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  Blend comprising group iii and group iv basestocksUSPTO Application #: 20060211581Title: Blend comprising group iii and group iv basestocks Abstract: The invention relates to compositions comprising a blend of Group III basestocks and low volatility, low viscosity PAO basestocks. The blend is particularly useful for preparing finished lubricants that meet or even exceed the criteria for SAE Grade 0 W multi-grade engine oils. The combination of these low volatility, low viscosity PAOs with Group III basestocks provide, in embodiments, the necessary performance criteria in automatic transmission fluids, automotive or industrial gear oils, hydraulic fluids, or any other high performance lubricant requiring a combination of excellent low fluidity and low volatility. (end of abstract)
Agent: Exxonmobil Chemical Company Law Technology - Baytown, TX, US Inventors: Charles L. Bullock, Norman Yang, Kathleen K. Cooper, Nicole B. Temme USPTO Applicaton #: 20060211581 - Class: 508110000 (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.) The Patent Description & Claims data below is from USPTO Patent Application 20060211581. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of Provisional Application No. 60/662,608 filed Mar. 17, 2005, the disclosure of which is incorporated by reference. FIELD OF THE INVENTION [0002] The invention relates to compositions comprising a blend of Group III basestocks and low volatility, low viscosity PAO basestocks. The blend is particularly useful for preparing finished lubricants that meet or even exceed the criteria for SAE Grade 0 W multi-grade engine oils. BACKGROUND OF THE INVENTION [0003] Current technology requires either catalytically dewaxed, wax isomerate based Group III basestocks, or polyalphaolefins (PAOs) as the primary basestock to achieve certain requirements set by organizations such as ACEA (Association des Constructeurs d' Automobiles), ATIEL (Association Technique de L'Industrie Europeane des Lubrifiants), API (American Petroleum Institute), ILSAC (International Lubricant Standardization and Approval Committee), ASTM (American Society of Testing and Materials), EOLCS (Engine Oil Licensing and Certification System), SAE (Society of Automotive Engineers) for applications requiring excellent low temperature properties as well as high temperature stability. An example is SAE Grade 0 W multi-grade engine oils and ILSAC GF-4 specifications. There is currently a limited supply of both of these relatively expensive basestocks and development of alternatives is needed to meet growing demand. Technology to enable the use of more petroleum-derived basestocks in such formulations is highly sought-after. [0004] U.S. Pat. No. 5,693,598 describes a low viscosity oil having a kinematic viscosity of up to about 4 cSt at 100.degree. C. and a composition having antiwear properties and comprising said oil. The feed comprises from about 60 to about 90% C12. [0005] U.S. Pat. No. 5,789,355 relates to SAE Grade 5 W and higher multigrade oils including a basestock and a detergent inhibitor package. The basestock is selected from API Groups I and II. The detergent inhibitor package includes an ashless dispersant derived from an ethylene alphaolefin (EAO). [0006] U.S. Pat. No. 6,303,548 is directed to a base oil for an SAE Grade 0 W40 lubricant composition comprising a PAO and a synthetic ester lubricant. [0007] U.S. Pat. No. 6,824,671 describes a mixture of about 50 to 80 wt. % 1-decene and about 20 to 50 wt. % 1-dodecene are co-oligomerized in two continuous stirred-tank reactors in series using BF3 with an ethanol:ethyl acetate promoter. Monomers and dimers are taken overhead and the bottoms product is hydrogenated to saturate the trimers/oligomers to create a 5 cSt PAO. This product is further distilled and the distillation cuts blended to produce a 4 cSt PAO containing mostly trimers and tetramers, and a 6 cSt PAO containing trimers, tetramers, and pentamers. The lubricants thus obtained are characterized by a Noack volatility of about 4% to 12%, a pour point of about -40.degree. C. to -65.degree. C. See also copending U.S. application Ser. No. 10/959544. [0008] U.S. Patent Application 2004/0033908 describes a fully-formulated lubricant comprising PAOs, including a PAO prepared from an oligomerization process comprising contacting an alphaolefin feed with a BF.sub.3 catalyst and a promoter (or cocatalyst) system including an alcohol and an ester. [0009] U.S. Patent Application 2004/0129603; 2004/0154957; and 2004/0154958 describe formulations using catalytically dewaxed Group III materials. [0010] The present inventor has surprisingly discovered that an appreciable amount of conventional, hydrocracked Group III basestocks may be included in a blend further comprising a new type of PAO in order to meet increasingly stringent requirements for lubricants. SUMMARY OF THE INVENTION [0011] The invention is directed to compositions comprising a blend of (a) Group III basestocks, and (b) low volatility, low viscosity PAO basestocks characterized by a low kinematic viscosity, a low Noack volatility, and a low pour point. [0012] The invention is also related to a process for producing a blend comprising (a) at least one Group III basestock and (b) a PAO according to the invention. [0013] In preferred embodiments, the PAO according to the invention is characterized as obtainable by a process comprising contacting at least one alphaolefin with an oligomerization catalyst in the presence of a dual promoter system comprising at least one alcohol and at least one ester. [0014] In preferred embodiments, the PAO according to the invention is characterized as made by a process comprising contacting at least one alphaolefin with an oligomerization catalyst in the presence of a dual promoter system comprising at least one alcohol and at least one ester. [0015] In preferred embodiments, the PAO according to the invention is characterized as having a pour point less than -54.degree. C., and at least one of the following relationships: (i) a Noack volatility versus CCS relationship on or below curve A in FIG. 1; (ii) a Noack volatility versus CCS relationship on or below curve B in FIG. 1; (iii) a Noack volatility to KV relationship on or below the curve A in FIG. 2; (iv) a Noack volatility to KV relationship on or below the curve B in FIG. 2; (v) a Noack volatility to KV relationship on or below the curve A in FIG. 3; (vi) a Noack volatility to KV relationship on or below the curve B in FIG. 3. Preferably two or more, or three or more, or four or more, or five or more, or all six of these relationships hold. [0016] In preferred embodiments, the PAO according to the invention is characterized by a pour point less than -54.degree. C., and a Noack volatility to KV at 100.degree. C. relationship such that: (ia) within the range of 3.5 to 3.95 cSt at 100.degree. C. the Noack Volatility=(900)(KV).sup.-3.2; and (ib) within the range of greater than 3.95 to 6 cSt at 100.degree. C. the Noack Volatility=(175)(KV).sup.-2. [0017] In preferred embodiments, the Group III basestock used in the composition or blend according to the invention is not a Group III basestock obtained by a wax isomerization process. [0018] In preferred embodiments, the PAO characterizable by a low kinematic viscosity, low Noack volatility, and a low pour point is used without blending with other PAOs. [0019] It is an object of the invention to provide a convenient method of upgrading conventional petroleum-derived basestock, specifically Group III basestocks, into premium lubricant applications capable of meeting new requirements related to cold temperature performance and high temperature stability. [0020] It is further an object of the invention to provide an improved lubricant basestock blend, the improvement comprising an improved pour point as well as at least one of the properties defined by (i) through (vi) set forth above. Continue reading... Full patent description for Blend comprising group iii and group iv basestocks Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Blend comprising group iii and group iv basestocks 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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