| 摘要 |
PURPOSE:To enhance fixability, antitack property, and offset resistance of a toner by raising hardness and softening point the surface film of a toner, lowering those of the inside core, and incorporating a releasing component in the inside core but not in the surface film. CONSTITUTION:The encapsulated toner (a) to be used is composed of the inside core 34 made of a resin having a softening point of 70-160 deg.C and containing the releasing component, and the surface film 36 made of the resin having a softening point of >=130 deg.C and a weight average molecular weight more than that of the core 34, thus permitting the obtained toner to be prevent from firmly adhering to a triboelectrifying member and a toner carrying body at the time of triboelectrifying the toner by raising the hardness and the softening point of the film 36 and enhancing its antitack property, and to be enhanced in heat fixability by lowering the hardness and the softening point of the core 34, and further, prevented from melting and attaching of the toner at the time of developing and enhanced in offset resistance at the of fixing by incorporating the releasing component in the core 34 but not almost not in the film 36. |
