| 摘要 |
PURPOSE:To improve the working environment of the production of a toner, and to obtain a toner showing stable fogging and having good splashing state of the toner and little change in the density of copied picture images in continuous copying without deteriorating the dispersibility of the coloring agent in the toner under any use environment by including a resin and a granulated coloring agent in the toner. CONSTITUTION:Any well-known resin suitable for an electrostatic charge image developing toner may be used as the resin component. Any powder coloring agent may be used for the source material of the granulated coloring agent. The powder coloring agent is compacted under such load properly determined to obtain 1.2-2.0 bulk density ratio and more preferably 1.2-1.8 bulk density ratio before and after granulating. If the bulk density ratio is <1.2, splashing of the coloring agent increases during handling the coloring agent and the bulk volume of the source material increases. This makes shearing difficult during kneading, and dispersibility of the coloring agent in the toner becomes bad to deteriorate the toner performance. If the bulk density ratio is >2.0, aggregation of the coloring agent increases and enough dispersibility is not obtd. during kneading and deteriorates the toner performance. |
