Patent ID: 6645909
Filing Date: 2003-11-11
Classification: B41M,G03C

Abstract:
A process for an azo coupling reaction comprising carrying out a coupling reaction of a diazonium salt and a coupler to make said diazonium salt form color, said coupler having one of the structures represented by the following general formulae (1), (2) and (3): wherein X1, X2, X3 and X4 each independently represents an atomic group necessary for forming a 5-membered aromatic heterocyclic ring; Y represents an amino group, a substituted amino group, a hydroxyl group, an alkoxy group, an alkyl group, which may have a substituent, provided that X1 and Y may be combined to form a heterocyclic ring; L represents a substituent capable of being released as a carbonium ion upon coupling with said diazonium salt; and EWG1 and EWG2each independently represents an electron withdrawing group, provided that EWG1 and EWG2 may be combined to form a heterocyclic ring.