| 摘要 |
<p>PURPOSE:To obtain a toner having the extent of electrostatic charge almost independent of temp. and humidity by incorporating at least one kind of specified compd. as an electrostatic charge controlling agent. CONSTITUTION:This electrophotographic toner contains at least one kind of compd. represented by a formula ROR' (where R is 1-20C alkyl, unsubstd. phenyl, benzyl, unsubstd. naphthyl or naphthyl having one or more substituents and R' is methyl, benzenesulfone, o-, m- or p-toluenesulfonyl, alpha- or- naphthalenesulfone). An arom. ring such as phenyl or benzyl is more advantageous as R than alkyl from the viewpoint of anti-offsetting. This reason is considered that the introduction of the arom. ring gives a higher m.p. A resin kneaded with the compd. as an electrostatic charge controlling agent is polystyrene, a styrene-acrylic copolymer, etc. Carbon black is added as a colorant in the case of a black toner. In the case of a color toner, a colorant corresponding to the color is added.</p> |
