SG193975A1 - Low viscosity engine oil with superior engine wear protection - Google Patents
Low viscosity engine oil with superior engine wear protection Download PDFInfo
- Publication number
- SG193975A1 SG193975A1 SG2013072582A SG2013072582A SG193975A1 SG 193975 A1 SG193975 A1 SG 193975A1 SG 2013072582 A SG2013072582 A SG 2013072582A SG 2013072582 A SG2013072582 A SG 2013072582A SG 193975 A1 SG193975 A1 SG 193975A1
- Authority
- SG
- Singapore
- Prior art keywords
- lubricant composition
- viscosity index
- engine
- polymeric viscosity
- oil
- Prior art date
Links
- 239000010705 motor oil Substances 0.000 title claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 81
- -1 dithio phosphate Chemical compound 0.000 claims abstract description 49
- 239000000314 lubricant Substances 0.000 claims abstract description 44
- 239000003599 detergent Substances 0.000 claims abstract description 42
- 239000002199 base oil Substances 0.000 claims abstract description 27
- 239000000446 fuel Substances 0.000 claims abstract description 14
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 11
- 239000010452 phosphate Substances 0.000 claims abstract description 8
- 239000011701 zinc Substances 0.000 claims abstract description 8
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 7
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 150000001342 alkaline earth metals Chemical class 0.000 claims abstract description 5
- 239000002270 dispersing agent Substances 0.000 claims description 30
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 18
- 229920000642 polymer Polymers 0.000 claims description 11
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 claims description 9
- 150000003871 sulfonates Chemical class 0.000 claims description 9
- 239000011575 calcium Substances 0.000 claims description 8
- 229920001577 copolymer Polymers 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 229960002317 succinimide Drugs 0.000 claims description 4
- 239000004034 viscosity adjusting agent Substances 0.000 claims description 4
- 229920001195 polyisoprene Polymers 0.000 claims description 3
- 150000003873 salicylate salts Chemical class 0.000 claims 5
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 claims 1
- 241000120283 Allotinus major Species 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 40
- 235000019198 oils Nutrition 0.000 description 40
- 239000000654 additive Substances 0.000 description 18
- 239000000463 material Substances 0.000 description 18
- 125000003118 aryl group Chemical group 0.000 description 17
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- 125000001183 hydrocarbyl group Chemical group 0.000 description 16
- 239000003607 modifier Substances 0.000 description 16
- 125000000217 alkyl group Chemical group 0.000 description 15
- 239000003963 antioxidant agent Substances 0.000 description 14
- 239000003795 chemical substances by application Substances 0.000 description 12
- 229920013639 polyalphaolefin Polymers 0.000 description 12
- 229910052717 sulfur Inorganic materials 0.000 description 12
- 239000011593 sulfur Substances 0.000 description 11
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 10
- 150000001412 amines Chemical class 0.000 description 10
- 125000004432 carbon atom Chemical group C* 0.000 description 10
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- 125000001931 aliphatic group Chemical group 0.000 description 7
- 235000021317 phosphate Nutrition 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
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- 238000009472 formulation Methods 0.000 description 5
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- 230000001050 lubricating effect Effects 0.000 description 5
- 239000002480 mineral oil Substances 0.000 description 5
- UFWIBTONFRDIAS-UHFFFAOYSA-N naphthalene-acid Natural products C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 5
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- 239000000126 substance Substances 0.000 description 5
- YAXXOCZAXKLLCV-UHFFFAOYSA-N 3-dodecyloxolane-2,5-dione Chemical class CCCCCCCCCCCCC1CC(=O)OC1=O YAXXOCZAXKLLCV-UHFFFAOYSA-N 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 4
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- 230000000996 additive effect Effects 0.000 description 4
- 125000000129 anionic group Chemical group 0.000 description 4
- 239000002518 antifoaming agent Substances 0.000 description 4
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
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- 239000000194 fatty acid Substances 0.000 description 4
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- 150000004665 fatty acids Chemical class 0.000 description 4
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- 239000000047 product Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
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- 239000001993 wax Substances 0.000 description 4
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 3
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 241000252067 Megalops atlanticus Species 0.000 description 3
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- 150000007513 acids Chemical class 0.000 description 3
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- 125000003342 alkenyl group Chemical group 0.000 description 3
- 150000001408 amides Chemical class 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 150000007942 carboxylates Chemical class 0.000 description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 3
- 150000001735 carboxylic acids Chemical class 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000007859 condensation product Substances 0.000 description 3
- 238000006482 condensation reaction Methods 0.000 description 3
- 230000000994 depressogenic effect Effects 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- 229940069096 dodecene Drugs 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
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- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 3
- PDEDQSAFHNADLV-UHFFFAOYSA-M potassium;disodium;dinitrate;nitrite Chemical compound [Na+].[Na+].[K+].[O-]N=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PDEDQSAFHNADLV-UHFFFAOYSA-M 0.000 description 3
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- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
- C10M171/02—Specified values of viscosity or viscosity index
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/102—Aliphatic fractions
- C10M2203/1025—Aliphatic fractions used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/022—Ethene
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
- C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/04—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/06—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing conjugated dienes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/26—Overbased carboxylic acid salts
- C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/2805—Esters used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/28—Amides; Imides
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/046—Overbasedsulfonic acid salts
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/045—Metal containing thio derivatives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/40—Low content or no content compositions
- C10N2030/45—Ash-less or low ash content
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/54—Fuel economy
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- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
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- C10N2040/00—Specified use or application for which the lubricating composition is intended
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- C10N2040/253—Small diesel engines
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- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/25—Internal-combustion engines
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Abstract
An engine oil lubricant composition comprising a. major amount of base oil and an effective amount of a zinc dialkyl dithio phosphate, a polymeric viscosity index improver and a. mixture of alkaline earth metal detergents provides improved fuel efficiency while providing excellent wear in an engine.
Description
LOW VISCOSITY ENGINE OIF, WITH SUPERIOR
ENGINE WEAR PROTECTION
[0681] This mvention relates to a lubricant oil composition having a sulfated ash content of about (0.6 wt% and a high-temperature high-shear (HTHS) viscosity of lower than 2.9 cP at 150°C that provides excellent engine wear protection and improved fuel efficiency and use thereof.
10082] Fuel efficiency requirements for passenger vehicles are becoming increasingly more stringent. New legislation in the United States and European
Union within the past few years has set fuel economy and emissions targets not readily achievable with today’s vehicle and lubricant technology. In order to improve lubricant fuel economy performance, reduction of viscosity is typically the best path; however, present day lubricant oils with a high temperature high- shear (HTHS) viscosity of less than 2.9 cP at 150°C would not be expected to be able to provide acceptable passenger vehicle diesel engine durability performance. 16683] HTHS is the measure of a lubricant’s viscosity under severe engine conditions. Under high temperatures and high stress conditions viscosity index improver degradation can occur. As this happens, the viscosity of the oil decreases which may lead to increased engine wear, HTHS is measured using
ASTM 4683, which is incorporated herein by reference.
[6604] In view of the more strict requirements, manufacturers are moving towards the use of diesel engines. Diesel engines are more prone to filter on plugging due to high sulfated ash content of the lubricant, For this reason, diesel engine vehicle manufacturers generally recornmend lubricants with reduced sulfated ash levels. 18665] Despite the advances in lubricant oil formulation technology, there remains a need for an engine oil lubricant that effectively improves fuel economy while providing superior antiwear performance.
180866] In accordance with a first aspect of the invention, there is provided an engine oil lubricant composition comprising a major amount of base oil and an effective amount of a zinc dialkyl dithio phosphate, a polymeric viscosity index improver and a mixture of alkaline carth metal detergents. The engine oil fubricant composition has a sulfated ash content of less than about 0.8 wit% and an
HTHS of less than about 2.9 ¢P at 150°C. 18667] In another aspect of the invention, there is provided a method for improving fuel efficiency and wear in an engine. The method comprising adding to an engine, an engine oil lubricant composition having a sulfated ash content of about 0.8 wt% and an HTHS of about 2.9 ¢P at 150°C. The lubricant composition comprises a zinc dialkyl dithio phosphate, a polymeric viscosity modifier and a mixture of alkaline carth metal detergents.
[6088] Other objects and advantages of the present invention will become apparent from the detailed description that follows.
En
[668%] It bas now been found that an engine oil lubricant composition comprising a major amount of base oil and an effective amount of a zinc dialkyl dithio phosphate, a polymeric viscosity index improver and a mixture of alkaline carth metal detergents provides improved fuel efficiency while providing excellent wear in an engine. The engine oil lubricant composition has a sulfated ash content of less than about 0.8 wit% and an HTHS of less than about 2.9 cP at 150°C. 10016] A wide range of lubricating base oils 1s known in the art, Lubricating base oils that are useful in the present invention are both natural oils, and synthetic oils, and unconventional oils (ov mixtures thereof) can be used urrefined, refined, or rerefined (the latter is also known as reclaimed or reprocessed oil). Unrefined oils are those obtained directly from a wvatural or synthetic source and used without added purification. These include shale oil obtained directly from retorting operations, petroleum oil obtained directly from privaary distillation, and ester oil obtained directly from an esterification process.
Refined oils are similar to the otls discussed for unrefined otls except refined oils are subjected to one or more purification steps to improve at least one lubricating oil property. One skilled in the art is familiar with many purification processes.
These processes include solvent extraction, secondary distillation, acid extraction, base extraction, filtration, and percolation. Rerefined oils are obtained by processes analogous to refined oils but using an oil that has been previously used. 18611} Groups I, IL, HI, IV and V arc broad categories of base oil stocks developed and defined by the American Petroleum Institute (API Publication 150%; www.APLorg) to create guidelines for lubricant base oils. Group { base stocks generally have a viscosity index of between about 80 to 120 and contain greater than about 0.03% sulfur and/or less than about 90% saturates. Group 11 base stocks generally have a viscosity index of between about 80 to 120, and contain less than or equal to about 6.03% sulfur and greater than or equal to about 90% saturates. Group IH stocks generally have a viscosity index greater than about 120 and contain less than or equal to about 0.03% sulfur and greater than about 90% saturates. Group IV includes polyalphaolefins (PAO). Group V base stock includes base stocks not included in Groups IV. The table below suramarizes properties of each of these five groups.
Base Oil Properties
Naturates Sulfur Viscosity Index
Group! <90 &/or > 0.03% & > RO & < 120
Group ll 290 & <0.03% & > 80 & << 120
Group ill >90 & <0.03% & > 120
Group IV Includes polyalphaolefins (PAG)
Group V All other base oil stocks not included in Groups |, I, HE or IV
[6612] Natural oils include animal oils, vegetable oils (castor oil and lard oil, for example), and mineral oils. Animal and vegetable oils possessing favorable thermal oxidative stability can be used. Of the natural oils, mineral oils are preferred. Mineral oils vary widely as to their crude source, for example, as to whether they are paraffinic, naphthenic, or mixed paraffinic-naphthenic. Oils derived from coal or shale are also useful. Natural oils vary alse as to the method used for their production and purification, for example, their distillation range and whether they are straight run or cracked, hydrorefined, or solvent extracted. 10013] Group UH and/or Group I hydroprocessed or hydrocracked basestocks, including synthetic oils such as polyalphaolefins, allyl aromatics and synthetic esters are also well known basestock oils.
LF. 10614] Synthetic oils include hydrocarbon oil. Hydrocarbon oils include oils such as polymerized and interpolymerized olefins (polvbutylenes, polypropylienes, propylene isobutylene copolymers, ethylene-olefin copolymers, and ethylene- alphaolefin copolymers, for example). Polyalphaolefin (PAO) oil base stocks are commonly used synthetic hydrocarbon oil. By way of example, PAOs derived from Cg, Cig, Cy, Cry olefins or mixtures thereof may be utilized. See U.S.
Patents 4,956,122; 4,827,064; and 4,827,073.
[6615] The number average molecular weights of the PAQs, which are known materials and generally available on a major commercial scale from suppliers such as ExxonMobil Chemical Company, Chevron Phillips Chemical Company,
BP, and others, typically vary from about 250 to about 3,000, although PAO’s may be made in viscosities up to about 100 ¢St (100°C). The PAOs are typically comprised of relatively low molecular weight hydrogenated polymers or oligomers of alphaolefins which include, but are not limited to, C; to about C5 alphaolefins with the Cy to about Cy; alphaolefins, such as 1-octene, 1-decene,
I-dodecene and the like, being preferred. The preferred polvalphaolefins are poly-T-octene, poly-l-decene and poly-i-dodecene and mixtures thereof and wixed olefin-derived polyolefins. However, the dimers of higher olefins in the range of Cy, to Cg may be used to provide low viscosity basestocks of acceptably tow volatility, Depending on the viscosity grade and the starting oligomer, the
PAQGs may be predominantly trimers and tetramers of the starting olefins, with minor amounts of the higher oligomers, having a viscosity range of 1.5 to 12 cSt.
[8016] The PAO fluids may be conveniently made by the polymerization of an alphaoclefin in the presence of a polymerization catalyst such as the Friedel-Crafts catalysts including, for example, aluminum trichloride, boron trifluoride or complexes of boron trifluoride with water, alcohols such as ethanol, propanol or butanol, carboxylic acids or esters such as ethyl acetate or ethyl propionate. For example the methods disclosed by U.S, Patent 4,149,178 or U.S. Patent 3,382,291 i. may be conveniently used herein. Other descriptions of PAO synthesis are found in the following US. Patents 3,742,082; 3,769,363; 3,876,720; 4,239,930; 4,367,352; 4,413,156; 4,434,408; 4,910,355; 4,956,122; and 5,068,487. The dimers of the Cy to Cig olefins are described in ULS. Patent 4,218,330.
[6617] The hydrocarbyl aromatics can be used as base oil or base oil component and can be any hydrocarbyl molecule that contains at least about 5% of its weight derived from an aromatic moiety such as a benzenoid moiety or naphthenoid moiety, or their derivatives. These hydrocarbyl aromatics include alkyl benzenes, alkyl naphthalenes, alkyl diphenyl oxides, alkyl naphthols, alkyl diphenyl sulfides, alkylated bis-phenol A, alkylated thiodiphenol, and the like.
The aromatic can be mono-alkylated, dialkylated, polyalkylated, and the like. The aromatic can be mono- or poly-functionalized. The hydrocarbyl groups can also be comprised of mixtures of alkyl groups, alkenyl groups, alkynyl, cycloalkyl groups, cycloalkenyl groups and other related hydrocarbyl groups. The hydrocarbyl groups can range from about Cy up to about Cg with a range of about Cy to about Cy often being preferred. A mixture of hydrocarbyl groups is often preferred, and up to about three such substituents may be present. The hydrocarbyl group can optionally contain sulfur, oxygen, and/or nitrogen containing substituents. The aromatic group can alse be derived from natural {petroleum) sources, provided at least about 5% of the molecule is comprised of an above-type aromatic moiety. Viscosities at 100°C of approximately 3 ¢St to about 50 cSt are preferred, with viscosities of approximately 3.4 cSt to about 20 cSt often being more preferred for the hydrocarbyl aromatic component. In one embodiment, an alkyl naphthalene where the alkyl group is primarily comprised of 1-hexadecene is used. Other alkylates of aromatics can be advantageously used. Naphthalene or methyl naphthalene, for example, can be alkylated with olefins such as octene, decene, dodecene, tetradecene or higher, mixtures of similar olefins, and the hike. Useful concentrations of hydrocarbyl aromatic in a tubricant oil composition can be about 2% to about 23%, preferably about 4% io
ST about 20%, and more preferably about 4% to about 15%, depending on the application. 10618] Esters comprise a useful base stock. Additive solvency and seal compatibility characteristics may be secured by the use of esters such as the esters of dibasic acids with monoalkanols and the polyol esters of monocarboxylic acids.
Esters of the former type include, for example, the esters of dicarboxylic acids such as phthalic acid, succinic acid, alkyl succinic acid, alkenyl succinic acid, maleic acid, azelaic acid, suberic acid, sebacic acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acid, alkyl malonic acid, alkenyl malonic acid, etc., with a variety of alcohols such as butyl alcohol, hexyl alcohol, dodecyl! alcohol, 2-ethylhexyl alcohol, ete. Specific examples of these types of esters include dibutyl adipate, di(2-cthythexyl) sebacate, di-n-hexyl fumarate, dicctyl scbacate, diisooctyl azelate, diisodecyl azclate, dioctyl phthalate, didecyl phthalate, dicicosyl scbacate, etc. 10619] Particularly useful synthetic esters are those which are obtained by reacting one or more polyhydric alcohols, preferably the hindered polyols (such as the neoopentyl polyols, e.g, neopentyl glveol, trimethylol ethane, 2-methyl- 2-propyi-1,3-propanediol, trimncthylol propane, pentaerythritol and dipenta- erythritol) with alkanoic acids containing at least about 4 carbon atoms, preferably
Cs to Cy acids such as saturated straight chain fatty acids including caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachic acid, and behenic acid, or the corresponding branched chain fatty acids or unsaturated fatty acids such as oleic acid, or mixtures of any of these materials. iB026] Suitable synthetic gster components include the esters of trimethylol propane, trimethylol butane, trimethylol ethane, pentaerythritol and/or dipenta- erythritol with one or more monocarboxylic acids containing from about 5 to about 10 carbon atoms. These esters are widely available commercially, for example, the Mobil P-41 and P-51 esters of ExxonMobil Chemical Company). 16621] Other useful fluids of lubricating viscosity include non-conventional or unconventional base stocks that have been processed, preferably catalytically, or synthesized to provide high performance lubrication characteristics.
[6622] Non-conventional or unconventional base stocks/base oils include one or more of a mixture of base stock(s) derived from one or more Gas-to-Liquids {GTL} materials, as well as isomerate/isodewaxate base stock(s) derived from natural wax or waxy feeds, mineral and or non-mineral oil waxy feed stocks such as slack waxes, natural waxes, and waxy stocks such as gas oils, waxy fuels hydrocracker bottoms, waxy ratfinate, hydrocrackate, thermal crackates, or other mineral, mineral oil, or even non-petrolcum oil derived waxy materials such as waxy materials received from coal liquefaction or shale oil, and mixtures of such base stocks.
[8023] The base oil constitutes the major component of the engine oil lubricant composition of the present invention and typically is present in an amount ranging from about 50 to about 99 wits, ¢.g., from about 85 to about 95 wt%, based on the total weight of the composition. The base oil may be selected from any of the synthetic or natural oils typically used as crankcase lubricating oils for spark- ignited and compression-ignited engines. The base oil conveniently has a kinematic viscosity, according to ASTM standards, of about 2.5 ¢St to about 12 cSt (or mm/s) at 100°C and preferably of about 2.5 cSt to about 9 cSt {or mm’/s) at 100° C. Mixtures of synthetic and natural base oils may be used if desired.
[0024] The engine oil lubricant composition of the present invention has an sulfated ash content of less than about 0.8 wit% and an HTHS of less than about 2.9 ¢P at 150°C, preferably about 2.7¢P at 150°C.
LG. 10625] While there are many different types of antiwear additives, for several decades the principal antiwear additive for internal combustion engine crankcase oils is a metal alkylthiophosphate and more particularly a metal dialkyldithio- phosphate in which the metal constituent is zine, or zine dialkyldithiophosphate (ZDDP). ZDDP can be primary, secondary or mixtures thereof. JZDDP compounds generally are of the formula Zn] SPESHOR NORD] » where R' and R are C-Cqg alkyl groups, preferably C,-Cyp alkyl groups. These alkyl groups may be straight chain or branched. The ZDDP is typically used in amounts of from about 0.4 to 1.4 wit of the total lubricant oil coruposition, although more or less can often be used advantageously. Preferably, the ZDDP is a secondary ZDDP and present in an amount of from about 8.6 to 1.0 wi% of the total lubricant composition.
[0026] Preferable zinc dithiophosphates which are commercially available include secondary zinc dithiophosphates such as those available from for example, The Lubrizol Corporation under the trade designations “LZ 677A”, “LZ 1095” and “LZ 13717, from for example Chevron Oronite under the trade designation “OLOA 262” and from for example Afton Chemical under the trade designation “HITEC 7169”. 100271 During engine operation, ot-insoluble oxidation byproducts are produced. Dispersants help keep these byproducts in solution, thus diminishing their deposition on metal surfaces. Dispersants may be ashless or ash-forming in nature. Preferably, the dispersant is ashless. So-called ashless dispersants are organic materials that form substantially no ash upon cowbustion. For example, non~-metal-containing or borated metal-free dispersanis are considered ashless. In contrast, metal-containing detergents discussed above form ash upon combustion.
[0028] Suitable dispersants typically contain a polar group attached to a relatively high molecular weight hydrocarbon chain, The polar group typically contains at least one clement of nitrogen, oxygen, or phosphorus. Typical hydrocarbon chains contain 50 to 400 carbon atoms. 10629] Chemically, many dispersanis may be characterized as phenates, sulfonates, sulfurized phenates, salicylates, vaphthenates, stearates, carbamates, thiocarbamates, phosphorus derivatives. A particularly useful class of dispersants are the alkenylsuceinic derivatives, typically produced by the reaction of a long chain substituted alkenyl succinic compound, usually a substituted succinic anhydride, with a polyhydroxy or polyamine compound. The long chain group constituting the oleophilic portion of the molecule which confers solubility in the oil, is normally a polyisobutylene group. Many examples of this type of dispersant are well known commercially and in the literature. Exemplary U.S.
Patents describing such dispersants are 3,172,892; 3,215,707; 3,219,666; 3,316,177; 3,341,542; 3,444,170; 3,454,607; 3,541,012; 3,630,904; 3,632,511; 3,787,374 and 4,234,435, Other types of dispersant are described in US. Patents 3,036,003; 3,200,107; 3,254,025; 3,275,554; 3,438,757; 3,454,555; 3,565,804; 3,413,347; 3,697,574; 3,725,277; 3,725,480; 3,726,882; 4,454,059; 3,329,655; 3,449,250; 3,519,565; 3,666,730; 3,687,849; 3,702,300; 4,100,082; 5,705,458. A further description of dispersants may be found, for example, in European Patent
Application No. 471 071, to which reference is made for this purpose. 10036] Hydrocarbyl-substituted succinic acid compounds are popular dispersants. In particular, succinimide, succinate esters, or succinate ester amides prepared by the reaction of a hydrocarbon-substituted succinic acid compound preferably having at least 50 carbon atorus in the hydrocarbon substituent, with at feast one equivalent of an alkylene amine are particularly useful.
[8031] Succinimides are formed by the condensation reaction between alkenyl succinic anhydrides and amines. Molar ratios can vary depending on the polyamine. For example, the molar ratio of alkenyl succinic anhydride to TEPA
~11- can vary from about 1:1 to about 5:1. Representative examples are shown in U.S.
Patents 3,087,936; 3,172,892; 3,219,666; 3,272,746; 3,322,670; and 3,652,616, 3,948,800; and Canada Pat. No. 1,094,044. 18632] Succinate esters are formed by the condensation reaction between alkenyl succinic anhydrides and alcohols or polyols. Molar ratios can vary depending on the alcohol or polyol used. For example, the condensation product of an alkenyl succinic anhydride and pentaerythritol is a useful dispersant. 18633] Succinate ester amides are formed by condensation reaction between alkenyl succinic anhydrides and alkanol amines. For cxample, suitable alkanol amines include cthoxylated pelyalkylpolyamines, propoxylated polyvalkylpoly- amines and polyalkenyipolyamines such as polyethylene polyamines. One example is propoxylated hexamethylenediamine. Representative cxamples are shown in U.S. Patent 4,426,305. 8034] The molecular weight of the alkenyl succinic anhydrides used in the preceding paragraphs will typically range between 800 and 2,500. The above products can be post-reacted with various reagents such as sulfur, oxygen, formaldehyde, carboxylic acids such as oleic acid, and boron compounds such as borate gsters or highly borated dispersants. The dispersants can be borated with from about (0.1 to about 5 moles of boron per mole of dispersant reaction product.
[6835] Mannich base dispersants are made from the reaction of alkylphenols, formaldehyde, and amines. See US. Patent 4,767,551, which is incorporated herein by reference. Process aids and catalysts, such as oleic acid and sulfonic acids, can alse be part of the reaction mixture. Molecular weights of the alkylphenols range from 800 to 2,500. Representative examples are shown in
U.S. Patents 3,697,374; 3,703,536; 3,704,308; 3,751,363; 3,756,953; 3,798,165; and 3,803,039.
18636] Typical high molecular weight aliphatic acid modified Mannich condensation products useful in this invention can be prepared from high molecular weight alkyl-substituted hydroxyaromatics or HN(R), group-containing reactanis, 16637] Hydrocarbyl substituted amine ashless dispersant additives are well known to one skilled in the art; see, for example, U.S. Patents 3,275,554; 3,438,757; 3,565,804; 3,755,433, 3,822,209, and 5,084,197.
[0038] Preferred dispersants include borated and non-borated succinimides, including those derivatives fromm mono-succinimides, bis-succinurnides, and/or mixtures of mono- and bis-succinimides, wherein the hydrocarbyl succinimide is derived from a hydrocarbylene group such as polyisebutylene having a Mn of from about 500 to about 5000 or a mixture of such hydrocarbylene groups. Other preferred dispersants include succinic acid-csters and amides, alkylphenol- polyamine~-coupled Mannich adducts, their capped derivatives, and other related components. Such additives may be used in an amount of about 0.1 to 20 wit%, preferably about 0.5 to § wit%. iB039] Viscosity index improvers (also known as VI improvers, viscosity modifiers, and viscosity improvers) provide lubricants with high and low temperature operability. These additives impart shear stability at elevated temperatures and acceptable viscosity at low temperatures. 10048] Saoitable viscosity index improvers include high molecular weight hydrocarbons, polyesters and viscosity index improver dispersants that function as both a viscosity index improver and a dispersant. Typical molecular weights of these polymers are between about 10,000 to 1,000,000, more typically about 20,000 to 500,000, and even more typically between about 50,000 and 200,000.
10041] Examples of suitable viscosity index improvers are lincar or star-shaped polymers and copolymers of methacrylate, butadiene, olefins, or alkylated styrenes. Polyisobutylene is a commonly used viscosity index improver. Another suitable viscosity index mmprover is pelymethacrylate {copolymers of various chain length alkyl methacrylates, for example), some formulations of which also serve as pour point depressants. Other suitable viscosity index improvers include copolymers of ethylene and propylene, hydrogenated block copolymers of styrene and isoprene, and polyacrylates (copolymers of various chain length acrylates, for example). Specific examples include styrene-isoprene or styrene-butadiene based polymers of 50,000 to 200,000 molecular weight.
[6642] Olefin copolymers, are commercially available from Chevron Oronite
Company LLC under the trade designation “PARATONE®” (such as “PARATONE® 8921” and “PARATONE® 9417); from Afton Chemical
Corporation under the trade designation “HiTEC®” {such as “HiTEC® 5850B™; and from The Lubrizel Corporation under the trade designation “Lubrizol® 7067C”. Polyisoprene polymers are commercially available from Infineum
International Limited, e.g. under the trade designation “SV200”; diene-styrenc copolymers are commercially available from Infineum International Limited, e.g. under the trade designation “SV 2607 18043] Viscosity index improvers may be used in an amount of about 0.01 to 4 wit, preferably about 0.01 to 2 wit%, on a solid polymer basis. 18044] Detergents are commonly used in lubricating compositions. A typical detergent is an anionic material that contains a long chain hydrophobic portion of the molecule and a smaller anionic or olecophobic hydrophilic portion of the molecule. The anionic portion of the detergent is typically derived from an organic acid such as a sulfur acid, carboxylic acid, phosphorous acid, phenol, or nuixtures thereof. The counterion is typically an alkaline earth or alkali metal.
[8045] Salts that contain a substantially stochiomeiric amount of the metal are described as neutral salts and have a total base number (TBN, as measured by
ASTM D2896) of from 0 to 80. Many compositions are overbased, containing large amounts of a metal base that 1s achieved by reacting an excess of a metal compound (a metal hydroxide or oxide, for example) with au acidic gas (such as carbon dioxide). Useful detergents can be neutral, mildly overbased, or highly overbased.
[6646] It is desirable for at least some detergent to be overbased. Overbased detergents help neutralize acidic impurities produced by the combustion process and become entrapped in the oil. Typically, the overbased material has a ratio of metallic ion to anionic portion of the detergent of about 1.05:1 to 58:1 on an equivalent basis. More preferably, the ratio is from about 4:1 to about 25:1. The resulting detergent is an overbased detergent that will typically have a TBN of about 150 or higher, often about 250 to 450 or more. Preferably, the overbasing cation is sodium, calcium, or magnesium. A mixture of detergents of differing
TBN can be used in the present invention. 16047] Preferred detergents include the alkali or alkaline earth metal salts of sulfonates, phenates, carboxylates, phosphates, and salicylates.
[8048] Sulfonates may be prepared from sulfonic acids that are typically obtained by sulfonation of alkyl substituted aromatic hydrocarbons. Hydrocarbon examples include those obtained by alkylating benzene, toluene, xylene, naphthalene, biphenyl and their halogenated derivatives (chlorobenzene, chlorotoluene, and chloronaphthalene, for example). The alkylating agents typically have about 3 to 70 carbon atoms. The alkaryl sulfonates typically contain about 9 to about 80 carbon or more carbon atoms, more typically from about 16 to 60 carbon atoms.
10049] Klamann in “Lubricants and Related Products”, op cit discloses a number of overbased metal salts of various sulfonic acids which are useful as detergents and dispersants in lubricants, The book entitled “Lubricant Additives”,
C.V. Smaltheer and RK. Smith, published by the Lezius-Hiles Co. of Cleveland,
Ohio (1967), similarly discloses a number of overbased sulfonates that are useful as dispersants/detergents.
[6658] Alkaline carth phenates are another useful class of detergent. These detergents can be made by reacting alkaline earth metal hydroxide or oxide (Ca0,
Ca(OH), BaQ, Ba{OH}),, MgO, Mg(OH),, for example} with an alkyl phenol or sulfurized alkyiphenol. Useful alkyl groups include straight chain or branched
Cy-Cyp alkyl groups, preferably, C4-Cy. Examples of suitable phenols include isobutyiphenol, Z-ethythexylphenol, nonyiphenol, dodecyl phenol, and the like. It should be noted that starting alkylphenols may contain more than one alkyl substituent that are cach independently straight chain or branched. When a non- sulfurized alkylphenol is used, the sulfurized product may be obtained by methods well known in the art. These methods include heating a mixture of alkylphenol and sulfurizing agent {including clemental sulfur, sulfur halides such as sulfur dichloride, and the like) and then reacting the sulfurized phenol with an alkaline carth metal base. 10051] Metal salts of carboxylic acids are also useful as detergents. These carboxylic acid detergents ray be prepared by reacting a basic metal compound with at least one carboxylic acid and removing free water frorn the reaction product. These corupounds may be overbased to produce the desired TBN level.
Detergents made from salicylic acid are one preferred class of detergents derived from carboxylic acids. Useful salicylates include long chain alkyl salicylates.
One useful family of compositions is of the formula o / 1 M 7 tJ i
X. / 2 where R is a hydrogen atom or an alkyl group having 1 to about 30 carbon atorus, n is an integer from 1 to 4, and M is an alkaline earth metal. Preferred R groups are alkyl chains of at least Cyy, preferably Cy; or greater. R may be optionally substituted with substituents that do not interfere with the detergent’s function. M is preferably, calcium, magnesium, or bartum. More preferably, M is calcium.
[6652] Hydrocarbyl-substituted salicylic acids may be prepared from phenols by the Kolbe reaction {see U.S. Patent 3,595,791). The metal salts of the hydrocarbyl-substituted salicylic acids may be prepared by double decomposition of a metal salt in a polar solvent such as water or alcohol.
[0053] Alkaline carth metal phosphates are also used as detergents. 10054] Detergents may be simple detergents or what 1s known as hybrid or complex detergents. The latter detergents can provide the properties of two detergents without the need to blend separate materials. See U.S. Patent 6,034,039, for example.
[8055] Preferred detergents include calcium phenates, calcium sulfonates, calcium salicylates, magnesium phenates, magnesium sulfonates, magnesium salicylates and other related components (including borated detergents).
Typically, the total detergent concentration is about 0.01 to about 6.0 wi%, preferably, about 0.1 to 3.5 wit%.
10656] Antioxidants retard the oxidative degradation of base oils during service. Such degradation may result in deposits on metal surfaces, the presence of sludge, or a viscosity increase in the lubricant, One skilled in the art knows a wide variety of oxidation inhibitors that are useful in lubricating oil compositions.
See, Klamann in Lubricants and Related Products, op cite, and U.S. Patents 4,798,684 and 5,084,197, for example.
[6657] Useful antioxidants include hindered phenols. These phenolic antioxidants may be ashless (metal-free) phenolic compounds or neutral or basic metal salts of certain phenolic compounds. Typical phenolic antioxidant compounds are the hindered phenolics which are the ones which contain a sterically hindered hydroxyl group, and these include those derivatives of dihydroxy aryl compounds in which the hydroxyl groups are in the o- or p-position to each other. Typical phenolic antioxidants include the hindered phenols substituted with Cy+ alkyl groups and the alkylene coupled derivatives of these hindered phenols. Examples of phenolic materials of this type 2-t-butyl- 4-heptyl phenol; Z-t-butyl-d-octyl phenol; 2-t-butyi-4-dodecyl phenol; 2,6-di-t-butyl-4-heptyl phenol; 2,6-di-t-butyl-4-dodecyl phenol; 2-methyl- 6-t-butyl-4-heptyl phenol; and 2-methyl-6-t-butyl-4-dodecy! phenol. Other useful hindered mono-phenolic antioxidants may include for example hindered 2,6-di- alkyl-phenolic proprionic ester derivatives. Bis-phenelic antioxidants may also be advantageously used in combination with the instant invention. Examples of ortho-coupled phenols include: 2,2 -bis(4-heptyl-6-t-butyl-phenol}; 2,27 -bis(4-octyl-6-t-butyl-phenol); and 2,2'-bis{4-dodecyl-6-t-butyl-phenol).
Para-coupled bisphenols include for example 4,4 -bis(2,6-di-t-butyl phenol} and 4,4 -methylene-bis{2,6-di-t-butyl phenol). 10058] Non-phenolic oxidation inhibitors which may be used include aromatic amine antioxidants and these may be used either as such or in combination with phenolics. Typical examples of von-phenolic antioxidants include: alloylated and non-allkylated aromatic amines such as aromatic monoamines of the formula
RER7R''N where RY is an aliphatic, aromatic or substituted aromatic group, R’ is an aromatic or a substituted aromatic group, and RY is H, alkyl, aryl or
RYMS(03xR™ where R'is an alkylene, alkenylene, or aralkylene group, RY is a higher alkyl group, or an alkenyl, aryl, or alkaryl group, and x 18 0, 1 or 2. The aliphatic group R® may contain from 1 to about 20 carbon atoms, and preferably contains from about 6 to 12 carbon atoms. The aliphatic group is a saturated aliphatic group. Preferably, both R® and R” are aromatic or substituted aromatic groups, and the aromatic group may be a fused ring arowatic group such as naphthyl. Aromatic groups R® and R” may be joined together with other groups such as S.
[0059] Typical aromatic amines antioxidants have alkyl substituent groups of at least about 6 carbon atoms. Examples of aliphatic groups include hexyl, heptyl, octyl, nonyl, and decyl. Generally, the aliphatic groups will not contain more than about 14 carbon atoms. The general types of amine antioxidants useful in the present compositions include diphenylamines, phenyl naphthylamines, phenothiazines, imidodibenzyls and diphenyl phenylene diamines. Mixtures of two or more aromatic amines are also useful. Polymeric amine antioxidants can also be used. Particular examples of aromatic amine antioxidants useful in the present invention include: pp -dioctyldiphenylamine; t-octviphenyl-alpha- naphthylaminge; phenyl-alphanaphthylamine; and p-octylphenyl-alpha- naphthylamine. 10066] Sulfurized alkyl phenols and alkali or alkaline earth wetal salts thereof also are useful antioxidants.
[8861] Preferred antioxidants include hindered phenols, arylamines. These antioxidants may be used individually by type or in combination with one another.
Such additives may be used in an amount of about 0.01 to 5 wi%, preferably about 0.01 to 1.5 wt%, more preferably zero to less than 1.5 wt%, most preferably
ZETO. 18662] Conventional pour point depressants (also known as lube oil flow improvers} may be added to the compositions of the present invention if desired.
These pour point depressant may be added to lubricating compositions of the present invention to lower the minimum temperature at which the fluid will flow or can be poured. Examples of suitable pour point depressants include poly- methacrylates, polvacrylates, polvarviamides, condensation products of haloparaffin waxes and aromatic compounds, vinyl carboxylate polymers, and terpolymers of diallylfumarates, vinyl esters of fatty acids and allyl vinyl ethers.
U.S. Patent Nos. 1,815,022; 2,015,748; 2,101,498; 2,387,501; 2,655,479; 2,666,746; 2,721,877; 2,721,87%; and 3,250,715 describe useful pour point depressants and/or the preparation thereof. Such additives may be used in an amount of about 0.01 to 5 wt%, preferably about 0.01 to 1.5 wt%. 10063] Scal compatibility agents help to swell clastomeric seals by causing a chemical reaction in the fluid or physical change in the elastomer. Suitable seal compatibility agents for lubricating oils include organic phosphates, aromatic esters, aromatic hydrocarbons, esters (butylbenzyl phthalate, for example), and polybutenyl succinic anhydride. Such additives may be used in an amount of about 0.01 to 3 wt%, preferably about 0.01 to 2 wis,
[8064] Anti-foam agents may advantageously be added to lubricant compositions. These agents retard the formation of stable foams. Silicones and organic polymers are typical anti-foam agents. For example, polysiloxanes, such as silicon oil or polydimethyl siloxane, provide antifoam propertics. Anti-foam agents are commercially available and may be used in conventional minor amounts along with other additives such as demulsifiers; usually the amount of these additives combined is less than | percent and often less than 0.1 percent.
~20 - 18665] A friction modifier 1s any material or materials that can alter the coefficient of friction of a surface lubricated by any lubricant or fluid containing such material(s). Friction modifiers, also known as friction reducers, or lubricity agents or oiliness agents, and other such agents that change the ability of base oils, formulated lubricant compositions, or functional fluids, to modify the coefficient of friction of a lubricated surface may be effectively used tn combination with the base oils or lubricant compositions of the present invention if desired. Friction modifiers that lower the coefficient of friction are particularly advantageous in combination with the base oils and lube compositions of this invention. Friction modifiers may include wetal-containing compounds or materials as well as ashless compounds or materials, or mixtures thereof. Metal-countaining friction modifiers may include metal salts or metal-ligand complexes where the metals may include alkali, alkaline earth, or transition group wetals., Such metal containing friction modifiers roay also have low-ash characteristics. Transition metals may include Mo, Sb, Sn, Fe, Cu, Zn, and others. Ligands may include hydrocarbyl derivative of alcohols, polyols, glvcerols, partial ester glycerols, thiols, carboxylates, carbamates, thiocarbamates, dithiocarbamates, phosphates, thiophosphates, dithiophosphates, amides, imides, amines, thiazoles, thiadiazoles, dithiazoles, diazoles, triazeles, and other polar molecular functional groups containing effective amounts of GO, NU S, or P, individually or in combination. In particular, Mo-containing compounds can be particularly effective such as for example Mo-dithiocarbamates, Mo{DDTC), Mo-dithiophosphates, Mo(DTP),
Mo-amines, Mo{Am), Mo-alcoholates, Mo-alcohol-amides, etc. See U.S. Patents 5,824,627; 6,232,276; 6,153,564; 6,143,701; 6,110,878; 5,837,657; 6,010,987, 5,806,908; 6,734,150; 6,730,638; 6,089,725; 6,569.820; and WO 99/66013;
WO 99/47629; WO 08/26030. 18066] Ashless friction modifiers may have also mnclude lnbricant materials that contain effective amounts of polar groups, for example, hydroxyl-containing hydrocarbyl base oils, glycerides, partial glycerides, glyeeride derivatives, and the like, Polar groups in friction modifiers may include hydrocarbyl groups containing effective amounts of QO, N, §, or P, individually or in combination.
Other friction modifiers that may be particularly effective include, for example, salts (both ash-containing and ashless derivatives) of fatty acids, fatty alcohols, fatty amides, fatty esters, hydroxyi-containing carboxylates, and comparable syathetic long-chain hydrocarbyl acids, alcohols, amides, esters, hydroxy carboxylates, and the like. lu some instances fatty organic acids, fatty amines, and sulfurized fatty acids may be used as suitable friction modifiers.
[6067] Useful concentrations of friction medifiers may range from about 0.01 wt% to 10-15 wit% or more, often with a preferred range of about 0.1 wil to 5 wt%. Concentrations of molyvbdenum-containing materials are often described in terms of Mo metal concentration. Advantageous concentrations of Mo may range from about 10 ppm to 3000 ppm or more, and often with a preferred range of about 20-2000 ppm, and in some instances a more preferred range of about 30-1000 ppm. Friction modifiers of all types may be used alone or in mixtures with the materials of this invention. Often mixtures of two or more friction modifiers, or mixtures of friction modifier(s) with alternate surface active material{s}, are also desirable. 10068] When lubricating oil compositions contain one or more of the additives discussed above, the additive(s) are blended into the composition in an amount sufficient for it to perform Us intended function. Typical amounts of such additives useful in the present invention are shown in Table A below.
[8069] Note that many of the additives are shipped from the manufacturer and used with a certain amount of base oil diluent in the formulation. Accordingly, the weight amounts in the table below, as well as other amounts mentioned in this specification, are directed to the amount of active ingredient (that is the non-
SOD diluent portion of the ingredient). The wi% indicated below are based on the total weight of the lubricating oil composition.
TABLE 1
Typical Amounts of Various Lubricant Oil Components
Approximate Approximate
Compound wit% wt% (Preferred) {Useful)
Detergent 0016 004
Dispersant 0.1-20 0.1-8
Friction Modifier 0.01-5 0.01-1.5
Viscosity Index hmprover 0.01-4, more preferably {solid polymer basis) 0-0-4 0.01-2, most preferably
Antioxidant 0.1-5 0.1-1.5
Auti-wear Additive 0.01-6 0.01-4
Pour Point Depressant 0.0-5 0.01-1.5 (PPI)
Auti-foam Agent 0.001-3 0.001-0.15
Base stock or base oil Balance Balance
[0078] The foregoing additives are all commercially available materials,
These additives may be added independently but are usually precombined in packages which can be obtained from suppliers of lubricant oil additives.
Additive packages with a variety of ingredients, proportions and characteristics are available and selection of the appropriate package will take the requisite use of the ultimate composition into account. 10671] The following non-limiting examples are provided to illustrate the mvention,
10672] Lubricating oil compositions according to the invention were prepared using a blend of PAO, ester and Group HI base oils, $G73 In addition to a metal detergent, viscosity index immprover, and ZDDP i gent, ¥ p ; the coraposition included borated and non-borated ashless dispersant, phenolic and aminic antioxidants, defoamant, pour point depressant, friction modifier and seal swelling agent.
[0074] Representative formulations are given in Table 2.
TABLE 2 invention | Invention { emp. {enmp, Comp. {emp Comp,
Formuladon 0 Ex dl | Ex? 0 Exd | Exd | Exd | Exg | ExJ
Viscosity Grade | OW-20 | OW-20 | OW-30 | OW-20 | SW-30 | SW-30 | SW-30
Salicylate and/or
Sulfonate
Detergent | 220 | 180 | 225 | 150 | 352 | 352 | 150
Friction Modifier | 015 | 015 | 01S | 048 | 073 | 077 | 040
Viscosity Index fmprover (solid polymer content) | 0.37 0.57 0.37 0.56 0.71 (3.66 (3.86
ZDDP | 0.80 0.91 | 0.80 0.86
Dispersant (Borated/Non-
Borated) 7.97 710 | 820 | 435 4.25 610 | 455
Other Addtives (antioxidant, defoamant, PPD,
Baseoil | balance | balance | balance | balance | balance | balance | balance
Formulated Oil
KV@I00C, ¢St | 3.6 g8 1 12.1 8.5 11.0 Tid 10.8
Sulfated Ash 06 0.6 | 06 0.9
Sulfur 02 0.2
“04 10675] Among the features of the composition of the invention is that they have demonstrated both unexpected combination of wear and fuel efficiency performance. For instance, {ucl economy is improved by at least 3.2% as measured in the M111 FE engine test and while the wear performance is improved relative to the comparison oils. Additionally, the composition of the invention is a low sulfated ash, low sulfur composition.
[6676] Performance evaluation of the formulations is given in Table 3-6. The following engine tests were performed to measure wear and fuel economy of the engine oil hubricant composition of the present invention: TU3M, Sequence HIG {ASTM D7328), OM6461LA and M1TIFE, all of which are incorporated herein by reference.
TABLE 3
Invention | Invention | Comp. | Comp. | Comp, | Comp, | Comp,
Description Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 8 Ex. 0 Ex. 7
HTHS, ef at asec 2d EL 38 26 0 30 1 30 | 30
NMigeosity Grade | OW20 | OW-20 | OWS30 | OW-20 | SWo3U | SWAG | SWRA)
Engine fest Parameter
Valve Train
TUM Scuffing Wear
CEC L- | Average cam 03894 wear jun | 18 1 38 4 2 p34 36 LT 129]
Maximum
CAIN WAT, Ui 3.2 4.5 2.6 5.5 5.5 8 3.0
~ 25.
TABLE 4 on | a | a
Description Ex 1 Ex 2 Ex 3 Ex. 4 Ex 5 Ex. 6 Ex, 7
HTHS, ef at : asec |b 27 428 | 35 | 26 | 30 | 30 i 30
Viscosity Grade i OW-20 | OW-20 | OW-30 | 0W-20 | SW-30 | SW-30 | SW-30
Engine | : :
Test Parameter i
HG : :
ASTM | Wearand Of 07320 | Thickening
Average carn | : : and lifter : : :
TABLE 3 nm,
Deseription Ex 1 | Ex? Ex d Ex 4 Ex. 3 Ex. 6 Esl
Ta Lal lal at 156°C | 2.7 i 2.8 3.5 2.6 3.6 3.6 3.0
Enging :
CEC Main bearing | . £-099-08 | wear, wn 00 1 02 0.4 0.2 Poms g7 0.7 lew eo we |e Les | as
Wear, {im 00 | ol 0.2 EHX 0.5
Cam wear outlet Loma
Cans), um 55.0 27.9 67.3 89.7 bia 5302 118.6 (avg. max wear 8 hina
TABLE 6
Invention | Invention Comp. Comp, | Comp, | Comp, | Comp.
Deseription. ERR ERS DERE ERD Ene ERD
HTHS, FP at 156°C 2.7 2.8 35 126 3.0 3.0 3.0
Viscosity Grade OW-20 OW-30 | OW-20 | SW-30 | SW.-30
Eoging
MIFE FuelBeonowy | | + 0.
Fuel Economy
CEC Improvement, Lo a 1054-96 | % 3.3 34 26 Loma] 31 Foma | 29 [86771 As can be seen from the foregoing Tables, the composition of the invention provided improved antiwear properties while providing a substantial improvement in fuel economy when compared to the other oils identified. 10678] It will thus be scen that the objects set forth above, among those apparent in the preceding description, are efficiently attained and, since certain changes may be wade in carrying out the present invention without departing from the spirit and scope of the invention, it is intended that all matter contained in the above description and shown in the accoropanying drawing be interpreted as tlustrative and not in a limiting sense. 18679] It is also understood that the following claims are intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention, which as a matter of language, might be said to fall therebetween.
Claims (1)
- ST CLAIMS:I. Au engine oil lubricant composition comprising a major amount of base oil and an effective amount of a zine diabioyl dithio phosphate, a polymeric viscosity index improver and a mixture of alkaline earth wetal detergents, wherein said engine oil lubricant composition has having a sulfated ash content of less than about 0.8 wt% and an HTHS of less than about 2.9 cP at 150°C.2. The lubricant composition of claim 1, wherein the alkaline carth metal detergents are selected from metallic salicylates and sulfonates,3. The lubricant composition of claim 2, wherein the metallic salicylates and sulfonates ave selected {ror calcium and magnesium.4. The lubricant composition of claim 1, wherein the polymeric viscosity index improver has a weight average molecular weight greater than about 500,000.5. The lubricant cornposition of claim 4, wherein the polymeric viscosity index improver has a number average molecular weight greater than about 300,000.6. The lubricant composition of claim 1, wherein the polymeric viscosity index improver is selected from a hydrogenated star polyisoprene, styrene-isoprene block co-polymer and ethylene-propylene copolymer.7. The lubricant composition of claim 1, wherein the ZDDP is a secondary dialloyl dithiophosphate.8. The lubricant composition of claim 1, further comprising a mixture of at least two dispersants wherein at least one dispersant is a borated succinimide.9. A engine oil lubricant composition comprising a major amount of base oil and an effective amount of a zinc dialkyl dithio phosphate, a polymeric viscosity modifier present in an amount of less than about 1.0 wit% solid polymer content and a mixture of detergents selected from salicylates and sulfonates, wherein said engine oil lubricant composition has having a sulfated ash content of less than about 0.8 wt%.19. A method for improving fuel efficiency and wear in an engine, said method comprising i} adding to said engine an engine oil lubricant composition having a sulfated ash content of about 0.8 wt% and an HTHS of about2.9 cP at 150°C, said lubricant composition comprising a zinc Oo dialkyl dithio phosphate, a polymeric viscosity modifier and a mixture of alkaline earth metal detergents.11. The method of claim 10, wherein the alkaline earth metal detergents are selected from metallic salicylates and sulfonates.12. The method of claim 11, wherein the metallic salicylates and sulfonates are selected from calcium and magnesium.13. The method of claim 10, wherein the polymeric viscosity index improver has a weight average molecular weight greater than about 500,000. 14, The method of claim 13, wherein the polymeric viscosity index improver has a number average molecular weight greater than about 300,000.15. The method of claim 10, wherein the polymeric viscosity index mmprover is selected from a hydrogenated star polyisoprene, styrenc-isoprene block co~polymer and cthylene-propylenc copolymer.16. The method of claim 1, wherein the ZDDP is a secondary dialkyl dithiophosphate.17. The method of claim 1, further comprising a mixture of at least two dispersants wherein at least one dispersant is a borated succinimide.
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US9574158B2 (en) * | 2014-05-30 | 2017-02-21 | Afton Chemical Corporation | Lubricating oil composition and additive therefor having improved wear properties |
US20190270946A1 (en) * | 2018-03-02 | 2019-09-05 | Chevron Oronite Technology B.V. | Lubricating oil composition providing wear protection at low viscosity |
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-
2012
- 2012-06-26 US US13/533,259 patent/US20130005622A1/en not_active Abandoned
- 2012-06-27 WO PCT/US2012/044305 patent/WO2013003406A1/en active Application Filing
- 2012-06-27 SG SG2013072582A patent/SG193975A1/en unknown
- 2012-06-27 EP EP12733373.0A patent/EP2726586A1/en not_active Withdrawn
- 2012-06-27 SG SG10201604783VA patent/SG10201604783VA/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2013003406A1 (en) | 2013-01-03 |
EP2726586A1 (en) | 2014-05-07 |
US20130005622A1 (en) | 2013-01-03 |
SG10201604783VA (en) | 2016-08-30 |
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