| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide negatively charged toner which is applied to a contactless development system, does not give rise to a fading phenomenon, is constant in electrostatic chargeability in an initial period or after lasting, is less fluctuated in image density, and can suppress the occurrence of positively charged toners and an image forming device. <P>SOLUTION: The negatively charged toner applied to the contactless development system consist of toner mother particles and externally added particles, in which the externally added particles consist of silicon dioxide particles and the aluminum oxide - silicon dioxide multi component oxide particles obtained by an in-flame hydrolysis process and the rate of liberation of the externally added particles containing aluminum atoms measured by a particle analyzer process is above 1.0 number %. <P>COPYRIGHT: (C)2003,JPO</p> |
