TONER

• Main Authors: HOTTA YOJIRO, FUJIMOTO MASAMI, MIZUGUCHI TAKUYA, ITO SHINGO, TERAUCHI KAZUO, INOUE YASUKAZU, TOMINAGA HIDEYOSHI, MASUMOTO AKANE, YAMAMOTO KOSUKE, SHIOZAWA MOTOHIDE, NAKA TAKESHI
• Format: Patent
• Language: English; Japanese
• Published: 10.08.2017
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To provide a toner which stabilizes charging properties, has good cleaning properties, and hardly causes development streaks.SOLUTION: There is provided a toner which contains toner base particles containing a binder resin and a coloring agent, and toner particles containing resin particles fixed to the surface of the toner base particles, and inorganic fine particles A, where the surface of the toner particles has a projection derived from the resin particles, an average length (D) of a long side of the projection is 50 nm or more and 300 nm or less, an average height (H) of the projection is 25 nm or more and 250 nm or less, a relationship between the long side and the height of the projection satisfies expression (1): 0.50D≤H≤0.80D, the inorganic fine particles A have an average value of a density of 0.40 or more and 0.80 or less, and the toner has an amount of the inorganic fine particles A to be bonded of 0.1 area% or more and 5.0 area% or less. Expression (2) is density=area of inorganic fine particles/area of region surrounded by envelope curve of inorganic fine particles.SELECTED DRAWING: None 【課題】帯電性が安定し、良好なクリーニング性を有し、且つ現像スジを引き起こしにくいトナー。【解決手段】結着樹脂、及び着色剤を含有するトナー母粒子、並びに該トナー母粒子の表面に固着した樹脂粒子を含むトナー粒子と、無機微粒子Ａと、を含有するトナーであって、該トナー粒子の表面は、該樹脂粒子に由来する凸部を有し、凸部の長辺の平均長さ（Ｄ）が５０ｎｍ以上３００ｎｍ以下であり、凸部の平均高さ（Ｈ）が２５ｎｍ以上２５０ｎｍ以下であり、該凸部の長辺と高さの関係が下記式（１）を満たし、該無機微粒子Ａは、稠密度の平均値が、０．４０以上０．８０以下であり、該トナーは、無機微粒子Ａの付着量が、０．１面積％以上５．０面積％以下であることを特徴とするトナー。０．５０Ｄ≦Ｈ≦０．８０Ｄ 式（１）稠密度＝無機微粒子の面積／無機微粒子の包絡線により囲まれた領域の面積 式（２）【選択図】なし