| 摘要 |
PURPOSE:To provide a titled developer having extremely stable electric charge stability by incorporating a compd. having an amino group in the nitrogenous heterocyclic nucleus into highly insulating carrier liquid. CONSTITUTION:This developer contains the compd. having the amino group in the nitrogenous heterocyclic nucleus in the highly insulating carrier liquid. The compd. to be used is preferably expressed by the formula (where A denotes a carbon atom or nitrogen atom, Y denotes a bivalent group, n denotes 0 or 1, R1 and R2 denotes a hydrogen atom or org. group and Z denotes the atomic group necessary for forming the nitrogenous heterocyclic nucleus). The nitrogenous heterocyclic compd. having the amino group to be used acts as an electric charge controlling agent to apply good positive charge to toner particles and the charge stability thereof is extremely high. The charge controlling agent is preferably used at a ratio of about 0.001-0.5pts.wt. by 1,000pts. with carrier liquid. |
