Low phosphorus lubricating oil composition having lead corrosion control

a phosphorus lubricating oil and low phosphorus technology, applied in the petroleum industry, lubricant compositions, additives, etc., can solve the problems of reducing catalyst efficiency, reducing catalyst efficiency, and reducing catalyst efficiency and effective, so as to improve lead corrosion, improve lead corrosion, and low phosphorus

Inactive Publication Date: 2013-05-30
CHEVRON ORONITE CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The composition provides improved lead corrosion control and maintains anti-wear performance, reducing engine wear and extending catalyst efficiency by using a synergistic combination of zinc dithiophosphates in a low phosphorus content lubricating oil.

Problems solved by technology

One problem arising with the use of such converters is poisoning of the catalyst resulting in reduced catalyst efficiency.
Since catalytic converters are intended for extended use, catalyst poisoning results in higher levels of atmospheric discharges of pollutants from internal combustion engines over prolonged periods of time.
In any event, the phosphorus is known to accumulate in the catalytic converter, at active metal sites; thus reducing catalyst efficiency and effectively over time, poisoning the catalyst.
A problem arises when the level of phosphorus is reduced in a lubricant composition containing an oil-soluble, phosphorus-containing, anti-wear compound in that there is a significant reduction in anti-wear performance arising from this diminution in phosphorus content, One well known class of antiwear additives are metal alkylphosphates, especially zinc dialkyl dithiophosphates, are generally employed in lubricating oils at phosphorous levels above 0.1 weight percent when used for wear control, At lower levels, it is not found to be an effective antiwear additive.
For instance, as exemplified in U.S. Pat. No. 6,696,393, issued Feb. 24, 2004, lowering the level of phosphorus due to the presence of a metal dithiophosphate additive in a lubricant composition by one-half from 0.095 weight percent to 0.048 weight percent phosphorus results in about a seven-fold increase in engine wear.

Method used

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  • Low phosphorus lubricating oil composition having lead corrosion control

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example 1

[0072]The low phosphorus lubricating oil composition of the present invention was prepared by blending a 0.78 wt % mixture of zinc bis(O,O′-di-(2-ethyl-1-hexyl) dithiophosphate (0.24 wt %, primary), zinc bis(O,O′-di-(2-butyl / 4-methyl-2-pentyl) dithiophosphate (0.15 wt %, secondary) and zinc bis(O,O′-di-(dodecylphenyl) dithiophosphate (0.39 wt %, aryl) with a Group II base oil of lubricating viscosity. The ratio of zinc bis(O,O′-di(2-ethyl-1-hexyl) dithiophosphate to zinc bis(O,O′-di-(2-butyl / 4-methyl-2-pentyl) dithiophosphate was about 1:1, based on the phosphorus content. The ratio of the mixture of zinc bis(O,O′-di(2-ethyl-1-hexyl) dithiophosphate and zinc bis(O,O′-di-(2-butyl / 4-methyl-2-pentyl) dithiophosphate to zinc bis(O,O′-di-(dodecylphenyl) dithiophosphate was about 2:1, based on the phosphorus content. The resulting ratio of the throe-way mixture of zinc bis(O,O′-di(2-ethyl-1-hexyl) dithiophosphate to zinc bis(O,O′-di-(2-butyl / 4-methyl-2-pentyl) dithiophosphate to zinc bis(...

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Abstract

The present invention provides a low phosphorus lubricating oil composition containing a mixture of zinc dithiophosphates in a certain ratio surprisingly yields improved lead corrosion. The synergistic combination of mixed zinc dithiophosphates containing a zinc primary dialkyl dithiophosphate, zinc secondary dialkyl dithiophosphate and zinc diaryl dithiophosphate in a respective ratio, based on the phosphorus content, of the zinc primary dialkyl dithiphosphate to zinc secondary dialkyl dithiophosphate from about 2:1 to about 1:2 and the ratio of the mixture of zinc primary dialkyl dithiophosphate and zinc secondary dialkyl dithiophosphate to zinc diaryl dithiophosphate from about 6:1 to about 1:1. When used in a lubricating oil composition having a total phosphorus content less than about 0.06 wt %, based on the total weight of the lubricating oil composition to lubricate internal combustion engines. The mixture of zinc dithiophosphates greatly reduces lead corrosion.

Description

[0001]The present invention is related, in part, to a lubricating oil composition. More particularly, the present invention relates to a low phosphorus lubricating oil composition employing a mixture of zinc dithiophosphates and wherein the lubricating oil composition has less than about 0.06 wt % total phosphorus content based on the total weight of the lubricating oil composition. The low phosphorus lubricating oil composition of the present invention is effective in lead corrosion control when used as a lubricating oil composition in internal combustion engines.BACKGROUND OF THE INVENTION[0002]Emissions arising from automotive exhaust has been a problem for several decades and approaches for addressing this problem have included the use of unleaded fuel (to deal, in part, with lead pollution arising from leaded fuels), oxygenated fuel (to reduce hydrocarbon emissions), the use of catalytic converters (also to reduce hydrocarbon emissions), etc.[0003]Catalytic converters are now u...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C10M169/04
CPCC10M137/10C10M169/04C10M2207/028C10M2215/064C10M2215/28C10M2219/044C10M2223/045C10N2210/02C10N2220/021C10N2230/12C10N2230/42C10N2230/43C10N2230/45C10N2240/10C10M2207/026C10N2020/04C10N2030/12C10N2030/43C10N2030/42C10N2030/45C10N2010/04C10N2040/25
InventorBOFFA, ALEXANDER B.
OwnerCHEVRON ORONITE CO LLC