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US 5,516,920 AGranted
3-arylbenzofuranones
AssigneeCiba-Geigy Corporation
InventorsPeter Nesvadba, Samuel Evans, Christoph Krohnke, Jurg Zingg
Life of this patent
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Abstract
The invention described novel compounds of formula ##STR1## wherein the general symbols are as defined in claim 1, as stabilisers for protecting organic materials, in particular polymers and lubricants, against thermal, oxidative or light-induced degradation.
Claims4
A compound of formula I ##STR118## wherein, n is 1;
- R.sub.1 a radical of formula II ##STR119## R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each independently of one another hydrogen or C.sub.1 -C.sub.6 alkyl, with the proviso that at least two of R.sub.2, R.sub.3, R.sub.4 or R.sub.5 are C.sub.1 -C.sub.6 alkyl;
- R.sub.6 is hydrogen;
- and
- R.sub.7, R.sub.8, R.sub.9, R.sub.10 and R.sub.11 are each independently of one another hydrogen or C.sub.1 -C.sub.6 alkyl, with the proviso that at least two of R.sub.7, R.sub.8, R.sub.9, R.sub.10 or R.sub.11 are C.sub.1 -C.sub.6 alkyl.
1 more element
Dependencies are inferred from the claim text.