Azo dyestuffs

Abstract From the Canadian patent

Azo dyestuffs devoid of carboxylic acid and sulphonic acid groups and of the formula (I), x? (I), wherein R is a hydrogen atom halogen atom, cyano, nitro, hydroxy or amino group or an organic radical R1 is a hydrogen, atom, an optionally substituted hydrocarbon or heterocyclic radical or an amino group which may be substituted R2 is an optionally, substituted alkyl group with three or more carbon atoms an, optionally substituted aryl group or an aralkyl group K? is a, cationic group, x? is an anion and the ring A may carry additional substituents or have a benz ring fused thereon. Method for the manufacture of such dyestuffs and their use in dy?ng synthetic polymeric materials.