Basf Aktiengesellschaft

Basf Se Corporation

Josef Hetzenegger

Peter Erk

Georg Henning

Andreas Stohr

Ingo Klopp

Heinrich Kowarsch

Hans-Joachim Uschmann

Peter B&ouml;ttcher

The invention provides a process for preparing N,N'-di(3&#x2032;,5&#x2032;-dimethylphenyl)perylene bis(dicarboximide), and other pigments having modified properties, by reaction of perylene-3,4,9,10-tetracarboxylic dianhydride with 3,5-dimethylaniline, or a mixture of 3,5-dimethyl aniline and at least one other primary amine, in the presence of a secondary amine or tertiary amine as catalyst, wherein the reaction occurs in an aqueous reaction medium and in the presence of added seed crystals of N,N&#x2032;-di(3&#x2032;,5&#x2032;-dimethylphenyl) perylenebis(dicarboximide), such that the aqueous medium is present at the beginning of the reaction.

Preparation of Pigment Red 149

Incipiently chlorinated copper phthalocyanine pigments having a chlorine content of from 10 to 40% by weight and a dispersion harshness &lE;10 in LDPE are useful for coloring plastics.

Chlorinated copper phthalocyanine pigments

Pigment preparation with perylene derivatives as dispersants

Growing community of inventors

Birkenheide, Germany

Josef Hetzenegger