3-arylbenzofuranones as stabilizers
This 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.
Claims
2. A compound according to claim 1, wherein, when n is 1, R.sub.1 is thienyl, unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 alkylthio, hydroxy, halogen, amino, C.sub.1 -C.sub.4 alkylamino or di(C.sub.1 -C.sub.4 -alkyl)amino.
3. A compound according to claim 1, wherein
- R.sub.3, R.sub.5 and R.sub.6 are hydrogen, R.sub.4 is a radical of formula III,
- R.sub.16 and R.sub.17 are methyl groups or, together with the linking carbon atom, form a C.sub.5 -C.sub.8 -cycloalkylidene ring which is unsubstituted or substituted by 1 to 3 C.sub.1 -C.sub.4 alkyl groups.
4. A compound according to claim 1, wherein
- R.sub.2 is C.sub.1 -C.sub.4 alkyl,
- R.sub.3 is hydrogen,
- R.sub.4 is a radical of formula III,
- R.sub.5 is hydrogen, and
- R.sub.16 and R.sub.17, together with the linking carbon atoms, form a cyclohexylidene ring.
5. A composition comprising
- a) an organic material which is susceptible to oxidative, thermal or light-induced degradation, and
- b) at least one compound of formula I according to claim 1.
6. A composition according to claim 5, wherein component (a) is selected from the group consisting of a lubricant, a hydraulic fluid, a metal processing fluid and a natural, semisynthetic of synthetic polymer.
7. A composition according to claim 5, wherein component (a) is a lubricant of the series of the mineral oils, the synthetic oils or a mixture thereof.
8. A composition according to claim 5, wherein component (a) is a synthetic polymer.
9. A composition according to claim 5, wherein component (a) is a polyolefin.
10. A composition according to claim 5, wherein component (a) is polyethylene or polypropylene.
11. A composition according to claim 5, which contains component (b) in an amount of 0.0005 to 5% by weight, based on the weight of component a).
12. A composition according to claim 5, which comprises further additives in addition to components (a) and (b).
13. A composition according to claim 12, which comprises as further additives phenolic antioxidants, light stabilisers and/or processing stabilisers.
14. A composition according to claim 13, which comprises as further additive at least one compound of the organic phosphite or phosphonite type.
15. A process for stabilising an organic material against oxidative, thermal or light-induced degradation, which comprises incorporating therein or applying thereto at least one compound of formula I as defined in claim 1.
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Type: Grant
Filed: Jul 23, 1998
Date of Patent: Sep 21, 1999
Inventors: Peter Nesvadba (1723 Marly), Samuel Evans (1723 Marly), Christoph Krohnke (79206 Breisach), Jurg Zingg (4153 Reinach)
Primary Examiner: Robert W. Ramsuer
Application Number: 9/121,583
International Classification: C07D40904; C08I 2326;