US 12,305,046 B2
Ink jet ink composition and ink jet printing method
Kei Hiruma, Chino (JP); Mitsunobu Nakatani, Shiojiri (JP); Tomoyuki Ushiyama, Chino (JP); and Kenta Tsukada, Shiojiri (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Mar. 28, 2023, as Appl. No. 18/127,070.
Claims priority of application No. 2022-054175 (JP), filed on Mar. 29, 2022.
Prior Publication US 2023/0312955 A1, Oct. 5, 2023
Int. Cl. C09D 11/322 (2014.01); B41M 7/00 (2006.01)
CPC C09D 11/322 (2013.01) [B41M 7/0081 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An ink jet ink composition used by being ejected from an ink jet head with a nozzle diameter L for printing, the ink jet ink composition comprising:
a metal pigment surface-modified with a surface treatment agent, the metal pigment being in a form of scale-like particles having a volume average particle size D50 of 1.0 μm or less and an average thickness Z with a ratio D50/Z of the volume average particle size D50 to the average thickness Z being 17 or more, the metal pigment having a ratio D50/L of the volume average particle size D50 to the nozzle diameter L of the ink jet head being 0.050 or less; and
a liquid medium selected from the group consisting of organic solvents and water,
wherein
the surface treatment agent contains at least one selected from the group consisting of compounds represented by the following formula (1) and compounds represented by the following formula (2):
(R1—)P(O)(OH)2  (1)
wherein R1 represents a substituted or unsubstituted hydrocarbon group with 14 or more carbon atoms, and
(R2—O—)aP(O)(OH)3-a  (2)
wherein R2s each independently represent a substituted or unsubstituted hydrocarbon group having a carbon skeleton with 14 or more carbon atoms, and a represents 1 or 2.