TONER
To provide a toner with which a high-definition quality image can be formed even immediately after a fresh toner is supplied to a developing device.SOLUTION: A toner includes toner particles containing a binder resin and inorganic fine particles A on the surface of each of the toner particles. The i...
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Sprache: | eng ; jpn |
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Zusammenfassung: | To provide a toner with which a high-definition quality image can be formed even immediately after a fresh toner is supplied to a developing device.SOLUTION: A toner includes toner particles containing a binder resin and inorganic fine particles A on the surface of each of the toner particles. The inorganic fine particles A are at least one fine particle selected from the group consisting of titanate alkaline earth metal fine particles and zirconate alkaline earth metal fine particles. When X(%) is the coverage of the surface of the toner particle by the inorganic fine particles A in the toner having a particle diameter equal to or more than the median diameter (D50) on the number basis of the toner, and Y(%) is the coverage of the surface of the toner particle by the inorganic fine particles A in the toner having a particle size of less than the D50, X and Y satisfy the relationships represented by the following formulas (1), (2), and (3). (1) 0.10≤Y/X≤0.90; (2) 5.0≤X≤30.0; (3) 0.5≤Y≤10.0.SELECTED DRAWING: None
【課題】フレッシュなトナーが現像装置に供給された直後においても、高精細画質の画像形成を行えるトナーを提供する。【解決手段】結着樹脂を含有するトナー粒子および該トナー粒子の表面上の無機微粒子Aを含有するトナーであって、該無機微粒子Aがチタン酸アルカリ土類金属微粒子およびジルコン酸アルカリ土類金属微粒子からなる群より選択される少なくとも1種の微粒子であり、前記トナーの個数基準におけるメジアン径(D50)以上の粒径のトナーにおける該無機微粒子Aによる該トナー粒子の表面被覆率をX(%)とし、前記D50未満の粒径のトナーにおける該無機微粒子Aによる該トナー粒子の表面被覆率をY(%)としたとき、XおよびYが、下記式(1)、(2)および(3)で示される関係を満たすことを特徴とする。0.10≦Y/X≦0.90 (1)5.0≦X≦30.0 (2)0.5≦Y≦10.0 (3)【選択図】なし |
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