Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Reexamination Certificate
2002-05-09
2004-08-31
McAvoy, Ellen M. (Department: 1764)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
C508S518000
Reexamination Certificate
active
06784143
ABSTRACT:
The present invention concerns the use of a defined detergent composition in a lubricating oil composition for reducing wear in an engine. It also relates to a lubricating oil composition for use in an internal combustion engine, preferably a heavy duty diesel engine, and a method for the preparation thereof.
The need for less toxic emissions from exhaust gases is becoming more demanding, mainly because of environmental problems such as the emission of pollutants such as hydrocarbons, carbon monoxide and nitrogen oxides. Catalytic converters in the exhaust systems have been used to reduce the emission of pollutants. Such converters generally use a combination of catalytic metals, such as platinum or variations thereof and metal oxides, and are installed in the exhaust streams, e.g. the exhaust pipes of automobiles to convert the toxic gases to non-toxic gases. Phosphorus components, such as the decomposition products of the zinc dithiophosphate, are believed to poison the catalyst in these converters. Also it is likely that sulfur components poison the catalysts, for example those used in reduction of nitrogen oxides.
Thus, there is automotive industry pressure towards reducing phosphorus and sulfur contents in lubricating oil compositions.
This can be achieved by reducing the amount of phosphorus and sulfur components in the oil composition, for example, by reducing the amount of zinc dithiophosphate. However, this presents problems, for example, lowering the anti-wear properties and anti-oxidant properties of the oil composition.
Generally, the art describes phosphorus-, sulfur- and molybdenum-containing compounds as anti-wear and/or anti-oxidant additives.
It has surprisingly been found that a particular detergent composition provides anti-wear benefit to lubricating oil compositions having a low phosphorus content, and optionally a low sulfur content, preferably to lubricating oil compositions which have both low phosphorus and low sulfur contents.
Therefore, in a first aspect, the present invention provides the use, in a minor amount, of a detergent composition comprising one or more metal detergents which comprises metal salts of organic acids, wherein the detergent composition comprises more than 50 mole % of a metal salt of an aromatic carboxylic acid, based on the moles of the metal salts of organic acids in the detergent composition, in a lubricating oil composition for reducing wear in an engine, wherein the amount of phosphorus and sulfur in the oil composition is less than 0.09 mass % and at most 0.5 mass % respectively, based on the mass of the oil composition.
It has also been found that another particular detergent composition provides oxidation resistance to lubricating oil compositions having a low phosphorus content, and optionally a low sulfur content, preferably to lubricating oil compositions which have both low phosphorus and low sulfur contents
Accordingly, in a second aspect, the present invention provides the use, in a minor amount, of a detergent composition comprising one or more metal detergents which comprises metal salts of organic acids, wherein the detergent composition comprises more than 50 mole %, based on the moles of the metal salts of organic acids in the detergent composition, of:
(I) a metal salt of an aromatic carboxylic acid, or
(II) a metal salt of a phenol, or
(III) both a metal salt of an aromatic carboxylic acid and a metal salt of a phenol,
in a lubricating oil composition for improving the oxidation resistance or control of the lubricating oil composition, wherein the amount of phosphorus and sulfur in the oil composition is less than 0.09 mass % and at most 0.5 mass % respectively, based on the mass of the oil composition.
In a third aspect, the present invention provides an SAE 5WX or SAE 0WX lubricating oil composition comprising:
(A) an oil of lubricating viscosity, in a major amount, and added thereto:
(B) a detergent composition comprising one or more metal detergents which comprises metal salts of organic acids, in a minor amount, wherein the detergent composition comprises more than 50 mole %, based on the moles of the metal salts of organic acids in the detergent composition, of:
(B1) a metal salt of an aromatic carboxylic acid, or
(B2) a metal salt of a phenol, or
(B3) both a metal salt of an aromatic carboxylic acid and a metal salt of a phenol, and
(C) co-additives comprising (C1) a dispersant additive and/or a dispersant viscosity index improver additive, (C2) an antioxidant additive and (C3) an antiwear additive, in respective minor amounts;
wherein the amount of phosphorus derived from (B) or (C) or both (B) and (C) is less than 0.09 mass %; and the amount of sulfur derived from (B) or (C) or both (B) and (C) is at most 0.5 mass %; each based on the mass of the oil composition; and X represents any one of 20, 30, 40 and 50. The terms 5WX and 0WX, where X is any one of 20, 30, 40 and 50, is derived from the SAE J300 classification.
In a fourth aspect, the present invention provides a lubricating oil composition comprising:
(A) an oil of lubricating viscosity, in a major amount, and added thereto:
(B) a detergent composition comprising one or more metal detergents which comprises metal salts of organic acids, in a minor amount, wherein the detergent composition comprises more than 50 mole %, based on the moles of the metal salts of organic acids in the detergent composition, of:
(B1) a metal salt of an aromatic carboxylic acid, or
(B2) a metal salt of a phenol, or
(B3) both a metal salt of an aromatic carboxylic acid and a metal salt of a phenol, and
(C) co-additives comprising (C1) a dispersant viscosity index improver additive, (C2) an antioxidant additive and (C3) an antiwear additive, in respective minor amounts;
wherein the amount of phosphorus derived from (B) or (C) or both (B) and (C) is less than 0.09 mass %; and the amount of sulfur derived from (B) or (C) or both (B) and (C) is at most 0.5 mass %; each based on the mass of the oil composition.
In a fifth aspect, the present invention provides a lubricating oil composition comprising:
(A) an oil of lubricating viscosity, in a major amount, and added thereto:
(B) a detergent composition comprising at least one detergent that contains metal salts of more than one type of organic acid, in a minor amount, wherein the detergent composition comprises more than 50 mole %, based on the moles of the metal salts of organic acids in the detergent composition, of:
(B1) a metal salt of an aromatic carboxylic acid, or
(B2) a metal salt of a phenol, or
(B3) both a metal salt of an aromatic carboxylic acid and a metal salt of a phenol, and
(C) co-additives comprising (C1) a dispersant and/or a dispersant viscosity index improver additive, (C2) an antioxidant additive and (C3) an antiwear additive, in respective minor amounts;
wherein the amount of phosphorus derived from (B) or (C) or both (B) and (C) is less than 0.09 mass %; and the amount of sulfur derived from (B) or (C) or both (B) and (C) is at most 0.5 mass %; each based on the mass of the oil composition.
In a sixth aspect, the present invention provides a lubricating oil composition comprising:
(A) an oil of lubricating viscosity comprising a synthetic basestock, in a major amount, and added thereto:
(B) a detergent composition comprising one or more metal detergents which comprises metal salts of organic acids, in a minor amount, wherein the detergent composition comprises more than 50 mole %, based on the moles of the metal salts of organic acids in the detergent composition, of:
(B1) a metal salt of an aromatic carboxylic acid, or
(B2) a metal salt of a phenol, or
(B3) both a metal salt of an aromatic carboxylic acid and a metal salt of a phenol, and
(C) co-additives comprising (C1) a dispersant and/or a dispersant viscosity index improver additive, (C2) an antioxidant additive and (C3) an antiwear additive, in respective minor amounts;
wherein the amount of phosphorus derived from (B) or (C) or both (B) and (C) is less than 0.09 mass %, and the amount of sulfur derived from (B) or (C) or both (B) and (C) is
Arrowsmith Stephen
Castle Rebecca C.
Galsworthy Jane R.
Locke Christopher J.
Stevens Mark G.
Infineum International Ltd.
McAvoy Ellen M.
LandOfFree
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