US 12,455,514 B2
Electrostatic image developing toner, electrostatic image developer, and toner cartridge
Atsushi Sugawara, Kanagawa (JP); Yoshimasa Fujihara, Kanagawa (JP); Shintaro Anno, Kanagawa (JP); Satoshi Miura, Kanagawa (JP); and Daisuke Noguchi, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Oct. 27, 2021, as Appl. No. 17/512,178.
Claims priority of application No. 2021-087877 (JP), filed on May 25, 2021.
Prior Publication US 2022/0390865 A1, Dec. 8, 2022
Int. Cl. G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/097 (2006.01)
CPC G03G 9/0819 (2013.01) [G03G 9/0825 (2013.01); G03G 9/0827 (2013.01); G03G 9/087 (2013.01); G03G 9/08755 (2013.01); G03G 9/08782 (2013.01); G03G 9/08788 (2013.01); G03G 9/09733 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An electrostatic image developing toner comprising a toner particle including:
a binder resin; and
a release agent,
wherein a cross section of the toner particle satisfies a condition (A1) below,
Condition (A1): the toner particle includes one or more domains of the release agent, the one or more domains having a diameter equal to 8% or more and 30% or less of a maximum diameter of the toner particle, the one or more domains having a geometric center at a depth of R/2 or less below a surface of the toner particle, where R represents a distance between a geometric center of the toner particle and the surface of the toner particle, the one or more domains being entirely included in an inside portion of the toner particle, the inside portion extending below a depth of 50 nm from the surface of the toner particle, and
wherein the release agent has a melting temperature of 65° C. or more and 75° C. or less.