DEVELOPING DEVICE, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS

• Main Authors: TERUI YUHEI, TSURU SEIJI, KOMATSU HIROAKI
• Format: Patent
• Language: English; Japanese
• Published: 05.08.2021
• Subjects: CHEMISTRY; CINEMATOGRAPHY; COMPOSITIONS BASED THEREON; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MAGNETOGRAPHY; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PHOTOGRAPHY; PHYSICS; THEIR PREPARATION OR CHEMICAL WORKING-UP

To provide a developing device for electrophotography that reduces an increase in fogging even in a long-time operation.SOLUTION: A developing device 10 for electrophotography is used in which a toner supply roller 1 has a conductive layer 3 including a cross-linked urethane resin formed of a reactant of an ion conductive agent having a reactive functional group reacting with an isocyanate group, polyol, and a compound having an isocyanate group, and the toner supply roller 1 has projections formed of an organic silicon polymer having a structure of R-SiO3/2, and is combined with a toner 11 in which the projections are present at a specific ratio in observation of toner by a scanning type electron microscope (STEM).SELECTED DRAWING: Figure 1 【課題】長時間稼働時においてもカブリの増加が少ない電子写真用の現像装置を提供する。【解決手段】トナー供給ローラ１が、イソシアネート基と反応する反応性官能基を有するイオン導電剤と、ポリオールと、イソシアネート基を有する化合物との反応物からなる架橋ウレタン樹脂を含む導電層３を有し、該トナー供給ローラ１に対して、Ｒ−ＳｉＯ３／２の構造を有する有機ケイ素重合体からなる凸を有しており、走査型電子顕微鏡（ＳＴＥＭ）による凸が特定の割合存在するトナー１１を組み合わせた電子写真用現像装置１０を用いる。【選択図】図１