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  Compositions and methods for improved friction durability in power transmission fluidsUSPTO Application #: 20080090744Title: Compositions and methods for improved friction durability in power transmission fluids Abstract: The present invention discloses friction modifier compositions, methods for incorporating an alkoxylated alcohol component in power transmission fluids, and methods for measuring friction performance. These formulations and methods provide improved overall friction and improved friction durability, yielding effective fluids that are stable with age. Benefits in friction modification may also be achieved when the alkoxylated alcohol component is heated with an ashless dispersant prior to its incorporation into a transmission fluid. (end of abstract) Agent: Mr. Dennis H. Rainear Law Department - Richmond, VA, US Inventors: Lee D. SAATHOFF, Samuel H. TERSIGNI, Kenji YATSUNAMI USPTO Applicaton #: 20080090744 - Class: 508579000 (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 Oxygen Compound, Ethers The Patent Description & Claims data below is from USPTO Patent Application 20080090744. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD [0001] The present invention relates to transmission fluid compositions and methods for incorporating an alkoxylated alcohol component in power transmission fluids that provide high overall friction and improved friction durability, yielding effective transmission fluids that are stable with age and operating stresses. The present invention also relates to methods for measuring friction performance of a power transmission fluid. BACKGROUND [0002] Power transmission fluids must serve many functions, including the capability to provide sufficient coefficients of friction for friction plates, and in the case of a continuously variable transmission (CVT), the proper steel-on-steel coefficient of friction. [0003] Considerable effort has been devoted to the provision of oil-soluble additive formulations for use in power transmission fluids, and in particular those for automatic transmissions and CVTs. Friction modifiers have frequently been used in such formulations to modify the shape of the "friction vs. sliding speed" curve (the .mu.-v curve), in general, to make it more positive. One disadvantage of many friction modifiers is that they typically deteriorate with thermal and chemical stresses. This can lead to shudder in slipping torque converters, in lock-up torque converters, in shifting clutches, in clutch-to-clutch transmissions, and in transmissions with wet starting clutches. It can also lead to instability in measures of dynamic friction in three-, four-, five-, six-, or seven-speed transmissions, and in CVTs (chain, belt, or toroidal disk type). There is a need for a highly stable friction modifier as an additive in a power transmission fluid that would extend its useful life. BRIEF DESCRIPTION OF EMBODIMENTS [0004] The present invention discloses the novel use of an alkoxylated alcohol, both as an independent additive or in conjunction with one or more other additives, as a friction modifier that resists deterioration and achieves improved friction and friction durability. Further, the power transmission fluids of the present disclosure provide improved or lower static friction while maintaining dynamic friction, thus controlling (or decreasing) friction in a stable manner. [0005] In an embodiment, a power transmission fluid having improved friction properties may comprise a major amount of a base oil and a minor amount of at least one alkoxylated alcohol. [0006] In another embodiment, a power transmission may comprise a dispersant and an alkoxylated alcohol having at least 8 carbon atoms. [0007] In another embodiment, a method of making a power transmission fluid having friction modifying capabilities may comprise adding to a major amount of a base oil a minor amount of at least one alkoxylated alcohol. [0008] In another embodiment, a method of making a power transmission fluid concentrate having improved friction modifying properties may comprise combining at least one alkoxylated alcohol and a dispersant and heating the alkoxylated alcohol and the dispersant at a temperature between about 25.degree. C. and about 200.degree. C. for a time between about 0.1 to about 196 hours. [0009] In another embodiment, a method of making a power transmission fluid may comprise combining an alkoxylated alcohol with a dispersant and forming a mixture, heating the mixture, and adding the mixture to a base oil. [0010] In another embodiment, a method of making a power transmission fluid may comprise combining an alkoxylated alcohol with a dispersant and forming a mixture, and adding the mixture to a base oil. [0011] In another embodiment, a method of measuring friction performance of a power transmission fluid using an LFW-1 apparatus may comprise the steps of: applying a first power transmission fluid between a block and ring of an LFW-1 test apparatus; rotating the ring relative to the block from a velocity of about 0 m/s to about 0.5 m/s in about 40 seconds at a constant rate of acceleration and then rotating the ring relative to the block from a velocity of about 0.5 m/s to about 0 m/s at a constant rate of deceleration to provide a cycle; and measuring friction between the block and ring during the cycle. [0012] In another embodiment, a method of selecting a power transmission fluid may comprise the method of measuring friction performance described herein, further comprising selecting a power transmission fluid by comparing the friction durability of the first power transmission fluid and the second power transmission fluid. BRIEF DESCRIPTION OF THE DRAWINGS [0013] FIG. 1(A) illustrates friction profiles for samples tested in a LFW-1 test according to some embodiments of the present disclosure. [0014] FIG. 1(B) illustrates friction profiles for samples tested in a LFW-1 test according to some embodiments of the present disclosure. [0015] FIG. 2 illustrates friction profiles for samples tested in a LFW-1 test according to some embodiments of the present disclosure. [0016] FIG. 3 illustrates friction profiles for samples tested in a LFW-1 test according to some embodiments of the present disclosure. DETAILED DESCRIPTION OF EMBODIMENTS [0017] Novel compositions for enhancing friction and friction durability in power transmission fluids, and also methods for making and using these compositions are presented herein. The power transmission fluids of the present disclosure may comprise a major amount of base oil and a minor amount of an alkoxylated alcohol or mixture of alkoxylated alcohols. The present compositions achieve improved performance and friction durability in power transmission fluids through the incorporation of an alkoxylated alcohol component, which enhances the life of a transmission fluid that is subjected to oxidative and thermal degradation conditions during normal service. [0018] The present embodiments overcome previous difficulties in achieving enhanced friction performance and overall utility of a power transmission fluid over long periods of time. [0019] The alkoxylated alcohol friction modifiers useful in certain embodiments of the present disclosure are represented by the general formula: R--[O--(CH.sub.2).sub.X].sub.Y--OH wherein R may be a linear, branched, or cyclic aliphatic hydrocarbon group having from about 1 to about 50 carbon atoms, X may range from about 1 to about 10, and Y may range from about 1 to about 10. In an embodiment, R may be a hydrocarbon group having from about 3 to about 40 carbon atoms, or as a further embodiment, from about 8 to about 18 carbon atoms. In an embodiment, X may range from about 2 to about 4, and Y may range from about 1 to about 6. Continue reading... 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