Nippon Kayaku Kabushiki Kaisha

Isao Yamaguchi

Yasuo Shirasaki

Takashi Miyazawa

Toru Tabei

Hiroaki Ono

Junko Yoshioka

Yoshinori Katoh

Kazunobu Nagasaki

A metal phthalocyanine compound that is useful as a black colorant suitable for use in an ink-jet recording ink, a water-based ink composition containing the metal phthalocyanine compound, and a product colored with the metal phthalocyanine compound. In particular, a metal phthalocyanine compound having, as substituents, both an acylamino group and a carboxyethylamino group on the phthalocyanine structure, or the salt thereof is used as a black colorant. Recorded images formed by the use of this colorant are excellent in light fastness and water fastness and exhibit absorption in infrared and visible regions, so that highly effective utilization can be found in printing of, for example, bar codes which are available in near-infrared ray reading.

Phthalocyanine compound, water-base ink composition and colored material

A black recording having high solubility, being stable even after being stored for long, and capable of forming a printed image with a high optical density and excellent water and light resistances. The recording fluid contains a trisazo compound of general formula (1): wherein D is an 8-hydroxy-1-naphtyl group substituted with one or two sulfo groups; A is a 1,4-phenylene group or 1,4-naphtylene group which may be substituted with amino, hydroxy, alkyl, alkoxy, acylamino or ureido; and B is a phenyl group which may be substituted with hydroxy, amino or sulfo, or a salt thereof and is used for the recording.

Water-soluble trisazo compounds, aqueous ink composition and colored article

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

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Chiba, Japan

Isao Yamaguchi