| 摘要 |
PURPOSE:To obtain a toner depending on triboelectricity, superior in fluidity, and enhanced in functional performance by forming a coat layer made of a mixture of a polymer and a magnetic powder or a colorant on the surfaces of spherical core particles composed of the polymer, the magnetic powder, etc.. CONSTITUTION:Substantially spherical core particles made of the polymer and a magnetic powder or a colorant, and the magnetic powder or the colorant are uniformly dispersed into a disperse system of fine polymer particles, an they are spray dried at the glass transition point of the fine polymer particles or higher to form the first coat layer 2 made of the mixture of the polymer and the magnetic powder or a colorant on the surface of each core particle 1 to obtain an electrostatic charge image developing toner. Said spherical core particles are made of a mixture of a transparent thermoplastic resin, such as acrylate or polystyrene, and the magnetic powder or a colorant, and they are granulated by spray drying or the like to 1-20mum particle diameter. |
