| 摘要 |
<p>A developer for developing electrostatic latent images, comprising at least magnetic particles, colored resin particles and a fluidity improver; said magnetic particles having a weight-average particle size of 35 - 65 mu m, and a weight-basis distribution such that they contain 1 - 20 wt. % of magnetic particles having a particle size of not less than 26 mu m and below 35 mu m, 5 - 20 wt. % of magnetic particles having a particle size of 35 - 43 mu m, and 2 wt. % or less of magnetic particles having a particle size of 74 mu m or above; said colored resin particles having a volume-average particle size of 4 - 10 mu m and a volume-basis distribution such that they contain 1 % or less of particles having a particle size of 20.2 mu m or above; said fluidity improver having a charging characteristic satisfying the following conditions: 0.5 </= ¦B/A¦ </= 2, and 15 </= ¦A¦ </= 100, wherein A denotes the triboelectric charge amount of the fluidity improver when mixed with said magnetic particles reciprocally 60 times, and B denotes that of the fluidity improver when mixed with said magnetic particles reciprocally 30,000 times. <IMAGE></p> |
