Back to results
US 7,067,049 B1Granted
Formulated lubricant oils containing high-performance base oils derived from highly paraffinic hydrocarbons
AssigneeExxonMobil Oil Corporation
InventorsDavid J. Baillargeon, Thomas R. Forbus, Jr., Kenneth R. Graziani, Gretchen R. Hall, Nancy M. Page, Richard F. Socha
Life of this patent
Estimating the term…
Abstract
The present invention relates to formulated lubricant oils derived from a highly paraffinic basestock. The lubricating oils of the present invention achieve the extremely stringent viscosity requirements of SAE “0W” crossgraded engine oils and demonstrate an excellent combination of low-temperature performance and biodegradability not achievable by other formulations derived from other classes of basestocks.
Claims42
A liquid lubricant composition, comprising
- (i) a paraffinic biodegradable hydrocarbon basestock component having a biodegradability of at least 50% (OECD 301B) and having a pour point of from about −25° C. to −55° C. and a viscosity index of 130 to 160, in which the extent of branching, as measured by the percentage at methyl hydrogens (BI), and the proximity of branching, as measured by the percentage of recurring methylene carbons which are four or more carbons removed from an end group or branch (CH2>4), are such that;
- BI−0.5(CH2>4)>15:
- and (a)
- BI+0.85(CH2>4)<45;
- (b)
- as measured Over said hydrocarbon basestock as a whole, and
- (ii) additives soluble in the basestock comprising a detergent and an antioxidant,
- the liquid lubricant composition having a CCS viscosity at −15° C. of not more than about 3500 cP and a kinematic viscosity at 100° C. of not less than about 5 cSt.
5 more elements
Dependencies are inferred from the claim text.