Lithium complex grease thickener and high dropping point thickened grease
AssigneePennzoil Products Company
InventorGeorge P. Newsoroff
Life of this patent
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Abstract
A lithium complex grease thickener for increasing the dropping point of a lubricating oil comprises as primary indgredients a lithium salt of 12-hydroxystearic acid or from alkyl esters thereof and a dilithium salt derived from dialky esters of terephthalic acid in a molar proportion of about 0.5 to 15:1. A lithium complex thickened grease of high lubricating activity, shear stability, penetration, water resistance and dropping point comprises a major proportion of a lubricating oil and about 1 to 45 wt % of the lithium complex thickener of this invention with respect to the thickened grease.
Claims20
A lithium complex grease thickener for increasing the dropping point of a lubricating grease, comprising as primary ingredients
- a lithium salt of a first compound selected from the group consisting of 12-hydroxystearic acid and (C.sub.1 -C.sub.24) alkyl esters thereof;
- and
- a dilithium salt of a second compound consisting of di(C.sub.1 -C.sub.24) alkyl esters of terephthalic acid;
- the lithium salts of said first and second compounds being present in a molar proportion of about 0.5:1 to 15:1.
A lithium complex thickened grease of high lubricating activity, shear stability, penetration and dropping point comprising
- a major proportion of a lubricating oil;
- and
- about 1 to 45 wt % of a lithium complex thickener with respect to the thickened grease;
- said thickener comprising a lithium salt of a first compound selected from the group consisting of 12-hydroxystearic acid and (C.sub.1 -C.sub.24)alkyl esters thereof, and a dilithium salt of a second compound consisting of di(C.sub.1 -C.sub.24)alkyl esters of terephthalic acid;
- the lithium salts of said first and second compounds being present in a molar proportion of about 0.5:1 to 15:1.
A lithium complex thickened grease of high lubricating activity, shear stability, penetration and dropping points, comprising
- a lithium salt of a first compound selected from the group consisting of 12-hydroxystearic acid and (C.sub.1 -C.sub.24)alkyl esters thereof;
- a dilithium salt of a second compound consisting of di(C.sub.1 -C.sub.24)alkyl esters of terephthalic acid;
- the lithium salts of said first and second compounds being present in a molar proportion of about 0.5:1 to 15:1, and
- an additive selected from the group consisting of antioxidants or oxidation inhibitors, corrosion inhibitors, extreme pressure antiwear agents, fillers, tackiness agents, colorants and odor control agents.
A method of preparing a lithium complex thickened grease comprising
- contacting a lubricating oil and an about 1 to 45 wt % lithium complex thickener comprising as primary ingredients a lithium salt of a first compound selected from the group consisting of 12-hydroxystearic acid and (C.sub.1 -C.sub.24) alky esters thereof, and a dilithium salt of a second compound consisting of di(C.sub.1 -C.sub.24) alkyl esters of terephthalic acid, the lithium salts of said first and second compounds in a molar proportion thereof of about 0.5:1 to 15:1 with a portion of said lubricating oil of up to about 70 wt % of the total amount of oil in the grease at a dissolving temperature;
- adding a lithium base at said dissolving temperature in an about molar proportion to the sum of the amounts of said first and second compounds;
- increasing the temperature to about 350.degree. to 420.degree. F.;
- and
- admixing thereto the remainder amount of said oil to obtain said thickened grease.
Dependencies are inferred from the claim text.