Lubricant compositions containing an overbased amorphous alkaline earth metal salt as a metal protectant
AssigneeOMG Americas, Inc.
InventorsChester E. Ramey, James E. Reddy
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Abstract
Lubricant compositions are made containing, as a metal protectant additive, an overbased amorphous alkaline earth metal salt of fatty acid. The additive is added in either a liquid or powdered form to the base oil in the composition. The overbased additive in the lubricating composition serves as a metal protectant to provide detergency, friction-modifying and acid-neutralizing properties to the compositions.
Claims35
A lubricating oil composition comprising
- a lubricating oil and
- as a metal protectant, an additive selected from the group consisting of
- (a) a shelf stable haze free liquid of an overbased amorphous alkaline earth metal carbonate of a fatty acid and
- (b) a powdered overbased amorphous alkaline earth metal carbonate of a fatty acid isolated from said liquid, said liquid or powdered additive prepared according to the process of
- (i) reacting an alkaline earth metal base and a fatty acid with an equivalent ratio of metal base to fatty acid being greater than 1:1 in the presence of liquid hydrocarbon,
- (ii) carbonating the mixture to produce amorphous alkaline earth metal carbonate,
- (iii) adding during carbonation a dispersion of alkaline earth metal base, a liquid hydrocarbon and an aliphatic alcohol having at least 8 carbon atoms in relative amounts at a controlled rate of alkaline earth metal base addition to produce a stable haze free liquid reaction product, and
- (iv) removing water from the reaction product to obtain said liquid additive or powdered additive.
A lubricating oil composition comprising a lubricating oil and, as a metal protectant, an additive of a powdered overbased amorphous alkaline earth metal carbonate of a fatty acid consisting essentially of
- isolated solid agglomerated micelles of a complexed salt of an amorphous alkaline earth metal carbonate complexed with an amorphous alkaline earth metal carboxylate of a fatty acid.
Dependencies are inferred from the claim text.