| 摘要 |
<p>PURPOSE: To obtain an electrophotographic toner not causing the problem of preservability and fixable at a low temp. by melting a crystalline material having a specified m.p., a bonding resin and a colorant by heating, kneading them and heat-treating the resultant kneaded material. CONSTITUTION: At least a bonding resin and a colorant are added to a crystalline material having 50-90 deg.C m.p., they are melted by heating and kneaded and the resultant kneaded material is heat-treated, pulverized and classified. The amt. of the crystalline material is preferably 3-30 pts.wt. per 100 pts.wt. of the bonding resin and the crystalline material is preferably hardened oil obtd. by hydrogenating triglyceride-based oil, natural wax or ester wax synthesized from fatty acid and alcohol. The objective toner having satisfactory preservability, not causing trouble such as blocking in practical use and fixable at a low temp. is obtd.</p> |
