US 12,306,579 B2
Toner
Kazuyuki Sato, Kanagawa (JP); Tomohisa Sano, Shizuoka (JP); Daisuke Yoshiba, Shizuoka (JP); and Tohru Hiramatsu, Shizuoka (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 11, 2021, as Appl. No. 17/524,353.
Claims priority of application No. 2020-199150 (JP), filed on Nov. 30, 2020.
Prior Publication US 2022/0171302 A1, Jun. 2, 2022
Int. Cl. G03G 9/08 (2006.01); G03G 9/083 (2006.01); G03G 9/087 (2006.01); G03G 9/097 (2006.01)
CPC G03G 9/0825 (2013.01) [G03G 9/0819 (2013.01); G03G 9/0839 (2013.01); G03G 9/08711 (2013.01); G03G 9/08755 (2013.01); G03G 9/09733 (2013.01)] 8 Claims
 
1. A toner, comprising:
a toner particle comprising a binder resin, a crystalline material and a colorant;
the crystalline material being a wax or a crystalline polyester resin; and
the colorant being a hydrophobized magnetic material that is hydrophobic-treated with a silane coupling agent, wherein

OG Complex Work Unit Math
when S1 (%) is a ratio of an area occupied by the crystalline material per area of a toner particle surface observed with a scanning electron microscope (SEM) after ruthenium-staining the toner in a ruthenium tetroxide (RuO4) gas atmosphere at 100 Pa for 5 minutes, and
S2 (%) is a ratio of an area occupied by the crystalline material per area of the toner particle surface and R2 (nm) is a dispersion diameter of a plurality of domains formed of the crystalline material on the toner particle surface, observed with the scanning electron microscope (SEM) after ruthenium-staining the toner in the ruthenium tetroxide (RuO4) gas atmosphere at 500 Pa for 15 minutes.