Magnetic toner

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United States of America Patent

PATENT NO 9152065
APP PUB NO 20140342278A1
SERIAL NO

14364636

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A magnetic toner includes: magnetic toner particles containing a binder resin and a magnetic body; and inorganic fine particles that are present on the surface of the magnetic toner particles and are not a magnetic iron oxide and magnetic iron oxide particles that are present on the surface of the magnetic toner particles, wherein the inorganic fine particles present on the surface of the magnetic toner particles contain metal oxide fine particles, the metal oxide fine particles containing silica fine particles, and optionally containing titania fine particles and alumina fine particles, and a content of the silica fine particles being at least 85 mass % with respect to a total mass of the silica fine particles, the titania fine particles and the alumina fine particles; when a coverage ratio A (%) is a coverage ratio of the magnetic toner particles' surface by the inorganic fine particles and a coverage ratio B (%) is a coverage ratio of the magnetic toner particles' surface by the inorganic fine particles that are fixed to the magnetic toner particles' surface, the coverage ratio A and B/A satisfy prescribed ranges; and the magnetic iron oxide particles present on the magnetic toner particles' surface are from at least 0.10 mass % to not more than 5.00 mass % with respect to the total amount of the magnetic toner.

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First Claim

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Patent Owner(s)

  • CANON KABUSHIKI KAISHA

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hasegawa, Yusuke Suntou-gun, JP 120 2441
Magome, Michihisa Mishima, JP 52 1545
Ohmori, Atsuhiko Suntou-gun, JP 28 596
Sano, Tomohisa Mishima, JP 74 1158

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