US2019345407A1PendingUtilityA1

Method for improving engine fuel efficiency

49
Assignee: EXXONMOBIL RES & ENG COPriority: May 11, 2018Filed: Apr 19, 2019Published: Nov 14, 2019
Est. expiryMay 11, 2038(~11.8 yrs left)· nominal 20-yr term from priority
Inventors:Douglas E. DeckmanNicole WallaceMark P. Hagemeister
C10N 2030/54C10N 2040/255C10N 2030/02C10N 2030/04C10N 2040/252C10N 2020/073C10M 2205/06C10M 145/14C10M 2209/084C10M 143/12C10M 169/041C10M 2207/2835C10M 2205/04C10M 2205/022C10M 2205/0285C10M 2207/2805C10M 2203/1025C10M 2205/173C10N 2240/102C10N 2230/02C10N 2240/104
49
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

A method for improving fuel efficiency while maintaining or improving deposit control, in an engine lubricated with a lubricating oil. The lubricating engine oil has a composition including from 20 to 85 wt % of a first lubricating oil base stock selected from the group consisting of a Group I base stock, a Group II base stock, a Group III base stock, a Group IV base stock, and combinations thereof; from 5 to 55 wt % of a second lubricating oil base stock comprising at least one ester based Group V base stock; from 5 to 20 wt % of at least one viscosity modifier, and one or more other lubricating oil additives. The lubricating engine oils are useful in internal combustion engines including direct injection, gasoline and diesel engines.

Claims

exact text as granted — not AI-modified
1 . A method for improving fuel efficiency while maintaining or improving deposit control, in an engine lubricated with a lubricating oil by using as the lubricating engine oil a formulated oil, said formulated oil having a composition comprising:
 from 20 to 85 wt % of a first lubricating oil base stock selected from the group consisting of a Group I base stock, a Group II base stock, a Group III base stock, a Group IV base stock, and combinations thereof;   from 5 to 55 wt % of a second lubricating oil base stock comprising at least one ester based Group V base stock;   from 5 to 20 wt % of at least one viscosity modifier, and   wherein the remainder of the lubricating engine oil includes one or more other lubricating oil additives;   wherein fuel efficiency properties are improved (kinematic viscosity at 25 deg. C. of less than or equal to 125 cSt) and deposit control is maintained or improved (TEOST 33C total deposits less than or equal to 60 mg) as compared to fuel efficiency properties and deposit control achieved using a lubricating engine oil not containing the at least one ester based Group V base stock and the at least one viscosity modifier.   
     
     
         2 . The method of  claim 1 , wherein the at least one viscosity modifier comprises linear or star-shaped polymers and copolymers of methacrylate, butadiene, olefins, alkylated styrenes or combinations thereof. 
     
     
         3 . The method of  claim 1 , wherein the at least one viscosity modifier is selected from the group consisting of polyisobutylene, polymethacrylate, polyisoprene, copolymers of ethylene and propylene, hydrogenated block copolymers of styrene and isoprene, styrene-butadiene based polymers, star polyisoprene polymers, star polyisoprene-styrene copolymers and combinations thereof. 
     
     
         4 . The method of  claim 3 , wherein the at least one viscosity modifier is a styrene isoprene copolymer having a molecular weight of from 50,000 to 200,000. 
     
     
         5 . The method of  claim 1 , wherein the at least one ester based Group V base stock comprises an ester of trimethylol propane, trimethylol butane, trimethylol ethane, pentaerythritol or dipentaerythritol with one or more monocarboxylic acids containing from 5 to 20 carbon atoms. 
     
     
         6 . The method of  claim 1 , wherein the at least one ester based Group V base stock is selected from the group consisting of a C8/C10/C12/C14/C16/C18 Estolide ester, a C11/C13/C15/C17 Estolide ester, a C8/C10 trimethylolpropane (TMP) ester, a C6/C7/C8/C10 TMP ester, a C5/C6/C7/C8/C9/C10 TMP ester, a C8/C10/C12/C14/C16/C18/C20 TMP ester, a C7/C8/C10 TMP ester, a C7/C9/C11/C13/C15 TMP ester, a C6/C7/C9 TMP ester, a C6/C7/C9 TMP ester, a C4/C5/C6/C7/C8/C9 TMP ester, a C15/C17 propylene glycol diester, a C16/C18 propylene glycol diester and combinations thereof. 
     
     
         7 . The method of  claim 6 , where the at least one ester based Group V base stock comprises from 25 to 55 wt % of the lubricating engine oil. 
     
     
         8 . The method of  claim 1 , wherein the at least one ester based Group V base stock comprises a monoester, a di-ester, a polyol ester, a complex ester or mixtures thereof derived from a renewable biological material. 
     
     
         9 . The method of  claim 8 , wherein the renewable biological material is derived from coconut oil, palm oil, rapeseed oil, soy oil, vegetable oil, or sunflower oil. 
     
     
         10 . The method of  claim 1 , wherein the one or more other lubricating oil additives are selected from the group consisting of an anti-wear additive, antioxidant, detergents, dispersant, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, anti-rust additive, and friction modifier. 
     
     
         11 . The method of  claim 1 , wherein the lubricating engine oil has a kinematic viscosity at 25 deg. C. of less than or equal to 110 cSt. 
     
     
         12 . The method of  claim 1 , wherein the lubricating engine oil has TEOST 33C total deposits less than or equal to 50 mg. 
     
     
         13 . The method of  claim 1 , wherein the lubricating engine oil has a kinematic viscosity at 100 deg. C. ranging from 8 to 15 cSt. 
     
     
         14 . The method of  claim 1 , wherein the first lubricating oil base stock is a mixture of a Group III base stock and a Group IV base stock. 
     
     
         15 . The method of  claim 14 , wherein the Group III base stock is a gas to liquids (GTL) base stock and the Group IV base stock is a polyalphaolefin (PAO) base stock. 
     
     
         16 . The method of  claim 15 , wherein the GTL ranges from 20 to 75 wt % of the lubricating engine oil and the PAO ranges from 2 to 10 wt % of the lubricating engine oil. 
     
     
         17 . The method of  claim 1 , wherein the high temperature high shear (HTHS) viscosity at 150° C. of the lubricating engine oil ranges from 1.5 to 4.5 cP and wherein the lubricating engine oil is an SAE viscosity grade selected from the group consisting of 0W-30, 5W-30, 0W-20, 5W-20, 0W-16, 5W-16, 0W-12, 5W-12, 0W-8, and 5W-8. 
     
     
         18 . A lubricating engine oil having a composition comprising:
 from 20 to 85 wt % of a first lubricating oil base stock selected from the group consisting of a Group I base stock, a Group II base stock, a Group III base stock, a Group IV base stock, and combinations thereof;   from 5 to 55 wt % of a second lubricating oil base stock comprising at least one ester based Group V base stock;   from 5 to 20 wt % of at least one viscosity modifier, and   wherein the remainder of the lubricating engine oil includes one or more other lubricating oil additives;   wherein fuel efficiency properties are improved (kinematic viscosity at 25 deg. C. of less than or equal to 125 cSt) and deposit control is maintained or improved (TEOST 33C total deposits less than or equal to 60 mg) as compared to fuel efficiency properties and deposit control achieved using a lubricating engine oil not containing the at least one ester based Group V base stock and the at least one viscosity modifier.   
     
     
         19 . The lubricating engine oil of  claim 18 , wherein the at least one viscosity modifier comprises linear or star-shaped polymers and copolymers of methacrylate, butadiene, olefins, alkylated styrenes or combinations thereof. 
     
     
         20 . The lubricating engine oil of  claim 18 , wherein the at least one viscosity modifier is selected from the group consisting of polyisobutylene, polymethacrylate, polyisoprene, copolymers of ethylene and propylene, hydrogenated block copolymers of styrene and isoprene, styrene-butadiene based polymers, star polyisoprene polymers, star polyisoprene-styrene copolymers and combinations thereof. 
     
     
         21 . The lubricating engine oil of  claim 20 , wherein the at least one viscosity modifier is a styrene isoprene copolymer having a molecular weight of from 50,000 to 200,000. 
     
     
         22 . The lubricating engine oil of  claim 18 , wherein the at least one ester based Group V base stock comprises an ester of trimethylol propane, trimethylol butane, trimethylol ethane, pentaerythritol or dipentaerythritol with one or more monocarboxylic acids containing from 5 to 20 carbon atoms. 
     
     
         23 . The lubricating engine oil of  claim 18 , wherein the at least one ester based Group V base stock is selected from the group consisting of a C8/C10/C12/C14/C16/C18 Estolide ester, a C11/C13/C15/C17 Estolide ester, a C8/C10 trimethylolpropane (TMP) ester, a C6/C7/C8/C10 TMP ester, a C5/C6/C7/C8/C9/C10 TMP ester, a C8/C10/C12/C14/C16/C18/C20 TMP ester, a C7/C8/C10 TMP ester, a C7/C9/C11/C13/C15 TMP ester, a C6/C7/C9 TMP ester, a C6/C7/C9 TMP ester, a C4/C5/C6/C7/C8/C9 TMP ester, a C15/C17 propylene glycol diester, a C16/C18 propylene glycol diester and combinations thereof. 
     
     
         24 . The lubricating engine oil of  claim 23 , where the at least one ester based Group V base stock comprises from 25 to 55 wt % of the lubricating engine oil. 
     
     
         25 . The lubricating engine oil of  claim 18 , wherein the at least one ester based Group V base stock comprises a monoester, a di-ester, a polyol ester, a complex ester or mixtures thereof derived from a renewable biological material. 
     
     
         26 . The lubricating engine oil of  claim 25 , wherein the renewable biological material is derived from coconut oil, palm oil, rapeseed oil, soy oil, vegetable oil, or sunflower oil. 
     
     
         27 . The lubricating engine oil of  claim 18 , wherein the one or more other lubricating oil additives are selected from the group consisting of an anti-wear additive, antioxidant, detergents, dispersant, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, anti-rust additive, and friction modifier. 
     
     
         28 . The lubricating engine oil of  claim 18 , wherein the lubricating engine oil has a kinematic viscosity at 25 deg. C. of less than or equal to 110 cSt. 
     
     
         29 . The lubricating engine oil of  claim 18 , wherein the lubricating engine oil has TEOST 33C total deposits less than or equal to 50 mg. 
     
     
         30 . The lubricating engine oil of  claim 18 , wherein the lubricating engine oil has a kinematic viscosity at 100 deg. C. ranging from 8 to 15 cSt. 
     
     
         31 . The lubricating engine oil of  claim 18 , wherein the first lubricating oil base stock is a mixture of a Group III base stock and a Group IV base stock. 
     
     
         32 . The lubricating engine oil of  claim 31 , wherein the Group III base stock is a gas to liquids (GTL) base stock and the Group IV base stock is a polyalphaolefin (PAO) base stock. 
     
     
         33 . The lubricating engine oil of  claim 32 , wherein the GTL ranges from 20 to 75 wt % of the lubricating engine oil and the PAO ranges from 2 to 10 wt % of the lubricating engine oil. 
     
     
         34 . The lubricating engine oil of  claim 18 , wherein the high temperature high shear (HTHS) viscosity at 150° C. of the lubricating engine oil ranges from 1.5 to 4.5 cP. 
     
     
         35 . The lubricating engine oil of  claim 34 , wherein the lubricating engine oil is an SAE viscosity grade selected from the group consisting of 0W-30, 5W-30, 0W-20, 5W-20, 0W-16, 5W-16, 0W-12, 5W-12, 0W-8, and 5W-8. 
     
     
         36 . The lubricating engine oil of  claim 18 , wherein the lubricating engine oil is a passenger vehicle engine oil (PVEO).

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.