| abstract |
The present invention relates to novel pigments of formula n n(1), wherein R 1 is hydrogen or C 1 –C 12 alkyl, R 2 is hydrogen, —CN, —COO-aryl, —COO-heteroaryl, —CONH-aryl or —CONH-heteroaryl, and R 3 is the radical of a heteroaromatic compound of formula n nor R 2 and R 3 together form a radical of formula n nwherein R 4 , R 5 , R 6 and R 7 are defined herein and to a process for the preparation of those pigments, and to their use in the production of coloured plastics or polymeric colour particles. |