| 摘要 |
The invention relates to a mixture of at least two different pigments of the formula <IMAGE> (I) with the difference lying in the meanings of the radicals A and B, in which the formula (I) A and B are the same or different alkyl, aralkyl, cycloalkyl, carbocyclic or heterocyclic aromatic radicals, which mixture of pigments is obtainable by (a) reacting 1 mole of a disuccinate with 1.75 to 1.998 moles of a nitrile of the formula ACN and 0.002 to 0.25 mole of a nitrile of the formula BCN or of a mixture of several nitriles of the formula BCN, the radicals B of which are different from A, or (b) reacting 1 mole of a lactam of formula (II) or of an enamine of formula (III) <IMAGE> (II) <IMAGE> (III) in which formula each of R and R' independently of the other is alkyl or aryl, with 0.75 to 0.998 mole of a nitrile of the formula ACN and 0.25 to 0.002 mole of a nitrile of the formula BCN or of a mixture of several nitriles of the formula BCN, the radicals B of which are different from A, in an organic solvent, in the presence of a strong base and at elevated temperature, and subsequently hydrolyzing the resultant reaction product. The mixture of pigments is suitable for coloring material of high molecular weight, in particular plastics and lacquers, in red shades of excellent fastness properties. |
