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US 6,407,043 B1Granted
Lubricating grease composition and preparation
AssigneeExxonMobil Research and Engineering Company
InventorSoenke Moehr
Life of this patent
Estimating the term…
Abstract
Greases having low noise properties are prepared by cycling kettle contents, during at least the initial stage of soap-forming or other thickening, round a processing loop comprising (i) agitation and heating and (ii) shearing. Lithium complex greases are referred to which have lower noise properties than a polyurea type grease.
Claims23
A lubricating grease composition comprising (i) a major amount by weight of a lubricating base oil;
- (ii) from 2 to 30wt % of a thickener selected from a simple soap, a complex soap, or polyurea;
- and (iii) 0-10 wt % of other additives characterised in that said composition has a small, uniform internal soap crystal particle size structure and a noise level below 3.5 μm/sec measured by Anderometry employing a SKF “BEQUIET” test rig MVH 90B.
A process of preparing a lubricating grease composition comprising (i) a major amount by weight of a lubricating base oil;
- (ii) from 2 to 30 wt % of a thickener selected from a simple soap, a complex soap, or polyurea;
- and (iii) 0-10 wt % of other additives, said method comprising:
- (a) agitating and heating a thickener forming component with at least a portion of the lubricating base oil in a closed reaction vessel over a continuing temperature gradient by range, and
- (b) cycling at least a portion of the contents of the reaction vessel over substantially the full thickening period round a pressure-ventable processing loop comprising (a) the said agitating and heating, and (c) shearing the forming thickener component by mechanical shearing means.
1 more element
Dependencies are inferred from the claim text.