Process for the direct preparation of pyrrolo[3,4-c]pyrroles

Details Process for the direct preparation of pyrrolo[3,4-c]pyrroles Process for the direct preparation of pyrrolo[3,4-c]pyrroles

2007-03-06

2007-03-06

Shameem, Golam M. M. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C548S452000

Reexamination Certificate

active

10489037

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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