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Lubricant compositions

a technology of compositions and lubricants, applied in the field of lubricant compositions, can solve the problems of reducing effectiveness and often lacking shear stability of vi improvers, and achieve the effects of good metal-to-metal lubrication, increased viscosity index value of lubricant compositions, and acceptabl

Inactive Publication Date: 2015-08-20
DOW CORNING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text discusses the need for lubricant compositions with a high Viscosity Index (VI) and good metal-to-metal lubrication, while also being cost-effective. Currently, VI improvers are used to increase the viscosity index, but they often lack shear stability. This can reduce their effectiveness in lubricant situations. The technical effect of the patent is to provide lubricants with shear stable VI improvers that maintain or maximize the functional temperature range in which the fluid will lubricate.

Problems solved by technology

VI Improvers are currently typically high molecular weight organic polymers but their use does not always increase the Viscosity Index to the desired values for the purpose concerned and due to their high molecular weight said VI Improvers often lack shear stability.
However, VI Improvers are subject to shearing forces when present in lubricating situations and their stability as a result of these shearing forces (Shear Stability) may reduce their effectiveness.

Method used

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  • Lubricant compositions
  • Lubricant compositions
  • Lubricant compositions

Examples

Experimental program
Comparison scheme
Effect test

example 1a

PDES+PAO

[0136]

PDESPAOLCC(wt %) (B)(wt %) (A)(N)010045059520001090200040602000604015008020750901012001000250

[0137]Example 1a shows that mixtures according to the invention containing PDES have an LCC much higher than the pure oils in the range of between 0.5 and 50% wt of component (B), namely the PDES. The effect can be already seen with a 5% wt % addition level of PDES into the PAO.

example 1b

PDES+PAO

[0138]

Viscosity atViscosity atPDESPAO40° C.100° C.Viscosity(Wt %) (B)(Wt %) (A)(mPa · s)(mPa · s)Index0100—— 143*208030.916.62207406038.278.3222604050.7612.5271802082.3419.332679010118.9328.08285

[0139]Example 1b shows that mixtures according to the invention containing PDES (i.e. component B) have much higher Viscosity Index values (at least 10% greater) than 100% PAO (*: Viscosity Index 143 from suppliers datasheet).

example 2a

PDES+Mineral Oil

[0140]

PDESMineral OilLCC(Wt %) (B)(Wt %) (A)(N)0100100059514001090200020801800406010506040110080204509554501000250

[0141]Example 2 a shows that compositions as hereinbefore described containing PDES and mineral oil have an LCC much higher than 100% mineral oil. The effect can be seen at 5% addition level of PDES into the mineral oil.

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Abstract

A lubricant composition comprises: (A) a non-silicone base stock oil; and (B) a silicone oil. The Viscosity Index of the lubricant composition, as measured in accordance with ASTM D 2270-10e1, is greater than that of the non-silicone lubricant base stock oil (A) by at least 10% and is shear stable according to DIN 51350-6.

Description

[0001]This application claims priority to and all the advantages of U.S. Provisional Patent Application No. 61 / 628,871, filed on Aug. 14, 2013, the content of which is incorporated herein by reference.TECHNICAL FIELD[0002]Disclosed herein are lubricant compositions comprising a non silicone lubricant base stock and a silicone oil.BACKGROUND[0003]Lubricant oils and compositions are used to reduce friction and wear between moving elements or surfaces. The main component of lubricant oils and compositions is commonly referred to as a base stock. Base stocks are classified by the American Petroleum Institute in five Groups, namely Groups I, II, III, IV and V. Lubricant base stocks include natural lubricating oils, synthetic lubricating oils, and mixtures thereof. Groups I to III include base stocks derived from petroleum based oils, while Groups IV and V include synthetic base stocks including silicones.[0004]The viscosity of a lubricant changes with temperature. As temperature rises vi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M169/04
CPCC10M169/042C10M111/04C10M2203/1006C10M2203/1025C10M2205/006C10M2205/02C10M2205/026C10M2205/0285C10M2207/2835C10M2209/1033C10M2209/105C10M2229/041C10M2229/0415C10M2229/042C10M2229/0425C10M2229/0505C10M2229/052C10M2229/0525C10M2205/028C10N2020/019C10N2020/02C10N2030/02C10N2030/68C10N2040/044C10N2040/042C10N2030/06C10N2040/04C10N2040/046C10N2040/08C10N2050/01C10N2050/10C10M2209/108
Inventor FISHER, MARKJUNGK, MANFREDSTAMMER, ANDREASSTOEGBAUER, HERBERT
Owner DOW CORNING CORP
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