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AssigneeRicoh Company, Ltd.
InventorsHideki Sugiura, Satoshi Mochizuki, Yasuaki Iwamoto, Kazuhiko Umemura
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An external additives for electrophtographic toner comprising finely divided oxide particulate including a silicon compound and a compound for doping said oxide particulate, wherein particle diameter of the primary particle of said finely divided oxide particulate is in the range of 30 nm to 150 nm, and the primary particle of said finely divided oxide particles is substantially spherical shape having the roundness in the range of 0.95 to 0.996, is provided. And this external additives is capable of evading from the embedding of external additives into toner even if after the toner is held in the storage under the condition of high temperature and high humidity, thereby the additives is capable of showing sufficient functions as fluidizing agent and charge supplement agent, and is capable of inhibiting an abnormal charge elevation even after being stored under the low temperature and low humidity.
An external additives for electrophtographic toner comprising finely divided oxide particulate including a silicon compound and a compound for doping said oxide particulate, wherein particle diameter of the primary particle of said finely divided oxide particulate is in the range of 30 nm to 150 nm, and the primary particle of said finely divided oxide particles is substantially spherical shape having the roundness in the range of 0.95 to 0.996.
An electrophtographic toner having a volumetric average particle diameter in the range of 2 μm to 10 μm, and comprising at least a binder resin and a colorant, and the toner comprises an external additives for electrophtographic toner comprising finely divided oxide particles including a silicon compound and a compound for doping said oxide particles, wherein particle diameter of the primary particle of said finely divided oxide particles is in the range of 30 nm to 150 nm, and the primary particle of said finely divided oxide particles is substantially spherical shape having the roundness in the range of 0.95 to 0.996.
An electrophotographic developer of two-component comprising an electrophotographic toner and a carrier of magnetic particles, said electrophtographic toner having a volumetric average particle diameter in the range of 2 μm to 10 μm, and comprising at least a binder resin and a colorant, and the toner comprises an external additives for electrophotographic toner comprising finely divided oxide particulate including a silicon compound and a compound for doping said oxide particulate, wherein particle diameter of the primary particle of said finely divided oxide particulate is in the range of 30 nm to 150 nm, and the primary particle of said finely divided oxide particulate is substantially spherical shape having the roundness in the range of 0.95 to 0.996.
An image forming apparatus loaded by a container filled with an electrophotographic toner, said electrophtographic toner having a volumetric average particle diameter in the range of 2 μm to 10 μm, and comprising at least a binder resin and a colorant, and the toner comprises an external additives for electrophtographic toner comprising finely divided oxide particulate including a silicon compound and a compound for doping said oxide particulate, wherein particle diameter of the primary particle of said finely divided oxide particulate is in the range of 30 nm to 150 nm, and the primary particle of said finely divided oxide particulate is substantially spherical shape having the roundness in the range of 0.95 to 0.996.
Dependencies are inferred from the claim text.