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AssigneeExxonMobil Research and Engineering Company
InventorsDavid A. Blain, Liehpao Oscar Farng, Eugenio Sanchez, Michael R. Douglass, Angela S. Galiano-Roth, James T. Carey
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A Group IV/Group V lubricating composition providing improved antioxidation performance comprises from 5 wt. % to 40 wt. % of a Group V base oil component, such as alkylated naphthalene, at least 30 wt. % of a Group IV base oil component, such as one or more polyalphaolefin base stocks, and from 0.25 wt. % to 1.5 wt. % of a trithiophosphate-containing compound. The trithiophosphate-containing compound is preferably C30H57O7PS3. The lubricating composition includes not greater than 5 wt. % of a Group I, Group II, or Group III base oil component, and, preferably not greater than 10 ppm heavy metal component. The lubricating composition preferably has a kinematic viscosity of from 20 cSt to 1,000 cSt at 40° C. and a viscosity index (VI) of from 130 to 200.
A lubricating composition comprising in admixture:
A method of producing a lubricating composition, comprising blending together at least the following components:
A method of improving the antioxidation performance of a lubricating composition comprising in admixture from 15 wt. % to 25 wt. % of a Group V base oil component, based on the total weight of the blend components that are used to produce the lubricating composition, wherein the Group V base oil component is alkylated naphthalene, and from 65 wt. % to 85 wt. % of a Group IV base oil component, based on the total weight of the blend components that are used to produce the lubricating composition, wherein the Group IV base oil component is one or more polyalphaolefin base stocks, the method comprising the step of:
Dependencies are inferred from the claim text.