| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-magnetic one component toner with which toner thin film formation on a developing roller is maintained even in printing for a long period, an electrostatic charge quantity is stabilized, and high-quality images of high density and satisfactory uniformity free of fogging are obtained, and the fusion to a blade and selective development are prevented, and to make the toner applicable appropriately even for a recycling cartridge in which a developing roller, regulating roller, supply roller, etc., are recycled. SOLUTION: The non-magnetic one component toner is prepared by adding (A) 0.5 to 3 parts by weight inorganic oxide particles of volume resistivity 1×10<SP>5</SP>to 5×10<SP>7</SP>Ωcm and number average grain size 0.35 to 0.65μm, (B) 0.3 to 3 parts by weight hydrophobic silica of average primary particle diameter≥5 nm to <30 nm, and (C) 0.3 to 3 parts by weight hydrophobic silica of average primary particle diameter≥30 nm to <80 nm to 100 parts by weight toner base particles. COPYRIGHT: (C)2007,JPO&INPIT
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