| 摘要 |
PURPOSE:To stably form good images having high resolution by using a developer contg. a toner into which a specified polyester resin is incorporated as a binder resin. CONSTITUTION:The images are developed by the developer contg. a toner into which the polyester resin obtd. by bringing a monomer compsn. contg. aliphat. diol, arom. dicarboxylic acid and tervalent or higher valency polyol into polycondensation reaction is incorporated as the binder resin. The flexbility of the branch chain in the polyester resin is improved in such a manner and the impact energy of the case in which a magnetic brush rubs the surface of an org. photosensitive layer is released. Since the rubbing force is thereby controlled small, the stable formation of the good images having the high resolution over many times is attained. |
