Lubricants Having Improved Oxidation And Deposit Control Performance
AssigneeExxonMobil Technology and Engineering Company
InventorsLisa I. Yeh, Camden N. Henderson, Percy R. Kanga
Life of this patent
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Abstract
A method for producing a deposit resistant fluid includes combining a base stock and one or more additives to form a blended fluid configured to resist forming deposits in an oxidizing environment. The base stock has a viscosity index of at least 80, and either a kinematic viscosity at 40° C. of at least 320 cSt or a kinematic viscosity at 100° C. of at least 14 cSt. The base stock includes greater than or equal to about 90 wt % saturates, less than or equal to about 10 wt % aromatics, and a sum of terminal/pendant propyl groups and terminal/pendant ethyl groups of at least 1.7 per 100 carbon atoms.
Claims15
A method comprising:
- blending a base stock and one or more additives to form a lubricating fluid,
- wherein:
- the base stock has a T10 distillation point of at least 482° C., a viscosity index of at least 80, and either a kinematic viscosity at 40° C. of at least 320 cSt or a kinematic viscosity at 100° C. of at least 14 cSt;
- and comprises:
- greater than or equal to about 90 wt % saturates, less than or equal to about 10 wt % aromatics, and a sum of terminal/pendant propyl groups and terminal/pendant ethyl groups of at least 1.7 per 100 carbon atoms;
- and the lubricating fluid has an oxidation performance indicated by a kinematic viscosity at 100° C. (KV100) increase measured according to ASTM D5704 of 30% or less, or an oxidation performance indicated by a kinematic viscosity at 100° C. (KV100) increase measured according to ASTM D2893 of 6% or less.
A method comprising:
- blending a base stock and one or more additives to form a lubricating fluid,
- wherein:
- the base stock has a T10 distillation point of at least 482° C., a viscosity index of at least 80, and either a kinematic viscosity at 40° C. of at least 320 cSt or a kinematic viscosity at 100° C. of at least 14 cSt;
- and comprises:
- greater than or equal to about 90 wt % saturates, less than or equal to about 10 wt % aromatics, and a sum of terminal/pendant propyl groups and terminal/pendant ethyl groups of at least 1.7 per 100 carbon atoms;
- and the lubricating fluid has a Brookfield viscosity measured according to ASTM D2983 of:
- 70,000 mPa·s or less at −12° C., or 150,000 mPa·s or less at −26° C.;
- or the lubricating fluid has a MRV viscosity measured according to ASTM D4684 of 18,000 mPa·s or less at a test temperature from −20° C. to −8° C.
A lubricating fluid comprising:
- a base stock and one or more additives,
- wherein:
- the base stock has a T10 distillation point of at least 482° C., a viscosity index of at least 80, and either a kinematic viscosity at 40° C. of at least 320 cSt or a kinematic viscosity at 100° C. of at least 14 cSt;
- and comprises:
- greater than or equal to about 90 wt % saturates, less than or equal to about 10 wt % aromatics, and a sum of terminal/pendant propyl groups and terminal/pendant ethyl groups of at least 1.7 per 100 carbon atoms;
- and the lubricating fluid has an oxidation performance indicated by a kinematic viscosity at 100° C. (KV100) increase measured according to ASTM D5704 of 30% or less, or an oxidation performance indicated by a kinematic viscosity at 100° C. (KV100) increase measured according to ASTM D2893 of 6% or less.
-18. (canceled)
Dependencies are inferred from the claim text.