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...
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Main Authors | , , , , , , |
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Format | Patent |
Language | English Japanese |
Published |
12.09.2019
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Subjects | |
Online Access | Get full text |
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Summary: | 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
【課題】 転写条件が変化した場合でも転写安定性が良好であり、さらに長期使用した場合においても、画像濃度が高いトナーを提供する。【解決手段】 トナー粒子と、外添剤と、を含有するトナーであって、外添剤は、チタン酸ストロンチウム粒子を含有し、走査型電子顕微鏡を用いた撮影したチタン酸ストロンチウム粒子の投影像において、投影像の重心から投影像の輪郭までの距離の標準偏差をDs、投影像の円相当径をDaとしたとき、式(1)で算出される値CVが0.07以下であることを特徴とする。【選択図】 なし |
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Bibliography: | Application Number: JP20180036772 |