| 摘要 |
PURPOSE:To contrive the prevention of contamination by toner splashing, the improvement in the durability of a toner, the prevention of the degradation in developability, the decrease of fogging and the improvement in image quality by constituting the above developer of the toner contg. magnetic material particles and a resin obtd. by bringing a polymer having a carboxyl group and a polyvalent metal compd. into reaction as a binder and a carrier. CONSTITUTION:This developer has the toner contg. magnetic material particles and the resin obtd. by bringing the polymer having the carboxyl group and the polyvalent metal compd. into reaction as the binder and the carrier. The bulk density is, therefore, increased and the flowability is improved. The magnetic material particles are thus easily kneaded into the binder at the time of melting and kneading the magnetic material particles with the binder. Since the kneaded matter uniformly dispersed with the magnetic material particles is thereby formed, the toner obtd. by grinding and classifying the kneaded matter has the magnetic material particles present uniformly on the surface thereof. The generation of the reverse electrostatically charged toner is prevented and the degradation in the electrostatic charge quantity does not arise at the time of the triboelectrostatic charge with the carrier. the prevention of the contamination by the toner splashing, the improvement in the durability of the toner, the prevention of the degradation in the developability, and the decrease of the fogging and the improvement in the image quality are contrived in this way. |
