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US 6,806,237 B2Granted
Lube base oils with improved stability
AssigneeChevron U.S.A. Inc.
InventorDennis J. O'Rear
Life of this patent
Estimating the term…
Abstract
A lube base oil comprising a synthetic lube base oil, such as a Fischer Tropsch-derived component, and a non-synthetic lube base oil is defined that has improved stability to oxidation both during storage and during use in engines or other applications, even in the substantial absence of anti-oxidant additives and oxidation promoters.
Claims14
A lube base oil comprising:
- a) at least one synthetic lube base oil having an iso-paraffin content of greater than 50% and an Oxidator A value of less than about 1;
- and
- b) at least one percent of a non-synthetic lube base oil selected from the groups consisting of Group I lube base oils, Group II lube base oils with a sulfur content greater than about 50 ppm, petroleum-derived Group V lube base oils, or mixtures thereof wherein the non-synthetic lube base oil has an Oxidator BN value of less than about 7;
- wherein the lube base oil has an Oxidator A value of greater than about 1 and has an Oxidator BN value of greater than about 7.
1 more element
A lube base oil comprising:
- a) at least one synthetic lube base oil having a sulfur content less than about 50 ppm and an Oxidator A value of less than about 1;
- and
- b) at least one percent of a non-synthetic lube base oil having a sulfur content greater than about 300 ppm and selected from the groups consisting of Group I lube base oils, petroleum-derived Group V lube base oils, or mixtures thereof wherein the non-synthetic lube base oil has an Oxidator BN value of less than about 7;
- wherein the lube base oil has an Oxidator A value of greater than about 1 and has an Oxidator BN value of greater than about 7.
1 more element
A lube base oil comprising:
- a) at least one synthetic lube base oil having an Oxidator A value of less than about 1 and an Oxidator BN value of greater than about 7;
- and
- b) a non-synthetic lube base oil having an Oxidator A value of greater than about 5 and an Oxidator BN value of less than about 10;
- wherein the lube base oil has an Oxidator A value of greater than about 5 and has an Oxidator BN value of greater than about 10.
1 more element
Dependencies are inferred from the claim text.