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  Base oil blends having unexpectedly low brookfield dynamic viscosity and lubricant compositions therefromUSPTO Application #: 20070197408Title: Base oil blends having unexpectedly low brookfield dynamic viscosity and lubricant compositions therefrom Abstract: A base oil having an unexpectedly low dynamic viscosity as measured by ASTM D5133 test method comprises a blend of about 65 to 97.5 wt % of a paraffinic oil having a VI of 130 or greater, a Kv@100° C. of about 3.8 cSt or greater and a pour point of −15° C. or less and an ester of lubricating viscosity of from about 35 to about 2.5 wt %. The base oil is further characterized as free of added viscosity modifiers. (end of abstract) Agent: Exxonmobil Research And Engineering Company - Annandale, NJ, US Inventor: David G. L. Holt USPTO Applicaton #: 20070197408 - Class: 508463000 (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 -c(=o)o- Compound, Specified Compound Wherein The Single Bonded Oxygen Is Bonded Oxygen Is Bonded Directly To An Additional Carbon, Which Carbon May Be Single Bonded To Any Atom But May Be Multiple Bonded Only To Carbon (i.e., Specified Carboxylic Acid Ester) The Patent Description & Claims data below is from USPTO Patent Application 20070197408. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims the benefit of U.S. Provisional Application No. 60/774,366 filed Feb. 17, 2006. Field of Invention [0002] This invention relates to base oil blends for functional fluids, especially hydraulic fluids, that have an unexpectedly low dynamic viscosity. This invention also relates to lubricant composition or functional fluids comprising these base oil blends. BACKGROUND OF THE INVENTION [0003] Hydraulic equipment owners require their equipment to operate effectively over a wide temperature range. For example, cargo handling systems aboard cargo ships must be able to operate regardless of the prevailing climate, which can range from tropical to artic conditions. Consequently, hydraulic oils have been developed which have good low-temperature flow properties for service under severe cold climatic conditions and which provide good performance under hot climatic conditions. [0004] In order to achieve the desired wide temperature working ranges, hydraulic fluids are commonly formulated in two ways. The first way involves using mixtures of solvent-refined paraffinic base oils and solvent refined naphthenic base oils with added viscosity modifier and pour point depressant. The second way involves using a poly alpha olefin base oil (PAO, Group IV base stock). [0005] The first method requires a more complex formulation approach but is generally preferred because it is more cost effective than the second way, which requires an expensive special PAO base stock. However, the viscosity index modifiers employed in the first technique are subject to shear in service, thus causing a degradation in performance. [0006] A base stock (as opposed to a base oil and a functional fluid) is defined as a hydrocarbon stream produced by a single manufacturer to the same specification (independent of feed source) and that is characterized by a unique formula, product identification number, or both. Base stocks may be manufactured using a variety of different processes including, but not limited to, distillation, solvent refining, hydrogen processing, oligomerization, esterification and rerefining. Rerefining stock shall be substantially free from materials introduced through manufacturing, contamination or previous uses. A base oil is the base stock or blend of base stocks used in formulated lubricant or functional fluid compositions. A lubricant composition may be a base stock, a base oil, either alone or mixed with other stocks, oils or functional additives. [0007] An object of the present invention is to provide functional fluids, and especially hydraulic fluids, that exhibit good low temperature performance in the absence of an added viscosity modifier. [0008] Another object of the present invention is to provide functional fluids, and especially hydraulic fluids, that employ a base oil other than a PAO. [0009] These and other objects will become apparent from the description which follows. SUMMARY OF THE INVENTION [0010] Broadly stated, the present invention encompasses base stocks, base oils and functional fluid compositions that have the surprising and unexpected combustion of properties of a high viscosity index (VI) and good low temperature performance in the absence of an added viscosity index modifier. [0011] In a preferred embodiment base stocks and base oils are provided comprising: [0012] (a) from about 65 to about 97.5 wt %, based on the base stock or base oil, of an oil having a VI of 130 or greater, a Kv at 100.degree. C. of 3.8 cSt or greater and a pour point of -15.degree. C. or lower; and [0013] (b) from about 2.5 to about 35 wt %, based on the base stock or base oil, of an ester of lubricating viscosity. BRIEF DESCRIPTION OF THE INVENTION [0014] FIGS. 1 to 3 are graphs showing the improved dynamic viscosity of lubricant compositions of the invention as compared to compositions based on polyalpha olefins when measured by ASTM D5133. DETAILED DESCRIPTION OF THE INVENTION [0015] The base stocks or base oils of the present invention have both a high viscosity index and exhibit good low temperature performance as evidenced by their dynamic viscosity as measured by ASTM D5133. Indeed, the base stocks and base oils of the invention do not require added viscosity modifiers to achieve their low temperature performance properties. [0016] These base stocks and base oils are a blend of a paraffinic oil having a VI of about 130 or greater a Kv at 100.degree. C. of about 3.8 cSt or greater and a pour point of about -15.degree. C. or lower, and an ester of lubricating viscosity. [0017] Preferably, the paraffinic oil will have a VI of from about 130 to about 160 and more preferably from about 140 to 150; a Kv at 100.degree. C. of from about 3 cSt to about 10 cSt and more preferably about 3.8 cSt to about 6.8 cSt; and a pour point (ASTM D97) of from about 0.degree. C. to about -30.degree. C. and more preferably from about -15.degree. C. to about -25.degree. C. Process: [0018] The paraffinic oils recited herein are made from waxy feedstocks to meet the requirement of a Group III base stock while at the same time having excellent properties such as high VI and low temperature performance. [0019] The waxy feedstock used in these processes may derive from natural or mineral or synthetic sources. The feed to this process may have a waxy paraffins content of at least 50% by weight, preferably at least 70% by weight, and more preferably at least 80% by weight. Preferred synthetic waxy feedstocks generally have waxy paraffins content by weight of at least 90 wt %, often at least 95 wt %, and in some instances at least 97 wt %. In addition, the waxy feed stock used in these processes to make the base stocks and base oils recited herein may comprise one or more individual natural, mineral, or synthetic waxy feedstocks, or any mixture thereof. [0020] In addition, feedstocks to these processes may be either taken from conventional mineral oils, or synthetic processes. For example, synthetic processes may include GTL (gas-to-liquids) or processes such as the Kolbel-Englehardt process and the FT (Fischer-Tropsch) process in which waxy hydrocarbons are catalytically produced from CO and hydrogen. Many of the preferred feedstocks are characterized as having predominantly saturated (paraffinic) compositions. Continue reading... Full patent description for Base oil blends having unexpectedly low brookfield dynamic viscosity and lubricant compositions therefrom Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Base oil blends having unexpectedly low brookfield dynamic viscosity and lubricant compositions therefrom 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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