Patent ID: 8454710

Claim:
A method for producing an azo pigment represented by the general formula (1), comprising: preparing a solution comprising a compound represented by the following general formula (2) and an acid; and conducting azo coupling by bringing the solution into contact with a diazonium salt derived from a heterocyclic amine: wherein G 2 represents a hydrogen atom, an aliphatic group, an aryl group, or a heterocyclic group; R 21 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group; R 22 represents a substituent; A 2 ′ represents the following general formulae (A-1) to (A-18), (A-20) to (A-28), and (A-30) to (A-32); m represents an integer of from 0 to 5; n represents an integer of from 1 to 4; when n=2, the general formulae (1) and (2) each represents a dimer formed through R 21 , R 22 , G 2 , or A 2 ′; when n=3, each of the general formulae represents a trimer formed through R 21 , R 22 , G 2 , or A 2 ′; and when n=4, each of the general formulae represents a tetramer formed through R 21 , R 22 , G 2 , or A 2 ′: wherein R 51 to R 59 each represents a hydrogen atom or a substituent, and adjacent substituents may be connected to each other to form a 5- or 6-membered ring; and * shows a site connected to the azo group in the general formula (1).