| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an electrostatic charge image developing toner which shows a high transfer rate, gives a small amt. of waste toner, provides a stable picture quality for a long time, and does not require a complicated device or structure for the image forming device to be used, by externally adding specified two different kinds of fine particles comprising fine particles or aggregates of fine particles having a smaller average particle size than that of the toner. SOLUTION: This electrostatic charge image developing toner contains two different kinds of fine particles A, B externally added. These fine particles consist of particles or aggregates of particles having a smaller average particle size than the particle size of the toner and satisfy the relation of SA>=120, SB<=110,|QA|<|Q1|<|QB|, wherein SA, SB are sphericity of the fine particles A, B, respectively, QA, QB are charge amts. of the toner when fine particles A, B are externally added to the toner, Q1 is the charge amt. of the toner before the fine particles A, B are externally added. The sphericity S is defined by S=π×(MXLNG)<2> }/ 4×(AREA)}×100, wherein MXLING and AREA are the absolute max. length and projected area of particles, respectively.</p> |
