	US 12,312,481 B2
	Aqueous ink, ink cartridge and ink jet recording method
Misaki Sugie, Kanagawa (JP); and Yuki Nishino, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Sep. 19, 2022, as Appl. No. 17/947,335.
Claims priority of application No. 2021-158230 (JP), filed on Sep. 28, 2021; and application No. 2022-136912 (JP), filed on Aug. 30, 2022.
Prior Publication US 2023/0287228 A1, Sep. 14, 2023
Int. Cl. C09D 11/324 (2014.01); B41J 2/21 (2006.01); C09D 11/38 (2014.01)

CPC C09D 11/324 (2013.01) [C09D 11/38 (2013.01); B41J 2/2107 (2013.01)]

20 Claims

1. An aqueous ink for ink jet comprising a self-dispersible carbon black and a resin particle formed of an acrylic resin,

wherein the carbon black has a DBP oil absorption of 120 mL/100 g or more,

wherein the resin particle has (i) a structure crosslinked by a unit derived from a polyfunctional (meth)acrylate and (ii) a glass transition temperature of 30° C. or more,

wherein a mass ratio of a content (% by mass) of the resin particle to a content (% by mass) of the carbon black is 0.10 times or more to 2.0 times or less, and

wherein the carbon black is a self-dispersible pigment in which an anionic group is bonded to a surface of a particle of the carbon black through another atomic group.