Disazo dyes and ink jet inks containing them

摘要

A compound of Formula (1): wherein: A¹ and A² are each independently optionally substituted phenyl or naphthyl; each Q independently is optionally substituted phenylene; each R¹ independently is H or optionally substituted alkyl; R² is H or optionally substituted alkyl; and R³ is alkyl carrying a sulpho group; provided that the compound of Formula (1) carries at least one carboxylic acid group; and provided the compound of Formula (1) is not of Formula (2): wherein: m is 1 or 2; n is 1 or 2; and x is 2 to 4. Also claimed are compositions and inks.