US 12,436,477 B2
Electrostatic image developing toner, electrostatic image developer, and toner cartridge
Atsushi Sugawara, Kanagawa (JP); Yoshimasa Fujihara, Kanagawa (JP); Daisuke Noguchi, 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. 8, 2021, as Appl. No. 17/497,144.
Claims priority of application No. 2021-087876 (JP), filed on May 25, 2021.
Prior Publication US 2022/0382176 A1, Dec. 1, 2022
Int. Cl. G03G 9/087 (2006.01); G03G 9/097 (2006.01); G03G 15/08 (2006.01)
CPC G03G 9/087 (2013.01) [G03G 9/097 (2013.01); G03G 15/0868 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An electrostatic image developing toner comprising a toner particle including:
an amorphous polyester resin;
a crystalline resin; and
a release agent, wherein when a cross section of the toner particle is observed, the toner particle satisfies conditions (A1) and (B1) below,
Condition (A1): one or more domains of the crystalline resin, the domains having a diameter equal to 10% or more and 40% or less of a maximum diameter of the toner particle, are present in the toner particle,
Condition (B1): one or more domains of the release agent, the domains having a diameter equal to 10% or more and 40% or less of the maximum diameter of the toner particle, are present in the toner particle; and
wherein a domain diameter of the crystalline resin is 1.1 μm or more and 2.0 μm or less,
wherein a proportion of the toner particles satisfying conditions (A1) and (B1) to all toner particles is 43% or more, and
wherein the release agent is an ester wax having a melting temperature of 85° C. or more and 95° C. or less or a polyethylene wax having a melting temperature of 91° C.