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 HOTTA YOJIRO, NISHIKAWA KOJI, TANAKA KEISUKE, FUJIMOTO MASAMI, TERAUCHI KAZUO, NAGATA RYO, FURUI TAKAAKI
Format Patent
LanguageEnglish
Japanese
Published 12.09.2019
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Abstract 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
AbstractList 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
Author FURUI TAKAAKI
NAGATA RYO
TANAKA KEISUKE
FUJIMOTO MASAMI
TERAUCHI KAZUO
HOTTA YOJIRO
NISHIKAWA KOJI
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Snippet 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...
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SubjectTerms CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
Title TONER
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