| 摘要 |
1. A method for production of pigment preparations through sedimentation on an aluminium carrier of monoazo dyes of pyrazolone derivatives with the general formula shown in the diagram, wherein A denotes a radical of a benzene derivative active component and R denotes a methyl, carboxyl or carboxyethyl radical, characterised in that the carrier used is aluminium hydroxide and/or basic aluminium carbonate in a mixture with alkaline metal salts or ammonium salts of aromatic carboxyl acids, and the aluminium hydroxide and/or basic aluminium carbonate is pre-distributed in an aqueous or aqueous solvent environment, possibly in the presence of auxiliary agents, and a dye is introduced to the reaction zone, preferably in the form of a solution, in a quantity of at least 5 parts by weight per 100 parts by weight of aluminium hydroxide and/or basic aluminium carbonate and alkaline metal salts or ammonium salts of aromatic carboxyl acids, preferably sodium benzoate, in a quantity of at least 5 parts by weight per 100 parts by weight of aluminium hydroxide and/or basic aluminium carbonate, maintaining the whole at a temperature below 100 degrees C, preferably 10-50 degrees C and pH 3.0-8.0, preferably 4.5-5.5, and the obtained product is separated from the reaction medium, preferably rinsed with water, possibly dried and, if necessary, ground into finer particles.<IMAGE>
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