Low noise grease gelling agents
AssigneeChevron U.S.A. Inc.
InventorsCarl E. Ward, Carlos E. Littlefield
Life of this patent
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Abstract
The present invention relates to grease gelling agents and greases having low noise characteristics. The greases of the present invention may also exhibit good low shear stability and good heat resistance, as well as the low noise characteristics. The novel grease compositions of the present invention comprise a grease gelling agent comprises a mixture of ≧80 weight percent diureas and 0.1-20 weight percent polyureas.
Claims44
A grease gelling agent comprising a mixture of ≧80 weight % diureas and 0.1-20 weight % polyureas, wherein the diureas and polyureas are formed by reaction of (a) an alkylamine or alkenylamine;
- (b) an alkylenediamine, polyoxyalkylenediamine, or cycloalkylenediamine;
- (c) a cycloalkylamine;
- and (d) an aryl-containing-diisocyante or alkyldiisocyanate.
A grease gelling agent comprising a mixture of diureas of formulas I, II, and III,
- and polyureas of formula IV,
- wherein:
- R1 is cHx or Oleyl;
- and
- n is an integer from 1 to 10;
- wherein:
- the grease gelling agent is comprised of ≧80 weight % of diureas of formulas I, II, and III and 0.1-20 weight % of polyureas of formula IV;
- and
- the diureas of formulas I, II, and III are comprised of ≧60 weight % of diurea of formula I, 10-40 weight % of diurea of formula II, and 1-10 weight % of diurea of formula III.
A grease comprising a lubricant base oil and a grease gelling agent comprising a mixture of ≧80 weight % diureas and 0.1-20 weight % polyureas, wherein the diureas and polyureas are formed by reaction of (a) an alkylamine or alkenylamine;
- (b) an alkylenediamine, polyoxyalkylenediamine, or cycloalkylenediamine;
- (c) a cycloalkylamine;
- and (d) an aryl-containing-diisocyante or alkyldiisocyanate.
A grease composition comprising:
- (a) a lubricant base oil;
- and
- (b) a grease gelling agent comprising:
- (i) a mixture of diureas of formulas I, II, and III,
- and polyureas of formula IV,
- wherein
- R1 is cHx or Oleyl;
- and
- n is an integer from 1 to 10;
- wherein
- the grease gelling agent is comprised of ≧80 weight % of diureas of formulas I, II, and III and 0.1-20 weight % of polyureas of formula IV;
- and
- the diureas of formulas I, II, and III are comprised of ≧60 weight % of diurea of formula I, 10-40 weight % of diurea of formula II, and 1-10 weight % of diurea of formula III.
A method for making a grease comprising the steps of:
- a) reacting an alkylamine or alkenylamine;
- an alkylenediamine, polyoxyalkylenediamine, or cycloalkylenediamine;
- a cycloalkylamine;
- and an aryl-containing-diisocyante or alkyldiisocyanate in lubricant base oil;
- and
- b) recovering the grease.
Dependencies are inferred from the claim text.