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Lubricating Composition Containing Viscosity Modifier Combination

a technology of viscosity modifiers and lubricating compositions, applied in the direction of lubricant compositions, fuels, thickeners, etc., can solve the problems of poor non-dispersant cleanliness, poor shear stability of viscosity index improvers, poor fuel economy, etc., to improve mechanical device durability, improve oxidative stability, and reduce mechanical device operating temperature

Inactive Publication Date: 2016-05-26
THE LUBRIZOL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The inventors of this invention have discovered that a lubricating composition, method and use as disclosed herein is capable of providing at least one of improved oxidative stability, reduced mechanical device operating temperatures, increased mechanical device durability, improved shear stability index, improved viscosity index, improved low temperature viscometrics and improved high temperature viscometrics.
[0028]In one embodiment the invention provides for the use of a lubricating composition as described herein to provide a lubricant (typically a manual transmission lubricant) with at least one (or at least two, or up to all) of acceptable or improved shear stability, acceptable or improved viscosity index control, acceptable or improved low temperature viscosity, acceptable or improved fuel economy, and acceptable or improved device operating temperatures. Typically the lubricant may be used in a driveline device such as a manual transmission.

Problems solved by technology

However, such viscosity index improvers have poor shear stability, too high a viscosity at low temperature, poor fuel economy, and poor non-dispersant cleanliness.
Conversely, higher viscosity fluids contribute to elevated gear and transmission operating temperatures, which are believed to reduce fuel economy and diminish durability.

Method used

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  • Lubricating Composition Containing Viscosity Modifier Combination
  • Lubricating Composition Containing Viscosity Modifier Combination

Examples

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examples

[0177]Star Polymers 1 to 13 (SP1 to SP13): Polymers are the same as those disclosed on page 32, paragraph [0100] of International Publication WO 2006 / 047393 (equivalent to US Publication 2009-0118150) respectively, except monomer B (as is shown in Table 9 of WO 2006 / 047393) is methyl methacrylate.

[0178]Substantially linear polymers 1 to 8 (SLP1 to SLP8) with a weight average molecular weight of 45,000 or less are disclosed in International Application PCT / US09 / 052028 (filed 29 Jul., 2009 by Barton et al., now WO2010 / 014655) respectively; see examples Cpp1 to Cpp8 in paragraphs [0140] and [0141].

[0179]Comparative Example 1 (CE1) is a manual transmission lubricant based on an API Group III base oil further containing 0.45 wt % of one or more corrosion inhibitors, 0.75 wt % of one or more antioxidants, 0.68 wt % of one or more antiwear agents, 0.62 wt % of one or more detergents, 1.5 wt % of one or more dispersants, 1 wt % of one or more pour point depressant, 0.02 wt % of one or more ...

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Abstract

The present invention relates to a lubricating composition containing (a) an oil of lubricating viscosity, (b) a star polymer and (c) a substantially linear polymer with a weight average molecular weight of 45,000 or less. The invention further provides a method of lubricating a mechanical device, typically a manual transmission with the lubricating composition. The invention further provides for the use of the lubricating composition to provide a number of benefits including lower operating temperatures and fuel economy.

Description

FIELD OF INVENTION[0001]The present invention relates to a lubricating composition containing (a) an oil of lubricating viscosity, (b) a star polymer and (c) a substantially linear polymer with a weight average molecular weight of 45,000 or less. The invention further provides a method of lubricating a mechanical device, typically a manual transmission with the lubricating composition. The invention further provides for the use of the lubricating composition to provide a number of benefits including lower operating temperatures and fuel economy.BACKGROUND OF THE INVENTION[0002]Viscosity index improvers are known to be added to lubricating oil compositions to improve the viscosity index of the lubricant. Typical viscosity index improvers include polymers of methacrylates, acrylates, olefins (such as copolymers of alpha-olefins and maleic anhydride and esterified derivatives thereof), or maleic anhydride-styrene copolymers, and esterified derivatives thereof. The viscosity index impro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M119/12C10M119/24
CPCC10M119/24C10M119/12C10M169/041C10M169/042C10M2209/084C10M2205/028C10N2020/04C10N2020/073C10N2030/06C10N2030/02C10N2030/68C10M145/14C10M159/005C10M2203/1006C10N2040/042C10N2040/04C10M145/10C10M169/04
Inventor GELDER, ANDREWPRICE, DAVIDBROWN, GARETHEVANS, SIMON D.
Owner THE LUBRIZOL CORP
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