Electrophotographic toner
AssigneeKyocera Mita Corporation
InventorKeiichi Tanida
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Abstract
The electrophotographic toner of the present invention comprises toner particles containing at least a binder resin, wax, a charge control agent and a pigment, and at least titanium oxide externally added to the toner particles as an external additive. The titanium oxide has an aspect ratio of 2 to 5 and a Mohs hardness of not less than 6. It is preferable that the titanium oxide is a compound oxide doped with a metal of the group V of the periodic table and is anatase-type. The electrophotographic toner is especially preferably used for an image forming apparatus having amorphous silicon photoreceptors.
Claims11
An electrophotographic toner, comprising toner particles containing at least a binder resin, wax, a charge control agent and a pigment, and at least titanium oxide externally added to the toner particles as an external additive,
- wherein the titanium oxide has an aspect ratio of 2 to 5 and a Mohs hardness of not less than 6.
An electrophotographic toner, comprising toner particles containing at least a binder resin, wax, a charge control agent and a pigment, and at least titanium oxide externally added to the toner particles as an external additive,
- wherein anatase-type titanium oxide having an aspect ratio of 2 to 5 and a Mohs hardness of not less than 6 is prepared by preparing a peroxotitanic acid solution using titanium powder, adding a metal of the group V of the periodic table as a doping metal to the solution, then obtaining peroxo-modified anatase sol through hydrothermal treatment at 80 to 100° C. for 7 to 15 hours and drying the sol.
Dependencies are inferred from the claim text.