| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an electrostatic charge image developing toner which prevents production of smear, offset and filming during copying and shows excellent fluidity and electrification property by internally adding inorg. fine particles having a specified average primary particle size and externally adding inorg. fine particles having a specified average particle size which are subjected to hydrophobic treatment. SOLUTION: This toner consists of at least a polyethylene wax, polypropylene wax, binder resin and coloring agent. In the toner, inorg. fine particles (A) having 0.03 to 3μm average primary particle size are internally added and inorg. fine particles (B) having 0.005 to 0.02μm average primary particle size subjected to hydrophobic treatment are externally added. As for the inorg. fine particles (A), silica fine particles, metal silicate fine particles, metal titanate fine particles, titanium dioxide (titania) fine particles, ferrite fine particles and magnetite fine particles can be used. As for the inorg. fine particles (B), same kinds of inorg. fine particles as of the inorg. fine particles (A) can be used, and particles subjected to hydrophobic treatment and having 0.005 to 0.02μm average primary particle are used.</p> |
