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Lubricating oil composition

a technology of lubricating oil and composition, which is applied in the direction of lubricant composition, petroleum industry, additives, etc., can solve the problems of copper corrosion, salicylate detergents may contribute to the deterioration of nitrile rubber seal materials, etc., and achieve the effect of improving performan

Inactive Publication Date: 2006-12-07
IRVING MATTHEW D +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The patent text describes a method of improving the compatibility of lubricating oil compositions with nitrile rubber engine and transmission seals, as well as copper corrosion performance. This is achieved by adding a small amount of a non-hydrogenated (unsaturated) olefin (co)polymer to the lubricating oil composition. The lubricating oil composition should also contain a significant amount of sulfur, such as at least 0.10 mass%. The addition of the co(polymer) can improve the seal compatibility of the lubricating oil composition, even in cases where it contains a high amount of sulfur. The patent also describes specific types of sulfur-containing additives that can further enhance the performance of the lubricating oil composition."

Problems solved by technology

It is also suspected that high levels of salicylate soap from salicylate detergents may contribute to the deterioration of nitrile rubber seal materials, particularly in “low ash” lubricants.
Lubricant sulfur has been found to cause copper corrosion.

Method used

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  • Lubricating oil composition

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0110] A lubricating oil composition representing a low SAPS (sulfated ash, phosphorus, sulfur) 10W40 crankcase lubricant for a heavy duty diesel engine meeting the requirements of the ACEA E6-04 specification was prepared by blending a base stock oil of lubricating viscosity, a detergent / inhibitor (DI) package including salicylate detergent, dispersant, ZDDP and antifoamant; a viscosity modifier and LOFI (lube oil flow improver). The resulting composition had a nitrogen content of 0.16 mass %; a sulfur content of 0.25 mass %, a sulfated ash (SASH) content of 0.25 mass % and 800 ppm of phosphorus and 24 mmol of salicylate soap per kilogram of finished lubricant.

[0111] Four lubricating oil compositions were prepared based on the above recipe. Example 5, a comparative example, contained no added 450 Mn polybutene (PIB). Examples 2, 3 and 4, which represent the invention, contained 2.1, 2.5 and 3.0 mass % of 950 Mn PIB, respectively. The four samples were then tested for compatibility...

example 3

[0113] A lubricating oil composition representing a 15W40 crankcase lubricant for a heavy duty diesel engine meeting the requirements of the PC-10 specification was prepared by blending a base stock oil of lubricating viscosity, a detergent / inhibitor (DI) package including sulfonate and sulfurized phenate detergent, dispersant, ZDDP, a molybdenum-sulfur compound, and antifoamant; a dispersant / viscosity modifier and LOFI (lube oil flow improver). The resulting composition had a sulfur content of 0.31 mass %, a nitrogen content of 0.14, a SASH content of 0.94; 50 ppm of molybdenum and 1000 ppm of phosphorus.

[0114] Four lubricating oil compositions were prepared based on the above recipe. Example 9, a comparative example, contained no added 950 Mn polybutene (PIB). Examples 10, 11 and 12, which represent the invention, contained 0.5, 1.0 and 2.0 mass % of 950 Mn PIB, respectively. The four samples were then tested for compatibility with nitrile rubber in the bench tests described in E...

example 4

[0116] Five lubricating oil compositions were prepared based on the recipe provided in Example 3. Example 13, a comparative example, contained no added 950 Mn polybutene (PIB). Examples 14, 15, 16 and 17, which represent the invention, contained 2, 3, 4 and 5 mass % of 950 Mn PIB, respectively. The five samples were then tested for corrosion, particularly copper corrosion, using the High Temperature Corrosion Bench Test described in ASTM D6594. The results are shown below in Table V.

TABLE VEx. 14Ex. 15Ex. 16Ex. 12PropertyLimitEx. 13(2)(3)(4)(5)Cu 20 max1112413129Pb120 max4436373842Sn 50 max02222Cu Strip 34B1A1A1A1A

[0117] As demonstrated, the addition of PIB to a lubricating oil composition containing a significant sulfur content further improves copper corrosion performance and allows passage of the HTCBT with a formulation that fails the test in the absence of the PIB.

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Abstract

A method of improving the seal compatibility and / or copper corrosion performance of lubricating oil compositions for the lubrication of the crankcases of an internal combustion engine, which method includes the step of adding to the lubricating oil compositions a minor amount of a non-hydrogenated (unsaturated) olefin polymer. Also described are lubricating oil compositions for engines and transmissions, which compositions contain sulphur and / or a salicylate soap and a minor amount of a non-hydrogenated (unsaturated) polymer, which compositions are compatible with nitrile rubber engine and transmission seals and copper-containing engine and transmission components.

Description

FIELD OF THE INVENTION [0001] This invention relates to a method of improving the seal-compatibility performance of lubricating oil compositions used in engine crankcases and transmissions, particularly lubricating oil compositions having significant sulphur and / or salicylate soap contents, and to lubricating oil compositions having significant sulphur and / or salicylate soap contents that exhibit enhanced seals compatibility performance in engines and transmissions containing nitrile rubber seal materials. The invention further relates to a method of improving copper corrosion performance of lubricating oil compositions used in engine crankcases and transmissions, particularly lubricating oil compositions having significant sulphur contents, and to lubricating oil compositions having significant sulphur contents that exhibit enhanced seals and copper corrosion performance. BACKGROUND OF THE INVENTION [0002] Lubricating oil compositions used to lubricate internal combustion engines a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M135/18
CPCC10M161/00C10N2240/102C10M167/00C10M2205/026C10M2207/144C10M2207/262C10M2219/044C10M2219/046C10M2219/066C10M2219/068C10M2219/088C10M2219/089C10M2223/045C10N2210/01C10N2210/02C10N2210/06C10N2220/026C10N2230/12C10N2230/36C10N2230/42C10N2240/04C10M165/00C10N2010/02C10N2010/04C10N2010/12C10N2020/067C10N2030/12C10N2030/36C10N2030/42C10N2040/04C10N2040/252
Inventor IRVING, MATTHEW D.SCOTT, ROBINDIGGS, NANCY Z.GUTIERREZ, JOSE A.ALESSI, MICHAEL L.
Owner IRVING MATTHEW D
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