NEGATIVE CHARGE CONTROLLING AGENT AND STATIC CHARGE IMAGE DEVELOPING TONER USING THE SAME, AND METHOD FOR PRODUCING THE SAME

摘要

A negative charge controlling agent which comprises a polycondensation product formed by the polycondensation of a phenol and an aldehyde, wherein the phenol comprises a mononuclear phenol compound having one phenolic hydroxyl group and hydrogen atoms bonded to the ortho-position to the hydroxyl group and a polynuclear phenol compound having two or more phenolic hydroxyl groups and hydrogen atoms bonded to the ortho- position to the hydroxyl groups, and wherein the polynuclear phenol compound accounts for 1 to 30 mol % of the phenol.