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  Antiwear containing lubricating compositionUSPTO Application #: 20080103072Title: Antiwear containing lubricating composition Abstract: The present invention relates to a lubricating composition containing a sulphur-free metal salt of a hydrocarbyl-substituted phosphorus compound and an organo-sulphide. The composition has a sulphur content of greater than 0.3 weight percent of sulphur. The invention further provides for a method of lubricating a driveline device by using a lubricating composition. (end of abstract) Agent: The Lubrizol Corporation Attn: Docket Clerk, Patent Dept. - Wickliffe, OH, US Inventors: James N. Vinci, Michael E. Huston, Denise R. Vermilya, Charla A. Ramsey, Roger L. Sowerby USPTO Applicaton #: 20080103072 - Class: 508272 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20080103072. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF INVENTION [0001]The present invention relates to a lubricating composition containing a sulphur-free metal salt of a hydrocarbyl-substituted phosphorus compound and an organo-sulphide. The composition has a sulphur content of greater than 0.3 weight percent of sulphur. The invention further provides for a method of lubricating a driveline device by using a lubricating composition. BACKGROUND OF THE INVENTION [0002]Driveline power transmitting devices such as gears or transmissions, especially axle fluids and manual transmission fluids (MTFs), present highly challenging technological problems and solutions for satisfying the multiple and often conflicting lubricating requirements, whilst providing durability and cleanliness. One of the important parameters influencing durability is the effectiveness of phosphorus antiwear or extreme pressure additives at providing devices with appropriate protection under various conditions of load and speed. However, many of the phosphorus antiwear or extreme pressure additives contain sulphur. Due to increasing environmental concerns, the presence of sulphur in antiwear or extreme pressure additives is becoming less desirable. In addition, many of the sulphur-containing antiwear or extreme pressure additives evolve sulphur due to numerous volatile sulphur species being present, resulting in lubricating compositions containing antiwear or extreme pressure additives having an odour, may also be detrimental to health and the environment. [0003]A lubricating composition having the correct balance of phosphorus antiwear or extreme pressure additives provides driveline power transmitting devices with prolonged life and efficiency with controlled deposit formation and oxidation stability. However, many of the antiwear or extreme pressure additives employed have limited oxidative stability, form deposits or increase corrosion. In addition, many phosphorus antiwear or extreme pressure additives typically also contain sulphur, which results in a lubricating composition containing the phosphorus antiwear or extreme pressure additives are odorous. [0004]Consequently, it would be desirable to provide a balanced lubricant composition to meet the needs of driveline power transmitting devices without the disadvantages of known lubricating compositions. The present invention provides such a lubricating composition. [0005]U.S. Pat. No. 6,656,887 discloses lubricating oils containing at least one divalent metal salt of a thiophosphoric acid ester or a phosphoric acid ester and/or a monovalent metal salt or an ammonium salt of thiophosphoric acid or phosphoric acid. The lubricating composition has antiwear properties. The lubricating composition is especially useful for engine lubricants including those with a sulphur content of 0.3 wt % or less. [0006]US Patent Application 2005/0143266 discloses a lubricating composition containing (i) phosphoric acid esters and salts thereof, (ii) metal salts of phosphoric acid esters. Examples 4 and 5 disclose a combination of a zinc salt of phosphoric acid dimethyl ester and an octadecyl phosphoric acid dimethyl ester. The lubricating compositions are suitable for internal combustion engines. [0007]US Patent Application 2005/0130855 discloses a lubricating composition containing a neutral or overbased metal salicylate, 0.005 to 0.2 wt % in terms of phosphorus of a phosphorus-containing antiwear agent e.g., zinc di(n-butyl)phosphate. The lubricating composition further contains 0.3 wt % or less of sulphur. The lubricating composition is suitable for internal combustion engines. [0008]US Patent Application 2005/0107269 discloses a lubricating composition containing (i) phosphorus compounds of phosphoric or thiophosphoric esters, or amine or metal salts thereof, (ii) 0.005 to 0.5 wt % in terms of phosphorus of zinc dithiophosphates, (iii) metallic detergents, (iv) ashless dispersants and (v) antioxidants. The lubricating compositions are particularly useful for internal combustion engines. [0009]US Patent Application 2004/0242434 discloses a lubricating composition containing in specified ranges a triphosphate, a succinimide, a metal detergent, a phenol-based and/or amine-based antioxidant. [0010]EP287 618 discloses the preparation of an oil-soluble metal containing additive derived from reacting a metal hydroxide or metal oxide with a sulphur-free phosphorus acid ester. The oil-soluble metal containing additive is suitable for lubricants, fuels and functional fluids. [0011]U.S. Pat. No. 6,872,693 discloses a lubricating composition suitable for gear oils and transmission fluids that contains a mineral oil with an iodine number of less than 9. The lubricating compositions also contain a phosphorus antiwear agent. The phosphorus antiwear agent includes a phosphoric acid ester or salts thereof, a metal dithiophosphate, a phosphite, a reaction product of phosphorus acid or anhydride with an unsaturated compound. [0012]U.S. Pat. No. 6,730,640 discloses a lubricating composition containing an oil-soluble zinc salt containing at least one hydrocarbyl group of at least 4 carbon atoms, wherein the zinc salt is a zinc phosphate or at least one zinc salt of a carboxylic acid having 6 to 8 carbon atoms. The lubricating composition also contains a phosphorus compound of dialkyl hydrogen phosphite, alkyl hydrogen phosphonate or phosphoric acid. The oil-soluble zinc salt is suitable for continuously variable transmissions to increase steel-on-steel dynamic coefficients of friction of the lubricating composition. [0013]U.S. Pat. No. 4,431,552 discloses a lubricating composition containing a non-sulphur containing phosphate, a monothiophosphate, a dithiophosphate and an alkali-metal borate. Preferred non-sulphur containing phosphate compounds include dodecyl- or oleyl-dialkyl (C4-C8) phosphates. [0014]U.S. Pat. No. 5,726,132 discloses lubricating compositions with a phosphorus-containing sulphide that has a --P--S--(S)n-P-- group, where n is 0 to 3, a second phosphorus compound being either a phosphorus acid or esters, salt or derivatives thereof. The composition also contains an acyltated nitrogen-containing compound having a substitutent with at least 10 aliphatic carbon atoms. [0015]U.S. Pat. No. 4,575,431 discloses lubricating compositions containing a mixture of phosphates being essentially free of monothiophosphates and the phosphates are (a) dihydrocarbyl hydrogen thiophosphates, (b) sulphur-free hydrocarbyl dihydrogen phosphates and (c) sulphur-free dihydrocarbyl hydrogen phosphates. The sulphur-free hydrocarbyl dihydrogen phosphates and dihydrocarbyl hydrogen phosphates include C1-C6-alkyl dihydrogen phosphates and di-C1-C6-alkyl hydrogen phosphates. SUMMARY OF THE INVENTION [0016]In one embodiment the invention provides a lubricating composition comprising: [0017](a) an oil of lubricating viscosity; [0018](b) a phosphorus containing additive comprising: [0019](i) a sulphur-free metal salt of a hydrocarbyl-substituted phosphorus compound; and [0020](ii) optionally an ammonium or metal salt of a (thio)phosphoric acid ester different from (i); and [0021](c) an organo-sulphide, wherein the lubricating composition has a sulphur content in the range of greater than 0.3 wt %. [0022]In one embodiment the phosphorus containing additive comprises (i) a metal salt of a sulphur-free hydrocarbyl-substituted phosphorus compound; and (ii) an ammonium or metal salt of a phosphoric acid ester. [0023]In one embodiment the invention provides a method of lubricating a driveline device, the method comprising supplying to the driveline device a lubricating composition comprising: Continue reading... 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