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US 8,877,956 B2Granted
1,3,2-dioxaphosphorinane, 2-sulfide derivatives for use as anti-wear additives in lubricant compositions
AssigneeAfton Chemical Corporation
InventorsJohn Marshall Baker, Naresh Mathur, Roger M. Sheets, David J. Degonia
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Abstract
The present disclosure relates to a non-acidic, sulfur-containing, phosphorus-containing compound of the formula I where R1, R2, R3, R4, R5, R6, and R7 are as defined herein. Such a compound may exhibit improved antiwear performance and thermal stability in lubricating compositions.
Claims2
A method of making a lubricant additive, comprising:
- reacting a 1,3-diol with a trialkyl phosphite to form a 1,3,2-dioxaphosphorinane;
- and
- reacting the 1,3,2-dioxaphosphorinane with elemental sulfur or an organic sulfur compound to form a 2-sulfide-1,3,2-dioxaphosphorinane.
A method of making a lubricant additive, comprising:
- reacting a 1,3-diol with a trialkyl phosphite to form a 1,3,2-dioxaphosphorinane;
- reacting the 1,3,2-dioxaphosphorinane with an alcohol to form a reaction product;
- and
- reacting the reaction product with elemental sulfur or an organic sulfur compound to form a 2-sulfide-1,3,2-dioxaphosphorinane.
1 more element
Dependencies are inferred from the claim text.