An ink jet ink including at least a compound represented by the following general formula (I) and organic solvents. When the organic solvents are classified by M_OH/M_W indicating a proportion of the molecular weight of hydroxyl group to the molecular weight of the organic solvents into an organic solvent A whose M_OH/M_W is 0 or more and less than 0.2, an organic solvent B whose M_OH/M_W is 0.2 or more and less than 0.4, and an organic solvent C whose M_OH/M_W is 0.4 or more and less than 1.0, the ink contains at least one organic solvent A, at least one organic solvent B and at least one organic solvent C. The at least one organic solvent A contains a nitrogen-containing organic solvent in an amount of 80.0% by mass or more of the at least one organic solvent A.

Disclosed is a photoreceptor comprising a support and a photosensitive layer which contains an axo compounf of the formula [i]: wherein Q is a halogen atom, a hydrogen atom, an alkyl group, an alkoxy group, an alkylsulfonyl group, an aryl group, an acetylamido group, (Q, is an alkyl group, an alkoxy group, a phenyl group, an amino group, a hydroxy group or a hydrogen atom) or (Q,, Q₃ and Q₄ independently are an alkyl group, an alkoxy group, a phenyl group, an acyl group, an ester group, a hydroxy group, a cyano group, a vinyl group, a halogen atom or a hydrogen atom), said alkyl group, alkoxy group, aryl group, amino group and vinyl group may have a substituent; Y, and Y₂ independently are hydrogen atom, a halogen atom, a cyano group, a hydroxy group, an alkyl group or an alkoxy group; m and n each represent an integer of 0 to 2, and m and n cannot be both 0; A represents a group represented

by any one of the following formulae: wherein Z is a group of atoms necessary for constituting a substituted or unsubstituted aromatic carbon ring or an aromatic heterocyclic ring. P₃ is a substituted or unsubstituted carbamoyl group or a substituted or unsubstituted sulfamoyl group. R. is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted amino group, a substituted or unsubstituted carbamoyl group, a carboxyl group and its ester group or a cyano group, A' is a substituted or unsubstituted aryl group, R, and R₃ independently are a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group or a substituted or unsubstituted aryl group.

Disclosed is a photoreceptor comprising a support and a photosensitive layer which contains an azo compound of the formula (I): wherein P_I and P₂ are independently a halogen atom, a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, an acetylamido group, an alkylsulfonyl group, (Q₁ is an alkyl group, an alkoxy group, a phenyl group, an amino group, a hydroxy group or a hydrogen atom) or Q₂-C- (Q₁, Q₃ and Q₄ independently are a halogen atom, a hydrogen atom, an alkyl group, an alkoxy group, a phenyl group, an acyl group, an ester group, a hydroxy group or a vinyl group), the alkyl group, alkoxy group, aryl group, amino group and vinyl group may have a substituent;

Y₁ and Y₂ independently are a hydrogen atom, a halogen atom, a cyano group, a hydroxy group, an alkyl group or an- alkoxy group; m and n each represent an integer of 0 to 2, and m and n cannot be both 0; A represents a group representend by any one of the following formulae: wherein Z is a group of atoms necessary for constituting a substituted or unsubstituted aromatic carbon ring or an aromatic heterocyclic ring, P₃ is a substituted or unsubstituted carbamoyl group or a substituted or unsubstituted sulfamoyl group, R₁ is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted amino group, a substituted or unsubstituted carbamoyl group, a carboxyl group and its ester group or a cyano group, A' is a substituted or unsubstituted aryl group, R₂ and R₃ independently are a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group or a substituted or unsubstituted aryl group.

Verfahren zum Herstellen von Monoazo- oder Disazo- pigmenten, dadurch gekennzeichnet, dass man a) zu einer Lösung eines Diazonium- und/oder Tetrazoniumsalzes eines aromatischen oder heterocyclischen Amins eine Lösung oder Suspension enthaltend 0,1-50 Gew.% des theoretisch einzusetzenden Gesamtgewichts einer oder mehrerer Kupplungskomponenten zugibt, und b) die Kupplungsreaktion durch Beimischen des gemäss Verfahrensschritt a) erhaltenen teilweise gekuppelten Produkts zu einer Lösung oder Suspension einer oder mehrerer im Verfahrensschritt a) eingesetzten oder davon verschiedenen Kupplungskomponente vervollständigt.

Die so hergestellten Pigment zeigen verglichen mit nach herkömmlichen Methoden hergestellten Produkten erhöhte Farbstärke, verbesserte Transparenz, verbesserte Fliesseigenschaften, erhöhte Reinheit und Dispergierbarkeit.

Compounds of the general formula (I) a process for their preparation and their use for dyeing and/or printing organic substrates.