Lubricant compositions containing dithiocarbamyl antioxidants
AssigneeCiba-Geigy Corporation
InventorSiegfried Rosenberger
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Abstract
Esters of phenol-dithiocarbamic acids when added even in very small amounts to lubricants are effective as stabilizers against oxidation and corrosion, and also as extreme-pressure additives and anti-wear additives.
Claims8
A lubricant comprising a major proportion of an oil of lubricating viscosity and from 0.001 to 5% by weight of a stabilizer of the formula I ##STR16## wherein R and R.sub.1 is C.sub.1 -C.sub.8 alkyl, phenyl or benzyl, R.sub.2 is hydrogen or C.sub.1 -C.sub.8 alkyl and the dithiocarbamic group is in the m- or p-position relative to the hydroxyl group of the phenol.
A lubricant according to caim 1, which contains, as stabiliser, S-(3,5-di-tert.-butyl-4-hydroxybenzyl)-N,N-di-n-octyl-dithiocarbamide.
A method of stabilizing a lubricant, said lubricant comprising a major proportion of an oil of lubricating viscosity which comprises incorporating into the lubricant from 0.001 to 5% of a compound of the formula ##STR20## wherein R and R.sub.1 is C.sub.1 -C.sub.8 alkyl, phenyl or benzyl, R.sub.2 is hydrogen or C.sub.1 -C.sub.8 alkyl and the dithiocarbamic group is in the m- or p-position relative to the hydroxyl group of the phenol.
Dependencies are inferred from the claim text.