| 摘要 |
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.
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