US 12,455,515 B2
Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method
Sakae Takeuchi, Kanagawa (JP); Shimpei Takagi, Kanagawa (JP); Yuka Zenitani, Kanagawa (JP); Koji Sasaki, Kanagawa (JP); Yoshifumi Eri, Kanagawa (JP); and Mai Mochida, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Apr. 1, 2022, as Appl. No. 17/711,044.
Claims priority of application No. 2021-156200 (JP), filed on Sep. 24, 2021.
Prior Publication US 2023/0108365 A1, Apr. 6, 2023
Int. Cl. G03G 9/097 (2006.01); G03G 9/08 (2006.01); G03G 9/087 (2006.01)
CPC G03G 9/09725 (2013.01) [G03G 9/0819 (2013.01); G03G 9/08755 (2013.01); G03G 9/08795 (2013.01); G03G 9/08797 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An electrostatic charge image developing toner comprising:
toner particles; and
silica particles that are added to an exterior of the toner particles, contain a nitrogen element-containing compound, have a ratio C/D of 0.10 or more and 0.75 or less where C represents an integral value of signals observed in a range of chemical shift of −50 ppm or more and −75 ppm or less in a 29Si solid-state nuclear magnetic resonance spectrum obtained by a cross-polarization/magic angle spinning method and D represents an integral value of signals observed in a range of chemical shift of −90 ppm or more and −120 ppm or less in the same spectrum, have an extraction amount X of the nitrogen element-containing compound by a mixed solution of ammonia/methanol of 0.1% by mass or more, and satisfy Expression: Y/X<0.3 where X represents an extraction amount of the nitrogen element-containing compound by a mixed solution of ammonia/methanol and Y represents an extraction amount of the nitrogen element-containing compound by water,
wherein the silica particles have silica base particles and a structure that covers at least a part of a surface of the silica base particles and is configured with a reaction product of a trifunctional silane coupling agent, and in which the nitrogen element-containing compound is adsorbed onto some of pores of the reaction product of the trifunctional silane coupling agent.