| 摘要 |
PURPOSE:To obtain the nonmagnetic one-component developer having excellent flowability and developability by specifying the amt. of the hydrophobic silica to be added to a toner and the circumferential speed of the agitating vanes of a high-speed flow type mixer and sticking the hydrophobic silica in a partially flocculated state onto the toner surface. CONSTITUTION:The hydrophobic silica is added at 0.5 to 2.0wt.% to the toner and is treated for 1 to 10 seconds by means of the high-speed flow type mixer and by rotating the agitating vanes thereof at 30 to 80m/sec circumferential speed, by which the nonmagnetic one-component developer sticking to the toner surface in the partially flocculated state is obtd. The hydrophobic silica sticks weakly and nonuniformly in the partially flocculated state to the toner surface of this developer and, therefore, the electrostatic force is lowered by increasing the distance between the toner particles and the contact points are decreased. The flowability is improved in this way and the mirror image power with a carrier is lowered. The splashing to electrostatic latent images is improved and the developability is enhanced. |
