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OwnerPierre Belot, Jean-Marie Pinocheinventors
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A subject of the invention is a lubricating grease, characterized in that it contains: from 70 to 95% by weight of a mixture comprising at least a first ester of fatty acid and of sorbitan and at least a second ester of fatty acid and of polyoxyalkylated sorbitan, these esters being present in quantities by weight, relative to the weight of the said mixture, of 10 to 90% and 90 to 10%, respectively; and from 5 to 30% by weight of at least one thickening agent. A subject of the invention is also a preparation process for a grease according to the invention, as well as use as a lubricant of such a grease. A subject of the invention is also a vehicle wheel containing a grease according to the invention.
Lubricating grease, characterized in that it contains:
Grease according to any one of the previous claims, characterized in that the quantities by weight in the mixture of each of the two types of esters are more or less equal.
Grease according to any one of the previous claims, characterized in that said first and second esters are chosen in such a way that the mixture of the two types of esters is liquid at 25° C. and atmospheric pressure.
Grease according to any one of the previous claims, characterized in that the fatty acids featuring in the composition of said first and second esters contain from 6 to 18 carbon atoms, and preferably from 12 to 18 carbon atoms.
Grease according to the previous claim, characterized in that the fatty acids featuring in the composition of the said first and second esters are chosen from lauric, palmitic, stearic, oleic acids.
Grease according to any one of the previous claims, characterized in that the polyoxyalkyl groups present in the said second ester contain at least one polyethoxy group.
Grease according to any one of the previous claims, characterized in that the said first ester comprises sorbitan monooleate.
Grease according to any one of the previous claims, characterized in that the said second ester comprises polyethoxylated sorbitan monooleate.
Grease according to any one of the previous claims, characterized in that the thickening agent contains at least a clay grafted by organic groups.
Grease according to the previous claim, characterized in that the said clay is bentonite.
Grease according to the previous claim, characterized in that it contains from 0.5 to 2% by weight of an adjuvant, the function of which is to increase the thickening power of the silica.
Grease according to the previous claim, characterized in that the adjuvant is chosen from water, glycerol, ethylene glycerol, glycol, ethylene glycol.
Grease according to any one of the previous claims, characterized in that its thickening agent content is between 10 and 20% by weight.
Grease according to any one of the previous claims, characterized in that it contains 0.25 to 1.5% by weight of an antioxidant additive.
Grease according to any one of the previous claims, characterized in that its cone penetrability is between 265 and 340 {fraction (1/10)}th mm.
Dependencies are inferred from the claim text.