Stabilized blends containing friction modifiers
AssigneeThe Lubrizol Corporation
InventorsStuart L. Bartley, Patrick E. Mosier, James D. Burrington, David C. Arters
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Abstract
The present invention relates to functional fluid compositions containing friction modifiers, and specifically stable compositions containing friction modifiers with limited solubility in and/or limited compatibility with the functional fluids with which they are used. In particular the present invention deals with functional fluids used in internal combustion engines, such as engine oils, and friction modifiers derived from hydroxy-carboxylic acids, where the friction modifier is present in the functional fluid composition at levels that would otherwise cause the composition to be unstable and/or hazy.
Claims9
A composition comprising:
- (a) a medium comprising a solvent, a functional fluid, an additive concentrate or combinations thereof;
- and
- (b) a friction modifier component comprising a derivative of a hydroxy-carboxylic acid, which comprises an imide, di-ester, di-amide, or ester-amide derivative of tartaric acid, citric acid, or mixtures thereof, in an amount of more than 0.5 and up to about 3 weight percent such that it is not fully soluble in the medium;
- and
- (c) a stabilizing component that is soluble in (a) and that interacts with (b) such that (b)'s solubility in (a) is improved, said stabilizing component comprising:
- about 2 to about 4 weight percent of a poly(hydroxycarboxylic acid) amide salt derivative represented by the formula [Y—CO[O-A-CO]n—Zr—R+]mpXq− wherein Y is hydrogen, a hydrocarbyl group or a substituted hydrocarbyl group, A is a divalent hydrocarbyl group, n is from 1 to 100, m is from 1 to 4, q is from 1 to 4 and p is an integer such that pq=m, Z is a divalent bridging group which is attached to the carbonyl group through a nitrogen atom, r is 1, R+ is an ammonium group and Xq− is an anion;
- wherein the poly(hydroxycarboxyl acid) is a condensation product of 12-hydroxystearic acid, ricinoleic acid, 12-hydroxy dodecanoic acid, 5-hydroxy dodecanoic acid, 5-hydroxy decanoic acid, 4-hydroxy decanoic acid, 10-hydroxy undecanoic acid or combinations thereof and the —Zr—R+ group is —NH-alkylene-N+(alkyl)3;
- wherein components (b) and (c), or (b) alone, are present in component (a) in the form of dispersed particles having an average diameter of less than 10 microns.
A process of preparing a clear and stable composition comprising:
- (a) a medium comprising a solvent, a functional fluid, an additive concentrate, or combinations thereof;
- and
- (b) a friction modifier component comprising a derivative of a hydroxy-carboxylic acid which comprises an imide, di-ester, di-amide, or ester-amide derivative of tartaric acid, citric acid, or mixtures thereof, in an amount-such that it is not fully soluble in the medium;
- and
- (c) about 2 to about 4 weight percent of a stabilizing component that is soluble in (a) and that interacts with (b) such that (b)'s solubility in (a) is improved;
- said method comprising the steps of:
- I. adding components (b) and (c) to component (a) wherein component (b) is present in the overall composition at a level of more than 0.5 and up to about 3 percent by weight;
- II. mixing the components so that components (b) are present in component (a) in the form of dispersed particles having an average diameter of less than 10 microns;
- and
- said stabilizing component comprising:
- a poly(hydroxycarboxylic acid) amide salt derivative represented by the formula [Y—CO[O-A-CO]n—Zr—R+]mpXq− wherein Y is hydrogen, a hydrocarbyl group or a substituted hydrocarbyl group, A is a divalent hydrocarbyl group, n is from 1 to 100, m is from 1 to 4, q is from 1 to 4 and p is an integer such that pq=m, Z is a divalent bridging group which is attached to the carbonyl group through a nitrogen atom, r is 0 or 1, R+ is an ammonium group and Xq− is an anion wherein the poly(hydroxycarboxyl acid) is a condensation product of 12-hydroxystearic acid, ricinoleic acid, 12-hydroxy dodecanoic acid, 5-hydroxy decanoic acid, 5-hydroxy decanoic acid, 4-hydroxy decanoic acid, 10-hydroxy undecanoic acid, or combinations thereof and the —Zr—R+ group is —NH-alkylene-N+(alkyl)3.
Dependencies are inferred from the claim text.