Lubricating oil composition

• US 6,300,291 B1
• Filed: 05/19/1999
• Issued: 10/09/2001
• Est. Priority Date: 05/19/1999
• Status: Expired due to Term

• Current Assignee: Infineum USA LP (Infineum)
• Original Assignee: Infineum USA LP (Infineum)
• Inventors: Bell, Ian A. W., Miyoshi, Taisuke, Farnsworth, Gordon R., Hartley, Rolfe J., Waddoups, Malcolm, Bidwell, Thomas R.
• Primary Examiner(s): Medley, Margaret
• Assistant Examiner(s): Toomer, Cephia D.
• Application Number:
  US09/314,510
• Time in Patent Office: 874 Days
• Field of Search: 508/363, 508/371, 508/364, 508/365, 508/391, 508/545
• US Class Current: 508/363
• CPC Class Codes: C10M 101/02 Petroleum fractions
• CPC Class Codes: C10M 129/10 having hydroxy groups bound to a carbon atom of a six-membered aromatic ring
• CPC Class Codes: C10M 129/40 monocarboxylic
• CPC Class Codes: C10M 129/54 containing hydroxy groups
• CPC Class Codes: C10M 133/08 containing hydroxy groups
• CPC Class Codes: C10M 133/16 Amides; Imides
• CPC Class Codes: C10M 135/14 having a carbon-to-sulfur double bond
• CPC Class Codes: C10M 135/18 thiocarbamic type, e.g. containing the groups
• CPC Class Codes: C10M 137/10 Thio derivatives
• CPC Class Codes: C10M 141/10 at least one of them being an organic phosphorus-containing compound
• CPC Class Codes: C10M 159/18 Complexes with metals
• CPC Class Codes: C10M 159/20 Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products
• CPC Class Codes: C10M 159/22 containing phenol radicals
• CPC Class Codes: C10M 159/24 containing sulfonic radicals
• CPC Class Codes: C10M 163/00 Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• 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 2203/1045 : used as base material
• CPC Class Codes: C10M 2203/1065 : used as base material
• CPC Class Codes: C10M 2203/1085 : used as base material
• 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 2207/028 : Overbased salts thereof
• CPC Class Codes: C10M 2207/09 : Metal enolates, i.e. keto-enol metal complexes
• CPC Class Codes: C10M 2207/125 : having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
• CPC Class Codes: C10M 2207/126 : monocarboxylic
• CPC Class Codes: C10M 2207/129 : having hydrocarbon chains of thirty or more carbon atoms
• CPC Class Codes: C10M 2207/144 : containing hydroxy groups
• CPC Class Codes: C10M 2207/146 : having carboxyl groups bound to carbon atoms of six-membeered aromatic rings having a hydrocarbon substituent of thirty or more carbon atoms
• CPC Class Codes: C10M 2207/26 : Overbased carboxylic acid salts
• CPC Class Codes: C10M 2207/262 : derived from hydroxy substituted aromatic acids, e.g. salicylates
• 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 2215/08 : Amides
• CPC Class Codes: C10M 2215/082 : containing hydroxyl groups; Alkoxylated derivatives
• CPC Class Codes: C10M 2215/086 : Imides
• CPC Class Codes: C10M 2215/12 : Partial amides of polycarboxylic acids
• CPC Class Codes: C10M 2215/122 : Phtalamic 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 2219/044 : Sulfonic acids, Derivatives thereof, e.g. neutral salts
• CPC Class Codes: C10M 2219/046 : Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2219/062 : having carbon-to-sulfur double bonds
• CPC Class Codes: C10M 2219/066 : Thiocarbamic type compounds
• CPC Class Codes: C10M 2219/068 : Thiocarbamate metal salts
• CPC Class Codes: C10M 2219/089 : Overbased salts
• CPC Class Codes: C10M 2223/045 : Metal containing thio derivatives
• CPC Class Codes: C10M 2223/065 : containing sulfur
• CPC Class Codes: C10M 2227/061 : Esters derived from boron
• CPC Class Codes: C10M 2227/09 : Complexes with metals
• CPC Class Codes: C10N 2010/00 : Metal present as such or in compounds
• CPC Class Codes: C10N 2010/04 : Groups 2 or 12
• CPC Class Codes: C10N 2010/12 : Groups 6 or 16
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines
• CPC Class Codes: C10N 2040/251 : Alcohol fueled engines
• CPC Class Codes: C10N 2040/252 : Diesel engines
• CPC Class Codes: C10N 2040/253 : Small diesel engines
• CPC Class Codes: C10N 2040/255 : Gasoline engines
• CPC Class Codes: C10N 2040/28 : Rotary engines
• CPC Class Codes: C10N 2070/02 : Concentrating of additives

Abstract

A lubricating oil composition exhibiting improved low temperature anti-wear performance and improved fuel economy and fuel economy retention properties, which comprises: (a) an oil of lubricating viscosity; (b) at least one calcium detergent; (c) at least one oil soluble molybdenum compound; (d) at least one nitrogen containing friction modifier; and (e) at least one zinc dihydrocarbyldithiophosphate compound, wherein the composition has a NOACK volatility of about 15.5 wt. % or less and contains from about 0.058 to 0.58 wt. % calcium from the calcium detergent, molybdenum in an amount up to about 350 ppm from a molybdenum compound, and phosphorus in an amount up to about 0.1 wt. % from a zinc dihydrocarbyldithiophosphate compound.

Claims

1. A lubricating oil composition which exhibits improved low temperature anti-wear performance, improved fuel economy and fuel economy retention properties, said composition comprising:

a) an oil of lubricating viscosity having a viscosity index of at least 95;

b) at least one calcium detergent;

c) at least one oil soluble molybdenum compound;

d) at least one nitrogen containing friction modifier; and

e) at least one zinc dihydrocarbyldithiophosphate compound,

wherein said composition has a NOACK volatility of about 15.5 wt. % or less, from about 0.058 to 0.58 wt. % calcium from the calcium detergent, molybdenum in an amount up to about 350 ppm from the molybdenum compound, and phosphorus in an amount up to about 0.1 wt. % from the zinc dihydrocarbyldithiophosphate compound.

2. The composition according to claim 1 wherein said calcium detergent is selected from the group consisting of calcium phenates, calcium salicylates, calcium sulfonates, and mixtures thereof.

3. The composition according to claim 1 wherein said calcium detergent is an overbased calcium sulfonate.

4. The composition according to claim 3 wherein said overbased calcium sulfonate has a total base number of between about 150 to 450.

5. The composition according to claim 1 wherein said molybdenum from a molybdenum compound is present in an amount of about 10 ppm to 350 ppm.

6. The composition according to claim 5 wherein said molybdenum from a molybdenum compound is present in an amount of about 30 ppm to 200 ppm.

7. The composition according to claim 1 wherein said molybdenum compound is an organo-molybdenum compound.

8. The composition according to claim 1 wherein said molybdenum compound is selected from the group consisting of:

a molybdenum dialkyldithiocarbamate, molybdenum dialkyldithiophosphate, molybdenum dialkyldithiophosphinate, molybdenum xanthate, molybdenum thioxanthate, and mixtures thereof.

9. The composition according to claim 8 wherein said molybdenum compound is present as molybdenum dialkyldithiocarbamate.

10. The composition according to claim 1 wherein said molybdenum compound is a trinuclear molybdenum compound.

11. The composition according to claim 1 wherein said molybdenum compound is a molybdenum/sulfur complex of a basic nitrogen compound.

12. The composition according to claim 1 wherein said at least one zinc dihydrocarbyldithiophosphate compound comprises zinc from a primary alkyl group, secondary alkyl group, or mixtures thereof.

13. The composition according to claim 12 wherein said at least one zinc dihydrocarbyldithiophosphate compound comprises at least about 50 mole % primary zinc from a dihydrocarbyldithiophosphate compound.

14. The composition according to claim 1 wherein said at least one nitrogen containing friction modifier is an ethoxylated amine.

15. The composition according to claim 1 wherein said phosphorus content is about 0.025 wt. % to 0.1 wt. % from the zinc dihydrocarbyldithiophosphate compound.

16. A method for improving the fuel economy and fuel economy retention properties of an internal combustion engine, which comprises:

(1) adding to said engine the lubricating oil composition of claim 1; and

(2) operating said engine.

17. A method for improving the anti-wear protection of an internal combustion engine comprising the steps of:

(1) adding a lubricating oil composition which exhibits improved fuel economy and fuel economy retention properties to an engine, said composition comprising;

(a) an oil of lubricating viscosity;

(b) at least one calcium detergent;

(c) at least one oil soluble molybdenum compound;

(d) at least one nitrogen containing friction modifier; and

(e) at least one zinc dihydrocarbyldithiophosphate compound,

wherein said composition has a NOACK volatility of about 15.5 wt. % or less, from about 0.058 to 0.58 wt. % calcium from the calcium detergent, molybdenum in an amount up to about 350 ppm from the molybdenum compound, and phosphorus in an amount up to about 0.1 wt. % from the zinc dihydrocarbyldithiophosphate compound; and

(2) operating the engine, thereby obtaining an average cam lobe wear of less than 100 microns as measured by the ASTM Sequence IVA Test.

18. A concentrate for blending with an oil of lubricating viscosity, said concentrate comprising:

(a) at least one calcium detergent;

(b) at least one oil soluble molybdenum compound;

(c) at least one nitrogen containing friction modifier; and

(d) at least one zinc dihydrocarbyldithiophosphate compound, to provide a lubricating oil composition having a NOACK volatility of about 15.5 wt. % or less, from about 0.058 to 0.58 wt. % calcium from the calcium detergent, molybdenum in an amount up to about 350 ppm from the molybdenum compound, and phosphorus in an amount up to about 0.1 wt. % from the zinc dihydrocarbyldithiophosphate compound.