Lubricating oil compositions

a technology of lubricating oil and composition, applied in the direction of lubricant composition, additives, shafts and bearings, etc., to achieve the effects of high wear inhibition, and low sulfated ash conten

Inactive Publication Date: 2010-06-17
CHEVRON ORONITE CO LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]The molybdenum-containing lubricating oil compositions of the present invention advantageously provide high wear inhibition when used in an internal combustion engine while containing relatively low levels of sulfated ash content. In addition, the high wear inhibition can be achieved with the molybdenum-containing lubricating oil compositions of the present invention while also employing relatively low levels (or substantially free) of any phosphorus and zinc content.

Problems solved by technology

Exhaust after-treatment devices, equipped on internal combustion engines to comply with emission regulations, have proven to be sensitive to the combustion by products of the fuel and lubricant used in the engine.

Method used

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  • Lubricating oil compositions
  • Lubricating oil compositions
  • Lubricating oil compositions

Examples

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example 1

[0096]A lubricating oil composition was prepared by blending together the following components to obtain a SAE 15W-40 viscosity grade formulation:

[0097](1) 2300 ppm, in terms of sulfur content, of a combination of a methylene bis di-n-butyl dithiocarbamate (0.7 wt. % in the finished oil) and one or more detergents, wherein 1900 ppm of sulfur is derived from active sulfur (i.e., methylene bis di-n-butyl dithiocarbamate) and 400 ppm of sulfur is derived from nonactive sulfur compound (i.e., the detergent).

[0098](2) 400 ppm, in terms of boron content, of a combination of a borated dispersant (5.2 wt. % in the finished oil) and borated sulfonate (3 mmol / kg in the finished oil) having a total base number (TBN) of 160.

[0099](3) 1200 ppm, in terms of molybdenum content, of a molybdenum succinimide complex.

[0100](4) 2.6 wt. % of a dispersant.

[0101](5) 1 wt. % of a diphenylamine antioxidant.

[0102](6) 1 wt. % of a hindered phenol antioxidant.

[0103](7) 0.3 wt. % of a pour point depressant.

[010...

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Abstract

A lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 is disclosed which comprises (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound having no more than about 400 ppm of boron; and (c) at least one oil-soluble or dispersed oil-stable molybdenum-containing compound having at least about 1100 ppm of molybdenum, based upon the total mass of the composition; wherein the lubricating oil composition has a ratio of sulfur to molybdenum of less than or equal to about 4:1.

Description

BACKGROUND OF THE INVENTION[0001]1. Technical Field[0002]The present invention generally relates to lubricating oil compositions.[0003]2. Description of the Related Art[0004]Exhaust after-treatment devices, equipped on internal combustion engines to comply with emission regulations, have proven to be sensitive to the combustion by products of the fuel and lubricant used in the engine. In addition, certain types of devices are sensitive to one or more of the following: (1) phosphorus coming from the lubricant, (2) sulfur coming from both fuel and lubricant, and (3) sulfated ash resulting from the combustion of fuel and lubricant. In order to ensure the durability of the different types of after-treatment devices, special lubricants are being developed that feature relatively low levels of, for example, sulfur, phosphorus, and sulfated ash.[0005]U.S. Patent Application Publication No. 20050043191 (“the '191 application”) discloses a lubricating oil composition having less than 2000 pp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M139/06C10M125/26
CPCC10M141/12C10M163/00C10N2260/14C10N2240/104C10N2240/102C10N2240/10C10N2230/45C10N2230/43C10N2230/42C10M2227/09C10M2227/062C10M2227/061C10M2219/102C10M2201/087C10M2203/1006C10M2207/026C10M2207/042C10M2215/064C10M2215/08C10M2215/28C10M2219/044C10M2219/046C10M2219/066C10M2219/068C10N2210/06C10N2030/42C10N2030/43C10N2030/45C10N2040/25C10N2040/252C10N2040/255C10N2060/14C10N2010/12
Inventor NELSON, KENNETH D.BOFFA, ALEXANDER B.KLEISER, WILLIAM M.STULTS, STEPHEN D.MCGEEHAN, JAMES A.DAM, WIM VANCHERPECK, RICHARD E.
Owner CHEVRON ORONITE CO LLC
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