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

1990-09-19

1992-10-13

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106 22, 106 23, 106493, 106494, 546 37, C08K 504

Patent

active

051547708

ABSTRACT:
Perylenetetracarbimide mix-crystal pigments in the crystal lattice of the .alpha.-modification of N,N'-bis-3',5'-dimethylphenylperylenetetracarbimide of the formula (1) comprising 99-70 mole percent of the symmetrical diimide of the formula (1) and correspondingly 1-30 mole percent of the asymmetrically substituted diimide of the formula (2) ##STR1## process for their preparation and their use for coloring organic polymers.

REFERENCES:
patent: 2905685 (1959-09-01), Eckert et al.
patent: 2905686 (1959-09-01), Eckert et al.
patent: 3554776 (1971-01-01), Gerson et al.
patent: 4262851 (1981-04-01), Graser et al.
patent: 4769460 (1988-09-01), Spietschka et al.

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