| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a dye compound for black ink having high solubility to a medium containing water as a main component, being stable even in the case of storing in the form of a high-concentration aqueous solution or ink for a long term, giving a printed image having very high density, free from bronzing trouble of even an image printed with a high-concentration solution and giving a black recorded image having high fastness, especially light resistance and ozone resistance of the printed image, and to provide an ink composition of the black dye compound. <P>SOLUTION: The invention provides a trisazo compound expressed by formula (1) or its salt. In formula, n is 0 or 1, the group A is a substituted 2-naphthothiazolyl group etc., the group B is a substituted phenyl group etc., R<SP>1</SP>is a carboxy group etc., and R<SP>2</SP>to R<SP>4</SP>are each independently a hydrogen atom, an unsubstituted 1-4C alkyl group, a substituted 1-4C alkoxy group etc. <P>COPYRIGHT: (C)2010,JPO&INPIT |
