QUINOPHTHALONE COMPOUNDS AND WATER-BASED INK CONTAINING THE SAME

摘要

Quinophthalone compounds represented by formula (1); and a water-based ink containing any of the compounds which is useful as an ink-jet recording fluid excellent in light resistance and storage stability. In at least one of X1 to X9 is -Z(CH2)nSO3Y and the remainder each independently is hydrogen, halogeno, carboxy, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, -SO3Y, or -Z(CH2)nSO3Y; Z is oxygen or sulfur; n is 1 to 4; and Y is hydrogen, an alkali metal, an alkaline earth metal, or an ammonium salt residue.