Lubricants having improved low temperature, oxidation, and deposit control performance
AssigneeExxonMobil Technology and Engineering Company
InventorsPercy R. Kanga, Camden N. Henderson, Lisa I. Yeh
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 maintain fluidity in a low temperature environment and 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.
Claims25
A method comprising:
- blending a base stock having 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 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 a group I base stock having a kinematic viscosity at 100° C. of 12 cSt or less 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. % an oxidation performance indicated by a kinematic viscosity at 100° C. (KV100) increase measured according to ASTM D5704 of 15% or less;
- and the lubricating fluid also has an Average Carbon/Varnish rating as measured under ASTM D5704 of from 8 to 10, or an Average Sludge rating as measured under ASTM D5704 of from 8 to 10.
A method for producing a deposit resistant fluid comprising:
- combining a base stock with at least one additional base stock and one or more additives to form a blended fluid configured to maintain fluidity in a low temperature environment and to resist forming deposits in an oxidizing environment;
- wherein 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;
- and wherein the base stock 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,
- wherein the at least one additional base stock comprises a group I base stock having a kinematic viscosity at 100° C. of 12 cSt or less, and
- wherein the deposit resistant fluid comprises a saturates content of at least 70 wt. % and less than 90 wt. % and wherein the blended fluid has an Average Carbon/Varnish rating as measured according to ASTM D5704 of from 8 to 10.
A deposit resistant fluid comprising:
- a base stock with at least one additional base stock and one or more additives, wherein:
- 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 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 deposit resistant fluid is configured to maintain fluidity in a low temperature environment and configured to resist forming deposits in an oxidizing environment,
- wherein the at least one additional base stock comprises a group I base stock having a kinematic viscosity at 100° C. of 12 cSt or less, and
- wherein the wherein the deposit resistant fluid comprises a saturates content of at least 70 wt. % and less than 90 wt. % and wherein the blended fluid has an Average Carbon/Varnish rating as measured according to ASTM D5704 of from 8 to 10.
Dependencies are inferred from the claim text.