BLACK TONER COMPRISING COMBINATION OF COLOR PIGMENTS

摘要

Nonmagnetic one-component black toner is provided to improve antistatic property in a developer and to ensure excellent background pollution, transfer efficiency and long time stability. Nonmagnetic one-component black toner is formed by using a colorant mixture including cyanogen, magenta and yellow coloring agent in a weight ration of 2~4 : 2~4 : 1~2. The content of the colorant mixture is 4~8 weight% based on the weight of the toner mother particle. The colorant mixture further comprises the carbon black coloring agent having the primary particle diameter of 15~55nm.