| 摘要 |
<p>PROBLEM TO BE SOLVED: To attain rapid build-up of electrostatic charge and to ensure an appropriate quantity of electric charges by mixing at least a polyester resin, polyethylene wax, acidic carbon black, particles containing an azo metallic compound as an electrostatic charge controlling agent and an inorganic fine powder treated with silicone oil. SOLUTION: At least a polyester resin, polyethylene wax, acidic carbon black, particles containing an azo metallic compound as an electrostatic charge controlling agent and an inorganic fine powder treated with at least silicone oil are mixed to obtain the objective nonmagnetic one-component black toner. The average particle diameter of the toner particles is 4-20μm, preferably 4-12μm. A preferred amount of the polyethylene wax is 0.1-5 pts.wt., in particular 0.05-4 pts.wt. based on 100 pts.wt. polyester resin. The number average molecular weight (Mn) of the polyhethylene wax is preferably 1,000-7,000. A core of the inorganic fine powder preferably comprises silica, titania or alumina, in particular the silica.</p> |
