	US 12,493,250 B2
	External additive particles, toner, and method for producing external additive particles
Jun Shirakawa, Saitama (JP); Akio Maruyama, Tokyo (JP); Kei Inoue, Kanagawa (JP); Waka Hasegawa, Tokyo (JP); and Yukio Nagase, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 24, 2021, as Appl. No. 17/535,462.
Claims priority of application No. 2020-200521 (JP), filed on Dec. 2, 2020; and application No. 2021-146787 (JP), filed on Sep. 9, 2021.
Prior Publication US 2022/0171305 A1, Jun. 2, 2022
Int. Cl. G03G 9/097 (2006.01); C08F 212/08 (2006.01); C08F 220/28 (2006.01); C08K 3/30 (2006.01); C08K 5/42 (2006.01); C08K 5/544 (2006.01)

CPC G03G 9/09775 (2013.01) [C08F 212/08 (2013.01); C08F 220/282 (2020.02); C08K 3/30 (2013.01); C08K 5/42 (2013.01); C08K 5/544 (2013.01); C08K 2003/3045 (2013.01)]

13 Claims

1. External additive particles comprising a polymer containing a sulfur atom and a nitrogen atom,

wherein the polymer includes a vinyl polymer moiety and a siloxane moiety,

relative to a total number of carbon atoms, oxygen atoms, and silicon atoms constituting the external additive particles, a ratio of a number of the silicon atoms constituting the external additive particles is 4.0% or more and 25.0% or less,

in surfaces of the external additive particles analyzed by X-ray photoelectron spectroscopy, relative to a total number of carbon atoms, nitrogen atoms, oxygen atoms, silicon atoms, and sulfur atoms, a ratio of a number of the nitrogen atoms is 0.40% or more and 2.50% or less, and a ratio of a number of the sulfur atoms is 0.05% or more and 0.25% or less, and

the external additive particles subjected to ²⁹Si-NMR measurement satisfy Formula (P1):

Integral value of Unit T/{(Integral value of Unit M)+(Integral value of Unit D)+(Integral value of Unit T)+(Integral value of Unit Q)}≥60% Formula (P1).