| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily attain uniform dispersion of the constituent materials of a toner, to impart necessary characteristics to separate toner particles and to simplify production by working the constituent materials in the form of a film whose thickness is almost equal to the average particle diameter of the toner and comminuting the resultant filmlike formed body. SOLUTION: The constituent materials of a toner such as a binder resin, a magnetic powder and an electric charge controlling agent are diluted and dispersed in a solvent in an appropriate ratio. The surface of a substrate such as a polyethylene terephthalate substrate is coated with the prepared dispersion by dip coating or other method in the form of a film whose thickness A is almost equal to the average particle diameter of the toner. After coating and drying, resultant filmlike formed body 1 is converted into particles by comminution and classification. An additive is then added and post-treatment such as rounding is carried out to obtain the objective toner. The toner is easily made uniform in particle diameter and powdering is very easy because the filmlike formed body 1 is a thin film.</p> |
