| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an azo compound for black ink that has high solubility in a medium mainly composed of water, is stable even after long-term storage of a highly concentrated aqueous solution or ink thereof, is excellent in fastness of a recorded image, particularly excellent in light resistance and ozone gas resistance and gives a colorless and high-grade black recorded image and to provide an ink composition containing the compound. <P>SOLUTION: The azo compound represented by formula (1) or salts thereof is provided. In the formula, R<SP>1</SP>represents an unsubstituted alkyl group or the like; R<SP>2</SP>represents a cyano group or the like; R<SP>3</SP>and R<SP>4</SP>each independently represent a hydrogen atom, a sulfo group or the like; R<SP>5</SP>to R<SP>7</SP>each independently represent a sulfo-substituted alkoxy group or the like; the group A represents a substituted naphthyl group or the like; and the group B represents a substituted thiazole group or the like. <P>COPYRIGHT: (C)2010,JPO&INPIT |
