Process for the direct preparation of pyrrolo[3,4-c]pyrroles
US7186847B2 · kind B2 · utility
1Cited by
11References
13Claims
0Family size
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Key dates
| Filing date | Sep 3, 2002 |
| Grant date | Mar 6, 2007 |
| Priority date | — |
| Expiry date | Nov 26, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2211/1044
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.