公开(公告)号：US20250147442A1

公开(公告)日：2025-05-08

申请号：US18837233

申请日：2023-02-13

Applicant: ZEON CORPORATION

Inventor： Kojiro Akazaki ,  Kohei Yamada

IPC: G03G9/087 ,  G03G9/08 ,  G03G9/097

Abstract: A toner comprising colored resin particles containing a binder resin, a colorant, a softening agent and a charge control agent, and an external additive, wherein the toner has a specific viscoelasticity; a conditioned bulk density obtained by use of a powder flowability analyzing device is 0.527 g/mL to 0.550 g/mL; and a flowability is 80% or more. Also, a toner comprising colored resin particles containing a binder resin, a colorant, a softening agent and a charge control agent, and an external additive containing fatty acid metal salt particles, wherein the toner has a specific viscoelasticity, and the ratio of a blow-off charge amount after a stirring time of 1800 seconds to a blow-off charge amount after a stirring time of 180 seconds, which are measured by a specific charge amount measurement method, is 0.50 to 1.00.