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 deposit reduction, wear and oxidation corrosion inhibition, and low sulfur and sulfate 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 boron and molybdenum-containing lubricating oil compositions of the present invention advantageously provide high deposit reduction, wear and oxidation-corrosion inhibition when used in an internal combustion engine while employing relatively low levels of sulfur and sulfated ash content. In addition, the high deposit reduction, wear and oxidation-corrosion inhibition can be achieved with the boron and 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
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Examples

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example 1

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

[0097](1) 750 ppm, in terms of boron content, of a combination of a borated dispersant (8.4 wt. % in the finished oil), a borated glycerol monooleate (0.9 wt. % in the finished oil) and a borated sulfonate (3 mmol / kg in the finished oil) having a total base number (TBN) of 160. The term “Total Base Number” or “TBN” refers to the amount of base equivalent to milligrams of KOH in 1 gram of sample. Thus, higher TBN numbers reflect more alkaline products and therefore a greater alkalinity reserve. For the purposes of this invention, TBN is determined by ASTM Test No. D2896.

[0098](2) 1200 ppm, in terms of molybdenum content, of a molybdenum succinimide complex.

[0099](3) 2.6 wt. % of a dispersant.

[0100](4) 12 mmol / kg total of one or more detergents.

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

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

example 2

[0126]A lubricating oil composition was prepared by blending together the following components to obtain a SAE 15W-40 viscosity grade formulation:

[0127](1) 750 ppm, in terms of boron content, of a combination of a borated dispersant (5.2 wt. % in the finished oil), borated sulfonate (3 mmol / kg in the finished oil) having a TBN of 160 and a dispersed hydrated sodium borate (0.5 wt. % in the finished oil).

[0128](2) 1200 ppm, in terms of molybdenum content, of a molybdenum succinimide complex.

[0129](3) 2.6 wt. % of a dispersant.

[0130](4) 12 mmol / kg total of one or more detergents.

[0131](5) 1 wt. % of a diphenylamine antioxidant.

[0132](6) 1 wt. % of a hindered phenol antioxidant.

[0133](7) 0.5 wt. % of a pour point depressant.

[0134](8) 0.7 wt. % of a methylene bis(di-n-butyl dithiocarbamate).

[0135](9) 3.7 wt. % of a dispersant viscosity index improver.

[0136](10) 10 ppm, in terms of silicon content, of a foam inhibitor.

[0137](11) The remainder was diluent oil composed of approximately 63 ...

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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 greater than 400 ppm of boron, based upon the total mass of the composition; 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): C10M139/06C10M125/26C10M139/00
CPCC10M141/12C10M135/10C10M2201/087C10M2203/1006C10M2203/1025C10M2207/026C10M2207/042C10M2207/289C10M2215/064C10M2215/08C10M2215/28C10M2219/022C10M2219/044C10M2219/046C10M2219/066C10M2219/068C10M2219/102C10M2223/045C10M2227/061C10M2227/062C10M2227/09C10M2229/02C10N2230/02C10N2230/04C10N2230/06C10N2230/42C10N2230/43C10N2230/45C10N2240/10C10N2240/102C10N2240/104C10N2260/14C10M163/00C10N2210/06C10N2220/022C10N2210/02C10N2030/04C10N2030/02C10N2030/43C10N2030/42C10N2030/45C10N2030/06C10N2040/25C10N2040/252C10N2040/255C10N2060/14C10N2010/12C10N2020/02C10N2010/04
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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