| 摘要 |
PURPOSE:To obtain the carrier for developing electrostatic charge images with which the initial characteristics are exhibited stably over a long period of time and which have excellent durability by forming a resin coating layer by a dry process and dispersing and incorporating a carbon fluoride into the resin coating layer. CONSTITUTION:The dry process is adopted as a coating means and the content ratio of the carbon fluoride in the resin coating layer is controlled to a specified range (0.5 to 45wt.%), by which the uniformity of the dispersion of the carbon fluoride in the resin coating layer is improved. Namely, the coating resin and the carbon fluoride exist as secondary flocs in the beginning of the stage for mixing and agitating of the core material particles and the coating material but the secondary flocs of the coating resin and the carbon fluoride are eventually disintegrated by the mechanical forces that the secondary flocs receive by the agitation in the process for forming the resin coating layer by sticking and including of these secondary flocs to and in the surface of the core material particles. The carbon fluoride is sufficiently uniformly dispersed and incorporated into the resin coating layer and the good copied images without generating the fogging are stably formed many times. |
