| abstract |
An alpha-II form of a 1,4-diketo-3,6-di(4'-tertiary butyl phenyl)-2,5-dihydro pyrrolo[3,4-c]pyrrole pigment characterized by C.I.E color space values, particularly a high chroma value and yellow hue, in masstone, and a process for its preparation is disclosed. The 1,4-diketo-3,6-di(4'-tertiary butyl phenyl)-2,5-dihydro pyrrolo[3,4-c]pyrrole pigment is especially useful for coloring coating compositions, such as automotive paints, and plastics. |