US 12,140,905 B2
Method for producing a toner
Shohei Yamashita, Tokyo (JP); Takeshi Tsujino, Shizuoka (JP); Junya Asaoka, Shizuoka (JP); Yuu Sasano, Shizuoka (JP); Yuhei Terui, Shizuoka (JP); Koki Inoue, Shizuoka (JP); and Shota Amano, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jun. 2, 2021, as Appl. No. 17/336,386.
Claims priority of application No. 2020-099401 (JP), filed on Jun. 8, 2020.
Prior Publication US 2021/0382406 A1, Dec. 9, 2021
Int. Cl. G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/097 (2006.01)
CPC G03G 9/0804 (2013.01) [G03G 9/0819 (2013.01); G03G 9/08711 (2013.01); G03G 9/09708 (2013.01)] 14 Claims
 
1. A method for producing a toner comprising a toner particle comprising a binder resin, and having an external additive, the method comprising the steps of:
dispersing the toner particle and an inorganic dispersant in an aqueous medium to obtain an aqueous dispersion of the toner particle;
adding the external additive to the aqueous dispersion; and
fixing the external additive to the toner particle in the aqueous dispersion, wherein
the toner particle dispersion is held at a temperature of T1 (° C.) for at least 15 minutes during or after the step of adding, or during or after the step of fixing, where Tg−10° C.<T1<Tg+25° C. and Tg (° C.) is the glass transition temperature of the toner particle, and
in the step of dispersing, a coverage ratio of the inorganic dispersant relative to the surface of the toner particle that is dispersed in the toner particle dispersion is 20 to 50 area %.