| abstract |
The negatively chargeable toner of the present invention includes a boron compound expressed by the chemical structural formula (A): <IMAGE> (A) wherein R1 and R3 respectively represent substituted or non-substituted aryl group, R2 and R4 respectively represent hydrogen atom, alkyl group, substituted or non-substituted aryl group, X represents a cation, and n is an integer of either 1 or 2; to improve charge rise characteristics and charging stability. |