TONER

To provide a toner that has good developability and excellent cleanability even during a long-term printing in a high-speed machine.SOLUTION: A toner includes toner particles containing a binder resin and a colorant, and an external additive. The number-basis median diameter (D50) of the toner is 3....

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Bibliographische Detailangaben
Hauptverfasser: KOMATSU NOZOMI, HASHIMOTO TAKESHI, HAMA MASAYUKI, SUGANO ICHIRO, IKEDA MOE, FUJIKAWA HIROYUKI, ONOZAKI YUTO
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a toner that has good developability and excellent cleanability even during a long-term printing in a high-speed machine.SOLUTION: A toner includes toner particles containing a binder resin and a colorant, and an external additive. The number-basis median diameter (D50) of the toner is 3.0 μm or more and 6.0 μm or less. In relation to a surface height of the surface of the toner particle of the toner resulting from the external additive obtained by a scanning electron microscope (SEM), when the surface height of the toner having a particle diameter less than the median diameter (D50) is HS (nm), and the surface height of the toner having a particle diameter equal to or more than the median diameter (D50) is HL (nm), the following formulas (1) and (2) are satisfied. (1) HS≤300; (2)1.1≤HS/HL≤3.0.SELECTED DRAWING: None 【課題】本発明によれば、高速機での長期印刷時においても良好な現像性とクリーニング性に優れたトナーを提供することができる。【解決手段】結着樹脂および着色剤を含有するトナー粒子と、外添剤を有するトナーであって、前記トナーの個数基準におけるメジアン径(D50)が3.0μm以上6.0μm以下であり、前記トナーの走査型電子顕微鏡(SEM)により求められる、前記トナー粒子表面の前記外添剤による表面高さに関し、前記メジアン径(D50)未満の粒径のトナーの表面高さをHS[nm]、前記メジアン径(D50)以上の粒径のトナーの表面高さをHL[nm]、としたとき、下記式(1)及び(2)を満たすことを特徴とする。HS≦300 (1)1.1≦HS/HL≦3.0 (2)【選択図】なし