	US 12,404,415 B2
	Ink jet ink composition and recording method
Kenta Kikuchi, Suwa (JP); and Hiroaki Kumeta, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Apr. 25, 2022, as Appl. No. 17/727,875.
Claims priority of application No. 2021-073869 (JP), filed on Apr. 26, 2021.
Prior Publication US 2022/0340772 A1, Oct. 27, 2022
Int. Cl. C09D 11/328 (2014.01); B41J 11/00 (2006.01); B41M 5/00 (2006.01); C09D 11/037 (2014.01); C09D 11/38 (2014.01)

CPC C09D 11/328 (2013.01) [B41J 11/00216 (2021.01); B41M 5/0023 (2013.01); C09D 11/037 (2013.01); C09D 11/38 (2013.01)]

11 Claims

1. An ink jet ink composition comprising:

a color material having a ligand, the color material being derived from a natural product;

an inorganic compound; and

a pH adjuster,

wherein the color material forms a complex with the inorganic compound by the ligand,

wherein the inorganic compound contains a metal-containing oxonium ion or a metal ion,

wherein the ink jet ink composition is a white ink, a black ink, a yellow ink, a magenta ink, a cyan ink, a violet ink, a brown ink, an orange ink, or a green ink, and

wherein the color material includes cochineal or curcumin.