| 摘要 |
Triaminotriphenylmethane pigments are prepared by a) first reacting an iron, boron or aluminum trihalide complex compound of a 4,4',4''-trihalotriphenylmethane halide with a salt of an aromatic aminosulfonic acid in a molar ratio of 0.6:1 to 1.4:1 at a temperature between 130 DEG and 180 DEG C., under hydrogen halide partial pressure of at least 1 bar and in the presence of a polar, water-insoluble organic solvent, subsequently b) reacting the reaction suspension obtained according to a) with at least 5 molar equivalents of an aromatic amine subsequently c) either bringing the amine melt obtained according to b), in the absence of a water-soluble solvent, to a pH of between 1 and 6 by addition of a mineral acid or first bringing it to a pH of at least 9 with an alkali metal hydroxide solution in the presence of a viscosity-lowering additive, carrying out a phase separation, adding a water-insoluble organic solvent to the organic phase and then bringing this to a pH of between 1 and 6 by addition of a mineral acid. The pigments obtained can be processed into high-quality printing inks.
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