Substituent effects on the colour, dyeing and fastness properties of 4‐phenylazo‐1‐naphthylamines and of 2‐acetylamino‐5‐methoxy‐4‐N‐ß‐cyanoethyl‐N‐ß‐hydroxyethylaminoazobenzene

The synthesis of a series of blue disperse dyes obtained by diazotisation of substituted anilines and coupling with 2-acetylamino-5-methoxy-4-N-s-cyanoethyl-N-s-hydroxyethylaniline and to N-s-hydroxyethyl-1-naphthylamine is described. Substituent effects on the colour of the dyes is discussed, with particular respect to analogous dyes derived from 4-N-s-cyanoethyl-N-s-hydroxythylaniline. Some dyes from trisubstituted anilines as diazo component colour polyester in deep blue shades of generally good fastness properties.