Jet engine oils containing extreme pressure additive
AssigneeChevron Research Company
InventorMerwyn L. Burrous
Life of this patent
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Abstract
The load carrying capabilities of a jet engine oil consisting of an ester of a C.sub.4 -C.sub.12 monocarboxylic acid and a polyol selected from pentaerythritol, dipentaerythritol, tripentaerythritol, trimethylol propane, trimethylol methane, trimethylol butane, neopentylglycol and mixtures thereof, are increased by incorporating into the jet engine oil from 4 to 8 weight percent of a soluble methyl phenyl polysiloxane having a kinematic viscosity ranging from 20 to 2,000 centistokes at 25.degree. C.
Claims4
A composition of matter comprising a major portion of a synthetic lubricating oil consisting of an ester of a C.sub.4 -C.sub.12 monocarboxylic acid and a polyol selected from pentaerythritol, dipentaerythritol, tripentaerythritol, trimethylol propane, trimethylol methane, trimethylol butane, neopentylglycol, or mixtures thereof and from 4 to 8 weight percent of a soluble methyl phenyl polysiloxane having a kinematic viscosity of 20 to 2,000 centistokes at 25.degree. C.
A lubricating oil composition for jet engines consisting essentially of a major portion of a synthetic base oil consisting of mono- and di-pentaerythritol esters of C.sub.5 to C.sub.10 straight and branched chain hydrocarbon monocarboxylic acid or mixtures thereof, from 4 to 8 weight percent of methyl phenyl silicone having a kinematic viscosity of 75 to 500 centistokes at 25.degree. C., from 0.5 to 5 weight percent of a phosphate antiwear agent, from 0.5 to 5 weight percent of a secondary aryl amine antioxidant and from 0.01 to 0.5 weight percent of 1,4-dihydroxy anthraquinone a metal deactivator.
Dependencies are inferred from the claim text.