Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
  • C10M141/06—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic nitrogen-containing compound
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
  • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/08—Amides
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2217/041—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds involving a condensation reaction
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
  • C10M2223/045—Metal containing thio derivatives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/04—Detergent property or dispersant property
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/25—Internal-combustion engines

Definitions

• the present invention relates to a lubricating oil composition for particular use m internal combustion engines .
• WO-A-2005/073551 discloses a non-metal containing lubricating oil additive which is said to have good cleaning performance and a lubricating oil composition comprising the same.
• Said additive is characterised by containing a quaternary ammonium salt having a base number of at least 10 mg.KOH/g.
• a quaternary ammonium salt having a base number of at least 10 mg.KOH/g.
• said additive are said to include quaternary ammonium salts obtained through salt- exchange of counter-amons contained in cationic surfactants such as tetra alkyl ammonium chloride and tetra alkyl ammonium sulphate.
• EP-A-0194718 discloses lubricating oil compositions which contain one or more lubricating oils, one or more basic salts of polyvalent metals and one or more polyesters or salts thereof which are either derived from one or more hydroxycarboxylic acids of the general formula HO-X-COOH, wherein X represents a bivalent saturated or unsaturated aliphatic radical which contains at least 8 carbon atoms and m which at least 4 carbon atoms are situated between the hydroxyl group and the carboxyl group, or derived from a mixture of one or more such hydroxycarboxylic acids and one or more carboxylic acids containing no hydroxyl groups .
• polyesters present m said lubricating oil composition are said to lead to a marked improvement in stability of the one or more basic salts in the lubricating oil composition.
• said polyesters are also said to have a cleansing effect which renders them capable of suppressing fouling of an internal combustion engine.
• Sludge and varnish deposits form through complex interactions of lubricating oil composition components with contaminants under differing engine conditions.
• a lubricating oil composition may not get hot enough for contaminants such as water and fuel components to evaporate.
• a lubricating oil composition can oxidise, producing reactive groups and thickening. These conditions promote reactions with unburnt and partially burnt fuel, water, soot, acids, blow-by gases and other contaminants to form sludges and varnish.
• soot particles can aggregate forming extended structures and gels which increase the low shear viscosity of a lubricating oil composition.
• Such materials can build up to coat engine components and block vital oilways, potentially causing oil starvation and wear. It therefore highly desirable to develop lubricating oil compositions which not only exhibit outstanding abilities to suppress internal combustion engine fouling during continual use, but which also exhibit excellent cleaning performance in reducing deposits in the oil circuit of an internal combustion engines.
• Typical industry recognised methods to assess the cleanliness of an engine are based on deposit rating systems. Such systems typically use a numeric scale from 1 to 10 to define the level of cleanliness, wherein a rating of 10 is defined as completely clean.
• a lubricating oil composition for particular use in internal combustion engines, which lubricating oil composition not only suppresses internal combustion engine fouling and which also exhibits advantageous cleaning performance in the reduction of deposits such as sludge and varnish.
• the present invention provides a lubricating oil composition
• a lubricating oil composition comprising lubricating oil base oil, one or more anti-wear additives and one or more poly (hydroxycarboxylic acid) amide salt derivatives preparable by reaction of an amine and a poly (hydroxycarboxylic acid) of formula (I)
• Y is hydrogen or optionally substituted hydrocarbyl group
• A is a divalent optionally substituted hydrocarbyl group
• n is from 1 to 100, preferably from 1 to 10, with an acid or a quaternizing agent.
• hydrocarbyl represents a radical formed by removal of one or more hydrogen atoms from a carbon atom of a hydrocarbon (not necessarily the— same carbon atoms in case more hydrogen atoms are removed) .
• Hydrocarbyl groups may be aromatic, aliphatic, acyclic or cyclic groups.
• hydrocarbyl groups are aryl, cycloalkyl, alkyl or alkenyl, in which case they may be straight-chain or branched-chain groups.
• Representative hydrocarbyl groups include phenyl, naphthyl, methyl, ethyl, butyl, pentyl, methylpentyl, hexenyl, dimethylhexyl, octenyl, cyclooctenyl, methylcyclooctenyl , dimethylcyclooctyl, ethylhexyl, octyl, isooctyl, dodecyl, hexadecenyl, eicosyl, hexacosyl, triacontyl and phenylethyl.
• hydrocarbyl optionally substituted hydrocarbyl groups optionally containing one or more "inert” heteroatom-containing functional groups.
• inert is meant that the functional groups do not interfere to any substantial degree with the function of the compound.
• the optionally substituted hydrocarbyl group Y in formula (I) herein is preferably aryl, alkyl or alkenyl containing up to 50 carbon atoms, more preferably in the range of from 7 to 25 carbon atoms.
• the optionally substituted hydrocarbyl group Y may be conveniently selected from heptyl, octyl, undecyl, lauryl, heptadecyl, heptadenyl, heptadecadienyl, stearyl, oleyl and linoleyl.
• optionally substituted hydrocarbyl group Y in formula (I) herein include C 4 _ 8 cycloalkyls such as cyclohexyl; polycycloalkyls such as polycyclic terpenyl groups which are derived from naturally occurring acids such as abietic acid; aryls such as phenyl; aralkyls such as benzyl; and polyaryls such as naphthyl, biphenyl, stibenyl and phenylmethylphenyl .
• the optionally substituted hydrocarbyl group Y may contain one or more functional groups such as carbonyl, carboxyl, nitro, hydroxy, halo, alkoxy, tertiary amino (no N-H linkages), oxy, cyano, sulphonyl and sulphoxyl.
• the majority of the atoms, other than hydrogen, in substituted hydrocarbyl groups are generally carbon, with the heteroatoms (e.g., oxygen, nitrogen and sulphur) generally representing only a minority, about 33% or less, of the total non-hydrogen atoms present.
• the hydrocarbyl group Y in formula (I) is more preferably unsubstituted or substituted by a group selected from hydroxy, halo or alkoxy group, even more preferably Ci_ 4 alkoxy.
• the optionally substituted hydrocarbyl group Y in formula (I) is a stearyl group, 12-hydroxystearyl group, an oleyl group, a 12- hydroxyoleyl group or a group derived from naturally occurring oil such as tall oil fatty acid.
• the one or more poly (hydroxycarboxylic acid) amide salt derivatives are sulphur-containing poly (hydroxycarboxylic acid) amide salt derivatives.
• said one or more poly (hydroxycarboxylic acid) amide salt derivatives have a sulphur content in the range of from 0.1 to 2.0 wt . %, even more preferably in the range of from 0.6 to 1.2 wt . % sulphur, as measured by ICP-AES, based on the total weight of said poly (hydroxycarboxylic acid) amide salt derivatives .
• poly (hydroxycarboxylic acid) and its amide or other derivatives is known and is described, for instance, in EP-A-0164817 , WO-A-95/17473, WO-A- 96/07689, US-A-5536445, GB-A-2001083, GB-A-1342746, GB-A- 1373660, US-A-5000792 and US-A-4349389.
• the poly (hydroxycarboxylic acid) s of formula (I) may be made by the interesterification of one or more hydroxycarboxylic acids of formula (II)
• the chain terminator in said interesterification may be a non-hydroxycarboxylic acid.
• the hydroxyl group in the hydroxycarboxylic acid and the carboxylic acid group in the hydroxycarboxylic acid or the non-hydroxycarboxylic acid may be primary, secondary or tertiary in character.
• the interesterification of the hydroxycarboxylic acid and the non-hydroxycarboxylic acid chain terminator may be effected by heating the starting materials, optionally in a suitable hydrocarbon solvent such as toluene or xylene, and azeotropmg off the formed water. The reaction may be carried out at a temperature up to— 250 0 C, conveniently at the reflux temperature of the solvent .
• the temperature employed should not be so high as to lead to dehydration of the acid molecule.
• Catalysts for the interesterification such as p-toluenesulphonic acid, zinc acetate, zirconium naphthenate or tetrabutyl titanate, may be included, with the objective of either increasing the rate of reaction at a given temperature or of reducing the temperature required for a given rate of reaction.
• A is preferably an optionally substituted aromatic, aliphatic or cycloaliphatic straight chain or branched divalent hydrocarbyl group.
• A is an arylene, alkylene or alkenylene group, in particular an arylene, alkylene or alkenylene group containing in the range of from 4 to 25 carbon atoms, more preferably m the range of from 12 to 20 carbon atoms.
• said compounds of formulae (I) and (II) there are at least 4 carbon atoms, more preferably in the range of from 8 to 14 carbon atoms connected directly between the carbonyl group and the oxygen atom derived from the hydroxyl group.
• the optional substituents in the group A are preferably selected from hydroxy, halo or alkoxy groups, more preferably Ci_ 4 alkoxy groups.
• the hydroxyl group xn the hydroxycarboxylic acids of formula (II) is preferably a secondary hydroxyl group.
• suitable hydroxycarboxylic acids are 9- hydroxystea ⁇ c acid, 10-hydroxystearic acid, 12- hydroxystea ⁇ c acid, 12-hydroxy-9-oleic acid (ricinoleic acid) , 6-hydroxycaproic acid, preferably 12- hydroxystea ⁇ c acid.
• Commercial 12-hydroxystearic acid hydrogenated castor oil fatty acid
• the non-hydroxycarboxylic acid is introduced separately to the reaction, the proportion which is required m order to produce a polymer or oligomer of a given molecular weight can be determined either by simple experiment or by calculation by the person skilled in the art.
• the group (-O-A-CO-) in the compounds of formulae (I) and (II) is preferably a 12-oxystearyl group, 12- oxyoleyl group or a 6-oxycaproyl group.
• Preferred poly (hydroxycarboxylic acid) s of formula (I) for reaction with amine include poly (hydroxystearic acid) and poly (hydroxyoleic acid).
• the amines which react with poly (hydroxycarboxylic acid) s of formula (I) to form poly (hydroxycarboxylic acid) amide intermediates may include those defined in WO-A-97/41092.
• the amine reactant is preferably a diamine, a triamine or a polyamine.
• Preferred amine reactants are diamines selected from ethylenediamme, N, N-dimethyl-1, 3-propanediamine, triaraines and polyamines selected from dietheylenetriamine, triethylenetetramme, tetraethylenepentamine, pentaethylenehexamme and tris (2-aminoethyl) amine .
• the amidation between the amine reactant and the (poly (hydroxycarboxylic acid) of formula (I) may be carried out according to methods known to those skilled m the art, by heating the poly (hydroxycarboxylic acid) with the amine reactant, optionally in a suitable hydrocarbon solvent such as toluene or xylene, and azeotropmg off the formed water. Said reaction may be carried out in the presence of a catalyst such as p-toluenesulphonic acxd, zinc acetate, zirconium naphthenate or tetrabutyl titanate.
• a catalyst such as p-toluenesulphonic acxd, zinc acetate, zirconium naphthenate or tetrabutyl titanate.
• GB-A-1373660 discloses poly (hydroxycarboxylic acid) amide derivatives with amines such as 3-dimethylammopropylamine and ethylenediamme for use as dispersing agents in dispersions of pigments in organic liquids.
• GB-A-2001083 discloses poly (hydroxycarboxylic acid) amide derivatives with poly (ethyleneimme) (PEI) having a molecular weight (MW) greater than 500 for a similar use.
• PEI poly (ethyleneimme)
• poly (hydroxycarboxylic acid) amide derivatives with amines of the formula of NH 2 -R' -N (R") - R"' -NH 2 are disclosed for use as pigment dispersing agent .
• WO-A-95/17473 discloses poly (hydroxycarboxylic acid) amide derivatives with amines such as 3- dimethylaminopropylamine , ethylenediamine , poly (ethyleneimine) (PEI) having a molecular weight (MW) greater than 500 and amines of the formula of NH 2 -R'- N (R") -R"' -NH 2 for use in a method of preparing a non- aqueous dispersion of copper phthalocyanine .
• PEI poly (ethyleneimine)
• US-A-4349389 discloses poly (hydroxycarboxylic acid) amide derivatives with amines such as 3-dimethyl- aminopropylamine, poly (ethyleneimine) (PEI) having a molecular weight (MW) greater than 500 as dispersing agent in the preparation of a dispersible inorganic pigment composition.
• PEI poly (ethyleneimine)
• EP-A-0164817 discloses poly (hydroxycarboxylic acid) amide derivatives with polyamines (ethylenediamine, diethylenetriamine, etc.), aminoalcohols (diethanolamine, etc.) and ester derivatives with polyols (glycerol, etc.) for use as surfactant suitable for stabilising dispersions of solids in organic liquids and oil/water emulsions .
• the poly (hydroxycarboxylic acid) amide intermediate formed from reaction of the amine and the poly (hydroxycarboxylic acid) of formula (I) is reacted with an acid or a quaternizing agent to form a salt derivative, according to well-known methods.
• Acids that may be used to form the salt derivative may be selected from organic or inorganic acids.
• Said acids are preferably sulphur-containing organic or inorganic acids.
• said acids are selected from sulphuric acid, methanesulphonic acid and benzenesulphonic acid.
• Quaternizmg agents that may be used to form the salt derivative may be selected from dimethylsulphuric acid, a dialkyl sulphate having from 1 to 4 carbon atoms, an alkyl halide such as methyl chloride, methyl bromide, aryl halide such as benzyl chloride.
• the quaternizmg agent is a sulphur-containing quaternizmg agent, m particular dimethylsulphuric acid or an dialkyl sulphate having from 1 to 4 carbon atoms.
• the quaternizmg agent is preferably dimethyl sulphate.
• Quaternization is a well-known method in the art. For example, quaternization using dimethyl sulphate is described in US-A-3996059, US-A-4349389 and GB-A-1373660.
• the one or more poly (hydroxycarboxylic acid) amide salt derivatives comprise a compound of formula (III):
• Y-CO [O-A-CO] n -Z-R + ] m pX q" (III) wherein Y is hydrogen or optionally substituted hydrocarbyl group, A is a divalent optionally substituted hydrocarbyl group, n is from 1 to 100, preferably from 1 to 10, m is from 1 to 4, q is from 1 to 4 and p is an integer such that pq m, Z is an optionally substituted divalent bridging group which is attached to the carbonyl group through a nitrogen atom, R + is an ammonium group and X q ⁇ is an anion.
• R + may be a primary, secondary, tertiary or quaternary ammonium group.
• R + is preferably a quaternary ammonium group.
• A is preferably a divalent straight chain or branched hydrocarbyl group as hereinbefore described for formulae (I) and (II).
• A is preferably an optionally substituted aromatic, aliphatic or cycloaliphatic straight chain or branched divalent hydrocarbyl group. More preferably, A is an arylene, alkylene or alkenylene group, in particular an arylene, alkylene or alkenylene group containing in the range of from 4 to 25 carbon atoms, more preferably in the range of from 12 to 20 carbon atoms.
• said compound of formula (III) there are at least 4 carbon atoms, more preferably in the range of from 8 to 14 carbon atoms connected directly between the carbonyl group and the oxygen atom derived from the hydroxyl group.
• the optional substituents in the group A are preferably selected from hydroxy, halo or alkoxy groups, especially C 1 - 4 alkoxy groups.
• Y is preferably an optionally substituted hydrocarbyl group as hereinbefore described for formula ( I ) .
• the optionally substituted hydrocarbyl group Y in formula (III) is preferably aryl, alkyl or alkenyl containing up to 50 carbon atoms, more preferably in the range of from 7 to 25 carbon atoms.
• the optionally substituted hydrocarbyl group Y may be conveniently selected from heptyl, octyl, undecyl, lauryl, heptadecyl, heptadenyl, heptadecadienyl, stearyl, oleyl and linoleyl.
• optionally substituted hydrocarbyl group Y in formula (III) herein include C 4 _ 8 cycloalkyls such as cyclohexyl; polycycloalkyls such as polycyclic terpenyl groups which are derived from naturally occurring acids such as abietic acid; aryls such as phenyl; aralkyls such as benzyl; and polyaryls such as naphthyl, biphenyl, stibenyl and phenylmethylphenyl .
• the optionally substituted hydrocarbyl group Y in formula (III) may contain one or more functional groups such as carbonyl, carboxyl, nitro, hydroxy, halo, alkoxy, amino, preferably tertiary amino (no N-H linkages), oxy, cyano, sulphonyl and sulphoxyl .
• the majority of the atoms, other than hydrogen, in substituted hydrocarbyl groups are generally carbon, with the heteroatoms (e.g., oxygen, nitrogen and sulphur) generally representing only a minority, about 33% or less, of the total non-hydrogen atoms present.
• the hydrocarbyl group Y in formula (III) is unsubstituted or substituted by a group selected from hydroxy, halo or alkoxy group, even more preferably Ci- 4 alkoxy.
• the optionally substituted hydrocarbyl group Y in formula (III) is a stearyl group, 12-hydroxystearyl group, an oleyl group or a 12- hydroxyoleyl group, and that derived from naturally occurring oil such as tall oil fatty acid.
• Z is preferably an optionally substituted divalent bridging group represented by formula (IV)
• R 1 wherein R 1 is hydrogen or a hydrocarbyl group and B is an optionally substituted alkylene group.
• hydrocarbyl groups that may represent R 1 include methyl, ethyl, n-propyl, n-butyl and octadecyl .
• optionally substituted alkylene groups that may represent B include ethylene, trimethylene, tetramethylene and hexamethylene .
• Examples of preferred Z moieties in formula (III) include -NHCH 2 CH 2 -, -NHCH 2 C (CH 3 ) 2 CH 2 - and -NH (CH 2 ) 3-.
• R + may be represented by formula (V)
• R 2 , R 3 and R 4 may be selected from hydrogen and alkyl groups such as methyl.
• the anion X q ⁇ of the compound of formula (HI) is a sulphur-containing anion. More preferably said anion is selected from sulphate and sulphonate anions .
• the one or more poly (hydroxycarboxylic acid) amide salt derivatives are present in the lubricating oil composition of the present invention in a preferred amount in the range of from 0.1 to 10.0 wt . %, more preferably in an amount in the range of from 0.1 to 5.0 wt . % and most preferably in an amount in the range of from 0.2 to 4.0 wt . %, based on the total weight of the lubricating oil composition.
• Poly (hydroxycarboxylic acid) amide salt derivatives that are preferred in the present invention are those which each have a TBN (total base number) value of less than 10 mg.KOH/g, as measured by ASTM D 4739. More preferably, the poly (hydroxycarboxylic acid) amide salt derivatives each have a TBN value of less than 5 mg.KOH/g, most preferably 2 mg.KOH/g or less, as measured by ASTM D 4739.
• poly (hydroxycarboxylic acid) amide salt derivatives that are available commercially include that available from Lubrizol under the trade designation "SOLSPERSE 17000” (a reaction product of poly (12- hydroxystearic acid) with N, N-dimethyl-1, 3-propanediamine and dimethyl sulphate) and those available under the trade designations "CH-5" and "CH-7" from Shanghai Sanzheng Polymer Company.
• SOLSPERSE 17000 a reaction product of poly (12- hydroxystearic acid) with N, N-dimethyl-1, 3-propanediamine and dimethyl sulphate
• the one or more anti-wear additives in the lubricating oil composition of the present invention are preferably present in an amount in the range of from 0.01 to 10.0 wt. %, based on the total weight of the lubricating oil composition.
• the one or more anti-wear additives present in the lubricating oil composition may comprise zinc dithiophosphates .
• the or each zinc dithiophosphate may be selected from zinc dialkyl-, diaryl- or alkylaryl- dithiophosphates .
• Preferred zinc dithiophosphates are those that may be conveniently represented by formula (VI) :
• R 5 to R 8 may be the same or different and are each a primary alkyl group containing from 1 to 20 carbon atoms preferably from 3 to 12 carbon atoms, a secondary alkyl group containing from 3 to 20 carbon atoms, preferably from 3 to 12 carbon atoms, an aryl group or an aryl group substituted with an alkyl group, said alkyl substituent containing from 1 to 20 carbon atoms preferably 3 to 18 carbon atoms.
• Zinc dithiophosphate compounds m which R 5 to R 8 are all different from each other can be used alone or in admixture with zinc dithiophosphate compounds in which R 5 to R 8 are all the same.
• the or each zinc dithiophosphate used m the present invention is a zinc dialkyl dithiophosphate.
• zinc dithiophosphates which are commercially available include those available ex.
• Lubrizol Corporation under the trade designations "Lz 677A”, “Lz 1095”, “Lz 1097”, “Lz 1370”, “Lz 1371”, “Lz 1373” and “Lz 1395”, those available ex.
• Chevron Oronite under the trade designations "OLOA 260”, “OLOA 262”, “OLOA 267” and “OLOA 269R”, and those available ex.
• Afton Chemical under the trade designation "HITEC 7169” and "HITEC 7197".
• the lubricating oil composition according to the present invention preferably comprises in the range of from 0.01 to 10.0 wt . % of zinc dithiophosphates, based on total weight of the lubricating oil composition.
• the lubricating oil composition further comprises one or more detergents, in particular one or more salicylate, phenate or sulphonate detergents.
• Said detergents are preferably selected from alkali metal or alkaline earth metal salicylate, phenate or sulphonate detergents. Calcium and magnesium salicylates, phenates and sulphonates are particularly preferred. Said detergents are preferably used in amounts in the range of 0.05 to 12.5 wt . %, more preferably from 1.0 to 9.0 wt. % and most preferably in the range of from 2.0 to 5.0 wt. %, based on the total weight of the lubricating oil composition.
• the base oil used in the present invention may conveniently comprise mixtures of one or more mineral oils and/or one or more synthetic oils.
• Mineral oils include liquid petroleum oils and solvent-treated or acid-treated mineral lubricating oil of the paraffimc, naphthemc, or mixed parafflnic/naphthenic type which may be further refined by hydrofinishmg processes and/or dewaxmg.
• Naphthemc base oils have low viscosity index (VI) (generally 40-80) and a low pour point.
• Such base oils are produced from feedstocks rich m naphthenes and low m wax content and are used mainly for lubricants in which colour and colour stability are important, and VI and oxidation stability are of secondary importance.
• Paraffimc base oils have higher VI (generally >95) and a high pour point. Said base oils are produced from feedstocks rich in paraffins, and are used for lubricants m which VI and oxidation stability are important.
• Fischer-Tropsch derived base oils may be conveniently used as the base oil in the lubricating oil composition of the present invention, for example, the Fischer-Tropsch derived base oils disclosed m EP-A- 0776959, EP-A-0668342, WO-A-97/21788 , WO-A-00/15736, WO- A-00/14188, WO-A-00/14187, WO-A-00/14183, WO-A-00/14179, WO-A-00/08115, WO-A-99/41332, EP-A-1029029, WO-A-01/18156 and WO-A-01/57166.
• the Fischer-Tropsch derived base oils disclosed m EP-A- 0776959, EP-A-0668342, WO-A-97/21788 , WO-A-00/15736, WO- A-00/14188, WO-A-00/14187, WO-A-00/14183, WO-A
• Synthetic processes enable molecules to be built from simpler substances or to have their structures modified to give the precise properties required.
• Synthetic oils include hydrocarbon oils such as olefin oligomers (PAOs), dibasic acid esters, polyol esters, and dewaxed waxy raffmate. Synthetic hydrocarbon base oils sold by the Shell Group under the designation "XHVI” (trade mark) may be conveniently used.
• PAOs olefin oligomers
• XHVI XHVI
• the lubricating oil base oil is constituted from mineral oils and/or synthetic oils which contain more than 80% wt of saturates, preferably more than 90 % wt . , as measured according to ASTM D2007. It is further preferred that the lubricating oil base oil contains less than 1.0 wt . %, preferably less than 0.1 wt . % of sulphur, calculated as elemental sulphur and measured according to ASTM D2622, ASTM D4294, ASTM D4927 or ASTM D3120.
• the viscosity index of the lubricating oil base oil is more than 80, more preferably more than 120, as measured according to ASTM D2270.
• the total amount of lubricating oil base oil incorporated in the lubricating oil composition of the present invention is preferably present m an amount in the range of from 60 to 92 wt . %, more preferably in an amount in the range of from 75 to 90 wt. % and most preferably in an amount in the range of from 75 to 88 wt . %, with respect to the total weight of the lubricating oil composition.
• the lubricating oil composition has a kinematic viscosity m the range of from 2 to 80 mm 2 /s at 100 0 C, more preferably in the range of from 3 to 70 mm 2 /s, most preferably in the range of from 4 to 50 mm /s .
• the lubricating oil composition of the present invention may further comprise additional additives such as anti-oxidants, dispersants, friction modifiers, viscosity index improvers, pour point depressants, corrosion inhibitors, defoammg agents and seal fix or seal compatibility agents.
• additional additives such as anti-oxidants, dispersants, friction modifiers, viscosity index improvers, pour point depressants, corrosion inhibitors, defoammg agents and seal fix or seal compatibility agents.
• Antioxidants that may be conveniently used include those selected from the group of ammic antioxidants and/or phenolic antioxidants.
• said antioxidants are present m an amount in the range of from 0.1 to 5.0 wt . %, more preferably in an amount m the range of from 0.3 to 3.0 wt. %, and most preferably m an amount of m the range of from 0.5 to 1.5 wt . %, based on the total weight of the lubricating oil composition.
• ammic antioxidants which may be conveniently used include alkylated diphenylammes, phenyl- ⁇ -naphthylammes, phenyl- ⁇ -naphthylamines and alkylated ⁇ -naphthyla ⁇ unes.
• Preferred ammic antioxidants include dialkyldiphenylammes such as p,p' -dioctyl-diphenylamme, p, p ' -di- ⁇ -methylbenzyl-diphenylamme and N-p-butylphenyl- N-p ' -octylphenylamme, monoalkyldiphenylammes such as mono-t-butyldiphenylamme and mono-octyldiphenylamme, bis (dialkylphenyl) amines such as di-(2,4- diethylphenyl) amine and di (2-ethyl-4-nonylphenyl) amine, alkylphenyl-1-naphthylamines such as octylphenyl-1- naphthylamme and n-t-dodecylphenyl-1-naphthylamme, 1- naphth
• Preferred aminic antioxidants include those available under the following trade designations: "Sonoflex OD-3" (ex. Seiko Kagaku Co.), “Irganox L-57” (ex. Ciba Specialty Chemicals Co.) and phenothiazine (ex. Hodogaya Kagaku Co. ) .
• phenolic antioxidants which may be conveniently used include C7-C9 branched alkyl esters of 3, 5-bis (1, 1-dimethyl-ethyl) -4-hydroxy-benzenepropanoic acid, 2-t-butylphenol, 2-t-butyl-4-methylphenol, 2-t- butyl-5-methylphenol, 2, 4-di-t-butylphenol, 2, 4-dimethyl- 6-t-butylphenol, 2-t-butyl-4-methoxyphenol, 3-t-butyl-4- methoxyphenol, 2, 5-di-t-butylhydroquinone, 2, 6-di-t-butyl- 4-alkylphenols such as 2 , 6-di-t-butylphenol, 2,6-di-t- butyl-4-methylphenol and 2, 6-di-t-butyl-4-ethylphenol, 2, 6-di-t-butyl-4-alkoxyphenols such as 2, 6-di-t-butyl-4- methoxy
• Preferred phenolic antioxidants include those available under the following trade designations: "Irganox L-135" (ex. Ciba Specialty Chemicals Co.),
• the lubricating oil composition of the present invention may comprise mixtures of one or more phenolic antioxidants with one or more aminic antioxidants.
• the lubricating oil compositions of the present invention may additionally contain an ash-free dispersant which is preferably admixed m an amount m the range of from 5 to 15 wt . %, based on the total weight of the lubricating oil composition.
• Examples of ash-free dispersants which may be used include the polyalkenyl succmimides and polyalkenyl succininic acid esters disclosed in Japanese Laid-Open Patent Application Nos . JP 53-050291 A, JP 56-120679 A, JP 53-056610 A and JP 58-171488 A.
• Preferred dispersants include borated succmimides .
• Examples of viscosity index improver improvers which may conveniently be used m the lubricating oil composition of the present invention include the styrene- butadiene copolymers, styrene-isoprene stellate copolymers and the polymethacrylate copolymer and ethylene-propylene copolymers. Dispersant-viscosity index improvers may be used in the lubricating oil composition of the present invention.
• Such viscosity index improver improvers may be conveniently employed in an amount m the range of from 1 to 20 wt . %, based on the total weight of the lubricating oil composition.
• Polymethacrylates may be conveniently employed in the lubricating oil compositions of the present invention as effective pour point depressants.
• compounds such as alkenyl succinic acid or ester moieties thereof, benzot ⁇ azole-based compounds and thiodiazole-based compounds may be conveniently used m the lubricating oil composition of the present invention as corrosion inhibitors.
• Compounds such as polysiloxanes, dimethyl polycyclohexane and polyacrylates may be conveniently used m the lubricating oil composition of the present invention as defoaming agents.
• Compounds which may be conveniently used in the lubricating oil composition of the present invention as seal fix or seal compatibility agents include, for example, commercially available aromatic esters.
• the lubricating oil compositions of the present invention may be conveniently prepared by admixing the one or more anti-wear additives, one or more poly (hydroxycarboxylic acid) amide salt derivatives and, optionally, one or more detergents and further additives that are usually present m lubricating oil compositions, for example as herein before described, with mineral and/or synthetic base oil.
• the present invention further provides a method of reducing deposits in an internal combustion engine, which method comprises lubricating said internal combustion engine with a lubricating oil composition as hereinbefore described .
• the present invention also provides for the use of a lubricating oil composition as hereinbefore described in order to reduce deposits in an internal combustion engine.
• the present invention provides a method of suppressing internal combustion engine fouling and/or improving cleaning performance in the reduction of deposits such as sludge and varnish.
• the present invention further provides for the use of a lubricating oil composition as hereinbefore described m order to suppress internal combustion engine fouling and/or improve cleaning performance m the reduction of internal combustion engine deposits such as sludge and varnish.
• Tables 1 and 2 indicate the lubricating oil compositions that were tested.
• Poly (hydroxycarboxylic acid) amide salt derivatives according to the present invention that were used in testing were products available commercially from Lubrizol under the trade designation "SOLSPERSE 17000” (a reaction product of poly (12-hydroxystearic acid) with N, N-dimethyl-1, 3-propanediamine and dimethyl sulphate) and under the trade designation "CH-7" from Shanghai Sanzheng Polymer Company.
• SOLSPERSE 17000 a reaction product of poly (12-hydroxystearic acid) with N, N-dimethyl-1, 3-propanediamine and dimethyl sulphate
• SOLSPERSE 17000 product and “CH-7” product have TBN values of approximately 2.0 mg.KOH/g and 1.9 mg.KOH, respectively, as measured by ASTM D 4739. Furthermore, “SOLSPERSE 17000” product and “CH-7” product have sulphur contents of approximately 0.89 wt. % and 0.86 wt . %, respectively, as measured by ICP-AES.
• a comparative product was tested which was a poly (hydroxycarboxylic acid) derivative that is not according to the teaching of the present invention. Said comparative product is available from commercially from Lubrizol under the trade designation "SOLSPERSE 11200".
• Comparative Example 1 in Table 1 was a commercial engine oil which comprised API Group I base oil, pour point depressant, viscosity modifier, antifoam, a conventional additive package containing sulphonate and phenate detergents having TBNs in the range of from 30 to 350 mg.KOH/g, PIB succinimide dispersant and zinc dithiophosphate and diluent oil. Said formulation was also used as the basis for the formulations of Examples 2 and 3.
• Comparative Example 3 in Table 2 was a commercial engine oil which comprised base oil and zinc dithiophosphate anti-wear additive and conventional lubricant additives and is available from the Shell group under the trade designation "HELIX" engine oil. Said formulation was also used as the basis for the formulation of Example 4.
• Commercial engine oil comprising a conventional additive package containing sulphonate and phenate detergents having TBNs in the range of from 30 to 350 mg.KOH/g, PIB succinimide dispersant and zinc dithiophosphate and diluent oil.
• the "dirty-up" phase was conducted as per ASTM D6593, using a new VG engine and a "dirty-up" standard oil which was an API SF specification oil with the following modifications: a. Intermediate sludge ratings of the right side of the engine were carried out every 24 hours on the valve deck, cam cover and cam-baffle, b. Photographs were taken of each of these components every 24 hours. c. The test was run until one of the components had accumulated enough sludge and varnish to achieve a rating of approximately 7. The time taken to reach this rating ( ⁇ 7) was approximately 216 to 288 hours. 2. At the end of the "dirty-up" phase, the "dirty-up" standard oil was drained.
• the "dirty-up" standard oil was then replaced with the lubricating oil composition to be tested and the engine was ready to continue with the second part of the test. 3.
• the second part of the test, the "clean-up” phase was conducted in exactly the same manner as the "dirty-up” phase for the standard 216 hours. 24 hourly ratings and photographs were taken throughout the test.
• a bencb screener test was developed in order to demonstrate deposit control specifically in relation to the ability of a lubricant to "clean-up" real engine sludge rather than just “keep clean”.
• a cam-baffle was obtained from a VG engine after running the dirty-up phase of the modified Sequence VG test as described above.
• Cam-baffle samples were then suspended in the lubricating oil compositions to be tested (10Og). The lubricating oil compositions were then stirred and maintained at 8O 0 C for a period of up to 14 days .
• a rating of 10.0 means that the sample was completely clean with no sludge or varnish thereon.
• Example 1 The lubricating oil compositions of Example 1 and Comparative Examples 1 and 2 were screened using the bench test screener test.
• Figure 1 represents graphically the % increase in cleanliness ratings over the cleanliness ratings at 0 days for the results of Table 3.
• Figure 2 represents graphically the % increase in cleanliness ratings over the cleanliness ratings at 0 days for the results of Table 4.
• Example 4 The lubricating oil compositions of Example 4 and Comparative Example 3 were screened using the modified Sequence VG engine test as hereinbefore described. The cleanliness ratings are given in Table 5.
• Example 3 was a commercial engine oil available from the Shell group under the trade designation "HELIX” engine oil, whilst the lubricating oil composition of Example 4 was the same formulation boosted with 3.0 wt . % of "CH- 7" product.
• Figure 3 represents graphically the % increase in cleanliness ratings over the cleanliness ratings at 0 hours for the results of Table 5.

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