| 摘要 |
Provided is a charge control agent that gives toner a practical level of negative chargeability, is colorless or a light color and can be used in a color toner, has an electrostatic charge from charging of a resin powder, such as the toner used, that is stable against environmental change, and has the characteristics of: excellent temporal stability of charge control characteristics, i.e., storage stability; excellent stability of charge control characteristics when repeatedly used a number of times, i.e., durability; and high stability without containing toxic heavy metals. The charge control agent comprises a phenol multimeric mixture containing a plurality of phenol multimeric types indicated by the following chemical formula (1) (wherein R1 and R2 are hydrogen atoms or alkyl groups, A is a 4-chlorophenol ring-containing group indicated by the following chemical formula (2) or the following chemical formula (3) (wherein R3 and R4 are hydrogen atoms or alkyl groups and m is an integer between 0 and 2), and x is an integer between 16 and 28 in the chemical formula (2) and a number in the range indicated by (14-2m)/(m+2) to (26-2m)/(m+2) in the chemical formula (3)). |
