Molybdenum sulfur antiwear and antioxidant lube additives

• US 4,995,996 A
• Filed: 12/14/1989
• Issued: 02/26/1991
• Est. Priority Date: 12/14/1989
• Status: Expired due to Fees

• Current Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Original Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Inventors: Greaney, Mark A., Stiefel, Edward I., Coyle, Catherine L., Beltzer, Morton, Francis, James N.
• Primary Examiner(s): Chaudhuri, Olik
• Assistant Examiner(s): MCAVOY, ELLEN M
• Application Number:
  US07/450,751
• Time in Patent Office: 439 Days
• Field of Search: 252/42.7
• US Class Current: 508/445
• CPC Class Codes: C10M 135/14 having a carbon-to-sulfur double bond
• CPC Class Codes: C10M 159/18 Complexes with metals
• CPC Class Codes: C10M 2219/062 having carbon-to-sulfur double bonds
• CPC Class Codes: C10N 2010/12 Groups 6 or 16
• CPC Class Codes: C10N 2070/02 Concentrating of additives

Abstract

In accordance with this invention, there is provided a lubricating composition comprising a major amount of an oil of lubricating viscosity and a minor amount of an additive having the formula Mo₂ L₄ wherein L is a ligand selected from xanthates and mixtures thereof and, in particular, xanthates having a sufficient number of carbon atoms to render the additive soluble in the oil. In general, the xanthate ligand, L, will have form about 2 to 30 carbon atoms.

Claims

1. A lubricating composition comprising:

a major amount of an oil of lubricating viscosity; and

, a minor amount of an additive having the formula Mo₂ L₄ wherein L is a ligand selected from a xanthate and mixtures of xanthates.

2. The composition of claim 1 wherein the ligand, L, has organo groups having carbon atoms in an amount sufficient to render the additive soluble in the oil.

3. The composition of claim 2 wherein the amount of the additive is in the range of from about 0.01 to about 10 weight percent based on the weight of oil.

4. The composition of claim 3 wherein the organo groups are selected from alkyl, aralkyl and alkoxylalkyl ether groups.

5. The composition of claim 4 wherein the organo groups are alkyl groups and the number of carbon atoms in the alkyl groups of the ligand, L, are in the range of from about 2 to about 30.

6. A lubricating composition comprising:

a major amount of an oil selected from natural and synthetic oils having viscosities in the range of from about 5 to about 26 centistokes at 100°

C., and from about 0.01 to about 10 weight percent of an additive having the formula Mo₂ L₄, wherein L is selected from a xanthate and mixtures of xanthates and wherein the ligand, L, has organo groups having from about 2 to about 30 carbon atoms.

7. The composition of claim 6 wherein the additive is present in an amount ranging from about 0.1 to about 1.0 weight percent.

8. An additive concentrate for blending with lubricating oils to provide a lubricating composition having antiwear, antioxidant and friction reducing properties comprising:

a hydrocarbon diluent and from about 1 to about 90 weight percent of an additive, based on the weight of diluent, the additive having the formula Mo₂ L₄ wherein L is a ligand selected from xanthate and mixtures thereof and wherein the ligand, L, has organo groups having from about 1 to about 30 carbon atoms.

9. The concentrate of claim 8 wherein the diluent is an aromatic hydrocarbon and the additive ranges between about 20 to about 70 weight percent, based on the weight of diluent.