| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a nonmagnetic one-component developer with excellent durability in which the surface state of the toner is hardly changed and toner characteristics can be maintained even when the developer is used for repeated copying. SOLUTION: This nonmagnetic one-component developer contains toner particles having 4 to 10μm volume average particle size (D) containing at least a binder resin and a coloring agent, first inorg. fine particles having 1 to 40 nm primary average particle size, second inorg. fine particles having 40 to 100 average primary particle size larger by >=10 nm than that of the first inorg. fine particles, and third inorg. fine particles having 100 nm to 1000D/16 nm average primary particle size and larger by >=10 nm than that of the second inorg. fine particles. The proportion of the first and second inorg. fine particles are controlled to 0.1 to 2 wt.% and 0.1 to 2.5 wt.%, respectively of the toner particles, with 0.8 to 3 wt.% of the sum to the toner particles. The proportion of the third inorg. fine particles is 0.3 to 3 wt.% of the toner particles.</p> |
