Sulfide- and polysulfide-containing lubricating oil additive compositions and lubricating compositions containing the same
AssigneeExxonMobil Chemical Patents Inc.
InventorsWilliam T. Sullivan, Percy Rohinton Kanga, Thomas Smith Coolbaugh
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Abstract
This invention relates to a lubricating composition comprising a major amount of an oil of lubricating viscosity, at least one organic polysulfide comprising less than about 88% dihydrocarbyl trisulfide, from up to about 5% dihydrocarbyl disulfide, and more than about 7 wt. % dihydrocarbyl higher polysulfides, and at least one phosphorus or boron compound, or mixtures of two or more thereof. The invention also relates to concentrates and greases containing the above combination. The invention also relates to methods of making the organic polysulfide.
Claims16
A lubricating composition comprising:
- a major amount of an oil of a lubricating viscosity,
- at least one organic polysulfide comprising less than 88% dihydrocarbyl trisulfide;
- and
- a phosphorus compound or a boron compound, or mixtures thereof.
A lubricating composition comprising:
- a major amount of an oil of lubricating viscosity;
- at least one dihydrocarbyl polysulfide comprising:
- (i) less than 88% dihydrocarbyl trisulfide;
- (ii) less than 5.5 wt. % dihydrocarbyl disulfide;
- and
- (iii) at least 7.5 wt. % dihydrocarbyl tetrasulfide or higher polysulfides;
- and
- a phosphorus compound or a boron compound, or mixtures thereof.
A concentrate comprising from 0.1% to 49.9% by weight of a substantially inert, organic diluent based on the total weight of the concentrate;
- at least one dihydrocarbyl polysulfide comprising less than about 88% dihydrocarbyl trisulfide;
- less than 5.5 wt. % dihydrocarbyl disulfide;
- at least 7.5 wt. % dihydrocarbyl tetrasulfide or higher polysulfides;
- and
- at least one phosphorus or boron compound or mixtures thereof.
A grease composition comprising at least one oil of a lubricating viscosity,
- at least one thickening agent;
- at least one dihydrocarbyl polysulfide comprising less than 88% dihydrocarbyl trisulfide;
- less than 5.5 wt. % dihydrocarbyl disulfide;
- at least 7.5 wt. % dihydrocarbyl tetrasulfide or higher polysulfides;
- and
- at least one phosphorus or boron compound, or mixtures thereof.
A method of lubricating at least one contact surfaces to reduce friction, the method comprising the steps of:
- introducing to at least one contact surface a lubricating composition comprising:
- a major amount of an oil of lubricating viscosity;
- at least one organic polysulfide comprising less than 88% dihydrocarbyl trisulfide;
- less than 5.5 wt. % dihydrocarbyl disulfide;
- at least 7.5 wt. % dihydrocarbyl tetrasulfide or higher polysulfides;
- and
- at least one phosphorus or boron compound, or mixtures thereof.
An additive package for a lubricant composition, the additive package comprising:
- at least one organic polysulfide comprising less than 88% dihydrocarbyl trisulfide;
- at least one phosphorus or boron compound, or mixtures thereof;
- a primary amine;
- a metal passivator;
- a diluent oil;
- and
- a defoamant.
Dependencies are inferred from the claim text.