Lubricating Composition Containing Viscosity Modifier Combination

Inactive Publication Date: 2012-12-27
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

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.
Conv

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example

[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 antifoam agent and 20 wt % of the copolymer of SLP1.

Example

[0180]Comparative Example 2 (CE2) is manual transmission lubricant similar to CE1, except it contains 16 wt % of the polymer of SP11.

[0181]Invention lubricant 1 (INVL1) is a manual transmission lubricant similar to CE1, except the copolymer of SLP1 is present at 11 wt % and the polymer of SP13 is present at 10 wt %.

[0182]The manual transmission lubricants are evaluated using the following test procedures: ASTM D445 (Kinematic Viscosity (KV) at 40° C. and 100° C., ASTM D2983 (Brookfield Viscosity (BV) are determined at −40° C.), D2270 (Viscosity Index (VI)), KRL tapered bearing shear stability test (KRL Test), and an Energy Loss test

[0183]The lubricating compositions are subjected to shear as determined by KRL tapered bearing shear stability test employing a 4-ball wear test instrument as is used in CEC DIN 51350 Part 6 test procedure. The instrument is run for 20 hours with a 5000 N load, at 140° C. and at 1450 rpm. The viscosity data obtained from the test is described in ASTM meth...

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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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IPC IPC(8): C10M145/14C10M145/16
CPCC10M145/14C10M159/005C10M2203/1006C10M2205/028C10M2209/084C10N2220/021C10N2220/029C10N2240/042C10N2230/02C10N2230/06C10N2230/68C10N2240/04C10M169/041C10M169/042C10N2020/04C10N2020/073C10N2030/06C10N2030/02C10N2030/68C10N2040/042C10N2040/04C10M145/10C10M169/04C10M119/12C10M119/24
Inventor GELDER, ANDREWPRICE, DAVIDBROWN, GARETHEVANS, SIMON
Owner THE LUBRIZOL CORP
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