High Viscosity Novel Base Stock Lubricant Viscosity Blends

• US 20110136714A1
• Filed: 10/27/2010
• Published: 06/09/2011
• Est. Priority Date: 06/06/2006
• Status: Active Grant

• Current Assignee: ExxonMobil Research & Engineering Company (Exxon Mobil Corporation)
• Original Assignee: ExxonMobil Research & Engineering Company (Exxon Mobil Corporation)
• Inventors: Carey, James T., Wardlow, Andrea B., Galiano-Roth, Angela S., Wu, Margaret M., Haigh, Heather M.
• Granted Patent: US 8,501,675 B2
• Time in Patent Office: Days
• US Class Current: 508/583
• CPC Class Codes: C10M 107/10 containing aliphatic monomer having more than 4 carbon atoms
• CPC Class Codes: C10M 111/04 at least one of them being a macromolecular organic compound
• CPC Class Codes: C10M 171/02 Specified values of viscosity or viscosity index
• CPC Class Codes: C10M 2203/06 Well-defined aromatic compounds
• CPC Class Codes: C10M 2203/065 used as base material
• CPC Class Codes: C10M 2203/104 Aromatic fractions
• CPC Class Codes: C10M 2203/1085 used as base material
• CPC Class Codes: C10M 2205/0206 used as base material
• CPC Class Codes: C10M 2205/0265 used as base material
• CPC Class Codes: C10M 2205/028 containing aliphatic monomers having more than four carbon atoms
• CPC Class Codes: C10M 2205/0285 used as base material
• CPC Class Codes: C10M 2205/163 used as base material
• CPC Class Codes: C10M 2205/173 used as base material
• CPC Class Codes: C10M 2207/2825 used as base material
• CPC Class Codes: C10M 2207/283 of polyhydroxy compounds
• CPC Class Codes: C10M 2207/2835 used as base material
• CPC Class Codes: C10M 2207/285 of aromatic polycarboxylic acids
• CPC Class Codes: C10M 2207/2855 used as base material
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2020/04 Molecular weight; Molecular weight distribution
• CPC Class Codes: C10N 2030/02 : Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/06 : Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/08 : Resistance to extreme temperature
• CPC Class Codes: C10N 2030/10 : Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2030/18 : Anti-foaming property
• CPC Class Codes: C10N 2030/26 : Waterproofing or water resistance
• CPC Class Codes: C10N 2030/66 : Hydrolytic stability
• CPC Class Codes: C10N 2030/68 : Shear stability
• CPC Class Codes: C10N 2040/04 : Oil-bath; Gear-boxes; Automatic transmissions; Traction drives

Abstract

A lubricant formulation and method of blending a lubricant formulation is disclosed. The lubricant formulation comprises at least two base stocks. The first base stock comprises a viscosity greater than 135 cSt, Kv100° C. and a tight molecular weight distribution as a function of viscosity. The second base stock comprises a viscosity less than 60 cSt, Kv100° C. The formulation also comprises a polyol ester. The lubricant formulation provides favorable properties.

Claims

1. A lubricating oil formulation prepared from a blend of components comprised of:

at least 19.7 wt % PAO having a viscosity of at least 135 cSt, Kv 100°

C., based on total weight of the blend components of the formulation;

less than or equal to 70 wt % PAO having a viscosity of not greater than 40 cSt, Kv 100°

C., based on total weight of the blend components of the formulation; and

at least one Group V basestock.

2. The lubricating oil formulation of claim 1, wherein the first PAO basestock having a viscosity of at least 135 cSt, Kv 100°

C., has a MWD of not greater than 2.35.

3. The lubricating oil formulation of claim 1, wherein the PAO having a viscosity of at least 135 cSt, Kv 100°

C., has a VI of from 180 to 306.

4. The lubricating oil formulation of claim 1, wherein the PAO having a viscosity of at least 135 cSt, Kv 100°

C. is a metallocene catalyzed PAO.

5. The lubricating oil formulation of claim 4, wherein the metallocene catalyzed PAO is made from a mixture of LAOs selected from C₃ to C₃₀.

6. The lubricating oil formulation of claim 4, wherein the metallocene catalyzed PAO is made from a LAO selected from C₃ to C₁₆.

7. The lubricating oil formulation of claim 1, wherein the formulation is prepared from a blend comprised of less than or equal to 41 wt % PAO having a viscosity of not greater than 4 cSt, Kv 100°

C., based on total weight of the blend components of the formulation.

8. The lubricating oil formulation of claim 7, wherein the formulation is prepared from a blend comprised of at least 45.7 wt % PAO having a viscosity of at least 135 cSt, Kv 100°

C., based on total weight of the blend components of the formulation.

9. The lubricating oil formulation of claim 1, wherein the formulation is prepared from a blend comprised of not greater than 13.3 wt. % of the at least one Group V basestock.

10. The lubricating oil formulation of claim 1, wherein the at least one Group V basestock is selected from the group consisting of alkylnaphthalenes, alkylbenzenes, polyalkylene glycols and esters.

11. A method of preparing a lubricating oil composition having reduced air entrainment, comprising blending together at least the following components:

at least 19.7 wt % PAO having a viscosity of at least 135 cSt, Kv 100°

C., based on total weight of the blend components of the formulation;

less than or equal to 70 wt % PAO having a viscosity of not greater than 40 cSt, Kv 100°

C., based on total weight of the blend components of the formulation; and

at least one Group V basestock, wherein the lubrication oil composition exhibits an air release time to 0.2% air of not greater than 7.1 minutes, according to ASTM D3427-03 at 75°

C.

12. The method of claim 11, wherein the PAO having a viscosity of at least 135 cSt, Kv 100°

C., has a MWD of not greater than 2.35.

13. The method of claim 11, wherein the PAO having a viscosity of at least 135 cSt, Kv 100°

C., has a VI of from 180 to 306.

14. The method of claim 11, wherein the PAO having a viscosity of at least 135 cSt, Kv 100°

C. is a metallocene catalyzed PAO.

15. The method of claim 14, wherein the metallocene catalyzed PAO is made from a mixture of LAOs selected from C₃ to C₃₀.

16. The method of claim 14, wherein the metallocene catalyzed PAO is made from a LAO selected from C₃ to C₁₆.

17. The method of claim 11, wherein the formulation is prepared from a blend comprised of less than or equal to 41 wt % PAO having a viscosity of not greater than 4 cSt, Kv 100°

C., based on total weight of the blend components of the formulation.

18. The method of claim 17, wherein the formulation is prepared from a blend comprised of at least 45.7 wt % PAO having a viscosity of at least 135 cSt, Kv 100°

C., based on total weight of the blend components of the formulation.

19. The method of claim 11, wherein the formulation is prepared from a blend comprised of not greater than 13.3 wt. % of the at least one Group V basestock.

20. The method of claim 11, wherein the at least one Group V basestock is selected from the group consisting of alkylnaphthalenes, alkylbenzenes, polyalkylene glycols and esters.