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US 4,014,870 AGranted
Stilbene compounds
AssigneeCiba-Geigy Corporation
InventorHans Rudolf Meyer
Life of this patent
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Abstract
New stilbene compounds, a process for their preparation as well as a process for optically brightening organic materials on using said stilbene compounds are disclosed.
Claims8
A stilbene compound of the formula ##STR78## wherein X denotes a 4-biphenyl radical,
- R.sub.1 denotes hydrogen, alkyl having 1 to 4 carbon atoms, chlorine, cyclohexyl, carbalkoxy having 2 to 5 carbon atoms, carboxyl or sulpho,
- R.sub.2 denotes hydrogen or alkyl having 1 to 4 carbon atoms,
- R.sub.3 denotes hydrogen or sulpho,
- R.sub.4 denotes hydrogen,
- R.sub.5 denotes hydrogen, or sulpho, and
- R.sub.6 denotes hydrogen or sulpho, the molecule containing at least one but not more than two sulpho groups.
3 more elements
Dependencies are inferred from the claim text.