Patent ID: 8088933

Claim:
A charge control agent comprising: a specific type of metal complexes represented by the following chemical formula (1) or chemical formula (2): in formula (1), R 1 represents an hydroxyl group or an hydrogen atom; R 2 and R 3 independently represent a substituted or unsubstituted alkyl group with 1-12 carbon atoms, an alkenyl with 2-12 carbon atoms, an alkoxy group with 1-12 carbon atoms, a substituted or unsubstituted aryl group with 6-12 carbon atoms, a nitryl group, an amidogen group, an halogen atom, or an hydrogen atom; R 4 represents an hydrogen atom, a potassium atom, or a sodium atom; M represents a metal atom ranges from divalent to tetravalent, A is a cation, and m is an integer from 1 to 6; in formula (2), R 1 represents an hydroxyl group or an hydrogen atom; R 2 and R 3 independently represent substituted or unsubstituted alkyls with 1-12 carbon atoms, an alkenyl with 2-12 carbon atoms, an alkoxy group with 1-12 carbon atoms, a substituted or unsubstituted aryl group with 6-12 carbon atoms, a nitryl group, an amidogen group, an halogen atom, or an hydrogen atom; R 4 represents an hydrogen atom, a potassium atom or a sodium atom; R 5 and R 6 independently represent a hydroxyl group, a water molecule, or a halogen atom; M represents a metal atom ranges from divalent to tetravalent, A is a cation, and m is an integer from 1 to 6.