Process for the preparation of highly coloured diazo pigment mixtures
AssigneeCiba Specialty Chemicals Corporation
InventorsBernhard Medinger, Daniel Andrey
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Abstract
A process for the preparation of diazo pigment mixtures, which comprises condensing 2 mol of an azocarboxylic acid chloride of formula ##STR1## with 1 mol of a mixture of diamines of formulae ##STR2## at a molar ratio of II:III:IV from 0-30:5-60:40-95, the condensation and isolation of the product obtained being carried out by customary methods. The diazo pigment mixtures so obtained are distinguished by high color strength and chroma.
Claims9
A process for the preparation of a diazo pigment mixture, which comprises condensing 2 mol of an azocarboxylic acid chloride of formula ##STR10## with 1 mol of a mixture of diamines of formulae ##STR11## at a molar ratio of II:III:IV from 0-30:5-60:40-95,
- the condensation and isolation of the product obtained being carried out by customary methods.
A solid solution consisting of the diazo pigments of formulae ##STR12## at a molar ratio of V:VI:VII of 25:25:50.
Dependencies are inferred from the claim text.