| 摘要 |
PURPOSE:To optimize electric charge quantity and to stabilize electric chargeability by forming an outside layer of a toner of a layer which contains a conductive material and does not contain a coloring agent. CONSTITUTION:An inside layer 1 of the toner does not contain an electric charge control agent and conductive material and the outside layer 2 of the toner around said layer contains the charge control agent and conductive material. The coloring agent is incorporated into the inside layer 1 but not into the outside layer 2. The electric resistance of the outside layer of the toner, therefore, decreases and the coloring agent does not contribute to the electric charge even with the toners of different colors. The charge quantity is thereby optimized and the chargeability is stabilized. |
