Toner

To provide a toner that has good transfer stability even when a transfer condition is changed and has a high image density even when the toner is used for a long period.SOLUTION: A toner contains toner particles and an external additive. The external additive includes strontium titanate particles, a...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Terauchi, Kazuo, Hotta, Yojiro, Furui, Takaaki, Nishikawa, Koji, Nagata, Ryo, Tanaka, Keisuke, Fujimoto, Masami
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:To provide a toner that has good transfer stability even when a transfer condition is changed and has a high image density even when the toner is used for a long period.SOLUTION: A toner contains toner particles and an external additive. The external additive includes strontium titanate particles, and in a projection image of the strontium titanate particles photographed by using a scanning electron microscope, when the standard deviation of the distance from the center of gravity of the projection image to the contour of the projection image is Ds, and the equivalent circle diameter of the projection image is Da, a value CV calculated with the formula (1) is 0.07 or less.SELECTED DRAWING: None