	US 12,421,407 B2
	Aqueous ink, ink cartridge and ink jet recording method
Mikio Sanada, Kanagawa (JP); Yoshiyuki Kaneko, Kanagawa (JP); Yoshihisa Yamashita, Osaka (JP); Junichi Sakai, Tokyo (JP); Shoichi Takeda, Kanagawa (JP); and Hideki Yamakami, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Oct. 3, 2022, as Appl. No. 17/937,684.
Claims priority of application No. 2021-165008 (JP), filed on Oct. 6, 2021; and application No. 2022-145604 (JP), filed on Sep. 13, 2022.
Prior Publication US 2023/0108942 A1, Apr. 6, 2023
Int. Cl. C09D 11/322 (2014.01); B41J 2/01 (2006.01); C09D 11/037 (2014.01); C09D 11/102 (2014.01); C09D 11/107 (2014.01); C09D 11/38 (2014.01)

CPC C09D 11/322 (2013.01) [B41J 2/01 (2013.01); C09D 11/037 (2013.01); C09D 11/102 (2013.01); C09D 11/107 (2013.01); C09D 11/38 (2013.01)]

19 Claims

1. An aqueous ink for ink jet recording, comprising:

a titanium oxide particle containing titanium oxide, at least part of a surface of the titanium oxide being covered with alumina and silica,

wherein the titanium oxide particle is dispersed at least by an action of the silica,

a proportion of the alumina in the titanium oxide particle is 0.50 times or more to 1.00 time or less a proportion of the silica in the titanium oxide particle in terms of a mass ratio, and

a ratio (η₁/η_1,000) of a viscosity (η₁) of the aqueous ink at a shear rate of 1 (1/s) to a viscosity (η_1,000) at a shear rate of 1,000 (1/s) is 1.10 times or less.