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US 6,281,174 B1Granted
Method to improve Cu corrosion performance of Mo-DTC and active sulfur by adding sunflower oil
AssigneeThe Lubrizol Corporation
InventorJunsuke Haruna
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Abstract
Lubricating compositions are described which contain organomolybdenum compounds and sulfur compounds (donors). The copper corrosion of said compositions is reduced by reacting the sulfur donors with plant oils to reduce sulfur activity and thus copper corrosion prior to the sulfur donors being added to the majority of oil to form a lubricating composition.
Claims8
A lubricating composition containing organomolybdenum compounds and having reduced copper corrosion properties;
- said composition comprising:
- a mixture formed by mixing together
- (A) a majority of an oil of lubricating viscosity;
- (B) an organomolybdenum compound;
- (C) a sulfur containing compound;
- (D) a plant oil;
- wherein (C) and (D) prior to addition to said mixture are mixed together and heated at time and temperature parameters sufficient to react the unbound sulfur of said sulfur containing compound with the plant oil.
4 more elements
An additive composition for use in a majority of an oil of lubricating viscosity, said composition comprising:
- (A) an organomolybdenum compound;
- (B) a sulfur containing compound;
- (C) a plant oil;
- wherein (B) and (C) prior to mixing with said organomolybdenum compound (A) are mixed together and heated at time and temperature parameters sufficient to react unbound sulfur of said sulfur containing compound with the plant oil wherein said oil containing said composition has reduced copper corrosion properties.
1 more element
Dependencies are inferred from the claim text.