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US 10,752,859 B2Granted
Grease composition
AssigneeShell Oil Company
InventorsEdward Alexander Worthington, Alan Richard Wheatley
Life of this patent
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Abstract
A grease composition comprises a base oil and an aluminium complex soap thickener, with graphite, molybdenum di-sulphide, calcium carbonate and bismuth sulphide all included as additives. The composition exhibits advantageous load, wear and friction performance, especially in extreme pressure environments, and is particularly suitable for use on open gears.
Claims16
A grease composition comprising from 30 to 90 wt. % of a base oil, based upon the total weight of the grease composition;
- and
- an aluminum complex soap as a thickening agent, and wherein the aluminum complex soap comprises at least a long chain aliphatic acid having 12-25 carbon atoms and an aromatic carboxylic acid having 10 or fewer carbon atoms;
- wherein the composition further includes as additives (i) from 1 to 15 wt. % graphite based upon the total weight of the grease composition, (ii) from 1 to 15 wt. % molybdenum disulphide of a 98% or greater purity based upon the total weight of the grease composition, (iii) from 1 to 15 wt. % calcium carbonate based upon the total weight of the grease composition and (iv) from 0.1 to 15 wt. % bismuth sulphide based upon the total weight of the grease composition;
- and
- wherein the base oil comprises polybutene in an amount of from 20 wt. % to 50 wt. %, based upon the total weight of the grease composition.
2 more elements
Dependencies are inferred from the claim text.