Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo

Kanzaki Paper Manufacturing Co., Ltd.

Ueno Fine Chemicals Industry, Ltd.

Sugai Chemical Industry Co., Ltd.

Kenji Minami

Ryuzo Ueno

Masaya Kitayama

Hiroyuki Wakamori

Nobuhiro Yonetani

Shigeru Ito

Masaharu Kittaka

Katsunori Tanikawa

Mitsuru Kondo

Toshitake Suzuki

Teijiro Kitao

Masayuki Omatsu

Hironori Fujii

Naoko Mori

Mariko Tanigawa

Hikari Hirai

Masamitsu Kubotsu

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

The present invention provides a method for preparing dimer of a monohydroxy aromatic compound. In the method of the present invention, oxidative coupling reaction of a monohydroxy aromatic compound represented by formula [I]:Ar&#x2014;OH&#x2003;&#x2003;[I]

Process for production of dimers or aromatic monohydroxyl compounds

The present invention provides a binaphthol compound represented by formula [1]:and a salt thereof. The binaphthol compound of the present invention is useful for manufacturing antiseptic compounds or chiral catalysts. According to the method of the present invention, binaphthol compounds can be prepared in high yield with low cost.

Binaphthol derivative and process for producing the same

Metal salt of binaphthol derivative and method for preparing the same

A toning agent for an azo pigment, an azo pigment with a modified tone, and process for preparing the same are provide. 2-hydroxynaphthalene-3,6-dicarboxylic acid or a derivative thereof is admixed with a primary coupler component for an azo pigment and the mixed coupler composition and an aromatic diazonium are coupled.

Toning agent

Naphthol derivatives

AZO compounds and process for producing the same

A novel compound represented by the general formula (1)

Compounds

A naphthol derivative represented by the general formula (I), &lsqb;wherein Y and Y&prime; indicate &mdash;(CONH),&mdash;X or &mdash;COR; X is a phenyl group, a naphthyl group, an anthraquinonyl group, a benzimidazolonyl group or a carbazolyl group; R is a hydroxyl group, an alkoxy group having 1 to 6 carbon atoms, a halogen atom, a benzyloxy group, a phenyloxy group or a phenacyloxy group; R,is a hydrogen atom, an alkaline metal, an alkyl group having 1 to 6 carbon atoms, an acyl group having 1 to 6 carbon atoms or a phenylalkyl group; Z is a group selected from the group consisting of a hydrogen atom, a halogen atom, a nitro group, a nitroso group and an amino group (Z may be substituted on any ring of the naphthalene ring); and n is an integer of 1 or 2; provided that R,and Z do not simultaneously indicate a hydrogen atom when both R simultaneously indicate a hydroxyl group&rsqb;, and a process for producing the same. This naphthol derivative can be used as raw materials for synthesis, such as dyes, pigments, photosensitive materials and the like.

Naphthol derivatives and process for producing the same

Novel water-soluble azo compounds useful as raw materials for preparing dyes excellent in dyeing properties and fastness and prepared from a coupler consisting of 2-hydroxynaphthalene-3,6-dicarboxylic acid or an ester thereof or an amide derivative of the same and a diazonium compound having a group of the general formula: &mdash;B&mdash;(CH,),- Q or &mdash;B&prime;&mdash;(CH,),-Q&prime; (wherein B and B&prime; are each an electron-attracting group; and Q and Q&prime; are each a group capable of forming a vinyl group through the elimination with an alkali, provided the groups Q and Q&prime; are each bonded at the &bgr;-position of the ethyl group).

Water-soluble azo compounds and process for the preparation thereof

Naphtol derivative and process for producing the same

Bis(aminocarbonylnaphthol) derivative

Water-soluble azo compounds and process for producing the same

Growing community of inventors

Sennan, Japan

Kenji Minami