Grease compositions
OwnerFrank Fiddelaers, Eustathios Ioannidesinventors
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Abstract
The invention relates to a grease composition having a base oil and a thickener that includes hydrophilic metal oxide particles and one or more esters which contain one or more unsaturated C—C bonds and/or at least one OH group. The hydrophilic metal oxide particles have a BET specific surface area of at least 10 m2/g and at least 80% of the hydrophilic metal oxide particles have a particle size in the range of from 5 nm to 900 μm. The amount of the thickener is in the range of from 0.1-40% by weight, based on the total weight of the grease composition. The invention further relates to methods for manufacturing the grease compositions, and the use of the grease compositions for lubricating bearings, gears and couplings.
Claims15
A grease composition comprising:
- a base oil, and
- a thickener that provides hydrophilic metal oxide particles and one or more esters which contain one or more unsaturated C—C bonds and/or at least one OH group, wherein
- the hydrophilic metal oxide particles have a BET specific surface area of at least 10 m2/g and at least 80% of the hydrophilic metal oxide particles have a particle size in the range of from 5 nm to 900 μm, and wherein
- the amount of the thickener is in the range of from 0.1-40% by weight, based on the total weight of the grease composition.
A method for manufacturing a grease composition having a base oil, and a thickener that provides hydrophilic metal oxide particles and one or more esters which contain one or more unsaturated C—C bonds and/or at least one OH group, wherein the hydrophilic metal oxide particles have a BET specific surface area of at least 10 m2/g and at least 80% of the hydrophilic metal oxide particles have a particle size in the range of from 5 nm to 900 μm, and wherein the amount of the thickener is in the range of from 0.1-40% by weight, based on the total weight of the grease composition, the method comprises:
- mixing the base oil, the hydrophilic metal oxide particles and the one or more esters that contain one or more unsaturated C—C bonds and /or at least one OH group in any possible order of sequence and
- subjecting before or after mixing the hydroxyl group containing metal compound, the one or more esters that contain one or more unsaturated C—C bonds and /or at least one OH group to a mechanical treatment, a thermal treatment or to both a mechanical treatment and a thermal treatment.
A grease composition having a base oil, and a thickener that provides hydrophilic metal oxide particles and one or more esters which contain one or more unsaturated C—C bonds and/or at least one OH group, wherein the hydrophilic metal oxide particles have a BET specific surface area of at least 10 m2/g and at least 80% of the hydrophilic metal oxide particles have a particle size in the range of from 5 nm to 900 μm, and wherein the amount of the thickener is in the range of from 0.1-40% by weight, based on the total weight of the grease composition used for lubricating a bearing, a gearing or a coupling.
Dependencies are inferred from the claim text.