| 摘要 |
PROBLEM TO BE SOLVED: To provide a toner whose electrification is effectively improved while securing the flowability of the toner by considering the sticking state of an additive agent to mother particles. SOLUTION: In a toner T, the mother particles 18 include at least two kinds of additive agent 19 having a different specific resistance (Ωcm) as the additive agent 19. The additive agent isolation ratio of the free additive agent 19' isolated from the mother particles 18 among the additive agent 19 having a smaller specific resistance is set larger than that of the free additive agent 19' isolated from the mother particles 18 among the additive agent 19 having a larger specific resistance. Besides, the additive agent isolation ratio of the additive agent having the smaller specific resistance is set to be≤10%. Thus the electrification of the toner is more effectively improved while securing the flowability of the toner. COPYRIGHT: (C)2004,JPO |
