PROCESS FOR THE MANUFACTURE OF MIXED CRYSTALS OF PIGMENTS ON THE BASIS OF DIIMIDES OF PERYLENE TETRACARBOXYLIC ACID, AND THEIR USE
Process for preparing perylenetetracarbimide mix-crystal pigments in the crystal lattice of the alpha -modification of the N,N'-bis-3',5'-dimethylphenylperylenetetracarbimide of the formula (1) comprising essentially symmetrical N,N'-bis-3',5'-dimethylphenylperylenetetr...
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Zusammenfassung: | Process for preparing perylenetetracarbimide mix-crystal pigments in the crystal lattice of the alpha -modification of the N,N'-bis-3',5'-dimethylphenylperylenetetracarbimide of the formula (1) comprising essentially symmetrical N,N'-bis-3',5'-dimethylphenylperylenetetracarbimide of the formula (1) and at least one asymmetrically substituted diimide of the formula (2) in which R stands for methyl or ethyl (1) (2) by condensing 1 mole of perylenetetracarboxylic dianhydride with an excess of up to 30 moles of 3,5-dimethylaniline which contains in total 0.5-6 percent by weight of 4-ethoxyaniline, and their use for coloring organic polymers. |
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