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Lubricating oil compositions comprising a molybdenum compound and a zinc dialkyldithiophosphate

Inactive Publication Date: 2009-06-25
BOFFA ALEXANDER B +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]Provided herein are lubricating oil compositions that provide an

Problems solved by technology

Other additives, while improving one characteristic of the lubricating oil, have an adverse effect on other characteristics.
To provide antiwear effects, molybdenum compounds are generally added in amounts introducing from about 350 ppm up to 2,000 ppm of molybdenum into the oil. molybdenum compounds are effective antiwear agents and may further provide fuel economy benefits, such molybdenum compounds are expensive relative to more conventional, metal-free (ashless) organic friction modifier

Method used

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  • Lubricating oil compositions comprising a molybdenum compound and a zinc dialkyldithiophosphate
  • Lubricating oil compositions comprising a molybdenum compound and a zinc dialkyldithiophosphate
  • Lubricating oil compositions comprising a molybdenum compound and a zinc dialkyldithiophosphate

Examples

Experimental program
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Effect test

example 1

[0131]A lubricating oil composition was prepared and used for assessing boundary lubrication properties in the High Frequency Reciprocating Rig (HFRR) test (ASTM D 6079). The composition contained a major amount of a base oil of lubricating viscosity and the following additives, to provide an SAE 5W-20 finished oil;

[0132](1) 700 ppm in terms of molybdenum content, of a molybdenum dithiocarbamate

[0133](2) 1 wt % of a borated bis-succinimide dispersant

[0134](3) 4 wt % of an ethylene carbonate post-treated bis-succinimide

[0135](4) 164 ppm in terms of calcium content, of a 17 TBN calcium sulfonate detergent

[0136](5) 2220 ppm in terms of calcium content, of a 148 TBN calcium salicylate

[0137](6) 1 wt % of an alkylated diphenylamine

[0138](7) 0.2 wt % of hindered phenol

[0139](8) 0.2 wt % of a pour point depressant

[0140](9) 4.8 wt % of a non-dispersant ethylene-propylene copolymer concentrate

[0141](10) 5 ppm in terms of Silicon content, of a foam inhibitor

[0142](11) The remainder was diluent...

example 2

[0143]A lubricating oil was prepared in accordance with the formulation of Example 1 except that 250 ppm in terms of phosphorus content of a zinc dialkyldithiophosphate was added. The composition contained 250 ppm phosphorus based on the total weight of the lubricating oil composition.

[0144]The zinc dialkyldithiophosphate is synthesized using a mixture of C4 and C6 secondary alcohols. The resulting zinc dialkyldithiophosphate is a zinc bis(O,O′-di-(2-butyl / 4-methyl-2-pentyl)dithiophosphate.

example 3

[0145]A lubricating oil was prepared in accordance with the formulation of Example 1 except that 500 ppm in terms of phosphorus content of the zinc dialkyldithiophosphate was added. The composition contained 500 ppm phosphorus based on the total weight of the lubricating oil composition.

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Abstract

Provided herein are lubricating oil compositions comprising a major amount of a base oil, at least one oil-soluble molybdenum compound and a zinc dialkyldithiophosphate compound, wherein the molybdenum content derived from the molybdenum compound is at least 10 ppm based on the total weight of the lubricating oil composition and the phosphorus content derived from the zinc dialkyldithiophosphate compound is about 200 to 500 ppm based on the total weight of the lubricating oil composition. The lubricating oil composition can further comprise at least one additive. Methods of making and using the lubricating oil compositions are also described.

Description

FIELD[0001]Provided herein are lubricating oil compositions comprising a base oil, an oil soluble molybdenum compound and a zinc dithiophosphate compound. Methods of making and using the lubricating oil compositions are also described.BACKGROUND[0002]Lubricating oil compositions used to lubricate internal combustion engines contain base oil of lubricating viscosity, or a mixture of such oils, and additives used to improve the performance characteristics of the oil. For example, additives are used to improve detergency, to reduce engine wear, to provide stability against heat and oxidation, to reduce oil consumption, to inhibit corrosion, to act as a dispersant, and to reduce friction loss. Some additives provide multiple benefits, such as dispersant-viscosity modifiers. Other additives, while improving one characteristic of the lubricating oil, have an adverse effect on other characteristics. Thus, to provide lubricating oil having optimal overall performance, it is necessary to cha...

Claims

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Application Information

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IPC IPC(8): C10M125/24C10M125/10
CPCC10M141/10C10M2219/062C10N2240/104C10N2240/103C10N2240/10C10N2230/54C10N2230/42C10N2230/06C10M2227/066C10M2223/045C10M2219/082C10M2219/068C10N2210/06C10N2210/02C10N2030/06C10N2040/25C10N2030/42C10N2030/54C10N2040/253C10N2040/255C10N2010/12C10N2010/04
Inventor BOFFA, ALEXANDER B.TAKEOKA, KENJI
Owner BOFFA ALEXANDER B
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