1,4-diketo-3,6-diarylpyrolo3,4-C!pyrrole pigment derivatives
US5786487A · kind A · utility
5Cited by
2References
31Claims
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Key dates
| Filing date | Sep 26, 1997 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Sep 26, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0033
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to pyrrolopyrrole derivatives of the formula (I) ##STR1## wherein A and B are identical or different aryl radicals, and DPP is a diaryldiketopyrrolopyrrole radical; which diketopyrrolopyrrole derivative is substituted by from 0 to 6 moles of --SO.sub.3 M per mole of the pyrrolopyrrole derivative; wherein M is hydrogen or a metal or ammonium cation. The pyrrolopyrrole derivatives of formula I are useful as rheology-improving agents for pigment dispersions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.