TONER
To provide a toner that prevents the occurrence of scratches on a drum while preventing regulation failure and fogging even in a situation where acceleration and long life of an image forming apparatus are required.SOLUTION: A toner contains toner particles and an external additive. The external add...
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Sprache: | eng ; jpn |
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Zusammenfassung: | To provide a toner that prevents the occurrence of scratches on a drum while preventing regulation failure and fogging even in a situation where acceleration and long life of an image forming apparatus are required.SOLUTION: A toner contains toner particles and an external additive. The external additive contains strontium titanate fine particles and alumina fine particles; the number average particle diameter of primary particles of the strontium titanate fine particles is 10 nm or more and 60 nm or less; the number average particle diameter of primary particles of the alumina fine particles is 200 nm or more and 800 nm or less; the ratio of the number average particle diameter of the primary particles of the alumina fine particles to the number average particle diameter of the primary particles of the strontium titanate fine particles, (the number average particle diameter of the primary particles of the alumina fine particles)/(the number average particle diameter of the primary particles of the strontium titanate fine particles) is 7.0 or more and 25.0 or less.SELECTED DRAWING: None
【課題】高速化、長寿命化に対しても規制不良、カブリを抑制しつつ、ドラム傷の発生しないトナーを提供すること。【解決手段】トナー粒子および外添剤を含有するトナーであって、該外添剤はチタン酸ストロンチウム微粒子及びアルミナ微粒子を含有し、該チタン酸ストロンチウム微粒子の一次粒子の個数平均粒径が10nm以上60nm以下であり、該アルミナ微粒子の一次粒子の個数平均粒径が200nm以上800nm以下であり、該チタン酸ストロンチウム微粒子の一次粒子の個数平均粒径と、該アルミナ微粒子の一次粒子の個数平均粒径の比(アルミナ微粒子の一次粒子の個数平均粒径)/(チタン酸ストロンチウム微粒子の一次粒子の個数平均粒径)が7.0以上25.0以下であることを特徴とする。【選択図】なし |
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