| 摘要 |
Toner composition comprising toner particles and external additive is provided to give improved dispersion property between particles and excellent cleaning ability between photo-conductor and electric charger by fabricating the additive with silica, titanium oxide, magnesium stearate and polymethylmethacrylate. The toner composition includes: toner particles containing coloring agent, coupling agent, charge control agent and releasing agent; and external additive which comprises 0.2-8wt.% of silica, 0.1-3.0wt.% of titanium oxide, 0.1-1.0wt.% of magnesium stearate and 0.1-1.0wt.% of polymethylmethacrylate resin, based on total 100wt.% of the toner particles. Titanium oxide is surface-treated by alumina and organo-polysiloxane and has BET surface area ranging from 20 to 100m^2/g. The releasing agent is wax with melting point ranging from 70 to 120deg.C.
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