| 摘要 |
PURPOSE:To enable the formation of images having a high resolution, high image quality and high density by constituting the above developer of a toner formed of a toner consisting of colored particles formed by granulation and polymn. and a carrier having a specific flowability improving agent and a fluorine polymer-contg. layer. CONSTITUTION:The positive-chargeable toner consisting of the colored particles which are obtd. by allowing at least polymerizable monomers and coloring agents to coexist in an aq. medium and granulating and polymerizing the mixture and have 2 to 8mum average grain size is combined with the negative chargeable toner which has a resin coating layer consisting of the highly water- repellent fluorine polymer subjected to a hydrophobing treatment with a silane coupling agent on the surface and added with a negative chargeable flowability improving agent, such as colloidal silica, and has 20 to 80mum average grain size. The good triboelectristatic chargeability of the toner is stably exhibited over a long period of time in this way. The images having the excellent durability, the high resolution and high image quality as well as the high density are thus stably obtd. |
