Lubricating oil composition
View Patent ↗Lubricating composition comprising (i) base oil and (ii) a Verkade base compound having the formula (1): wherein R 1 , R 2 and R 3 are each independently selected from hydrogen and saturated or unsaturated, straight chain or branched, C 1 -C 22 alkyl groups. The lubricating composition of the present invention exhibits improved base number retention and oxidative stability, particularly in the presence of a biofuel such as fatty acid alkyl ester.
1. A lubricating composition comprising (I) base oil and (ii) compound having the formula (1):
wherein R1, R2 and R3 are each independently selected from hydrogen and saturated or unsaturated, straight chain or branched, C1-C22 alkyl groups.
2. The lubricating composition according to claim 1 wherein R1, R2 and R3 are each independently selected from saturated or unsaturated, straight chain or branched, C3-C12 alkyl groups.
3. The lubricating composition according to claim 1 wherein R1, R2 and R3 are each independently selected from saturated or unsaturated, branched chain C3-C12 alkyl groups.
4. The lubricating composition according to claim 1 wherein R1, R2 and R3 are each independently selected from saturated, branched chain C3-C12 alkyl groups.
5. The lubricating composition according to claim 1 wherein R1, R2 and R3 are each independently selected from saturated, branched chain C3-C6 alkyl groups.
6. The lubricating composition according to claim 1 wherein R1, R2 and R3 are the same.
7. The lubricating composition according to claim 6 wherein R1, R2 and R3 are saturated, branched chain C3 or C4 alkyl groups.
8. The lubricating composition according to claim 1 wherein the compound of formula (1) is present at a level of from 0.01 wt % to 5 wt %.
9. The lubricating oil composition according to claim 1 wherein the lubricating oil composition is contaminated with at least 0.3 wt %, based on the total weight of the lubricating oil composition, of a biofuel or a decomposition product thereof, or a mixture thereof.
10. The lubricating composition according to claim 1 wherein the base oil comprises a Fischer-Tropsch derived base oil.
11. The lubricating composition according to claim 1 additionally comprising a performance additive.
12. The lubricating composition according to claim 1 wherein the lubricating composition is a heavy-duty diesel engine oil.
13. A method for improving the base number retention of a lubricating oil composition used for lubricating a crankcase of an internal combustion engine fueled with a biofuel composition, wherein the biofuel composition is a biodiesel composition comprising a fatty acid alkyl ester, wherein the method comprises adding to the lubricating oil composition a compound of formula (1):
wherein R1, R2 and R3 are each independently selected from hydrogen and saturated or unsaturated, straight chain or branched, C1-C22 alkyl groups.
14. The lubricating composition according to claim 1 wherein the compound of formula (1) is present at a level of from 0.1 wt % to 3 wt %, by weight of the lubricating composition.
15. The lubricating composition according to claim 1 wherein the compound of formula (1) is present at a level of from 0.1 to 1 wt %, by weight of the lubricating composition.