Heterocyclic disazo dyestuffs containing a bridging group and at least one quaternary ammonium group

摘要: Disazo compounds in which two monoazo dyestuff molecules of the general formula IN WHICH D represents residue heterocyclic diazo component, A an arylene and R'' R'''' each alkyl residue, are linked together via their coupling components through a bifunctional bridging group Z has no characteristics contains at least one quaternated nitrogen atom. The used for dyeing synthetic fibers such as polyvinyl chloride demonstrate good light washing fastness.