Lubricant compositions having improved oxidation performance
OwnerDaniel J. EICHELSDOERFER, Richard C. DOUGHERTY +1inventors
InventorsDaniel J. EICHELSDOERFER, Richard C. DOUGHERTY, Charles L. BAKER, JR.
Life of this patent
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Abstract
Disclosed are lubricant compositions with improved oxidation stability which are prepared with Group III base stocks comprising greater than or equal to about 90 wt. % saturated hydrocarbons (saturates); a viscosity index from 120 to 145; a unique ratio of molecules with multi-ring naphthenes to single ring naphthenes (2R+N/1RN); a unique ratio of branched carbons to straight chain (BC/SC) carbons; and a unique ratio of branched carbons to terminal chain (BC/TC) carbons.
Claims17
A lubricating composition comprising:
- a Group III base stock comprising at least 90 wt. % saturated hydrocarbons, the Group III base stock having a kinematic viscosity at 100° C. (KV100) of 4.0 cSt to 12.0 cSt, a viscosity index of from 120 to 133, and a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than 0.43;
- and
- an effective amount of one or more lubricant additives;
- wherein the lubricating composition has an oxidation induction time greater than 120 minutes.
An engine oil composition comprising:
- a Group III base stock, the Group III base stock having at least 90 wt. % saturated hydrocarbons, kinematic viscosity at 100° C. of from 4.0 cSt up to 5.0 cSt, a viscosity index of from 120 to less than 140, and a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than 0.45;
- and
- an effective amount of one or more lubricant additives;
- wherein the oil composition has an oxidation induction time greater than 120 minutes.
A heavy duty diesel engine lubricating oil composition comprising:
- a Group III base stock, the Group III base stock having at least 90 wt. % saturated hydrocarbons, a kinematic viscosity at 100° C. of from 5.5 cSt up to 7.0 cSt, a viscosity index of from 120 to less than 144;
- and a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than 0.56;
- and
- an effective amount of one or more lubricant additives;
- wherein the lubricating oil composition has an oxidation induction time greater than 120 minutes.
A lubricating composition comprising:
- a Group III base stock having at least 90 wt. % saturated hydrocarbons, a kinematic viscosity at 100° C. of 4.0 cSt to 5.0 cSt, a viscosity index of 120 to 140, and a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than 0.52;
- and a ratio of branched carbons to straight chain carbons (BC/SC) less than or equal to 0.21;
- and
- an effective amount of one or more lubricant additives;
- wherein the lubricating composition has an oxidation induction time greater than 120 minutes.
A lubricating composition comprising:
- a Group III base stock having:
- at least 90 wt. % saturated hydrocarbons;
- kinematic viscosity at 100° C. of 5.0 cSt to 12.0 cSt;
- a viscosity index of 120 to 140;
- a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than 0.59;
- and a ratio of branched carbons to straight chain carbons (BC/SC) less than or equal to 0.26;
- and
- an effective amount of one or more lubricant additives;
- wherein the lubricating composition has an oxidation induction time greater than 120 minutes.
The lubricating composition of clause 12, wherein the base stock has a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than 0.59 and BC/TC≤2.3.
A lubricating composition comprising:
- a Group III base stock comprising:
- at least 90 wt. % saturated hydrocarbons;
- kinematic viscosity at 100° C. (KV100) of 4.0 cSt to 5.0 cSt;
- a viscosity index of from 120 to 140;
- and
- a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than 0.45;
- and
- an effective amount of one or more lubricant additives;
- wherein the lubricating composition has an oxidation induction time greater than 120 minutes.
A lubricating composition comprising a Group III base stock having:
- at least 90 wt. % saturated hydrocarbons;
- kinematic viscosity at 100° C. (KV100) of 5.0 cSt to 12.0 cSt;
- a viscosity index of from 120 to 144;
- a ratio of multi-ring naphthenes to single ring naphthenes (2R+N/1RN) of less than 0.56;
- and
- an effective amount of one or more lubricant additives;
- wherein the lubricating composition has an oxidation induction time greater than 120 minutes.
Dependencies are inferred from the claim text.