| 摘要 |
PURPOSE:To improve cleanability and to prevent melting or filming of a toner to the surface of a photosensitive body by mixing >=2 kinds of resins which have the peak values of the mol.wt. distribution within the same range, are nearly the same in the form of the mol.wt. distribution and are different in acid value as a binder resin. CONSTITUTION:A coloring agent is dispersed in the mixture composed of the resin which has respectively >=1 peak values of the low mol.wt. distribution in 1X10<3>-5X10<4>-5X10<7> ranges and has <=13 acid value and the resin which has respectively >=1 peak values of the mol.wt. distribution in the same ranges as the above-mentioned ranges and has >=30 acid value. The charge of the toner remaining and sticking on the photosensitive body in a developing stage is, therefore, rapidly attenuated in the cleaning stage and the Coulomb force of the electrostatic latent image and the toner at the time of the cleaning is reduced. |
