Antioxidant combinations of molybdenum complexes and organic sulfur compounds for lubricating oils

• US 4,402,840 A
• Filed: 07/01/1981
• Issued: 09/06/1983
• Est. Priority Date: 07/01/1981
• Status: Expired due to Term

• Current Assignee: Chevron Research Company (Chevron Corp.)
• Original Assignee: Chevron Research Company (Chevron Corp.)
• Inventors: King, John M., deVries, Louis
• Primary Examiner(s): Shine, W. J.
• Application Number:
  US06/279,294
• Time in Patent Office: 797 Days
• Field of Search: 252/32.7 E, 252/32.7 HC, 252/42.7, 252/45, 252/46.4, 252/49.7, 252/400 R, 252/400 A
• US Class Current: 508/362
• CPC Class Codes: C10M 133/58 Heterocyclic compounds
• 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 2207/09 Metal enolates, i.e. keto-enol metal complexes
• CPC Class Codes: C10M 2219/02 Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
• 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 2219/08 Thiols; Sulfides; Polysulfides; Mercaptals
• CPC Class Codes: C10M 2219/082 containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2219/085 containing carboxyl groups; Derivatives thereof
• CPC Class Codes: C10M 2219/086 containing sulfur atoms bound to carbon atoms of six-membered aromatic rings
• CPC Class Codes: C10M 2219/087 containing hydroxy groups; Derivatives thereof, e.g. sulfurised phenols
• CPC Class Codes: C10M 2219/089 Overbased salts
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10M 2227/09 Complexes with metals
• CPC Class Codes: C10N 2010/02 Groups 1 or 11
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2010/06 Groups 3 or 13
• CPC Class Codes: C10N 2010/08 Groups 4 or 14
• CPC Class Codes: C10N 2010/12 Groups 6 or 16
• CPC Class Codes: C10N 2010/14 Group 7
• CPC Class Codes: C10N 2010/16 : Groups 8, 9, or 10
• CPC Class Codes: C10N 2070/02 : Concentrating of additives

Abstract

An antioxidant additive combination for lubricating oils is prepared by combining (a) a sulfur containing molybdenum compound prepared by reacting an ammonium tetrathiomolybdate, and a basic nitrogen compound, with (b) an organic sulfur compound.

Claims

1. A lubricating oil additive comprising a combination of

(a) an oil soluble sulfur containing molybdenum complex prepared by (1) reacting an ammonium tetrathiomolybdate and a basic nitrogen compound selected from the group consisting of a Mannich base, phosphonamide, thiophosphonamide, phosphoramide, dispersant viscosity index improvers, or mixtures thereof to form a molybdenum complex wherein from 0.01 to 2 atoms of molybdenum are present per basic nitrogen atom, and

(b) an oil soluble organic sulfur compound or mixtures thereof, wherein the organic sulfur compound of component (b) is present in an amount of from 0.02 to 10 parts by weight per part by weight of the sulfur containing molybdenum complex of component (a).

2. The oil additive of claim 1 wherein the sulfur compound of component (b) is selected from the group consisting of a metal dihydrocarbyl dithiophosphate, a metal dithiocarbamate, sulfurized olefins, hydrocarbyl sulfides, and polysulfides, sulfurized carboxylic acid esters, sulfurized alkylphenols, reaction product of an olefin and sulfurized alkylphenol, and phosphosulfurized terpenes or mixtures thereof.

3. The additive of claim 2 wherein the sulfur compound is selected from the group consisting of sulfurized olefins, hydrocarbyl mono and disulfides, sulfurized alkylphenols, and the reaction product of an olefin and sulfurized alkylphenol.

4. The oil additive of claim 3 wherein the hydrocarbyl mono and disulfide is a compound having the formula

5. The oil additive of claim 4 wherein R₅ and R₆ are each alkyl containing 1 to 40 carbon atoms.

6. The oil additive of claim 4 wherein the hydrocarbyl mono or disulfide is selected from the group consisting of diphenyl sulfide, didodecyl sulfide, didecyldisulfide, dilaurylthiodipropionate or distearylthiodipropionate.

7. The oil additive of claim 1 wherein said basic nitrogen compound is a Mannich base prepared from a C_9-200 alkylphenol, formaldehyde, and an amine.

8. The oil additive of claim 7 wherein said basic nitrogen compound is a Mannich base prepared from dodecylphenol, formaldehyde, and methylamine.

9. The additive of claim 7 wherein said basic nitrogen compound is a Mannich base prepared from C_80-100 alkylphenol, formaldehyde and triethylene tetraamine, or tetraethylene pentaamine, or mixtures thereof.

10. A lubricating oil composition comprising an oil of lubricating viscosity and from 0.05 to 15 percent by weight of the additive of claim 1.

11. A lubricating oil concentrate composition comprising an oil of lubricating viscosity and from 15 to 90 percent by weight of the product of claim 1.