Alkylated 5,6,7,8-tetrahydronaphthalenols as antioxidants in lubricating oils and greases
AssigneeUop LLC
InventorBruce E. Firth
Life of this patent
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Abstract
Alkylated 5,6,7,8-tetrahydronaphthalenols are effective antioxidants for fuel oils, lubricating oils, greases, plastics, and rubbers over a wide temperature range. Di- and tri-alkylated tetrahydronaphthalenols are especially effective, with the di- and tri-isopropylated materials being preferred.
Claims11
A composition comprising a lubricating oil or grease containing from about 5 ppm to about 5% by weight of an additive selected from the group consisting of dialkyl- and trialkyl-5,6,7,8-tetrahydronaphthalenols, and the dehydrocyclization products of said trialkyl-5,6,7,8-tetrahydronaphthalenols, wherein each alkyl group contains from 3 to about 16 carbon atoms.
The method of inhibiting oxidation in lubricating oils and greases comprising adding thereto an oxidation inhibiting amount of an additive selected from the group consisting of dialkyl- and trialkyl-5,6,7,8-tetrahydronaphthalenols, and the dehydrocyclization products of said trialkyl-5,6,7,8-tetrahydronaphthalenols, wherein each alkyl group contains from 3 to about 16 carbon atoms.
Dependencies are inferred from the claim text.