Lubricating compositions

• US 5,883,057 A
• Filed: 10/17/1997
• Issued: 03/16/1999
• Est. Priority Date: 01/16/1996
• Status: Expired due to Term

• Current Assignee: The Lubrizol Corporation (Berkshire Hathaway Incorporated)
• Original Assignee: The Lubrizol Corporation (Berkshire Hathaway Incorporated)
• Inventors: Roell, Bernard C. Jr., Scharf, Curtis R., Richardson, Robert C.
• Primary Examiner(s): Howard, Jacqueline V.
• Application Number:
  US08/953,698
• Time in Patent Office: 515 Days
• Field of Search: 508/469, 585/14
• US Class Current: 508/469
• CPC Class Codes: C10M 101/02 Petroleum fractions
• CPC Class Codes: C10M 107/08 containing butene
• CPC Class Codes: C10M 127/06 Alkylated aromatic hydrocarbons
• CPC Class Codes: C10M 129/10 having hydroxy groups bound to a carbon atom of a six-membered aromatic ring
• CPC Class Codes: C10M 129/72 of polycarboxylic acids
• CPC Class Codes: C10M 129/76 containing free hydroxy or carboxyl groups
• CPC Class Codes: C10M 133/08 containing hydroxy groups
• CPC Class Codes: C10M 133/12 having amino groups bound to a carbon atom of a six-membered aromatic ring
• CPC Class Codes: C10M 133/52 having a carbon chain of 30 or more atoms
• CPC Class Codes: C10M 133/56 Amides; Imides
• CPC Class Codes: C10M 135/04 Hydrocarbons
• CPC Class Codes: C10M 135/18 thiocarbamic type, e.g. containing the groups
• CPC Class Codes: C10M 135/30 containing hydroxy groups; Derivatives thereof
• CPC Class Codes: C10M 135/36 the ring containing sulfur and carbon with nitrogen or oxygen
• CPC Class Codes: C10M 137/02 having no phosphorus-to-carbon bond
• CPC Class Codes: C10M 137/10 Thio derivatives
• CPC Class Codes: C10M 143/00 Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
• CPC Class Codes: C10M 143/02 Polyethene
• CPC Class Codes: C10M 143/06 containing butene
• CPC Class Codes: C10M 143/08 containing aliphatic monomer having more than 4 carbon atoms
• CPC Class Codes: C10M 143/12 : containing conjugated diene
• CPC Class Codes: C10M 161/00 : Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 169/044 : the additives being a mixture of non-macromolecular and macromolecular compounds
• CPC Class Codes: C10M 2203/06 : Well-defined aromatic compounds
• CPC Class Codes: C10M 2203/10 : Petroleum or coal fractions, e.g. tars, solvents, bitumen
• CPC Class Codes: C10M 2203/1006 : used as base material
• CPC Class Codes: C10M 2203/102 : Aliphatic fractions
• CPC Class Codes: C10M 2203/1025 : used as base material
• CPC Class Codes: C10M 2203/104 : Aromatic fractions
• CPC Class Codes: C10M 2203/1045 : used as base material
• CPC Class Codes: C10M 2203/106 : Naphthenic fractions
• CPC Class Codes: C10M 2203/1065 : used as base material
• CPC Class Codes: C10M 2203/108 : Residual fractions, e.g. bright stocks
• CPC Class Codes: C10M 2203/1085 : used as base material
• CPC Class Codes: C10M 2205/00 : Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
• CPC Class Codes: C10M 2205/02 : containing acyclic monomers
• CPC Class Codes: C10M 2205/022 : Ethene
• CPC Class Codes: C10M 2205/026 : Butene
• CPC Class Codes: C10M 2205/0265 : used as base material
• CPC Class Codes: C10M 2205/028 : containing aliphatic monomers having more than four carbon atoms
• CPC Class Codes: C10M 2205/06 : containing conjugated dienes
• CPC Class Codes: C10M 2207/023 : having hydroxy groups bound to carbon atoms of six-membered aromatic rings
• CPC Class Codes: C10M 2207/026 : with tertiary alkyl groups
• CPC Class Codes: C10M 2207/027 : Neutral salts thereof
• CPC Class Codes: C10M 2207/282 : of (cyclo)aliphatic oolycarboxylic acids
• CPC Class Codes: C10M 2207/285 : of aromatic polycarboxylic acids
• CPC Class Codes: C10M 2207/286 : of polymerised unsaturated acids
• CPC Class Codes: C10M 2207/287 : Partial esters
• CPC Class Codes: C10M 2207/288 : containing free carboxyl groups
• CPC Class Codes: C10M 2207/289 : containing free hydroxy groups
• CPC Class Codes: C10M 2207/34 : Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
• CPC Class Codes: C10M 2209/084 : Acrylate; Methacrylate
• CPC Class Codes: C10M 2215/04 : having amino groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2215/042 : containing hydroxy groups; Alkoxylated derivatives thereof
• CPC Class Codes: C10M 2215/06 : having amino groups bound to carbon atoms of six-membered aromatic rings
• CPC Class Codes: C10M 2215/064 : Di- and triaryl amines
• CPC Class Codes: C10M 2215/065 : Phenyl-Naphthyl amines
• CPC Class Codes: C10M 2215/066 : Arylene diamines
• CPC Class Codes: C10M 2215/067 : Polyaryl amine alkanes
• CPC Class Codes: C10M 2215/068 : having amino groups bound to polycyclic aromatic ring systems, i.e. systems with three or more condensed rings
• CPC Class Codes: C10M 2215/223 : Five-membered rings containing nitrogen and carbon only
• CPC Class Codes: C10M 2215/24 : having hydrocarbon substituents containing thirty or more carbon atoms , e.g. nitrogen derivatives of substituted succinic acid
• CPC Class Codes: C10M 2215/26 : Amines
• CPC Class Codes: C10M 2215/28 : Amides; Imides
• CPC Class Codes: C10M 2217/046 : Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
• CPC Class Codes: C10M 2217/06 : Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
• CPC Class Codes: C10M 2219/022 : of hydrocarbons, e.g. olefines polyolefins C10M2221/041
• CPC Class Codes: C10M 2219/024 : of esters, e.g. fats
• CPC Class Codes: C10M 2219/066 : Thiocarbamic type compounds
• CPC Class Codes: C10M 2219/068 : Thiocarbamate metal salts
• CPC Class Codes: C10M 2219/087 : containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
• CPC Class Codes: C10M 2219/088 : Neutral salts
• CPC Class Codes: C10M 2219/089 : Overbased salts
• CPC Class Codes: C10M 2219/10 : Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
• CPC Class Codes: C10M 2219/102 : containing sulfur and carbon only in the ring
• CPC Class Codes: C10M 2219/104 : containing sulfur and carbon with nitrogen or oxygen in the ring
• CPC Class Codes: C10M 2219/106 : Thiadiazoles
• CPC Class Codes: C10M 2219/108 : Phenothiazine
• CPC Class Codes: C10M 2223/02 : having no phosphorus-to-carbon bonds
• CPC Class Codes: C10M 2223/041 : Triaryl phosphates
• CPC Class Codes: C10M 2223/045 : Metal containing thio derivatives
• CPC Class Codes: C10M 2223/047 : Thioderivatives not containing metallic elements
• CPC Class Codes: C10M 2223/049 : Phosphite
• CPC Class Codes: C10M 2223/10 : Phosphatides, e.g. lecithin, cephalin
• CPC Class Codes: C10M 2227/061 : Esters derived from boron
• CPC Class Codes: C10N 2020/01 : Physico-chemical properties
• CPC Class Codes: C10N 2040/02 : Bearings

Abstract

This invention relates to a lubricating composition comprising at least about 30% by weight of at least one mineral oil, having a kinematic viscosity of less than about 8 cSt at 100° C., (A) from about 5% to about 30% by weight at least one polymer having a Mw less than about 10,000, and (B) from about 2% to about 12% by weight of a polymer having a Mw greater than about 15,000, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test. The invention also relates to concentrates used in preparing shear stable lubricating compositions. The present combination of components provides good low and high temperature properties to mineral oils, even at high treat levels. These lubricants have good shear stability and in one aspect have improved oxidation resistance.

Claims

1. A lubricating composition comprising at least about 30% by weight of at least one mineral oil, having a kinematic viscosity of less than about 8 cSt at 100°

C., (A) from about 5% to about 30% by weight at least one polymer having a Mw less than about 10,000, and (B) from about 2% to about 12% by weight of a polymer derived from an α

-olefin which has from about 3to about 40 carbons atoms having a Mw greater than about 15,000, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test.

2. The composition of claim 1 wherein (A) and (B) are independently selected from the group consisting of a polyalkene or derivative thereof, an ethylene-α

-olefin copolymer, an ethylene-propylene polymer, an α

-olefin-unsaturated reagent copolymer, a polyacrylate, a polymethacrylate, a hydrogenated interpolymer of a vinyl substituted aromatic compound and a conjugated diene, and mixtures thereof.

3. The composition of claim 1 wherein (A) is a polyalkene having a Mw from about 1,000 up to about 9,000.

4. The composition of claim 3 wherein (A) is a polyalkene derived from at least one olefin having from 3 to about 30 carbon atoms.

5. The composition of claim 1 wherein (A) is polyisobutylene.

6. The composition of claim 1 wherein (B) has a Mw from about 15,000 to about 50,000.

7. The composition of claim 1 wherein (B) is selected from the group consisting of a polyalkene and ethylene-α

-olefin copolymer.

8. The composition of claim 7 wherein (B) has a polymodal molecular weight distribution.

9. The compositions of claim 1 further comprising (C) from about 5% to about 30% by weight of at least one fluidizing agent.

10. The composition of claim 9 wherein the fluidizing agent (C) is at least one member selected from the group consisting of an alkylated aromatic hydrocarbon, naphthenic oil, polyα

-olefins having a kinematic viscosity from about 3 to about 20 cSt at 100°

C., carboxylic acid esters, and mixtures thereof.

11. The composition of claim 1 further comprising (D) at least one antiwear or extreme pressure agent, (E) at least about 1.5% by weight of at least one antioxidant, or mixtures thereof.

12. The composition of claim 11 wherein the antiwear or extreme pressure agent (D) is at least one member selected from the group consisting of a sulfur compound, a phosphorus containing compound, a boron containing compound, and mixtures thereof.

13. The composition of claim 12 wherein the antioxidant (E) is selected from the group consisting of amine antioxidants, dithiophosphoric acid esters, phenol antioxidants, dithiocarbamate antioxidants, sulfurized Diels-Alder adducts, and mixtures thereof.

14. The composition of claim 1 wherein the lubricating composition is a gear oil.

15. A lubricating composition comprising at least about 30% by weight of a mineral oil, having a kinematic viscosity of less than about 8 cSt at 100°

C., (A) from about 5% to about 30% by weight of at least one polyalkene having Mw of less than 10,000, and (B) from about 2% to about 12% by weight of a polyalkene or an ethylene α

-olefin copolymer having a Mw greater than about 15,000, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test.

16. The composition of claim 15 wherein (A) is a polyalkene having a Mw from about 1,000 up to about 9,000.

17. The composition of claim 15 wherein (A) is polybutene.

18. The composition of claim 15 wherein (B) is selected from the group consisting a polybutene and an ethylene-α

-olefin copolymer.

19. The composition of claim 15 further comprising (C) from about 5% to about 30% by weight of at least one fluidizing agent.

20. The composition of claim 19 wherein the fluidizing agent (C) is at least one member selected from the group consisting of an alkylated aromatic hydrocarbon, naphthenic oil, polyα

-olefins having a kinematic viscosity from about 3 to about 20 cSt at 100°

C., carboxylic acid esters, and mixtures thereof.

21. The composition of claim 15 further comprising (D) from about 0.05% to about 10% at least one antiwear or extreme pressure agent, (E) at least about 1.5% by weight of at least one antioxidant, or mixtures thereof.

22. The composition of claim 15 further comprising an amount sufficient to deliver at least about 0.04% by weight nitrogen to the lubricating composition.

23. A concentrate comprising (A) from about 20% about 90% by weight of at least one polymer having a Mw less than about 10,000, (B) from about 8% to about 40% by weight of a polymer having a Mw greater than about 15,000, wherein a lubricating composition prepared from the concentrate has a shear loss of less than about 15% in the 20 hour Taper Bearing Shear Test.

24. The concentrate of claim 23 further comprising (C) from about 20% to about 70% by weight of at least one fluidizing agent.