Charge controlling agent for electrostatic image development, and toner and charge-imparting material employing it

摘要

A charge controlling agent for electrostatic image development, which is a compound of the formula (I):Ar1-(X-Ar2)n(I)wherein each of Ar1 and Ar2 is a substituted or unsubstituted aromatic ring residue, X is a member selected from the group consisting of -CONH-, -NHCO-, -SO2NH- and -NHSO2-, and n is an integer of at least 2, provided that a plurality of Ar2, or a plurality of X, are the same or different groups from one another, and toner and charge-imparting material employing the charge controlling agent.