US 12,314,003 B2
Electrostatic image developing toner and electrostatic image developer
Daisuke Noguchi, Kanagawa (JP); Yoshimasa Fujihara, Kanagawa (JP); Atsushi Sugawara, Kanagawa (JP); Shintaro Anno, Kanagawa (JP); and Satoshi Miura, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Oct. 29, 2021, as Appl. No. 17/514,497.
Claims priority of application No. 2021-087878 (JP), filed on May 25, 2021.
Prior Publication US 2022/0382178 A1, Dec. 1, 2022
Int. Cl. G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/09 (2006.01)
CPC G03G 9/08728 (2013.01) [G03G 9/0823 (2013.01); G03G 9/08782 (2013.01); G03G 9/09 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electrostatic image developing toner comprising a toner particle including:
a binder resin;
a colorant;
an alkali metal; and
an alkaline-earth metal,
wherein a net intensity NS of sulfur included in the toner particle and a total net intensity NA of the alkali metal and the alkaline-earth metal included in the toner particle, the net intensity NS and the net intensity NA being measured by X-ray fluorescence analysis, satisfy 1.0<NS/NA<22.0,
the net intensity NS of sulfur is 3.5 kcps or more and 5.5 kcps or less, and
the net intensity NS of sulfur and a net intensity NM of Mg included in the toner particle, the net intensity NM being measured by X-ray fluorescence analysis, satisfy 15.0<NS/NM<22.0.