ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC DEVICE

• Main Authors: HIROTA MASANORI, SATO TAICHI, HIGUCHI TAKASHI, ISHIDA TOMOHITO, NISHIDA TAKESHI, WATANABE TOSHITARO, TANAKA KENTARO
• Format: Patent
• Language: English; Japanese
• Published: 02.05.2024
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide an electrophotographic photoreceptor that achieves good transferability.SOLUTION: An electrophotographic photoreceptor has a surface layer containing a binder resin and particles. The particle is an organic-inorganic composite particle, and the organic-inorganic composite particle has a resin particle and inorganic fine particles present partially embedded in the resin particle. Small projections A derived from the inorganic fine particles are present on the surface of the organic-inorganic composite particle. Large projections derived from the organic-inorganic composite particle are present on the surface of the surface layer, and the height of the large projections is 70 nm or more and 250 nm or less. Small projections B derived from the small projections A are present on the surface of the large projection, and the radius of curvature of the small projections B is 10 nm or more and 30 nm or less.SELECTED DRAWING: None 【課題】良好な転写性を実現する電子写真感光体の提供である。【解決手段】結着樹脂と粒子を含有する表面層を有する電子写真感光体であって、該粒子が有機無機複合粒子であり、該有機無機複合粒子が樹脂粒子と、該樹脂粒子に部分的に埋め込まれた状態で存在する無機微粒子とを有し、該有機無機複合粒子の表面には該無機微粒子に由来する小凸部Ａが存在し、該表面層の表面には該有機無機複合粒子に由来する大凸部が存在し該大凸部の高さが、７０ｎｍ以上２５０ｎｍ以下であり、該大凸部の表面には、該小凸部Ａに由来する小凸部Ｂが存在し、該小凸部Ｂの曲率半径が、１０ｎｍ以上３０ｎｍ以下であることを特徴とする電子写真感光体。【選択図】なし