| 摘要 |
PURPOSE:To provide toner for faithful development to a latent image by including magnetic material subjected to hydrophobical surface treatment and treatment of enhancing bulk density. CONSTITUTION:Magnetic material comprising metal oxide of which magnetization in magnetic field 1koe is 10-40emu/g and Feret's diameter horizontal is 0.05-0.55mum is included,and to the surface of this magnetic material hydrophobic treatment is applied, and also treatment of increasing bulk density is applied thereto. By using such magnetic material, dispersion of magnetic material to bonding resin becomes uniform sufficiently, thereby uniformalize the brush height, shape and density of the toner particles. It is thus possible to attain faithful development to documents and signals. |
