IP Library › Granted Patent US 12692402
Granted Patent B2
US 12692402 · App. 17/488,439 · Granted Jul 28, 2026

Ink jet ink set and recording method

Inventors: Kenji Kitada (Shiojiri, JP); Takeshi Yano (Shiojiri, JP); Shinichi Naito (Chino, JP); Kenta Kikuchi (Suwa, JP); Hirofumi Hokari (Chino, JP)
Assignee: SEIKO EPSON CORPORATION
C09D11/322D06P5/00
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Quick Facts
Patent No.
US 12692402
App. No.
17/488,439
Granted
Jul 28, 2026
Kind
B2
Abstract

One aspect of the ink jet ink set according to the present disclosure is an ink jet ink set including an anionic ink containing an anionic resin, a pigment, and water, and a cationic ink containing a cationic resin, a pigment, and water, in which the anionic ink and the cationic ink are similar colors to each other, the pigment in the anionic ink is coated with the anionic resin, the pigment in the cationic ink is coated with the cationic resin, and the anionic resin or the cationic resin, or both have a urethane-based skeleton or a polyester-based skeleton.

Claims (19)

1 . An ink jet ink set comprising:

an anionic ink containing an anionic resin, a pigment, and water; and

a cationic ink containing a cationic resin, a pigment, and water,

wherein the anionic ink and the cationic ink are similar colors to each other,

the pigment in the anionic ink is coated with the anionic resin,

the pigment in the cationic ink is coated with the cationic resin,

the anionic resin or the cationic resin, or both have a urethane-based skeleton or a polyester-based skeleton,

the cationic resin includes a monomer for imparting a cationic group to the cationic resin, and the monomer includes 4-vinylpyridine, and

the anionic resin includes a polyurethane prepolymer having allophanate and biuret groups.

2 . The ink jet ink set according to claim 1 , wherein

the anionic resin and the cationic resin have the urethane-based skeleton.

3 . The ink jet ink set according to claim 1 , wherein

the urethane-based skeleton contains one or more selected from polycarbonate, polyether, and polyester.

4 . The ink jet ink set according to claim 1 , wherein

the anionic resin and the cationic resin have a blocked isocyanate group.

5 . A recording method using the ink jet ink set according to claim 1 , the method comprising:

ejecting the anionic ink from an ink jet head to be attached to a recording medium; and

ejecting the cationic ink from the ink jet head to be attached to the recording medium, wherein

a region on the recording medium to which the anionic ink is attached and an area on the recording medium to which the cationic ink is attached overlap in part or as a whole.