| 摘要 |
PURPOSE:To obtain a titled compsn. which has high electric resistivity, is excellent in developability, transferrability, impact resistance, moisture resistance and fluidity, and is uniform without having variance by incorporating a specific binder resin and magnetic material as an essential component. CONSTITUTION:A raw material monomer of a binder resin (e.g.; styrene) and a monomer that can bind chemically with the surface of a magnetic material (e.g.; vinyl trichlorosilane) are copolymerized to obtain a binder resin. Such binder resin and 50-75wt% a magnetic magerial having >=40emu/g saturation magnetization and 0.01-5mu average grain size (e.g.; iron powder) are melted, kneaded and pulverized to obtain a toner. The toner is compounded with a conductivity control agent, chargeability control agent, coloring agent, plasticizer, etc. according to need. The magnetic toner compsn. which does not wear the surface of a photoreceptor, etc. and has good conveyability, cleanability and fixability is thus obtd. |
