Abstract:
The invention comprises dyes of the formula where A is a dyestuff residue free from sulphonic acid groups; R1 and R2 are H or alkyl; y is a direct bond or a bivalent radical; -CZ is an aromatic heterocycle which contains a quaternary nitrogen and may contain further hetero atoms or substituents, or be condensed with further rings; n is 1 or 2 and m is an integer greater than or equal to n. The compounds are prepared either by reacting compounds of the formulae where -CZ1 is -CZ or an unquaternized version thereof, B is A or is the residue of a compound capable of forming A, or by first reacting the above vinyl compound with ammonia or a primary amine to give where R is H or optionally substituted hydrocarbon which is then reacted with a dyestuff or dyestuff intermediate containing a reactive group to give a compound of the formula and if necessary B is then converted to A and the dyestuff quaternated.