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US 11,352,579 B2Granted
Group III base stocks and lubricant compositions
AssigneeExxonMobil Technology and Engineering Company
InventorsDaniel J. Eichelsdoerfer, Richard C. Dougherty, Charles L. Baker, Jr., Rugved P. Pathare, Bryan E. Hagee
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Abstract
Disclosed are Group III base stocks comprising at least 30 wt % naphthenes, a viscosity index from 120 to 145; and a unique ratio of molecules with multi-ring naphthenes to single ring naphthenes (2R+N/1RN). A method for preparing the base stocks is also disclosed. Also disclosed is a lubricating oil having the base stock as a major component, and an additive as a minor component.
Claims28
A Group III base stock comprising:
- at least about 30 wt % of naphthenes;
- about 30 wt % to about 70 wt % paraffins;
- wherein the Group III base stock has a viscosity index of about 120 to about 133;
- wherein the Group III base stock has a kinematic viscosity at 40° C. (KV40) of about 18.07 cSt to about 19.89 cSt;
- and
- wherein the Group III base stock has a ratio of molecules with multi-ring naphthenes to single ring naphthenes, 2R+N/1RN, of less than about 0.46.
3 more elements
A Group III base stock comprising:
- at least about 30 wt % of naphthenes;
- about 30 wt % to about 70 wt % paraffins;
- wherein the Group III base stock has:
- a viscosity index of 120 to 145;
- a kinematic viscosity at 40° C. (KV40) of about 18.07 cSt to about 19.89 cSt;
- and,
- a ratio of molecules with multi-ring naphthenes to single ring naphthenes, 2R+N/1RN, of less than about 0.46.
4 more elements
A Group III base stock comprising:
- at least about 30 wt % of naphthenes;
- and
- about 30 wt % to about 70 wt % paraffins;
- wherein the Group III base stock has:
- a viscosity index of about 120 to about 145;
- a ratio of molecules with multi-ring naphthenes to single ring naphthenes, 2R+N/1RN, of less than about 0.46;
- a kinematic viscosity at 100° C. (KV100) of about 8 cSt to about 12 cSt;
- a kinematic viscosity at 40° C. (KV40) of about 53.35 cSt to about 59.7 cSt;
- and
- a cold crank simulator (CCS) value at −35° C. of about 10,000 cP to about 70,000 cP.
7 more elements
Dependencies are inferred from the claim text.