Monazo pigments containing hydroxynaphthoylaminobenzimidazalone radical

A monoazo pigment of the formula ##STR19## wherein Z represents --CO-- or --SO.sub.2 --,

• Q represents hydrogen, bromine or methoxy,
• Y.sub.1 represents hydrogen, chlorine, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms,
• Y.sub.2 and Y.sub.3 independently represent a hydrogen, chlorine, trifluoromethyl, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, alkanoylamino of 2 to 4 carbon atoms or the --COOR.sub.1, wherein
• R.sub.1 represents alkyl of 1 to 4 carbon atoms which is unsubstituted or substituted by halogen, alkoxy of 1 to 4 carbon atoms;
• cycloalkyl of 5 to 6 carbon atoms;
• benzyl which is unsubstituted or substituted by halogen, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms;
• or phenyl which is unsubstituted or substituted by halogen, alkyl of 1 to 4 carbon atoms or alkoxy groups of 1 to 4 carbon atoms, or
• Y.sub.2 and Y.sub.3 together with the carbon atoms to which they are attached form benzene ring which is unsubstituted or substituted by chlorine,
• X.sub.1 represents hydrogen, chlorine, an alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, alkoxycarbonyl of 2 to 4 carbon atoms or phenoxy,
• R.sup.2 represents hydrogen, alkyl of 1 to 4 carbon atoms or phenyl which is unsubstituted or substituted by halogen, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms,
• X.sub.2 represents hydrogen, halogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms or a phenoxy, and
• n is 1 or 2.
• with the proviso that if R.sub.2 represents alkyl or phenyl, at least one of Y.sub.1, Y.sub.2 or Y.sub.3 may not represent hydrogen.