Lubricating compositions, concentrates, and greases containing the combination of an organic polysulfide and an overbased composition or a phosphorus or boron compound
AssigneeThe Lubrizol Corporation
InventorsJames J. Schwind, Ross L. Beebe
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Abstract
This invention relates to a lubricating composition comprising a major amount of an oil of lubricating viscosity, (A) at least one organic polysulfide comprising at least about 90% dihydrocarbyl trisulfide, from about 0.1% up to about 8% dihydrocarbyl disulfide, and less than about 5% dihydrocarbyl higher polysulfides, and (B) at least one overbased metal composition, 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.
Claims30
A method of preparing a lubricating oil composition, comprising:
- (1) preparing an intermediate product by reacting isobutylene, or a dimer, trimer or tetramer of isobutylene, or a mixture thereof, with sulfur and hydrogen sulfide;
- (2) fractionating the intermediate product from step (1) at a subatmospheric pressure in the range of about 1 to about 250 mmHg and a reflux ratio in the range of about 1:1 to about 15:1 to provide a dihydrocarbyl polysulfide mixture comprising at least about 90% dihydrocarbyl trisulfide, from about 0.1 to about 8% dihydrocarbyl disulfide, and less than about 5% dihydrocarbyl higher polysulfides;
- and
- (3) blending a mixture comprising a major amount of an oil of lubricating viscosity, (A) the product from step (2), and (B) at least one overbased metal composition or a phosphorus or boron compound, or mixtures thereof.
A method of preparing a lubricating oil composition, comprising:
- (1) preparing an intermediate product by reacting isobutylene, or a dimer, trimer or tetramer of isobutylene, or a mixture thereof, with sulfur and hydrogen sulfide;
- (2) fractionating the intermediate product from step (1) at a subatmospheric pressure in the range of about 1 to about 250 mmHg and a reflux ratio in the range of about 1:1 to about 15:1 to provide a dihydrocarbyl polysulfide mixture comprising at least about 90% dihydrocarbyl trisulfide, from about 0.1 to about 8% dihydrocarbyl disulfide, and less than about 5% dihydrocarbyl higher polysulfides;
- and
- (3) blending a major amount of an oil of lubricating viscosity, (A) from about 2% up to about 8% by weight of the polysulfide mixture from step (2), and (B) from about 0.1% up to about 8% by weight of at least one compound selected from the group consisting of an overbased composition, a phosphoric acid ester or salt thereof, a phosphite, a reaction product of a phosphite and sulfur or a source of sulfur, and a borated dispersant.
A method of preparing a concentrate, comprising:
- (1) preparing an intermediate product by reacting isobutylene, or a dimer, trimer or tetramer of isobutylene, or a mixture thereof, with sulfur and hydrogen sulfide;
- (2) fractionating the intermediate product from step (1) at a subatmospheric pressure in the range of about 1 to about 250 mmHg and a reflux ratio in the range of about 1:1 to about 15:1 to provide a dihydrocarbyl polysulfide mixture comprising at least about 90% dihydrocarbyl trisulfide, from about 0.1 to about 8% dihydrocarbyl disulfide, and less than about 5% dihydrocarbyl higher polysulfides;
- and
- (3) blending a mixture comprising from 0.01% to about 49.9% by weight of a substantially inert organic diluent, (A) the dihydrocarbyl polysulfide mixture from step (2), and (B) at least one overbased metal composition or a phosphorus or boron compound.
Dependencies are inferred from the claim text.