Grease composition
AssigneeChevron Research Company
InventorJeffrey E. Stemke
Life of this patent
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Abstract
Disclosed is a polyurea-thickened grease containing a polymeric material which improves the low shear stability of the grease.
Claims9
A grease composition comprising a major amount of a lubricating oil, a polyurea gellant in an amount sufficient to thicken the lubricating oil to grease consistency, and an effective amount in the range of 0.1 to 20 weight percent to improve the low shear stability of the polyurea thickened grease of a polymer having a pKa value greater than 5.0, said polyurea gellant having the following formula:
- ##STR4## wherein x is a number having a value from 1 to 3, R' and R" are hydrocarbon radicals containing from 1 to 30 carbon atoms, R and R"' are hydrocarbon radicals containing from 2 to 30 carbon atoms, wherein the ratio of carbon atoms to the number of urea groups is at least 6:1.
A grease composition comprising a major amount of a lubricating oil, a polyurea gellant in an amount sufficient to thicken the lubricating oil to grease consistency, and an effective amount in the range of 0.1 to 20 weight percent to improve the low shear stability of the polyurea thickened grease of a polymer having a pKa value greater than 5.0, said polyurea gellant having the following formula:
- ##STR5## wherein x is a number having a value from 1 to 3;
- R.sup.a and R.sup.d are hydrocarbyl of from 5 to 28 carbon atoms, and R.sup.b and R.sup.c are hydrocarbylene of from 2 to 26 carbon atoms, wherein the ratio of carbon atoms to the number of urea groups is at least about 6:1.
Dependencies are inferred from the claim text.