Borated-epoxidized polybutenes as low-ash anti-wear additives for lubricants
AssigneeExxonMobil Research and Engineering Company
InventorsBeth A. Yoon, Liehpao Oscar Farng, George Skic
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Abstract
An engine lubricant that is substantially free of zinc and phosphorous contains an antiwear additive comprising borated 1,2 epoxy mixed polybutenes having an average carbon number in the range of C20 to about C120.
Claims6
A method for improving the wear properties of a substantially zinc and phosphorus free lubricating oil, the method comprising adding to the oil borated 1,2 epoxy mixed polybutenes having an average carbon number in the range of C20 to about C120 in an amount to provide the oil with less than 300 ppm boron, the wear properties of the lubricating oil being improved in comparison to the wear proverties exhibited by substantially zinc and phosphorus free lubricating oil which does not contain the borated 1,2 epoxy mixed polybutenes.
A method for reducing wear in an engine by lubricating the engine using a lubricating oil substantially free of zinc and phosphorus comprising a major amount of a base oil and a minor amount of borate 1,2 epoxy mixed polybutenes having an average carbon number in the range of C20 to about C120 wherein the lubricating oil contains less than 300 ppm boron, the wear being reduced to a higher degree than when the substantially zinc and phosphorus free oil does not contain the borated 1,2 epoxy mixed polybutenes.
Dependencies are inferred from the claim text.