| 摘要 |
<p>A process for the production of azo pigments having increased colour strength and purity by condensation of an azo dyestuff carboxylic acid halide of the formula (I) wherein A represents an aromatic radical, Q, X, Y and Z represent hydrogen atoms or non-solubilising substituents, and Hal represents a halogen atom, with a diamine of the formula H2N-B-NH2 wherein B represents an arylene radical which optionally contains non-solubilising substituents, in the molar ratio 2:1, which process comprises the use, in addition to the carboxylic acid chloride of the formula I (main component). of an additional component of the formula wherein A has the meaning given in formula I, Q', Y, X', Y' and Z' represent non-watersolubilising substituents, whilst at least one of the substituents X', Y' and Z' contains at least two atoms more selected from the series consisting of C, O, S, N or Si than Z, Y or Z, or at least two of the substituents X', Y' or Z' contain at least one atom more selected from the series consisting of C, O, S, N or Si than X, Y or Z, or coupling a mixture of the diazo compound of the amines of the formulae and wherein X, X', Y, Y', Z and Z' have the given meanings, with a bis-naphthol of the formula wherein Q and B have the given meanings. The pigments so obtained give fast and strong red colorations in lacquers and plastics.</p> |
