| 摘要 |
PROBLEM TO BE SOLVED: To provide a toner for the development of an electrostatic charge image giving a stable image density, capable of suppressing fog, and excellent also in dot reproducibility not only in the initial stage of printing but in plate wear printing, particularly in a high image quality and high speed developing device having a resolution of≥1,200 dpi, and to provide a method for preparing the toner. SOLUTION: The toner for the development of an electrostatic charge image is prepared by a process including the processes of: (I) melt-kneading a raw material containing a binder resin, a releasing agent and a colorant, cooling the melt-kneaded material, and pulverizing the cooled material; and (II) further pulverizing a pulverized product obtained in the process (I) in the presence of an external additive containing a negatively chargeable inorganic oxide subjected to hydrophobic treatment and a positively chargeable inorganic oxide subjected to hydrophobic treatment, and classifying the pulverized product. The method for preparing the toner is also provided. COPYRIGHT: (C)2006,JPO&NCIPI
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