Yellow diketopyrrolopyrrole pigments
US5672716A · kind A · utility
1Cited by
7References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1995 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Oct 31, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B57/004
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to diketopyrrolo3,4-c!pyrroles of formula ##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other hydrogen, halogen, C.sub.1 -C.sub.6 alkyl, cyano or a --OR.sub.3, --COOR.sub.3, --CON(R.sub.3)(R.sub.4), --COR.sub.3 or --N(R.sub.3)(R.sub.4) group, and R.sub.3 and R.sub.4 are each independently of the other hydrogen, C.sub.1 -C.sub.6 alkyl, phenyl which is unsubstituted or substituted by halogen or C.sub.1 -C.sub.6 alkyl. Said diketopyrrolo3,4-c!pyrroles are pigments colored in a strong yellow shade having good fastness properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.