US 12,253,824 B2
Toner
Kenichi Nakayama, Shizuoka (JP); Naoya Isono, Shizuoka (JP); Yoshiaki Shiotari, Shizuoka (JP); and Hirofumi Kyuushima, Tokyo (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Sep. 3, 2021, as Appl. No. 17/466,306.
Claims priority of application No. 2020-152278 (JP), filed on Sep. 10, 2020.
Prior Publication US 2022/0075284 A1, Mar. 10, 2022
Int. Cl. G03G 9/097 (2006.01); G03G 9/08 (2006.01); G03G 9/093 (2006.01)
CPC G03G 9/09725 (2013.01) [G03G 9/0819 (2013.01); G03G 9/0825 (2013.01); G03G 9/09321 (2013.01); G03G 9/09328 (2013.01); G03G 9/09364 (2013.01); G03G 9/09371 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A toner, comprising:
a toner particle having a core-shell structure comprising a core particle, and a shell formed on a surface of the core particle;
the core particle comprising a resin component, with the only resin in the core particle being polyester resin;
the shell comprising a styrene-acrylic resin component;
a silica particle on a surface of the toner particle, the silica particle having a number-average particle diameter of 15 to 40 nm, an average pore diameter of 7.0 to 15.0 nm and a total pore volume of 0.40 to 1.20 cm3/g; and
the toner particle surface has an area formed by a polyester resin and an area formed by a styrene-acrylic resin, the area formed by the polyester resin on the toner particle surface being provided by exposing part of the polyester resin contained in the core particle, wherein
a total surface area of the area formed by the styrene-acrylic resin and the area formed by the polyester resin is at least 95 area % relative to a total surface area of the toner particle, and
the surface area formed by the styrene-acrylic resin is 45 to 75 area % relative to the total surface area formed by the styrene-acrylic resin and the polyester resin.