Industrial oils of enhanced resistance to oxidation
AssigneeExxonMobil Research and Engineering Company
InventorsKevin David Butler, Alison Fiona Miller, Todd Timothy Nadasdi
Life of this patent
Estimating the term…
Abstract
A lubricating oil formulation containing a major amount of a base oil of lubricating viscosity and a minor amount of additives comprising a combination of phenyl naphthyl amine, dimercaptothiadiazole or derivative thereof, and triazole or benzotriazole or derivative thereof, exhibiting enhanced resistance to oxidation.
Claims4
A lubricating oil of enhanced oxidation resistance comprising a major amount of a naturally or synthetically derived base oil, or a mixture of such base oils, of lubricating viscosity, and a minor amount of additives comprising unsubstituted phenyl naphthyl amine present in an amount in the range of about 0.05 to 1 wt % active ingredient, one or more dimercaptothiadiazoles or derivatives thereof of the formula
- present in an amount in the range of about 0.001 to 0.5 wt % active ingredient, wherein R1 and R2 are the same or different, and are selected from hydrogen, C1-C20 hydrocarbyl or C1-C20 alkyl and wherein at least one of R1 or R2 is not hydrogen, and x and y are the same or different integers ranging from 1 to 5, and one or more triazoles or benzotriazoles or derivatives thereof of the formula
- present in an amount in the range of about 0.005 to 0.5 wt % active ingredient, wherein R4 is hydrogen or C1-C10 alkyl and x is an integer ranging from 1 to 4, R5 and R6 are hydrocarbyl or substantially hydrocarbyl, R11 and R12 are hydrocarbyl or substantially hydrocarbyl, in the absence of diphenylamine or diamine antioxidants.
A method for enhancing the oxidation resistance of a lubricating oil comprising adding to the lubricating oil a minor amount of additives comprising unsubstituted phenyl naphthyl amine in an amount in the range of about 0.05 to 1 wt % active ingredient, one or more dimercaptothiadiazoles or derivatives thereof of the formula
- present in an amount in the range of about 0.001 to 0.5 wt % active ingredient, wherein R1 and R2 are the same or different, and are selected from hydrogen, C1-C20 hydrocarbyl or C1-C20 alkyl and wherein at least one of R1 or R2 is not hydrogen, and x and y are the same or different integers ranging from 1 to 5, and one or more triazoles or benzotriazoles or derivatives thereof of the formula
- present in an amount in the range of about 0.005 to 0.5 wt % active ingredient, wherein R4 is hydrogen or C1-C10 alkyl and x is an integer ranging from 1 to 4, R5 and R6 are hydrocarbyl or substantially hydrocarbyl, R11 and R12 are hydrocarbyl or substantially hydrocarbyl, in the absence of diphenylamine or diamine antioxidants.
Dependencies are inferred from the claim text.