Lubricant additive formulation containing multifunctional dispersant

1. A lubricating composition comprising:

(a) an oil of lubricating viscosity;

(b) a friction modifier;

(c) a corrosion inhibitor;

(d) an antiwear agent; and

(e) a product prepared comprising heating to react together:

(i) a dispersant;

(ii) 2,5-dimercapto-1,3,4-thiadiazole or a hydrocarbyl-substituted 2,5-di-mercapto-1,3,4-thiadiazole, or oligomers thereof;

(iii) a borating agent; and

(iv) terephthalic acid; and

(v) optionally a phosphorus acid compound,

said heating being at 80-200° C. to provide a product of (i), (ii), (iii) and (iv) and optionally (v), which is soluble in an oil of lubricating viscosity.

2. The lubricating composition of claim 1 , wherein the friction modifier comprises at least one of an amide of a hydroxyalkyl compound, a condensation product of a fatty acid and an amine, a borated glycerol ester, a fatty phosphite, a fatty acid amide, a fatty epoxide, a borated fatty epoxide, an alkoxylated fatty amine, a borated alkoxylated fatty amine, a metal salt of a fatty acid, a fatty imidazoline, an amine salt of an alkylphosphoric acid, a polyalkoxylated alcohol, or mixtures thereof.

3. The lubricating composition of claim 2 , wherein the friction modifier comprises a condensation product of a fatty acid and an amine.

4. The lubricating composition of claim 1 , wherein the friction modifier is present from 0.05 wt % to 10 wt % of the lubricating composition.

5. The lubricating composition of claim 1 , wherein the corrosion inhibitor comprises 2,5-dimercapto-1,3-4-thiadiazole or a hydrocarbyl-substituted 2,5-dimercapto-1,3-4-thiadiazole, or oligomers thereof.

6. The lubricating composition of claim 1 , wherein the corrosion inhibitor is present from 0.005 wt % to 5 wt % of the lubricating composition.

7. The lubricating composition of claim 1 , wherein the antiwear agent comprises a hydrocarbyl-substituted phosphite, a phosphorus-containing carboxylic ester, a phosphorus-containing carboxylic ether, a phosphorus-containing carboxylic amide, or mixtures thereof.

8. The lubricating composition of claim 7 , wherein the antiwear agent comprises a hydrocarbyl-substituted phosphite represented by the formula:

wherein R 1 and R 2 are independently hydrogen or hydrocarbyl groups, with the proviso that at least one of R 1 and R 2 is a hydrocarbyl group.

9. The lubricating composition of claim 1 , wherein the antiwear agent is present from 0.05 wt % to 10 wt % of the lubricating composition.

10. The lubricating composition of claim 1 , wherein the product (e) is present from 0.5 wt % to 15 wt % of the lubricating composition.

11. The lubricating composition of claim 1 , wherein the dispersant of (e) comprises a succinimide dispersant, a Mannich dispersant, an ester-containing dispersant, a condensation product of a fatty hydrocarbyl monocarboxylic acylating agent with an amine or ammonia, an alkyl amino phenol dispersant, a hydrocarbyl-amine dispersant, a polyether dispersant, a polyetheramine dispersant, a viscosity modifier containing dispersant functionality, or mixtures thereof.

12. The lubricating composition of claim 1 , wherein the borating agent of (e) comprises boric acid, boric oxide, boron trioxide, or an alkyl borate of the formula (RO) x B(OH) y , wherein x is 1 to 3 and y is 0 to 2 , the sum of x and y being 3 , and where R is an alkyl group containing 1 to 6 carbon atoms.

13. A lubricating composition comprising:

(a) 40 wt % to 99.4 wt % of an oil of lubricating viscosity;

(b) 0.05 wt % to 10 wt % of a friction modifier;

(c) 0.005 wt % to 5 wt % of a corrosion inhibitor;

(d) 0.05 wt % to 10 wt % of a hydrocarbyl-substituted phosphite antiwear agent; and

(e) 0.5 wt % to 15 wt % of a product prepared by heating to react together:

(i) a dispersant;

(ii) 2,5-dimercapto-1,3,4-thiadiazole or a hydrocarbyl-substituted 2,5-di-mercapto-1,3,4-thiadiazole, or oligomers thereof;

(iii) a borating agent; and

(iv) terephthalic acid,

said heating being at 80-200° C. to provide a product of (i), (ii), (iii) and (iv), which is soluble in an oil of lubricating viscosity.

14. A method for lubricating a mechanical device, comprising supplying thereto a lubricant comprising the lubricating composition of claim 1 .

15. The method of claim 14 , wherein the mechanical device comprises an automatic transmission, an automated manual transmission, a continuously variable transmission or a dual clutch transmission.

16. The method of claim 14 , wherein the mechanical device comprises gears or hydraulics.

17. A lubricating composition comprising:

(a) an oil of lubricating viscosity;

(b) a friction modifier;

(c) a corrosion inhibitor;

(d) an antiwear agent; and

(e) a product prepared comprising heating to react together:

(i) a dispersant, wherein the dispersant is selected from the group consisting of a succinimide dispersant, a Mannich dispersant, an ester-containing dispersant, a condensation product of a fatty hydrocarbyl monocarboxylic acylating agent with an amine or ammonia, an alkyl amino phenol dispersant, a hydrocarbylamine dispersant, a polyether dispersant, a polyetheramine dispersant, a viscosity modifier containing dispersant functionality, and mixtures thereof;

(ii) 2,5-dimercapto-1,3,4-thiadiazole or a hydrocarbyl-substituted 2,5-di-mercapto-1,3,4-thiadiazole, or oligomers thereof;

(iii) a borating agent; and

(iv) terephthalic acid; and

(v) optionally a phosphorus acid compound,

said heating being at 80-200° C. to provide a product of (i), (ii), (iii) and (iv) and optionally (v), which is soluble in an oil of lubricating viscosity.

18. A method for lubricating a mechanical device, comprising supplying thereto a lubricant comprising the lubricating composition of claim 1 , wherein the mechanical device comprises an automatic transmission, an automated manual transmission, a continuously variable transmission or a dual clutch transmission.