a content (% by mass) of the surfactant j with respect to the total mass of the aqueous inkjet ink, HLB k represents an HLB value of the surfactant k, and WT k represents a content (% by mass) of the surfactant k with respect to the total mass of the aqueous inkjet ink).

4. The aqueous inkjet ink according to claim 2 , wherein the nonionic surfactant (B) contains a silicon-based surfactant.

5. The aqueous inkjet ink according to claim 1 , wherein the water-soluble organic solvent contains 1,2-propanediol, and a content of the 1,2-propanediol is 5 to 30% by mass with respect to the total amount of the aqueous inkjet ink.

6. A printed matter obtained by printing the aqueous inkjet ink according to claim 1 on a printing substrate.

Assignees

• Artience Co Ltd
• Toyocolor Co Ltd

Inventors

• Sunaoshi Kazushi
• Nomura Takanori
• Morita Riho

Classifications

• C09D11/033

  characterised by the solvent · CPC title

• C09D11/102

  containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds · CPC title

• B41M5/00

  Duplicating or marking methods; Sheet materials for use therein (by using light-sensitive materials G03; electrography, magnetography G03G {; repeatedly usable boards or tablets for writing or drawing B43L1/00}) · CPC title

• B41J2/01

  Ink jet · CPC title

• C09D11/30

  Inkjet printing inks · CPC title