Mixed crystal pigments based on halogenated perylenetetracarboxi

Details Mixed crystal pigments based on halogenated perylenetetracarboxi Mixed crystal pigments based on halogenated perylenetetracarboxi

1990-12-12

1992-06-23

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

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

106493, 106494, 10628721, 8657, 546 37, C08K 534, C09B 6720

Patent

active

051239663

ABSTRACT:
In the art of pigmenting high molecular weight organic materials there is a long-felt need for high-hiding organic red pigments, in particular yellowish red pigments, which are increasingly used to replace the ecologically unsafe inorganic red pigments. However, this gap in the market cannot be satisfactorily filled by using the tetrachloroperylenetetracarboximide pigments known for the aforementioned purpose.
According to the invention, it has now been found that a chlorine content of .ltoreq.25% in such chlorinated perylimides confers remarkable coloristic properties on the pigments thus produced, so that these pigments are superior in hiding powder and masstone to the tetrachloroperylimide compounds described. Accordingly, the invention is directed to high-hiding red pigments of the type of the halogenated perylenetetracarboximides containing up to 4 chlorine atoms, whose chlorine content is 15-25% and which are present as mixed crystal pigments in the .beta.-modification with an average particle size of ideally .gtoreq.0.15 .mu.m. Perylimide compounds having a higher chlorine content favor the simultaneous formation of the .alpha.-phase.

REFERENCES:
patent: 3554776 (1971-01-01), Gerson et al.
patent: 3615800 (1971-10-01), Spietschka et al.
patent: 4256507 (1981-03-01), Kranz et al.
patent: 4431806 (1984-02-01), Spietschka et al.
patent: 4846892 (1989-07-01), Henning et al.

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