ELECTROSTATIC CHARGE IMAGE DEVELOPMENT TONER, ELECTROSTATIC CHARGE IMAGE DEVELOPER, TONER CARTRIDGE, PROCESS CARTRIDGE, IMAGE FORMING DEVICE, AND IMAGE FORMING METHOD

• Main Authors: TAZAKI MONA, TORII YASUKO, SAITO YUTAKA, KAKEHI SOTARO, YAMAGISHI YUKA, TAKAHASHI SAKON, IGUCHI MOEKI
• Format: Patent
• Language: English; Japanese
• Published: 24.09.2020
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide an electrostatic charge image development toner which prevents occurrence of fixing offset.SOLUTION: An electrostatic charge image development toner is provided, comprising toner particles containing a mold release agent and having exposed portions with exposed mold release agent on surfaces thereof, and sol-gel silica particles externally added to the toner particles. The exposed portions have an average diameter A in a range of 200 to 600 nm, inclusive. The sol-gel silica particles have an average primary particle diameter in a range of 20 to 90 nm, inclusive, and exhibits a mass loss rate in a range of 1 to 10 mass%, inclusive, when heated from 30°C to 250°C at a heating rate of 30°C/min. A ratio A/B of the average diameter A to the average primary particle diameter B is in a range of 3 to 30, inclusive.SELECTED DRAWING: None 【課題】定着オフセットの発生を抑制する静電荷像現像用トナーを提供する。【解決手段】離型剤を含有し、表面に前記離型剤が露出した露出部を有するトナー粒子と、前記トナー粒子に外添されたゾルゲルシリカ粒子と、を含み、前記露出部の平均径Ａが２００ｎｍ以上６００ｎｍ以下であり、前記ゾルゲルシリカ粒子は、平均一次粒径Ｂが２０ｎｍ以上９０ｎｍ以下であり、且つ、昇温速度３０℃／分で３０℃から２５０℃まで加熱したときの質量減少割合が１質量％以上１０質量％以下であり、前記平均径Ａと前記平均一次粒径Ｂとの比Ａ／Ｂが３以上３０以下である、静電荷像現像用トナー。【選択図】なし