| abstract |
The invention relates to the production of dyes of general formula (Ia), (Ib) or (Ic) or mixtures thereof, wherein (a) tetracarboxylic acids or functional derivatives thereof are reacted with (b) at least one compound selected from i. aliphatic amines, ii. aromatic amines, iii. aliphatic diamines, iv. aromatic diamines, (c) optionally in the presence of further additives, (d) optionally in the presence of wetting agents and wherein the reaction is carried out in a mixing unit. The invention further relates to use of said dyes for dyeing high-molecular weight organic and inorganic materials of natural or synthetic origin. |