US 12,276,938 B2
Toner
Mayumi Inoue, Shizuoka (JP); Takashi Kenmoku, Shizuoka (JP); Yoshiaki Shiotari, Shizuoka (JP); and Shohei Kototani, Shizuoka (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jun. 14, 2022, as Appl. No. 17/806,850.
Claims priority of application No. 2021-102554 (JP), filed on Jun. 21, 2021; and application No. 2022-078276 (JP), filed on May 11, 2022.
Prior Publication US 2022/0413407 A1, Dec. 29, 2022
Int. Cl. G03G 9/093 (2006.01); G03G 9/08 (2006.01); G03G 9/087 (2006.01)
CPC G03G 9/09321 (2013.01) [G03G 9/0819 (2013.01); G03G 9/08711 (2013.01); G03G 9/08722 (2013.01); G03G 9/09342 (2013.01)] 7 Claims
 
1. A toner, comprising a toner particle, wherein
the toner particle has a core-shell structure comprising a core particle and a shell on a surface of the core particle,
the shell comprises a polymer having monomer units represented by Formula (I) below,
the toner comprises an external additive A having a particle diameter of 30 to 300 nm,
the external additive A is at least one selected from the group consisting of silica fine particles and organosilicon polymer fine particles, and
a ratio of coverage of a surface of the toner particle with the external additive A is 0.3 area % or higher:

OG Complex Work Unit Chemistry
in Formula (I), L1 represents —COO(CH2)n— (where n is an integer of 1 to 10), and carbonyl of L1 is bonded to a carbon atom of a main chain; R1 represents hydrogen or a methyl group; and R2 to R10 represent each independently an alkyl group having 1 to 4 carbon atoms.