| 摘要 |
PURPOSE:To obtain a sharp image with which fogging is substantially suppressed by incorporating ferrite having specific magnetic characteristics into a titled toner. CONSTITUTION:This toner contains a binder resin and ferrite and the magnetization sigma(10kOe) in 10kOe magnetic field of the ferrite is 200>sigma(10kOe)>90emu/g. The ratio of the magnetization sigma(1kOe) in the 1kOe magnetic field and sigma(10kOe) is 1/2>{sigma(1kOe)/sigma(10kOe)}<1. More specifically, the ferrite is magnetized strongly to the specified extent even in the relatively weak magnetic field (1kOe magnetic field); in addition, the difference between the magnetization in the 1kOe magnetic field and the magnetization in the extremely strong magnetic field (10kOe) is relatively small. The ferrite having such ratio within the specific range is incorporated into the toner. The sharp image which is free from fogging and has a high image density is thereby obtd. |
