Stabilization of pyrrolopyrrole pigments
US5389141A · kind A · utility
9Cited by
12References
14Claims
0Family size
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Inventor
Key dates
| Filing date | Dec 22, 1993 |
| Grant date | Feb 14, 1995 |
| Priority date | — |
| Expiry date | Dec 22, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0065
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Pigment compositions comprising PA1 a) at least one pyrrolo[3,4-c]pyrrole pigment of the formula ##STR1## in which A and B, independently of one another, are isocyclic or heterocyclic aromatic radicals, and D is an oxygen or sulfur atom, and PA1 b) from 1 to 100% by weight, based on the pigment, of a nitroxyl compound or of an acid-addition salt thereof. These pigment compositions are distinguished by excellent light stability and weathering resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.