Azo dyes - of the benzimidazole series for natural - and synthetic polyamides

摘要

Mono- and disazo dyes containing sulphonic acid groups, of formula (in which A is H, Cl, CH3, OCH3, B and R are H or CH3, X is carbonamide or carboalkoxy with 2 - 5C, Y is H, Cl, Br, CH3, or HSO3, m is 1 or 2, n is 0 or 1, and Z is H, Cl, Br, CH3, OCH3, OEt, carboxyl, 2 - 9C carbalkoxy, caronamide, opt. (-mono - or N,N-di-substd. sulphonic acid, sulphonamide, opt. N-mono or N,N-disubstd., when m = 1. When m = 2, Z is -O-, -CH2-, -SO2NHCH2CH2NHSO2-, -SO2NHSO2- or a direct bond. When n = 0, Z is HSO3. The dyes are suitable for use on natural and synthetic polyamides, e.g. wool, leather, polycaprolactam or polyhexamethylene diamine adipate.