US 12,461,462 B2
White toner, electrostatic charge image developer, and toner cartridge
Asafumi Fujita, Kanagawa (JP); Teppei Yawada, Kanagawa (JP); Kotaro Yoshihara, Kanagawa (JP); and Tsuyoshi Murakami, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Jan. 28, 2022, as Appl. No. 17/586,796.
Claims priority of application No. 2021-153561 (JP), filed on Sep. 21, 2021.
Prior Publication US 2023/0091296 A1, Mar. 23, 2023
Int. Cl. G03G 9/087 (2006.01); G03G 9/08 (2006.01); G03G 9/097 (2006.01); G03G 15/01 (2006.01); G03G 15/08 (2006.01)
CPC G03G 9/08788 (2013.01) [G03G 9/0821 (2013.01); G03G 9/09708 (2013.01); G03G 15/0126 (2013.01); G03G 15/0865 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A white toner comprising:
a toner particle that contains a binder resin containing a hybrid resin in which an amorphous resin unit and a crystalline polyester resin unit are chemically bonded to each other, surface-treated titanium oxide, and a release agent,
wherein a proportion of Al atoms in a surface of the surface-treated titanium oxide is 3 atomic % or greater and 20 atomic % or less, and a proportion of Ti atoms in the surface is 5 atomic % or greater and 15 atomic % or less,
wherein a ratio (Al/Ti) of an atomic weight of Al to an atomic weight of Ti in the surface of the surface-treated titanium oxide is 1.5 or greater and 4.0 or less.