| 摘要 |
PURPOSE:To maintain the characteristics of high image quality and long life and to prevent ground fogging by sticking a specific carbon black onto the surface of toner particles. CONSTITUTION:This developer consists of a toner formed by sticking the carbon black having pH2.5 to 6 to the surfaces of the toner particles at 0.1 to 1% by the weight of the toner and a carrier. A method for using a general mixer, such as V-type mixer, is applied as the means for sticking the carbon black in the state of sprinkling the carbon black to the toner particle surface. On the other hand, a surface modifying device or the like for powder to stick fine powder onto the surface of the core material by mechanical impact force is applicable as the means for sticking the carbon in a fixed state to the toner surface. The sticking of the toner onto the surface of a developing sleeve is prevented in this way without impairing the electrostatic chargeability of the toner particles. The long life is consequently obtd. and the ground fogging is decreased. |
