TONER

• Main Authors: KOMATSU NOZOMI, HASHIMOTO TAKESHI, HAMA MASAYUKI, SUGANO ICHIRO, FUJIKAWA HIROYUKI, ONOZAKI YUTO
• Format: Patent
• Language: English; Japanese
• Published: 24.06.2019
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide a toner which has less change in flowability and maintains high transferability.MEANS FOR SOLVING THE PROBLEM: A toner has toner particles containing a binder resin and inorganic fine particles, in which average circularity of the toner particles is 0.980 or less, when inorganic fine particles of 80 nm or more present on the toner particles having a shape coefficient SF-2 of the primary particles is 116 or less are defined as an inorganic fine particle group, a content of the inorganic fine particle group is 0.5 pts.mass or more and 30.0 pts.mass or less with respect to 100 pts.mass of the toner particles, in particle size distribution in volume reference of the inorganic fine particle group on the toner particles, when a particle size whose a cumulative value from a small particle side is 16 vol.% is represented by D16, a particle size whose a cumulative value is 50 vol.% is represented by D50, and a particle size whose a cumulative value is 84 vol.% is represented by D84, D50 is 130 nm or more and 700 nm or less, and a particle size distribution index represented by D84/D16 is 1.70 or more and 5.00 or less.SELECTED DRAWING: None 【課題】流動性の変化が少なく、高い転写性が維持されるトナーを提供する。【課題手段】結着樹脂を含有するトナー粒子、および、無機微粒子を有するトナーであって、該トナー粒子の平均円形度が０．９８０以下であり、該トナー粒子上に存在する８０ｎｍ以上、且つ、一次粒子の形状係数ＳＦ−２が１１６以下の無機微粒子を無機微粒子群としたとき、該無機微粒子群の含有量は、トナー粒子１００質量部に対して０．５質量部以上３０．０質量部以下であり、該トナー粒子上の該無機微粒子群の体積基準での粒度分布において、小粒子側からの累積値が１６体積％となる粒径をＤ１６とし、累積値が５０体積％となる粒径をＤ５０とし、累積値が８４体積％となる粒径をＤ８４としたとき、Ｄ５０が１３０ｎｍ以上７００ｎｍ以下であり、Ｄ８４／Ｄ１６で表わされる粒度分布指標が、１．７０以上５．００以下である。【選択図】なし