Diketopyrrolopyrroles and pigments thereof
US5424452A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1994 |
| Grant date | Jun 13, 1995 |
| Priority date | — |
| Expiry date | Jun 9, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0039
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
1,4-Diketopyrrolo[3,4-c]pyrroles of formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently of one another hydrogen, Cl, Br, CH.sub.3, OCH.sub.3, CN or phenyl, and at least one of the substituents R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is a group EQU --O(CH.sub.2).sub.n X or --O(CH.sub.2 CH.sub.2 O).sub.p CH.sub.2 CH.sub.2 X wherein PA0 n is an integer from 2 to 12, and PA0 p is an integer from 1 to 3, PA0 X is a heterocyclic radical selected from the group consisting of pyrrolyl and indolyl, or is a substituted amino group as defined in the specification. Pigment compositions comprising a minor amount of said compounds and diketopyrrolopyrrole pigments have excellent rheological and colouristic properties, especially in paint systems and in printing inks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.