WATER-SOLUBLE AZO COMPOUND, SALT THEREOF, INK COMPOSITION, AND COLORED BODY

摘要

The purpose of the present invention is to provide: a water-soluble yellow pigment (compound) exerting high water solubility and coloring properties, and exhibiting excellent color saturation on recorded images; and a yellow ink composition for various recordings, particularly inkjet recording, the yellow ink composition containing the aforementioned yellow pigment (compound). A water-soluble azo compound represented by formula (1) or a salt of the water-soluble azo compound is used to obtain an ink composition exerting high coloring properties, various fastness properties for recorded products, and storage stability of recorded images, and having the color saturation and hue appropriate for inkjet recording. In formula (1), x represents an integer between 2 and 4, and group (A) represents an amino group represented by one of the formulae from among formula (2) to formula (6). In formula (2), y represents an integer between 1 and 5. In formula (3), w represents an integer between 2 and 6. In formula (4), m represents 1 or 2. In formula (5), n represents an integer between 0 and 2, and Z represents a hydrogen atom, a carboxy group, or a sulfo group. In formula (6), R represents a hydrogen atom or a sulfo group.