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US 2009/0156442 A1Published application
Lubricant Compositions With Low HTHS for a Given SAE Viscosity Grade
OwnerLaurent Chambard, Jai G. Bansalinventors
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Abstract
A lubricant composition that exhibits low high temperature high shear viscosity is disclosed. The lubricant composition is made up of a first polymer having a kinematic viscosity ratio less than or equal to 0.25 and a shear stability index (SSI) equal to or greater than 20 percent and base oil having a viscosity index equal to or greater than 120.
Claims13
A lubricant composition comprising:
- a first polymer having a kinematic viscosity ratio less than or equal to 0.25 and a shear stability index (SSI) equal to or greater than 20 percent;
- and
- base oil having a viscosity index equal to or greater than 120.
A lubricant composition comprising:
- a polymer having a kinematic viscosity ratio less than or equal to 0.25 and a shear stability index (SSI) equal to or greater than 20 percent;
- and
- a. base oil having a viscosity index equal to or greater than 120,
- wherein the concentration of phosphorus in the lubricant composition is less than 0.08 weight percent and the concentration of sulfur is less than 0.5 weight percent.
1 more element
Dependencies are inferred from the claim text.