| 摘要 |
PURPOSE:To prevent sticking of a toner to a sleeve by using a binder resin and coloring agent as the essential component of the toner and further incorporating conductive zinc oxide in the form of superfine powder having an average primary grain size and specific volume resistivity of respectively specific values or below into the toner. CONSTITUTION:The toner consists essentially of the binder resin and the color ing agent and further, the conductive zinc oxide in the form of the superfine powder having <=80mmu average primary grain size and <=8,000OMEGAcm specific volume resistivity is incorporated into the toner. The sticking of the toner to the sleeve cannot be prevented and the damage of the surface of a photosensi tive body and the white speck phenomenon of an image are generated if the average primary grain size of the conductive zinc oxide is larger than 80mmu. The sticking of the toner to the sleeve cannot be prevented if the specific vol ume resistivity is larger than 8,000OMEGAcm. The average primary grain size and the specific volume resistivity are, therefore, confined to the above-mentioned ranges, by which the desorption of the toner from the toner particle surface is decreased and the sticking of the toner to the sleeve is prevented. |
