Inkjet ink, inkjet recording method, ink set, ink medium set, and print medium

Patent metadata

Field	Value
Publication number	US-12552952-B2
Application number	US-202218552562-A
Country	US
Kind code	B2
Filing date	Mar 30, 2022
Priority date	Apr 19, 2021
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

An inkjet ink which contains a coloring agent, an organic compound excluding the coloring agent, and water, and in which the organic compound contains a compound a such as diethyleneglycol monohexyl ether, a compound b such as 1,8-octane diol, and a compound c such as 1,5-pentane diol, and relationships of (a)≤(c) and 0.1≤(c)/(b)≤50 are satisfied, when (a) represents, in parts by mass, the total contained amount of the compound a with respect to 100 parts by mass of the ink, (b) represents, in parts by mass, the total contained amount of the compound b with respect to 100 parts by mass of the ink, and (c) represents, in parts by mass, the total contained amount of the compound c with respect to 100 parts by mass of the ink.

First claim

The invention claimed is:

1 . An inkjet ink comprising a coloring agent, an organic compound excluding the coloring agent, and water, wherein the organic compound satisfies condition (A) or (B) below:
(A)
the organic compound comprises:
a compound a: at least one compound selected from a compound represented by formula (1) below and a compound represented by formula (2) below;
a compound b: at least one compound selected from a compound represented by formula (3) below and a compound represented by formula (4) below; and
a compound c: at least one compound selected from the group consisting of C4-C5 alkanediol, a compound represented by formula (5) below, and a compound represented by formula (6) below,
wherein relationships of (a)≤(c) and 0.1≤(c)/(b)≤50 are satisfied, when (a) represents, in parts by mass, a total contained amount of the compound a with respect to 100 parts by mass of the inkjet ink, (b) represents, in parts by mass, a total contained amount of the compound b with respect to 100 parts by mass of the inkjet ink, and (c) represents, in parts by mass, a total contained amount of the compound c with respect to 100 parts by mass of the inkjet ink; or

(B)
the organic compound comprises:
a compound a: at least one compound selected from a compound represented by formula (1) below and a compound represented by formula (2) below;
a compound b: at least one compound selected from a compound represented by formula (3) below and a compound represented by formula (4) below; and
a compound c: at least one compound selected from the group consisting of C4-C5 alkanediol, a compound represented by formula (5) below, and a compound represented by formula (6) below,
wherein (a) is greater than 0.4, and a relationship of (a)> (c) is satisfied, when (a) represents, in parts by mass, the total contained amount of the compound a with respect to 100 parts by mass of the inkjet ink, and (c) represents, in parts by mass, the total contained amount of the compound c with respect to 100 parts by mass of the inkjet ink:

wherein R 1 represents a linear or branched C5-C10 hydrocarbon group,

wherein R 2 represents a linear or branched C6-C7 hydrocarbon group, and n1 represents 1 or 2,
HO—R 3 —OH  (3)

wherein R 3 represents a linear C7-C12 hydrocarbon group,

wherein R 4 represents a phenyl group or a benzyl group, and n2 represents 1 or 2,

wherein R 5 represents a hydrogen atom or a methyl group, and

wherein R 6 represents a linear or branched C1-C4 hydrocarbon group, and n3 represents 1 or 2.

2 . The inkjet ink according to claim 1 , wherein the organic compound satisfies the condition (A) and a relationship of 1< (c)/(b)≤50 is satisfied.

3 . The inkjet ink according to claim 1 , wherein the coloring agent comprises at least one selected from the group consisting of a pigment and a disperse dye.

4 . An inkjet recording method, comprising discharging a droplet of the inkjet ink according to claim 1 from an inkjet head to perform recording on a printing medium.

5 . The inkjet recording method according to claim 4 , wherein the printing medium is a less ink-absorbent or non-ink-absorbent printing medium.

6 . The inkjet recording method according to claim 4 , wherein the inkjet head comprises a circulation mechanism.

7 . An ink set comprising: the inkjet ink according to claim 1 ; and an additional inkjet ink different from the inkjet ink.

8 . An ink and medium set comprising: the inkjet ink according to claim 1 and a printing medium.

9 . A printed medium to which the inkjet ink according to claim 1 has adhered.

Assignees

• Nippon Kayaku Kk

Inventors

• Kaji Yuki
• Matsumura Aiko
• Yoshida Keishiro
• Misawa Shunta

Classifications

• B41J2/2107

  characterised by the ink properties (supplying ink in a solid state B41J2/17593) · CPC title

• B41J2/01

  Ink jet · CPC title

• C09D11/328

  characterised by dyes · CPC title

• C09D11/322

  Pigment inks · CPC title

• C09D11/54

  Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink · CPC title