| 摘要 |
PROBLEM TO BE SOLVED: To provide toner configured to improve low-temperature fixability, heat-resistant preservability, and transfer stability, while preventing filming of silica.SOLUTION: Toner is formed by depositing first silica particle and second silica particle on a surface of a base particle. The first silica particle has an average primary particle diameter of 75-250nm. The second silica particle has an average primary particle diameter of 10-50nm. A mass ratio of the first silica particle with respect to the base particle is 0.010-0.040. A mass ratio of the second silica particle with respect to the base particle is 0.005-0.030. An isolation rate of the silica particle by means of an ultrasonic vibration method is 5-20 percent by mass. The silica particle isolated by the ultrasonic vibration method contains a particle having a particle diameter of 30nm or less at 20 percent by number. |
