Azo compound, azo pigment, pigment dispersion, coloring composition, ink for inkjet recording, coloring composition for color filter, color filter, and process for preparing a coloring composition for color filter

摘要

An azo pigment and pigment dispersion show excellent coloring characteristics and light fastness. The azo pigment is represented by general formula (1), its tautomer, a salt or hydrate thereof:; wherein G is hydrogen or an aliphatic, aryl, heterocyclic, acyl, aliphatic oxycarbonyl, carbamoyl, or sulfonyl group, R₁ is an amino, aliphatic oxy, aliphatic, aryl, or heterocyclic group, R₂ is a substituent, A is an aromatic 5- or 6-membered heterocyclic group, m is an integer of 0 to 5, n is an integer of 1 to 4 and, when n=2, 3 or 4, the formula represents a dimer, trimer, or tetramer, respectively, formed through R₁, R₂, A, or G.