Phenylazo-(N-alkylanilino)-m-toluene sulfonic acid or sulfonamide acid dyes for polyamide fiber materials

摘要

A series of azo dyes for dyeing polyamide fibrous material are provided by coupling an appropriate diazotized aminobenzene into an appropriately substituted N-alkyl-N-phenylbenzylamine. The dyes are characterized by the presence of one sulfonic acid group, either as the free acid or in salt form, and by the presence of one sulfamyl group. The single sulfonic acid group and single sulfamyl group are positioned interchangeably as a substituent on either the aminobenzene base or the benzyl radical forming a portion of the N-alkyl-N-phenylbenzylamine. When dyed from an appropriate dye bath, these dyes produce dyeings on polyamide fiber material characterized by outstanding lightfastness and excellent transfer properties.