| 摘要 |
PURPOSE:To obtain a positively chargeable toner for dry development having stability to a change in environmental conditions, causing no fog during development, and capable of forming a high quality image by adding a specified piperazinium compound as a charge controlling substance. CONSTITUTION:A piperazinium compound represented by formula I [where Ar is a (substituted) aromatic hydrocarbon group or a (substituted) aromatic heterocyclic group; each of R1 and R<2> is H, (substituted) alkyl or (substituted) aryl; and X<-> is an anion], e.g., a compound represented by formula II is used. A binder (A) such as styrene resin or polyester resin and a coloring agent (B) such as carbon black or aniline blue are blended with said piperazinium compound (C) by about 0.1-10wt% of the amount of the binder to obtain a toner. A magnetic toner may be obtd. by further blending powder of a magnetic body. |
