JP2969720B

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 the quaternary ammonium salt and imidazole deriv. expressed by specific constitutional formula. CONSTITUTION:The quaternary ammonium salt is the salt making compd. of the quaternary ammonium salt as expressed by general formula I and naphthol sulfonic acid. In the formula, R denotes 1 to 8C alkyl group; R , R respectively denote 1 to 18C alkyl group; R denotes 1 to 8C alkyl group or benzyl group. On the other hand, the imidazole deriv. is the compd. expressed by general formula II. In the formula, R , R and R respectively denote a hydrogen atom, 1 to 20C alkyl group, aralkyl group or aryl group. The quaternary ammonium and imidazole deriv., when used in combination, are particularly excellent as a positive static electricity control agent.