| 摘要 |
<p>PURPOSE:To maintain a good state without deterioration of electrification property and fluidity of a toner even when the deposition state of an external additive gradualy changes, by using a polyester-base negative toner consisting of polyester binder resin and a specified boron compd. as a charge control agent incorporated into the binder resin. CONSTITUTION:As for the nonmagnetic one-component toner, a polyester-base negative toner consisting of a polyester binder resin and a baron compd. expressed by formula as a charge control agent incorporated into the polyester binder resin is used. The amt. of the charge control agent is 0.5-3.0wt.%. This nonmagnetic one-component toner is obtd. by the following method. The boron compd. expressed by the formula in a specified proportion with a coloring agent is added an kneaded with a polyester resin consisting of, for example, bis-phenol A-ethylene oxide-added compd./cyclohexane dimethanol/terephthalic acid. Then the kneaded material is pulverized and classified into toner particles of 5-20mum average particle size. Then a fluidizing agent or transfer assistant is added as an external additive.</p> |
