Functional fluids having low brookfield viscosity using high viscosity-index base stocks, base oils and lubricant compositions, and methods for their production and use

a technology of low viscosity and functional fluids, applied in the field of low viscosity base stocks and base oils, can solve the problems of most complex and costly sub-assemblies, and achieve significant low-temperature performance benefits and improve the performance of finished functional fluids

Inactive Publication Date: 2008-02-07
ALEXANDER ALBERT GORDON +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0045] The highly advantageous low-temperature about −9° C. to −24° C. properties of these base stocks and base oils beneficially improve the performance of finished functional fluids at concentrations of 20 vol % or greater of the total base stocks and base oils contained in such compositions. Preferably, the inventive functional fluids incorporates these base stocks and base oils in combination with other individual base stocks and base oils to gain significant low-temperature performance benefits in finished lubricant compositions or functional fluids. Preferably, these other base stocks and base oils may be used at 50 vol % or more of the total base stocks and base oils contained in formulated functional fluids, without detracting from the elements of this invention. And in certain instances, the other base oil(s) may be most preferably used at 65 vol % or more of the total base stocks and base oils, or even 80 vol % or more of the total base stocks and base oils in finished lubricant compositions or functional fluids.

Problems solved by technology

They are the most complex and costly sub-assemblies of a vehicle and the major OEMs have stringent specifications to control all aspects of the components that go into their manufacture, including the functional fluid.

Method used

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  • Functional fluids having low brookfield viscosity using high viscosity-index base stocks, base oils and lubricant compositions, and methods for their production and use
  • Functional fluids having low brookfield viscosity using high viscosity-index base stocks, base oils and lubricant compositions, and methods for their production and use
  • Functional fluids having low brookfield viscosity using high viscosity-index base stocks, base oils and lubricant compositions, and methods for their production and use

Examples

Experimental program
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Effect test

example 1

[0186] By controlling other non-inventive process parameters well known to those skilled in the art, the base stocks incorporated into the functional fluids of this inventions as described herein can be made over a range of low to high viscosity oils as is typical in the industry thus allowing for blending of base stocks with a final viscosity between those two end points. In this first example, the base stocks were manufactured using the inventive method to a higher viscosity level of 6.6 cSt and a lower viscosity level of 4.0 cSt. As may be seen in table 3, the Inventive Oil A (isomerized slack wax) was then blended to two viscometric targets: 4.0 cSt and 5.7 cSt. Similarly, the Inventive Oil B for this example was made from a Fischer-Tropsch wax, blended to final viscosity targets of 4.0 cSt and 6.3 cSt. The Comparitive Base Oils for example 1 are commercially available base stocks blended to viscometric targets of 4 cSt, 5 cSt and 8 cSt.

[0187] Viscometric properties of Inventiv...

example 2

[0189] For example 2, five blended functional fluids were created. Blend 1, the comparative example, is a functional fluid made from a commercially available Group II base stock with the same target viscosity level as the inventive examples (see table 4). Blends 2 and 3 and Blends 6 and 7 are functional fluids incorporating Inventive Base Stock A from Example 1, specifically the 4 cSt viscosity target specification. Blends 4 and 5 are functional fluids incorporating Inventive Base Stock B from Example 1, specifically the 4 cSt viscosity target.

[0190] The properties of Comparative Blend 1 and Inventive Blends 2-7 at comparable viscosity indices are shown below in Table 4. The Kinematic Viscosities were measured by ASTM method D445. Brookfield viscosities were measured by ASTM method D2983. Pour point was measured by ASTM D5950. Blend 1 is the average results of Blends 1A and 1B seen in Table 5.

TABLE 4Blend 1Blend 2Blend 3Blend 4Blend 5Blend 6Blend 7Component, vol %Comparative base...

example 3

[0192] In an effort to recreate the results of the current invention which uses the catalytic dewaxing, by employing standard solvent dewaxing base oil extraction techniques, a third experiment was performed. The commercially available Group II base stock of Example 2 was subjected to 18 modifications commonly used to improve the low temperature properties of the base stock. These modifications were incorporated into functional fluids and the Brookfield Viscosity of each functional fluid was measured. The results are compared to the Brookfield viscosities of the Inventive functional fluids from Example 2 (Blends 2-5) in Table 5.

TABLE 5Base StockBlendPourATF Brookfield cPATF Brookfield cP#Point ° C.(Comparative Base Oils)(Inventive Base Oils)1A−2019,0261B−2019,5301-1−2018,8691-2−2315,9501-3−2117,2691-4−1824,3951-5−1526,8691-6−1922,3451-7−1426,6691-8−2019,2261-9−2316,2071-10−2118,9061-11−2216,0971-12−2023,3951-13−2417,2461-14−2617,8961-15−1917,5961-16−2017,4961-17−2017,9461-18−2315,...

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Abstract

The present invention relates to functional fluids, especially automatic transmission fluids showing surprising low temperature Brookfield viscosities and methods to produce them.

Description

[0001] This application is a Continuation-in-Part of U.S. Ser. No. 10 / 678,469 filed Oct. 3, 2003 and U.S. Provisional Application No. 60 / 432,489 filed Dec. 11, 2002.FIELD OF THE INVENTION [0002] This invention relates to base stocks and base oils that exhibit an unexpected combination of high viscosity index (130 or greater) and a ratio of measured-to-theoretical high-shear / low-temperature viscosity at −30C or lower and the methods of making them. Specifically, the present invention relates to low-viscosity base stocks and base oils as used in functional fluids. More specifically, the present invention relates to automatic transmission fluids showing surprising low temperature Brookfield viscosities and methods to produce them. BACKGROUND OF THE INVENTION [0003] API 1509 Appendix E defines base stocks (as opposed to base oils and lubricant compositions) as an hydrocarbon stream produced by a single manufacturer to the same specifications (independent of feed source or manufacturers ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M159/00C10G45/02C10G45/62C10G45/64C10M109/02C10M111/06C10M171/00C10M171/02
CPCC10G2400/10C10N2270/00C10M111/02C10M111/04C10M111/06C10M171/002C10M171/02C10M2203/1025C10M2205/163C10M2205/173C10N2220/022C10N2220/023C10N2220/025C10N2230/02C10N2230/08C10N2240/042C10M109/02C10N2020/011C10N2020/065C10N2020/02C10N2030/02C10N2030/08C10N2040/042C10N2070/00
Inventor ALEXANDER, ALBERT GORDONFYFE, KIM ELIZABETH
Owner ALEXANDER ALBERT GORDON
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