| 摘要 |
PURPOSE:To enhance fluidity in spite of small diameters, and to enable a visible image good in reproducibility and high in image quality to be formed for a long period by incorporating a fluidity enhancing agent specified in average particle diameter in a binder resin together with a fine magnetic powder. CONSTITUTION:The fluidity enhancer having an average particle diameter of 10-50mum, such as fine inorg. particles, org. dyes or pigments, is incorporated in the binder resin together with the fine magnetic powder to enhance fluidity of the carrier in spite of small diameter. Accordingly, toner concn. can be raised and its allowance can be enlarged, and high-density visible images can be obtained stably. A magnetic brush is formed delicately and softly, and sharpness and gradation of an image can be improved. When an oscillating electric field system is used, a jumping effect can be ensured and fog can be prevented. Since it is unnecessary to add a fluidity enhancer to the toner, damage of a latent image bearing body, etc., can be prevented, cleaning performance can be improved, and toner stains, etc., can be prevented. |
