TONER
To provide a toner that is excellent in stability of density and prevention of fogging under a high-temperature and high-humidity environment, and prevents the occurrence of damage to a drum and an adverse effect on an image due to filming on a developing roller under a low-temperature and low-humid...
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Format: | Patent |
Sprache: | eng ; jpn |
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Zusammenfassung: | To provide a toner that is excellent in stability of density and prevention of fogging under a high-temperature and high-humidity environment, and prevents the occurrence of damage to a drum and an adverse effect on an image due to filming on a developing roller under a low-temperature and low-humidity environment, even in an image forming apparatus designed for high speed and long life.SOLUTION: A toner includes toner particles containing a binder resin and a colorant, and composite particles in which alumina fine particles and silica fine particles are aggregated. The average projection area of the composite particles in the toner is 0.10 μmor more and 0.50 μmor less; the average projection area ratio ((Si)/(Si)+(Al)) of an aluminum element and a silica element in a mapping image in fluorescent X-ray measurement of the composite particles is 0.08 or more and 0.50 or less; the mode diameter of the alumina fine particles measured by a disc centrifugal sedimentation light transmission method is 250 nm or more and 800 nm or less; the number average particle diameter of primary particles of the silica fine particles is 5 nm or more and 100 nm or less.SELECTED DRAWING: None
【課題】高速化、長寿命化に対応した画像形成装置においても、高温高湿環境下における濃度の安定性やカブリの抑制に優れ、低温低湿環境下におけるドラム傷や現像ローラーフィルミングによる画像弊害の起こらないトナーを提供すること。【解決手段】結着樹脂、着色剤を含有するトナー粒子と、アルミナ微粒子とシリカ微粒子が凝集した複合粒子を含有するトナーであり、該トナーにおける該複合粒子の平均投影面積が0.10μm2以上0.50μm2以下であり、該複合粒子の蛍光X線測定におけるマッピング画像のアルミ元素とシリカ元素の平均投影面積比〔(Si)/(Si)+(Al)〕が0.08以上0.50以下であり、該アルミナ微粒子のディスク遠心沈降光透過法により測定されるモード径が、250nm以上800nm以下であり、該シリカ微粒子の一次粒子の個数平均粒径が5nm以上100nm以下であることを特徴とする。【選択図】なし |
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