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  Gear additive compositionUSPTO Application #: 20070105729Title: Gear additive composition Abstract: There is disclosed herein a gear additive composition including a nitrogen-containing compound and a phosphorus-containing compound, wherein the ratio of total base number to total acid number of the gear additive composition is greater than about 0.94. There is also disclosed a gear lubricant composition having the disclosed gear additive and a reaction product of a sulfur-containing compound, a phosphorous-containing compound, and a nitrogen-containing compound. Methods of using both compositions are also disclosed. (end of abstract)
Agent: New Market Services Corporation (formerly Ethyl Corporation) - Richmond, VA, US Inventors: Chip Hewette, Roger M. Sheets, David J. DeGonia USPTO Applicaton #: 20070105729 - Class: 508422000 (USPTO) Related Patent Categories: Solid Anti-friction Devices, Materials Therefor, Lubricant Or Separant Compositions For Moving Solid Surfaces, And Miscellaneous Mineral Oil Compositions, Lubricants Or Separants For Moving Solid Surfaces And Miscellaneous Mineral Oil Compositions (e.g., Water Containing, Etc.), Organic Phosphorus Compound, Wherein The Phosphorus Is Single Bonded Directly To Chalcogen By Nonionic Bonding (e.g., Phosphorus Acids, Esters, Etc.), The Phosphorus Is In A Ring The Patent Description & Claims data below is from USPTO Patent Application 20070105729. Brief Patent Description - Full Patent Description - Patent Application Claims
RELATED APPLICATIONS [0001] This application claims the benefit of priority of U.S. Provisional Application No. 60/734,757, filed on Nov. 9, 2005. FIELD OF THE DISCLOSURE [0002] The present disclosure relates to a gear additive composition comprising a nitrogen-containing compound, and a phosphorus-containing compound wherein the ratio of the total base number to total acid number of the gear additive composition is greater than about 0.94. Moreover, there is disclosed a gear lubricant composition comprising a sulfur-containing, phosphorus-containing compound and/or its salt, and the gear additive composition. Further, the present disclosure relates to methods of use of the gear additive and the gear lubricant compositions. BACKGROUND OF THE DISCLOSURE [0003] The use of phosphorous-containing compounds in lubricant compositions is known. In particular, the phosphorous-containing compounds generally comprise linear alkyl chains. However, the problem with these compounds is that they are known to be thermally unstable at elevated temperatures in a fully formulated gear lubricant. A thermally unstable compound is more likely to prematurely decompose in the lubricant composition and would no longer provide a property, such as antiwear, to the lubricant composition. [0004] Lubricant compositions, such as gear oils, typically are subjected to elevated temperatures and therefore it would be beneficial to provide a thermally stable compound that would not prematurely decompose at higher temperatures. A thermally stable compound would therefore remain in the lubricant composition for an extended period of time and provide the property, e.g., antiwear, to the composition over the extended period of time. What is needed is a compound that has the proper thermal stability to sustain its antiwear property. [0005] Some compounds that can provide improved antiwear to a lubricant composition may not be suitable for use in a limited slip differential because it would result in an audible noise, for example a moan. Clearly, one way to reduce the moan would be to remove the compound that creates the moan. The problem is that the lubricant composition could then also lose the benefit of the antiwear property. What is needed is a composition, such as a top treat, that would reduce and/or eliminate the moan while still allowing for the presence of the antiwear compound in the lubricant formulation. [0006] New and advanced differential gear and transmission systems are being developed by the automotive industry. These new systems often involve high energy requirements. Therefore, component protection technology must be developed to meet the increasing energy requirements of these advanced systems. [0007] An example of a gear apparatus is the limited slip differential. Limited slip differentials are provided in many vehicles to counteract a commonly occurring situation where one of the two driving tires or wheels is essentially void of traction. This may be in loose soil, sand, mud, or ice. In the standard open differential, the driving tire void of traction receives all of the powertrain torque, but spins without moving the vehicle in the desired direction. In a limited slip differential, a mechanism divides, or shares, a portion of the torque delivered by the powertrain with both driving wheels. By sharing the available torque, a wheel with some traction receives enough torque to move the vehicle in the desired direction. In addition, high performance vehicles have so much torque that in certain turning situations the torque on one wheel exceeds the available traction and, thus, performance suffers. The limited slip differential shares the torque between both wheels, enhancing the performance of the vehicle. [0008] Limited slip differentials require that the lubricant for the rear axle have proper friction characteristics, and that the friction characteristics last for a sufficient elapsed mileage or duration. The proper friction characteristic is that the friction coefficient rises with increasing plate rotational speed, and falls with decreasing plate rotational speed. [0009] To provide the proper friction characteristics and lifetime, certain additives may be added as a top treat to the gear lubricant. These additives can be selected from a wide range of friction modifiers and related compounds. SUMMARY OF THE DISCLOSURE [0010] In accordance with the disclosure, a gear additive composition may comprise a nitrogen-containing compound and a phosphorus-containing compound wherein the ratio of total base number to total acid number of the gear additive composition is greater than about 0.94. [0011] In another aspect, there is disclosed a gear lubricant composition comprising a gear additive composition comprising a nitrogen-containing compound and a phosphorus-containing compound, wherein the ratio of total base number to total acid number of the gear additive composition is greater than about 0.94; and a reaction product of a sulfur-containing compound, a phosphorus-containing compound, and a nitrogen-containing compound. [0012] In a further aspect, there is disclosed a lubricant composition comprising a base oil; a gear additive composition comprising a nitrogen-containing compound and a phosphorus-containing compound, wherein the ratio of total base number to total acid number is greater than about 0.94; and a reaction product of a nitrogen-containing compound, a neopentyl glycol phosphite, and a sulfur-containing compound. [0013] In yet another aspect, there is disclosed a method of manufacturing a gear lubricant composition comprising blending a base oil; a gear additive composition comprising a nitrogen-containing compound and a phosphorus-containing compound, wherein the ratio of total base number to total acid number of the gear additive composition is greater than about 0.94; and a reaction product of a sulfur-containing compound, a phosphorus-containing compound, and a nitrogen-containing compound. [0014] Additional objects and advantages of the disclosure will be set forth in part in the description which follows, and/or can be learned by practice of the disclosure. The objects and advantages of the disclosure will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims. [0015] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure, as claimed. DESCRIPTION OF THE EMBODIMENTS [0016] As used herein, the term "hydrocarbyl substituent" or "hydrocarbyl group" is used in its ordinary sense, which is well-known to those skilled in the art. Specifically, it refers to a group having a carbon atom directly attached to the remainder of the molecule and having predominantly hydrocarbon character. Examples of hydrocarbyl groups include: [0017] (1) hydrocarbon substituents, that is, aliphatic (e.g., alkyl or alkenyl), alicyclic (e.g., cycloalkyl, cycloalkenyl) substituents, and aromatic-, aliphatic-, and alicyclic-substituted aromatic substituents, as well as cyclic substituents wherein the ring is completed through another portion of the molecule (e.g., two substituents together form an alicyclic radical); [0018] (2) substituted hydrocarbon substituents, that is, substituents containing non-hydrocarbon groups which, in the context of this invention, do not alter the predominantly hydrocarbon substituent (e.g., halo (especially chloro and fluoro), hydroxy, alkoxy, mercapto, alkylmercapto, nitro, nitroso, and sulfoxy); [0019] (3) hetero substituents, that is, substituents which, while having a predominantly hydrocarbon character, in the context of this invention, contain other than carbon in a ring or chain otherwise composed of carbon atoms. Heteroatoms include sulfur, oxygen, nitrogen, and encompass substituents as pyridyl, furyl, thienyl and imidazolyl. In general, no more than two, for example no more than one, non-hydrocarbon substituent will be present for every ten carbon atoms in the hydrocarbyl group; typically, there will be no non-hydrocarbon substituents in the hydrocarbyl group. Continue reading... Full patent description for Gear additive composition Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Gear additive composition patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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