Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo

Ueno Fine Chemicals Industry, Ltd.

Nobuhiro Yonetani

Hiroyuki Wakamori

Masaya Kitayama

Ryuzo Ueno

Kenji Minami

The present invention provides a method for producing a naphthalenecarboxylic acid amide compound represented by formula [1] comprising, reacting a naphthalenecarboxylic acid halide compound represented by formula [2] with ammonium acetate in a solvent having an ether bond.  According to the method of the present invention, a naphthalene carboxylic acid amide compound can be obtained at high yield and at low cost.

Method for producing naphthalene carboxylic acid amide compound

The present invention provides a novel naphthol derivative represented by the following general formula (I). The novel naphthol derivative of the present invention is useful as a positively electrifiable charge control agent. The present invention further provides an electrophotographic toner comprising a charge control agent comprising the novel naphthol derivative represented by formula (I).

Naphthol derivative and charge control agent comprising the same

The present invention provides a safe charge control agent which exhibits an excellent negative chargeability and excellent dispersibility in and compatibility with binder resins, and is even applicable for col or toners. Specifically, the charge control agent consists of a naphthol derivative of formula [I]: and a salt thereof, and an electrophotographic toner comprising the agent are provided.

Charge controllers

The present invention provides an alkylenebisnaphthol derivative represented by formula [I]: and a salt thereof. The compound of the present invention has an excellent triboelectric charge property and useful as charge control agent for electrophotographic toners.

Alkylenebisnaphtol derivative and charge control agent which consists of the same

Disclosed is a method for preparing a 2-hydroxy-6-ureidocarbonyl naphthalene derivative. The method comprises the step of reacting 2-hydroxy-6-aminocarbonyl naphthalene and a isocyanate in an organic solvent at a temperature of 90&#x2013;200&#xb0; C. According to the present invention, 2-hydroxy-6-ureidocarbonyl naphthalene derivative can easily be obtained within relatively short time and high yield.

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Nishinomiya, Japan

Nobuhiro Yonetani