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US 4,536,308 AGranted
Lithium soap grease additive
AssigneeTexaco Inc.
InventorsRebecca C. C. Pehler, James R. Whiteman, Arnold C. Witte, Jr.
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AssigneeTexaco Inc.
InventorsRebecca C. C. Pehler, James R. Whiteman, Arnold C. Witte, Jr.
Estimating the term…
An experimental grease has been formulated with 8.5 wt % lithium 12-hydroxystearate in a base oil containing an additive composition of a synergistic blend of zinc dialkyldithiophosphates, zinc diamyldithiocarbamate, aromatic amine phosphate, sulfurized sperm oil substitute and the reaction product of coconut oil and diethanolamine. The lithium 12-hydroxystearate grease has been prepared by a standard kettle procedure. The grease composition exhibits a dropping point in the range expected of a lithium complex grease. The grease keeps its soap fiber structure intact at 390.degree. to 400.degree. F., typical of the melting range of lithium 12-hydroxystearate greases. The grease is useful for its long life in constant velocity joints.
A grease composition comprising a major portion of a mineral lubricating oil, a grease thickening amount of lithium 12-hydroxystearate and an effective amount of an additive composition, basis the grease composition said additive composition consisting of 4 to 8 wt % sulfurized sperm oil substitute, 0.5 to 2.0 wt % of the reaction product of coconut oil and diethanolamine, 2.4 to 5.0 wt % of zinc dialkyldithiophosphate, 0.5 to 2.0 wt % zinc diamyldithiocarbamate and 0.5 to 1.0 wt % aromatic amine phosphate.
A grease additive composition comprising 40 to 55 wt % sulfurized sperm oil substitute, 6 to 12 wt % of the reaction product of coconut oil and diethanolamine, 25 to 35 wt % of zinc dialkyldithiophosphate, 6 to 12 wt % zinc diamyldithiocarbamate and 6 to 12 wt % aromatic amine phosphate.
Dependencies are inferred from the claim text.