| 摘要 |
PURPOSE:To obtain a negatively chargeable toner ensuring a sharp distribution of the amt. of electric charges by using polyester resin as resin for fixing and incorporating an electric charge controlling aid incompatible with the resin for fixing but dispersible in the resin and having action in reverse polarity to an electric charge controlling agent for negative charging. CONSTITUTION:Polyester resin is used as resin for fixing and an electric charge controlling aid incompatible with the resin for fixing but dispersible in the resin and having electric charge controlling action in reverse polarity to an electric charge controlling agent for negative charging is incorporated into a toner. Since such a positive charge controlling substance is combined with the electric charge controlling agent for negative charging, the distribution of the amt. of electric charges on the toner can be made sharp. A negatively chargeable toner hardly giving a highly charged toner not used for development and a slightly charged toner causing scattering can be obtd. |
