Hodogaya Chemical Co., Ltd.

Eisuke Yamada

Hideyuki Otsuka

Masaki Okubo

Kazuo Nemoto

Masami Ito

Shinji Otani

Noriyuki Suzuki

The present invention is to provide a charge controlling agent and negatively chargeable toner that do not contain any toxic metal, are essentially free from the risk of evoking ignition or explosion, and can exhibit a high charge amount and rapid initial increase in charging. The charge controlling agent is a mono azo iron complex compound represented by Formula (1): wherein J represents H, alkali metal, ammonium, or alkyl ammonium, or two or more of those elements in combination.

Mono azo iron complex compound, and charge controlling agent and toner using the same

An electrophotographic printing method which comprises using a charge controlling agent containing a monoazo iron complex compound of the formula (1) as an effective component, wherein A, A, Band Bare respectively independently H, an alkyl group or a halogen atom, J is H, an alkali metal, NHor an alkylammonium, they may be two or more kinds, Xand Xare respectively independently H, an alkyl group or a halogen atom, and Yand Yare respectively independently H, an alkyl group or an aromatic group which may have a substituent, provided that a case in which A, A, B, B, X, X, Y, and Yare hydrogen at the same time is excluded.

Electrophotographic printing method, monoazo iron complex compound, charge controlling agent using the same and toner using the charge controlling agent

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Koriyama, Japan

Eisuke Yamada