Process for the direct preparation of pyrrolo[3,4-c]pyrroles
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United States of America Patent
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Mar 6, 2007
Grant Date -
Dec 9, 2004
app pub date -
Sep 3, 2002
filing date -
Sep 11, 2001
priority date (Note) -
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Abstract
The present invention relates to a process for the direct preparation of pyrrolo[3,4-c]pyrroles (DPPs) of the formula (1), pigment compositions containing them and their use for coloring high molecluar weight organic materials, such as plastics and paints. The obtained DPPs of the formula I posses a higher color strength, a higher chroma, a purer shade and a higher opacity versus corresponding commerically available DPPs.
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