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AssigneeFuji Xerox Co., Ltd.
InventorsTakashi Imai, Satoshi Inoue, Masanori Ichimura, Yutaka Sugizaki, Susumu Saito, Masaru Miura, Michio Take, Yasuo Yamamoto, Koji Fukushima, Manabu Serizawa
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A surface-treated inorganic fine particle includes an inorganic fine particle, a hydrophobizing agent deposited on the surface of the inorganic fine particle and an amino group-containing coupling agent deposited on the surface of the inorganic fine particle, wherein the hydrophobizing agent and the amino group-containing coupling agent in a ratio of 1/(0.01 to 0.1) by weight are deposited on the surface of the inorganic fine particle by treating the surface of the inorganic fine particle with the hydrophobizing agent and the amino group-containing coupling agent. An electrophotographic developer contains toner particles and the surface-treated inorganic fine particles.
An electrophotographic dry developer comprising toner particles and surface-treated inorganic particles, said surface-treated inorganic particles consisting essentially of inorganic particles having an average particle size of 5-200 nm, a hydrophobizing agent selected from the group consisting of titanate coupling agent, aluminum coupling agent and zirconium aluminate coupling agent deposited on the surface of said inorganic particles and an amino group-containing coupling agent deposited on the surface of said inorganic particles, wherein 0.01-0.1 part by weight of said amino group-containing coupling agent is deposited on the surface of said inorganic particles per one part by weight of said hydrophobizing agent.
An electrophotographic dry developer comprising toner particles and surface-treated inorganic particles, said surface-treated inorganic particles consisting essentially of inorganic particles having an average particle size of 5-80 nm, a hydrophobizing agent selected from the group consisting of titanate coupling agent, aluminum coupling agent and zirconium aluminate coupling agent deposited on the surface of said inorganic particles and an amino group-containing coupling agent deposited on the surface of said inorganic particles, wherein 0.01-0.1 part by weight of said amino group-containing coupling agent is deposited on the surface of said inorganic particles per one part by weight of said hydrophobizing agent.
Dependencies are inferred from the claim text.