Heterocyclic polynuclear pigments and process for preparing same
US4048173A · kind A · utility
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7Claims
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Key dates
| Filing date | Mar 2, 1976 |
| Grant date | Sep 13, 1977 |
| Priority date | — |
| Expiry date | Mar 2, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B5/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
New compounds are disclosed having the general formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 may be the same or different and are selected from the class consisting of H, Cl and OCH.sub.3. They are useful as pigments. They are prepared by reacting a substituted or unsubstituted 1-aza-2-hydroxybenzanthrone with 2,3-dichloro-1,4-naphthoquinone, in the presence of pyridine, at a temperature between 80.degree. and about 120.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.