2-[[1-[[(2,3-DIHYDRO-2-OXO-1H-BENZIMIDAZOL-5-YL)AMINO]CARBONYL]-2-OXOPROPYL]AZO]-BENZOIC ACID AND A PROCESS FOR ITS PREPARATION

摘要

The present invention is directed to 2-[[1-[[(2,3-dihydro-2-oxo-1H-benzimidazol-5- yl)amino]carbonyl]-2-oxopropyl]azo]-benzoic acid (C.I. Pigment Yellow 151): (I) , characterized by a ?E* (black/white) in masstone below 22.0 ± 0.7, a process for its preparation and its use for pigmenting macromolecular organic materials of natural or synthetic origin. The pigment has high opacity and high color strength.