| 摘要 |
<p>PURPOSE:To provide a magnetic developer having high electrostatic chargeability and capable of stabilizing image density even at the time of continuous development. CONSTITUTION:In a magnetic developer 3 obtd. by mixing a magnetic toner contg. at least binding resin, magnetic powder and an electric charge controlling agent with a magnetic carrier, the content of the magnetic powder is regulated to 50-75wt.% and that of the electric charge controlling agent to 0.5-5wt.%. An electric charge controlling agent having lower volume resistivity than the above-mentioned electric charge controlling agent is further added by 0.05-1 pt.wt. per 100 pts.wt. of the magnetic toner.</p> |
