| 摘要 |
PURPOSE:To improve fluidity and electrostatic chargeability by mixing fine polymethyl methacrylate particles, fine titanium oxide particles, fine silica particles, and fine silica particles treated with a quternary ammonium salt with a positively chargeable toner containing a specified charge enhancing agent. CONSTITUTION:The fine polymethyl methacrylate particles, the fine titanium oxide particles surface coated with a mixture of the oxide of tin-antimony, the fine silica particles subjected to hydrophobicness enhancing treatment, and the fine silica particles treated with the quternary ammonium salt are added to the positively chargeable toner composed of a resin, a colorant treated with metal carboxylate having a melting point of 70-250 deg.C to add it in the surface, and the charge enhancing agent represented by formula I in which each of R1 and R2 is H atom, alkyl, phenyl, or alkylphenyl group, and R3 is H atom, hydroxy group, or the like, thus permitting a high-quality image to be obtained. |
