Process for the coloration of polyamides

摘要: A process for the mass coloration of a synthetic linear polyamide comprises using as colouring matter chromium complex monoazo dyestuff formula A-N=N-E where is mono- or bi-cyclic aryl radical having hydroxy group in position orthoto azo linkage and E residue coupling component which couples adjacent to hydroxy, amino enolizable keto group, both optionally other substituents addition those ortho-position linkage, provided that molecule devoid sulphonic acid, carboxylic acid sulphonamide groups. The may be incorporated during after polymerization. Many suitable dyestuffs are specified.