| 摘要 |
PURPOSE:To obtain the toner for developing electrostatic charge images which is less deteriorated in image quality by lapse of time and is less deteriorated by environment and has excellent electrostatic charge characteristics by making combination use of a nigrosine dye and an imidazole deriv. expressed by specific constitutional formula. CONSTITUTION:Various known nigrosine dyes are usable as the nigrosine dye. On the other hand, the imidazole deriv. is the compd. expressed by general formula I. In the formula, R<1>, R<2> and R<3> respectively denote a hydrogen atom, 1 to 20C alkyl group. aralkyl group or aryl group. This toner exhibits particularly excellent properties as a positive charge control agent if the nigrosine dye and the imidazole deriv. are used in combination in such a manner. |
