abstract |
Process for the preparation of opaque perylenetetracarboxylic acid bis-(3,5-dimethylphenylimide), which comprises heating the α-modification of perylenetetracarboxylic acid bis-(3,5-dimethylphenylimide) in at least one aliphatic monocarboxylic acid. Use as a pigment for plastic compositions, printing inks, fibres and paints. |