Preparation of mixed crystals and solid solutions of 1,4-diketopyrrolopyrroles
US5808094A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1997 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Jul 22, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0039
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of mixed crystals of 1,4-diketopyrrolo3,4-c!pyrroles, consisting of 1 mol each of two different compounds of formula ##STR1## by heating a corresponding mixture in solid form to the temperature range from 220.degree. to 380.degree. C. PA0 A and B are, for example, each a group of formula ##STR2## wherein R.sub.1 and R.sub.2 are each independently hydrogen, chloro, bromo, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.6 alkoxy, C.sub.1 -C.sub.6 alkylamino, phenyl or --CN, PA1 G is --O--, --NR.sub.7 --, --N.dbd.N-- or --SO.sub.2 --, PA1 R.sub.3 and R.sub.4 are hydrogen, and R.sub.7 is hydrogen, methyl or ethyl. PA0 The mixed crystals and solid solutions obtained are excellently suited for pigmenting high molecular weight material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.