| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve flowability of a magnetic toner and to always obtain good image density even when lots of images are continuously formed in a direct recording device by specifying the material, particle size and amt. of a flowability improving agent to be externally added to the toner particles which constitute the magnetic toner. SOLUTION: A matrix-type recording electrode 3 having lots of small holes is disposed between a toner carrier 1 and a back electrode 2. A toner is sprayed from the toner carrier 1 to the recording body 4 between the recording electrode 3 and the back electrode 2 according to the voltage applied on the recording electrode 3. The magnetic toner to be used for this direct recording device is produced by externally adding a flowability improving agent to toner particles containing 20-60wt.% magnetic powder in a binder resin. The amt. of the flowability improving agent is 0.1-2 pts.wt. to 100 pts.wt. of the toner particles and the particle size of the agent is specified to 0.005-1.0μm. As for the flowability improving agent, one of SiO2 , TiO2 , Al2 O3 , etc., can be used.</p> |
