Nippon Kayaku Kabushiki Kaisha

Junko Yoshioka

Yasuo Shirasaki

Masaaki Ikeda

Masao Onishi

Hiroyuki Matsumoto

Takafumi Fujii

Junji Otani

Yasuo Murakami

Takashi Miyazawa

Katsunori Fujii

Masaharu Nomura

Tadayuki Kiyoyanagi

Toru Tabei

Shigeo Yamamura

Isao Yamaguchi

Shinichi Namba

Kitayama Hirokazu

The present invention relates to a cyan dye mixture, an ink composition containing the mixture and a method of ink-jet recording with the ink composition. The print obtained by the method is characterized by discoloring or fading little even when allowed to stand in a well ventilated shade or in an ozone gas. The cyan dye mixture comprises compounds which are obtained by chlorosulfonating, as a starting material, copper phthalocyanine or a sulfonated copper phthalocyanine and then aminating the chlorosulfonation product with an aminating agent used in an amount of at least 2.5 mol per mol of the starting material, and which are represented by the following formula (1):wherein M represents a proton, alkali metal ion, alkaline earth metal ion, onium ion of an organic amine, or ammonium ion; m is an integer of 1 to 4; and n is an integer of 0 to 3; provided that m+n is an integer of 1 to 4.

Cyan dye mixture, water-based cyan ink composition, and method of ink-jet recording

Anthrapyridone compound, aqueous magenta ink compositions and ink-jet recording method

Water-soluble disazo compounds, aqueous ink compositions, and colored

The present invention relates to a process for producing a dioxazine compound represented by the formula (1) which comprises carrying out a ring closure reaction of a compound represented by the formula (2) in the presence of a dioxazine derivative of the formula (3), colored materials containing this dioxazine compound, and dioxazine compounds having a plate-like crystal form: ##STR1##

Process for producing dioxazine compounds, colored materials therewith

The present invention relates to a process for producing a dioxazine compound represented by the formula (1) which comprises carrying out a ring closure reaction of a compound represented by the formula (2) in the presence of a dioxazine derivative of the formula (3): ##STR1##

An electrophotographic toner containing a specific compound as the charge control agent is described. The electrophotographic toner according to the present invention have a sharper distribution of the amount of electrification and better moisture resistance and time stability than those of a toner wherein a conventional charge control agent is used. Therefore it can provide an image having a very high gradation and has a very high capability of repeatedly forming an image. Since the charge control agent, as such, is essentially colorless, a colorant can freely be selected according to a hue required of a color toner and the toner is not detrimental to the hue inherent in a dye and a pigment.

Electrophotographic toner

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Yono, Japan

Junko Yoshioka