Sumitomo Chemical Company, Limited

Taoka Chemical Company, Limited

Mituhiro Ohta

Kazuya Ogino

Hideo Kawashita

Naoki Harada

Yutaka Kayane

Kingo Akahori

Herein is provided a trisazo compound represented by formula (I) in the free acid form: ##STR1## wherein Q.sub.1 is an unsubstituted or substituted phenylene or naphthylene group, Q.sub.2 is an unsubstituted or substituted phenyl or naphthyl group, Z is --SO.sub.2 CH.sub.2 CH.sub.2 OH or --SO.sub.2 CH.sub.2 CH.sub.2 SO.sub.3 H group, and L is 0 or 1. The trisazo compound provided herein is excellent in solubility and gives deep colored dyed product or image when used in dyeing or printing, so that it is useful as a dye and an ink. Herein are also provided a method for dyeing fiber materials, paper or leather by using said trisazo compound, and an ink containing said trisazo compound.

Trisazo compounds, method for dyeing fiber materials, paper or leather

An ink composition for ink jet recording, which contains a water-soluble dye, an organic solvent and water, in which the dye is represented by the formula (1) as shown in the state of free acid:

Ink compositions for ink jet recording

A disazo compound of the formula (I) in the free acid form, ##STR1## and an ink jet recording ink composition containing the same are provided, and the composition is superior in stability during storage or use, heat resistance, image clearness, water resistance and light fastness, and has a desirable tint as a red color.

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Osaka, Japan

Mituhiro Ohta