Lubricants having improved oxidation and deposit control performance
AssigneeExxon Mobil 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.
Claims13
A method comprising:
- blending a Group II base stock having
- a T10 distillation point of at least 482° C.,
- a viscosity index in a range of 95-119,
- a kinematic viscosity at 40° C. in a range of 320 cSt to 550 cSt,
- a kinematic viscosity at 100° C. in a range of 24 cSt to 41 cSt,
- 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,
- with at least one additional base stock comprising a Group I base stock and one or more additives to form a lubricating fluid,
- wherein the lubricating fluid has a saturates content of at least 70 wt. % and less than 90 wt % and 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 Group II base stock having:
- a T10 distillation point of at least 482° C.,
- a viscosity index in a range 95-119,
- a kinematic viscosity at 40° C. in a range of 320 cSt to 550 cSt,
- a kinematic viscosity at 100° C. in a range of 24 cSt to 41 cSt;
- and
- 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,
- with at least one additional base stock comprising a Group I base stock and one or more additives to form a lubricating fluid,
- wherein the lubricating fluid has a saturates content of at least 70 wt % and less than 90 wt % and 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 Group II base stock, a Group I base stock, and one or more additives, wherein:
- the Group II base stock has a T10 distillation point of at least 482° C.,
- a viscosity index in a range of 95-119,
- a kinematic viscosity at 40° C. of in a range of 320 cSt to 550 cSt,
- a kinematic viscosity at 100° C. in a range of 24 cSt to 41 cSt,
- 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
- wherein the lubricating fluid has a saturates content of at least 70 wt % and less than 90 wt. % and 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.
Dependencies are inferred from the claim text.