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US 11,873,461 B1Granted
Extreme pressure additives with improved copper corrosion
AssigneeAfton Chemical Corporation
InventorsDavid Edwards, LeAnna Hobbs, Magdalena Makowska, Jon Jacoby
Life of this patent
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Abstract
A sulfurized extreme pressure additive and lubricant including the same providing good copper corrosion and seal compatibility.
Claims22
A sulfurized polyolefin oligomer made by a process comprising the steps of:
- (a) reacting a C2 to C18 olefin with a sulfur halide to form an intermediate sulfurized olefin reaction product;
- (b) reacting the intermediate sulfurized olefin reaction product with an alkali metal hydrosulfide, an alkali metal hydroxide, and sulfur in an aqueous solution to form a sulfurized polyolefin reaction product;
- (c) treating the sulfurized polyolefin reaction product with an aqueous alkaline solution for a time and a temperature effective to form the sulfurized polyolefin oligomer;
- and
- wherein the aqueous alkaline solution is about 40 to about 60 weight percent of an alkali metal hydroxide and being free of alcohols or ketones.
2 more elements
A lubricating composition including a major amount of base oil selected from an API Group I to API Group V base oil and a minor amount of a sulfurized polyolefin oligomer, wherein the sulfurized polyolefin oligomer is made by a process comprising the steps of:
- (a) reacting a C2 to C18 olefin with a sulfur halide to form an intermediate sulfurized olefin reaction product;
- (b) reacting the intermediate sulfurized olefin reaction product with an alkali metal hydrosulfide, an alkali metal hydroxide, and sulfur in an aqueous solution to form a sulfurized polyolefin reaction product;
- and
- (c) treating the sulfurized polyolefin reaction product with an aqueous alkaline solution for a time and a temperature effective to form the sulfurized polyolefin oligomer;
- and
- wherein the aqueous alkaline solution is about 40 to about 60 weight percent of an alkali metal hydroxide and being free of alcohols or ketones.
3 more elements
Dependencies are inferred from the claim text.