US 12,215,241 B2
Printing ink jet ink composition and recording method
Tomohiro Aruga, Matsumoto (JP); Kohei Ishida, Matsumoto (JP); and Natsumi Okada, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Mar. 28, 2023, as Appl. No. 18/127,055.
Claims priority of application No. 2022-052794 (JP), filed on Mar. 29, 2022.
Prior Publication US 2023/0312963 A1, Oct. 5, 2023
Int. Cl. C09D 11/00 (2014.01); B41J 2/14 (2006.01); C09D 11/033 (2014.01); C09D 11/037 (2014.01); C09D 11/328 (2014.01); C09D 11/38 (2014.01); D06P 1/39 (2006.01); D06P 1/649 (2006.01); D06P 5/30 (2006.01)
CPC C09D 11/328 (2013.01) [B41J 2/14 (2013.01); C09D 11/033 (2013.01); C09D 11/037 (2013.01); C09D 11/38 (2013.01); D06P 1/39 (2013.01); D06P 1/6497 (2013.01); D06P 5/30 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A printing ink jet ink composition comprising:
an acidic dye;
a water-soluble organic solvent;
a lactam compound; and
water,
wherein the acidic dye includes at least one selected from the group consisting of C.I. Acid Black 172 and C.I. Acid Black 52:1,
a content of the acidic dye with respect to a total mass of the ink composition is 10 percent by mass or more, the water-soluble organic solvent includes a glycol ether compound having a standard boiling point of 195° C. to 290° C.,
the lactam compound includes at least one selected from the group consisting of 1-(2-hydroxyethyl)-2-pyrrolidone and ε-caprolactam, and
a mass ratio of the lactam compound to the glycol ether compound is 3.5 to 20.