| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide black magnetic iron oxide particle powder which is suitable to black coloring pigment for painting, resin, printing ink, etc., as it is black and which can make a toner with high image density under high-temperature high-humidity condition when used as black magnetic particles for the magnetic toner since it has high resistance in a high-voltage region, low moisture absorbing property, and excellent dispersion property. <P>SOLUTION: The average particle diameter of the black magnetic iron oxide particles is 0.05-2.0 μm, and the electric resistance value at the applied voltage of 100 V is 1×10<SP>8</SP>Ωcm or more. <P>COPYRIGHT: (C)2010,JPO&INPIT |
