Mix-crystal pigments based on perylenetetracarbimides, process f

Details Mix-crystal pigments based on perylenetetracarbimides, process f Mix-crystal pigments based on perylenetetracarbimides, process f

1988-01-20

1988-09-06

Daus, Donald G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

524 90, 106498, C09B 5700

Patent

active

047694602

ABSTRACT:
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 ##STR1## 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.

REFERENCES:
patent: 3554776 (1971-01-01), Gerson et al.

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