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Transmission lubricating compositions with improved performance, containing acid/polyamine condensation product

a technology of lubricating compositions and condensation products, applied in the direction of lubricant compositions, organic chemistry, additives, etc., can solve the problems of difficult balance of competing requirements, achieve the effect of improving anti-shudder properties, reducing friction, and improving wear resistan

Inactive Publication Date: 2005-01-20
THE LUBRIZOL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention further provides compositions with improved wear resistance, improved anti-shudder properties, and the appropriate friction durability. The invention further provides compositions suitable for use in a variety of power transmissions, especially automatic transmission fluids.

Problems solved by technology

These competing requirements are difficult to balance.

Method used

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  • Transmission lubricating compositions with improved performance, containing acid/polyamine condensation product
  • Transmission lubricating compositions with improved performance, containing acid/polyamine condensation product
  • Transmission lubricating compositions with improved performance, containing acid/polyamine condensation product

Examples

Experimental program
Comparison scheme
Effect test

example 1

An oil of lubricating viscosity is prepared by blending 90 wt % of API Group III, Motiva Enterprise™ 70N oil, 3.04 mm2s−1 (cSt) at 100° C. with 10 wt % of API Group II, Neste™ 120N oil, 5.07 mm2s−1 (cSt) at 100° C. Added to the oil are (a) 0.33 wt % of the reaction product of boric acid and polyisobutylene succinimide; (b) 0.15 wt % based on the total composition of, the condensation product of a mixture of fatty acids with 16 to 18 carbon atoms with tetraethylene pentamine; (c) 0.2 wt % of a mixture of dialkyl C16 to C18 hydrogen phosphites; and (d) 0.2 wt % of the reaction product of boric acid with 1,2-epoxyhexadecane. To the resultant mixture, a number of other optional performance additives are added: (a) 2.25 wt % of non-borated dispersants, (b) 2.2 wt % of antioxidants, (c) 0.03 wt % of detergents, (d) 0.04 wt % of metal deactivators, (e) 0.3 wt % of seal swelling agents, (f) 55 ppm of antifoaming agents and (g) 3.1 wt % of diluent oil.

example 2

The experimental procedure is identical to the process of Example 1, except 0.16 wt % of the reaction product of boric acid and polyisobutylene succinimide is added.

example 3

The experimental procedure is identical to the process of Example 1, except that 8.8 wt % of a dispersant viscosity modifier, 0.02 wt % of a pour point depressant and 0.11 wt % of dibutyl hydrogen phosphite are added.

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Abstract

A lubricating composition containing (a) a hydrocarbyl phosphite; (b) the condensation product of at least one fatty acid with a polyamine; (c) a borate ester; (d) a borated dispersant; and (e) an oil of lubricating viscosity. The invention further relates to the use of the composition in automotive transmissions.

Description

FIELD OF INVENTION The present invention relates to an oil of lubricating viscosity containing the condensation product of a polyamine and an acid, a hydrocarbyl phosphite and boron containing compounds. The composition has improved wear properties. The composition can be used in automatic transmission fluids. BACKGROUND OF THE INVENTION It is known to add various additives to an oil of lubricating viscosity for automatic transmission fluids (hereinafter referred to as ATF) to improve resistance to wear, decrease anti-shudder properties and provide the appropriate friction properties. Friction properties of an ATF have to be balanced to provide high dynamic torque for efficient clutch engagement capacity and high static friction for good clutch holding. The ATF also has to provide a positive friction versus speed curve slope for good anti-shudder durability. These competing requirements are difficult to balance. In addition antiwear properties need to be sufficient for gear durabi...

Claims

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Application Information

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IPC IPC(8): C10M157/10
CPCC10M157/10C10M2215/08C10N2270/02C10N2260/04C10N2240/042C10M2215/224C10M2215/28C10M2215/30C10M2223/049C10M2227/061C10M2227/062C10N2230/06C10N2240/04C10N2030/06C10N2040/042C10N2040/04C10N2060/04C10N2070/02
Inventor SUMIEJSKI, JAMES L.SMOGGIE, JOHN C.TIPTON, CRAIG D.
Owner THE LUBRIZOL CORP
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