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

• Main Authors: MATSUMOTO AKIRA, ISHIHARA YUKA, IKEDA MASAFUMI
• Format: Patent
• Language: English; Japanese
• Published: 06.12.2022
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide an electrostatic charge image development toner capable of preventing adhesion thereof to a fixing member when an image with low image density is formed.SOLUTION: An electrostatic charge image development toner provided herein comprises toner particles, each comprising a core containing a binder resin and a mold release agent having a melting temperature Tm of 80°C or less and a coating layer covering the core and containing an amorphous polyester resin. A cross-sectional observation of a toner particle shows the presence of one or more and three or less domains of the mold release agent with a circle-equivalent diameter of 1-3 μm, inclusive, in the core. The toner particles have a volume-average particle diameter in a range of 4.2-5.8 μm, inclusive. A cross-sectional observation of the toner particle shows that a ratio of a thickness of the coating layer to the maximum diameter of the toner particle is 1-25%, inclusive.SELECTED DRAWING: None 【課題】低画像密度の画像を形成した場合の定着部材へのトナーの付着を抑制できる静電荷像現像用トナーの提供。【解決手段】結着樹脂、及び融解温度Ｔｍが８０℃以下の離型剤を含む芯部と、前記芯部を被覆し、非晶性ポリエステル樹脂を含有する被覆層と、で構成されるトナー粒子を有し、前記トナー粒子の断面を観察したとき、前記芯部に円相当径１μｍ以上３μｍ以下の前記離型剤のドメインが１個以上３個以下存在し、前記トナー粒子の体積平均粒径が４．２μｍ以上５．８μｍ以下であり、前記トナー粒子の断面を観察したとき、前記トナー粒子の最大径に対する前記被覆層の厚さの比率が、１％以上２５％以下である静電荷像現像用トナー。【選択図】なし