US 12,228,883 B2
Toner for developing electrostatic charge image and electrostatic charge image developer
Daisuke Ishizuka, Kanagawa (JP); and Shinya Sakamoto, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Oct. 4, 2021, as Appl. No. 17/493,267.
Claims priority of application No. 2021-087873 (JP), filed on May 25, 2021.
Prior Publication US 2022/0390868 A1, Dec. 8, 2022
Int. Cl. G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/09 (2006.01); G03G 15/08 (2006.01)
CPC G03G 9/08755 (2013.01) [G03G 9/0821 (2013.01); G03G 9/091 (2013.01); G03G 15/08 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A toner for developing an electrostatic charge image, the toner comprising:
toner particles that contain an amorphous polyester resin and a crystalline polyester resin, wherein:
a ratio Qs1/Qf1 is 1.1 or more and 2.0 or less, where Qf1 is a total area of all endothermic peaks detected during a first temperature rise when the toner particles are analyzed by differential scanning calorimetry after one-day storage under 50° C. conditions; and
Qs1 is a total area of all endothermic peaks detected during a first temperature rise when classified toner particles are analyzed by differential scanning calorimetry after one-day storage under 50° C. conditions, the classified toner particles being a fraction of the toner particles in which toner particles having a diameter equal to or larger than a volume-average diameter D50v of the toner particles constitute 10% by number or less.