Hodogaya Chemical Co., Ltd.

Noriyuki Suzuki

Hideyuki Otsuka

Shinji Otani

Mitsutoshi Anzai

Masaki Okubo

Kazuo Nemoto

Eisuke Yamada

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

A method for producing a charge controlling agent comprisinig a reaction product of an aromatic hydroxycarboxylic acid and a calcium compound bonded by at least one bondinig system selected from the group consisting of coordinate bonding, covalent bonding and ionic bonding, characterized in that the aromatic hydroxycarboxylic acid and the calcium compound are reacted by dropwise adding a solution of the aromatic hydroxycarboxylic acid to a solution of the calcium compound as a metal-imparting agent, a charge controlling agent produced by said method, which has a shape coefficient (SF-1) average value of at most 250 and a shape coefficient (SF-2) average value of at most 200, and an electrostatic image developing toner containing said charge controlling agent having a presence ratio on a toner surface of at least 2.0 mg/1 g of toner.

Charge controlling agent, method for producing the same and toner for developing electrostatic image

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Fukushima, Japan

Noriyuki Suzuki