IP Library › Granted Patent US 12686781
Granted Patent B2
US 12686781 · App. 18/882,945 · Granted Jul 21, 2026

Ink jet ink composition and recording method

Inventor: Kentaro Hara (Shiojiri, JP)
Assignee: SEIKO EPSON CORPORATION
C09D11/322B41J2/2114C09D11/38
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Quick Facts
Patent No.
US 12686781
App. No.
18/882,945
Granted
Jul 21, 2026
Kind
B2
Abstract

An aqueous ink jet ink composition includes a color material, an acetylene glycol-based surfactant, glycerin, a 6-, 7-, or 8-membered lactam, in which the content of the glycerin is 9% by mass or less based on the total mass of the ink composition, and the mass ratio of the content of the 6-, 7-, or 8-membered lactam to the content of the acetylene glycol-based surfactant is 0.5 or more and less than 5.

Claims (29)

1 . An aqueous ink jet ink composition, comprising:

a color material;

an acetylene glycol-based surfactant;

glycerin; and

a 6-, 7-, or 8-membered lactam, wherein

a content of the glycerin is 9% by mass or less based on a total mass of the ink jet ink composition, and

a mass ratio of a content of the 6-, 7-, or 8-membered lactam to a content of the acetylene glycol-based surfactant is 0.5 or more and less than 5.

2 . The ink jet ink composition according to claim 1 , comprising a resin.

3 . The ink jet ink composition according to claim 1 , comprising a betaine.

4 . The ink jet ink composition according to claim 2 , wherein

the resin is a water-soluble resin.

5 . The ink jet ink composition according to claim 1 , wherein

the mass ratio of the content of the 6-, 7-, or 8-membered lactam to the content of the acetylene glycol-based surfactant is 2 to 4.

6 . The ink jet ink composition according to claim 2 , wherein

the resin is a water-soluble urethane resin.

7 . The ink jet ink composition according to claim 1 , wherein

the color material includes any one or more of a self-dispersed pigment and a pigment dispersed by a dispersant resin.

8 . The ink jet ink composition according to claim 1 , wherein

a content of inorganic fine particles does not exceed 0.05% by mass based on the total mass of the ink jet ink composition.

9 . The ink jet ink composition according to claim 1 , wherein

the content of the glycerin is 0.5% to 9% by mass based on the total mass of the ink jet ink composition.

10 . The ink jet ink composition according to claim 1 , wherein

the 6-, 7-, or 8-membered lactam includes ε-caprolactam.

11 . The ink jet ink composition according to claim 1 , which is used for recording onto an absorptive recording medium.

12 . The ink jet ink composition according to claim 1 , wherein

the acetylene glycol-based surfactant includes an acetylene glycol-based surfactant having an HLB value of 5 or less.

13 . A recording method, comprising:

an ink adhering step of discharging the ink jet ink composition according to claim 1 from an ink jet head to make the jet ink composition adhere to a recording medium.

14 . The recording method according to claim 13 , performing recording in a line recording method.