Cationic diazo dyes - for polyacrylonitrile fibres giving yellow to orange shades

摘要

New dyes of formula: (where R = lower alkyl; R1 and R2 = H, Me or alkoxy; the ring B may be substd. by one or several Me gps.; X is anion) are very water-soluble, have high affinity for polyacrylonitrile fibres and have good stability esp. to light. They give yellow to orange colours.