US 12,306,580 B2
Toner and production method thereof, and toner stored unit, image forming apparatus, and image forming method
Hiroshi Yamada, Shizuoka (JP); Akinori Saitoh, Shizuoka (JP); Akio Takei, Shizuoka (JP); Yasuo Kamada, Shizuoka (JP); and Toma Takebayashi, Shizuoka (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Hiroshi Yamada, Shizuoka (JP); Akinori Saitoh, Shizuoka (JP); Akio Takei, Shizuoka (JP); Yasuo Kamada, Shizuoka (JP); and Toma Takebayashi, Shizuoka (JP)
Filed on Aug. 12, 2021, as Appl. No. 17/400,226.
Claims priority of application No. 2020-137006 (JP), filed on Aug. 14, 2020; application No. 2021-048048 (JP), filed on Mar. 23, 2021; and application No. 2021-127199 (JP), filed on Aug. 3, 2021.
Prior Publication US 2022/0050395 A1, Feb. 17, 2022
Int. Cl. G03G 9/097 (2006.01); G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/09 (2006.01); G03G 9/093 (2006.01); G03G 15/08 (2006.01)
CPC G03G 9/08726 (2013.01) [G03G 9/0802 (2013.01); G03G 9/0819 (2013.01); G03G 9/08711 (2013.01); G03G 9/08782 (2013.01); G03G 9/09 (2013.01); G03G 9/09321 (2013.01); G03G 15/0896 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A toner, comprising:
toner particles, each comprising:
a toner base particle including a binder resin, a colorant, and wax; and
resin particles on a surface of the toner base particle,
wherein Formulae 1 to 3 below are satisfied, where M is a volume average primary particle diameter (nm) of the resin particles, and L is a distance (nm) between the resin particles present next to one another on the surface of the toner base particle:
M<L;  (Formula 1)
5 (nm)<M≤60 (nm); and  (Formula 2)
0.40≤[M (nm)/L (nm)]<0.90;  (Formula 3)
wherein the resin particles each include a core resin and a shell resin covering at least part of a surface of the core resin.