US 12,468,236 B2
External additive for toner, and toner
Yuzo Seino, Shizuoka (JP); Daisuke Yoshiba, Shizuoka (JP); Koki Inoue, Shizuoka (JP); and Yuki Masuda, Shizuoka (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jun. 24, 2022, as Appl. No. 17/808,750.
Claims priority of application No. 2021-110963 (JP), filed on Jul. 2, 2021; and application No. 2022-090407 (JP), filed on Jun. 2, 2022.
Prior Publication US 2023/0004099 A1, Jan. 5, 2023
Int. Cl. G03G 9/097 (2006.01); G03G 9/08 (2006.01)
CPC G03G 9/09725 (2013.01) [G03G 9/0819 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An external additive for a toner, comprising:
a silica particle surface-treated with a polyhydric acid metal salt particle, wherein
the polyhydric acid metal salt particle is a particle of a titanium phosphate compound or a titanium carbonate compound, and
the external additive has a relative dielectric constant of 2.10 to 2.20 at the frequency at which a dielectric loss tangent tan δ is minimum in a sweep frequency range of 1 MHz to 0.01 Hz.