| 摘要 |
<p>PURPOSE: To provide a full-color toner excellent in electrification stability in particular in serious consideration of endurance stability and causing no cleaning defect and no toner filming on a photoreceptor by specifying the electrification control agent quantity contained in toner grains in the range of fixed quantities for the internal layer and the internal surface layer respectively. CONSTITUTION: A resin, a colorant, and an electrification control agent are fused, crushed, and classified to obtain this toner, the electrification control agent quantity (a) is set to 3-10 pts.wt. against the toner of 100 pts.wt., and an equation a/b=2-10 is satisfied, where (b) is the electrification control agent quantity existing on the surface layer of toner grains. This toner is used in the image forming method having the cleaning process constituted of a cleaning blade made of urethane rubber with the rubber hardness of 67 deg. or above. The equation a/b=2-10 indicates the state that the electrification control agent in the toner grains is uniformly dispersed and the dispersion concentration of the electrification control agent on the internal surface layer of the toner grains is high.</p> |
