Black magnetic toner using a black-color composite magnetic particles and magnetic black toner for black composite magnetic particles

摘要

PROBLEM TO BE SOLVED: To provide black magnetic particle powder for a black magnetic toner having excellent dispersibility to a binder resin and excellent fluidity and blackness. SOLUTION: Black multiple magnetic particle powder is formed by applying polysiloxane on the particle surface of magnetic iron oxide particle powder and sticking carbon black at least on a part of the polysiloxane coating and has 0.06-1.0 μm average particle diameter. In the black multiple magnetic particle powder for black magnetic toner, the sticking quantity of the carbon black is 1-25 pts.wt. per 100 pts.wt. magnetic iron oxide particle powder.