| 摘要 |
<p>PURPOSE:To make the electrostatic charge distribution of a toner sharp and to improve the electrostatic charge characteristics of the toner by incorporating a metal complex compd. having specified charge controlling characteristics into the toner. CONSTITUTION:A compd. expressed by formula I is incorporated into the toner. In the formula I, A1 is a hydrogen atom, halogen atom, or alkyl group, R1-R4 are hydrogen atoms or alkyl groups, M is a bivalent metal such as beryllium, calcium, zinc, barium, copper, etc. The compd. of formula I is a Schiff base metal complex to which a substd. or unsubstd. amiono group is introduced and it acts as a positive charge controlling agent. This compd. has good solubility with a binder resin, and the obtd. toner has high specific charge amt. and good stability for a long time. Thus, the toner can give clear image for electrostatic recording even when it is stored for a long time.</p> |
