MAGNETIC TONER

PROBLEM TO BE SOLVED: To provide a magnetic toner in which good fluidity of the magnetic toner in a developing unit can be maintained even after the formation of a large number of images.SOLUTION: There is provided a magnetic toner that has specific fluidity and has an external additive added theret...

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Main Authors HOTTA YOJIRO, NISHIKAWA KOJI, FUJIMOTO MASAMI, YAMAZAKI KATSUHISA, NOMURA SHOTARO, TSUDA SHOHEI, ITAKURA TAKAYUKI
Format Patent
LanguageEnglish
Japanese
Published 12.03.2015
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To provide a magnetic toner in which good fluidity of the magnetic toner in a developing unit can be maintained even after the formation of a large number of images.SOLUTION: There is provided a magnetic toner that has specific fluidity and has an external additive added thereto, which has (1) a number average particle diameter of 70 nm or more and 200 nm or less, (2) a shape factor SF-1 of 100 or more and 250 or less, and (3) a shape factor SF-2 of 105 or more and 250 or less, where a coverage of the surface of toner particles with silica is 40.0% or more and 70.0% or less. 【課題】 多数枚の画像形成後であっても、現像器内における磁性トナーの流動性を良好に保つことができる磁性トナーを提供する。【解決手段】 １）個数平均粒径が７０ｎｍ以上２００ｎｍ以下であり、２）形状係数ＳＦ−１が１００以上２５０以下であり、３）形状係数ＳＦ−２が１０５以上２５０以下である外添剤が添加されたトナーであって、トナー粒子の表面のシリカによる被覆率が４０．０％以上７０．０％以下であり、特定の流動性を有することを特徴とする磁性トナーである。【選択図】 なし
Bibliography:Application Number: JP20140157083