Blue-violet cationic azo dyes - for polyacrylonitrile and acid modified poly-esters and polyamides

摘要

Title cpds of formula (I): (where R is H, substd CH3 alkyl contg =2C atoms, alkoxy cycloalkyl, aryl, aralkyl or heterocyclic gp; R1 is H alkyl or aralkyl, or R and R1 form a heterocycle; R2 is H, alkyl or alkoxy, or halogen; R3 is alkyl, alkenyl, alkinyl or aralkyl; K is the residue of a coupling component; Ar is an anion the cyclic and acrylic gps. may carry non-ionic and/or carboxyl gps) are prepd by diazotising the 2-aminobenzthiazole corresp. to (I) coupling with the component KH and quaternising with a cpd R3X (where S is gp giving the anion A (-)).