Organic pigments derived from coumarin
US4240967A · kind A · utility
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1References
8Claims
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Assignee
Inventor
Key dates
| Filing date | Aug 13, 1979 |
| Grant date | Dec 23, 1980 |
| Priority date | — |
| Expiry date | Aug 13, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B57/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This application is directed to compounds which are useful as pigments. The compounds are represented by the formula: ##STR1## where R.sub.1 is hydrogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, chlorine or bromine; PA1 R.sub.2 is hydrogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, chlorine, bromine and nitro; and ##STR2## where R.sub.4 and R.sub.5 are hydrogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, chlorine or bromine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.