US 11,702,556 B2
Aqueous ink, ink cartridge and ink jet recording method
Yasuaki Murai, Tokyo (JP); Kuniaki Fujimoto, Fukushima (JP); and Saki Tasaki, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 9, 2020, as Appl. No. 17/92,417.
Claims priority of application No. 2019-204529 (JP), filed on Nov. 12, 2019; and application No. 2020-168317 (JP), filed on Oct. 5, 2020.
Prior Publication US 2021/0139724 A1, May 13, 2021
Int. Cl. C09D 11/328 (2014.01); C09D 11/037 (2014.01); B41M 5/00 (2006.01); B41J 2/175 (2006.01); C09B 67/22 (2006.01)
CPC C09D 11/328 (2013.01) [B41J 2/17503 (2013.01); B41M 5/0023 (2013.01); C09B 67/0059 (2013.01); C09D 11/037 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An aqueous ink for ink jet comprising a first coloring material and a second coloring material,
wherein the first coloring material is a compound represented by general formula (1), and
the second coloring material is a compound represented by general formula (2):

OG Complex Work Unit Chemistry
in general formula (1), M's each independently represent a hydrogen atom, alkali metal, ammonium or organic ammonium,

OG Complex Work Unit Chemistry
in general formula (2), R1 and R2 each independently represent a hydrogen atom, —COOM or —SO3M, and M's each independently represent a hydrogen atom, alkali metal, ammonium or organic ammonium.