| 摘要 |
<p>PROBLEM TO BE SOLVED: To ensure good electrostatic charge buildup property and good stability of a charged state by incorporating a bonding resin, a magnetic material and a specified electric charge controlling agent and providing a specified saturation magnetization and a specified coercive field strength. SOLUTION: The electrophotographic toner contains as bonding resin, a magnetic material and an electric charge controlling agent of the formula and has 2-50 Am2/kg saturation magnetization and 40-200 Oe coercive field strength. In the formula, R1 is quaternary carbon, methine or methylene and may contain, N, S, O or P as a heteroatom, Y is a cyclic structure bonded by a saturated or unsaturated bond, R2 and R3 are each alkyl, alkenyl, alkoxy, aryl, aryloxy, aralkyl, aralkoxy or the like, R4 is H or alkyl, (l) is 0 or an integer of 1-12, (m) is an integer of 1-20, (n) is 0 or an integer of 1-20, (o) is 0 or an integer of 1-4, (p) is 0 or an integer of 1-4, (q) is 0 or an integer of 1-3, (r) is an integer of 1-20 and (s) is 0 or an integer of 1-20.</p> |
