Additive concentrates for the formulation of lubricating oil compositions

1. A lubricant additive concentrate comprising:

(i) dispersant that is the polybutenyl succinimide reaction product of a polyamine and polybutenyl succinic anhydride (PIBSA) having a functionality of from about 1.3 to about 2.2, derived from polybutene having a number average molecular weight (M n ) of from about 1300 to about 2500 daltons and a terminal vinylidene content of at least about 50% and maleic anhydride via an ene maleation process;

(ii) overbased magnesium colloidal detergent having a total base number (TBN) of from about 300 to about 900 mg KOH/g; and

(iii) organic friction modifier comprising organic friction modifier selected from

at least one hydroxyalkyl alkyl amines of C 14 to C 24 hydrocarbons,

at least one hydroxyalkyl alkyl ether amines of C 13 to C 24 hydrocarbons,

at least one alkyl ester amine derived from triethanol amine having a C 13 to C 24 hydrocarbyl substituent,

at least one non-basic, fatty acid amide, or a mixture thereof;

wherein:

a) the combined mass % of dispersant (i) and overbased magnesium colloidal detergent (ii) in said concentrate is from about 15 to about 50 mass %;

b) the mass ratio of (i):(ii) is from about 1:1 to about 6:1; and

c) said concentrate contains from about 2 mass % to about 10 mass % of organic friction modifier (iii);

d) the remainder of the concentrate comprising base oil and additives other than dispersant (i), overbased magnesium colloidal detergent (ii) and organic friction modifier (iii); and

e) said lubricant additive concentrate has a sediment content of no greater than 0.05 mass %, based on the total mass of the concentrate after 12 weeks of storage at 60° C.

2. A lubricant additive concentrate of claim 1 , wherein dispersant (i) is derived from polybutene having a molecular weight distribution (MWD) of from about 1.2 to about 3.0.

3. A lubricant additive concentrate of claim 1 , wherein said overbased magnesium colloidal detergent (ii) is derived from one or more surfactants selected from (a) sulfonate; (b) phenate; and (c) hydroxy benzoate surfactants.

4. A lubricant additive concentrate of claim 3 , wherein said overbased magnesium colloidal detergent (ii) is derived from two or more different surfactants.

5. A lubricant additive concentrate of claim 1 , comprising a mixture of magnesium and calcium detergents.

6. A lubricant additive concentrate of claim 1 , comprising a mixture of organic friction modifier (iii) and organic friction modifier other than (iii).

7. A lubricant additive concentrate of claim 1 , wherein the total concentration of organic friction modifier in the concentrate is from about 4 mass % to about 10 mass %.

8. A lubricant additive concentrate of claim 6 , wherein the total concentration of organic friction modifier in the concentrate is from about 4 mass % to about 10 mass %.

9. A lubricant additive concentrate of claim 1 , further comprising a low molecular weight hydrocarbyl or hydrocarbenyl substituted succinimide or succinic anhydride compatibility aid, derived from a hydrocarbyl or hydrocarbenyl group having a number average molecular weight (M n ) of from about 150 to about 1200 daltons.

10. A lubricant additive concentrate of claim 9 , comprising from about 0.25 mass % to about 8 mass % of said compatibility aid.

11. A lubricant additive concentrate of claim 10 , wherein said compatibility aid is octadecenyl succinic anhydride (ODSA), or polyisobutenyl succinic anhydride (PIBSA), or a mixture thereof.

12. The lubricant additive concentrate of claim 1 , further comprising at least one additional additive selected from the group consisting of zinc-phosphorus antiwear agents, molybdenum-containing antiwear agents and/or friction modifiers, antioxidants, viscosity modifiers and pour point depressants.

13. The lubricant of claim 6 , wherein the organic friction modifier other than (iii) is a glyceryl monoester of higher fatty acids; alkylated tartaric acid derivative; esters of long chain polycarboxylic acid with diols; or an oxazoline compound.

14. The lubricant additive concentrate of claim 9 , where the compatibility aid to be added to the lubricant additive concentrate is not introduced into the concentrate without the detergent being present.

15. The lubricant additive concentrate of claim 1 , where the dispersant is not borated.

16. The lubricant additive concentrate of claim 3 , where the overbased magnesium colloidal detergent(s) comprises detergent(s) derived from one or more salicylate surfactants.

17. A lubricant additive concentrate comprising:

(i) dispersant that is the polybutenyl succinimide reaction product of a polyamine and polybutenyl succinic anhydride (PIBSA) having a functionality of from about 1.3 to about 2.2, derived from polybutene having a number average molecular weight (M n ) of from about 1300 to about 2500 daltons and a terminal vinylidene content of at least about 50% and maleic anhydride via an ene maleation process;

(ii) overbased magnesium colloidal detergent having a total base number (TBN) of from about 300 to about 900 mg KOH/g;

(iii) organic friction modifier comprising organic friction modifier selected from:

at least one hydroxyalkyl alkyl amines of C 14 to C 24 hydrocarbons,

at least one hydroxyalkyl alkyl ether amines of C 13 to C 24 hydrocarbons,

at least one alkyl ester amine derived from triethanol amine having a C 13 to C 24 hydrocarbyl substituent,

at least one non-basic, fatty acid amide, or a mixture thereof; and

(iv) glycerol mono-oleate;

wherein:

a) the combined mass % of dispersant (i) and overbased magnesium colloidal detergent (ii) in said concentrate is from about 15 to about 50 mass %;

b) the mass ratio of (i):(ii) is from about 1:1 to about 6:1;

c) said concentrate contains from about 2 mass % to about 10 mass % of organic friction modifier (iii);

d) the remainder of the concentrate comprises base oil and additives other than dispersant (i), overbased magnesium colloidal detergent (ii) and organic friction modifier (iii);

e) the total concentration of mixture of organic friction modifier (iii), glycerol mono-oleate, and organic friction modifier other than (iii) in the concentrate is from about 4 mass % to about 10 mass %; and

f) said lubricant additive concentrate has a sediment content of no greater than 0.05 mass %, based on the total mass of the concentrate after 12 weeks of storage at 60° C.

18. A lubricant additive concentrate comprising:

(i) dispersant that is the polybutenyl succinimide reaction product of a polyamine and polybutenyl succinic anhydride (PIBSA) having a functionality of from about 1.3 to about 2.2, derived from polybutene having a number average molecular weight (M n ) of from about 1300 to about 2500 daltons and a terminal vinylidene content of at least about 50% and maleic anhydride via an ene maleation process;

(ii) overbased magnesium colloidal detergent having a total base number (TBN) of from about 300 to about 900 mg KOH/g;

(iii) organic friction modifier comprising organic friction modifier selected from:

at least one hydroxyalkyl alkyl amines of C 14 to C 24 hydrocarbons,

at least one hydroxyalkyl alkyl ether amines of C 13 to C 24 hydrocarbons,

at least one alkyl ester amine derived from triethanol amine having a C 13 to C 24 hydrocarbyl substituent,

at least one non-basic, fatty acid amide, or a mixture thereof;

(iv) glycerol mono-oleate; and

(v) natural diluent oil selected having a kinematic viscosity at 100° C. of about 2 to about 40 mm 2 /sec;

wherein:

a) the combined mass % of dispersant (i) and overbased magnesium colloidal detergent (ii) in said concentrate is from about 15 to about 50 mass %;

b) the mass ratio of (i):(ii) is from about 1:1 to about 6:1;

c) said concentrate contains from about 2 mass % to about 10 mass % of organic friction modifier (iii);

d) the remainder of the concentrate comprises base oil and additives other than dispersant (i), overbased magnesium colloidal detergent (ii) and organic friction modifier (iii);

e) the total concentration of mixture of organic friction modifier (iii), glycerol molo-oleate, and organic friction modifier other than (iii) in the concentrate is from about 4 mass % to about 10 mass %; and

f) said lubricant additive concentrate has a sediment content of no greater than 0.05 mass %, based on the total mass of the concentrate after 12 weeks of storage at 60° C.

19. The lubricant additive concentrate of claim 18 , wherein the natural diluent oil is selected from animal oils, vegetable oils, liquid petroleum oils, and hydrorefined, solvent-treated, or acid-treated mineral oils of the paraffinic, naphthenic and mixed paraffinic-naphthenic types.