Patent GB-796732-A (GB)
Title: Improvements in or relating to lubricant compositions
IPC: C10M159/18
Filed: 1955-06-07
Abstract: Complexes, suitable for use as lubricating oil additions (see Group III) are formed between an acid, oxide or salt of molybdenum and a metal chelating agent having in the molecule two groups or atoms selected from the class consisting of hydroxyl, sulphhydryl, acyl, amino, amido, nitro, sulphato, carboxyl and esterified carboxyl groups and halogen atoms, the groups or atoms being attached to the same carbon atom or to carbon atoms which are adjacent to one another or next but one.  The metal chelating agents may be dithiols, diamines, mercapto alcohols, amino alcohols, amino thiols, dicarboxylic acids, hydroxycarboxylic acids, mercaptocarboxylic acids, aminocarboxylic acids, beta - diketones, beta - keto carboxylic acid esters, dimercapto benzenes, mercaptohydroxy benzenes, diamino benzenes, aminohydroxy benzenes, aminomercapto benzenes, hydroxycarboxy benzenes or mercaptocarboxy benzenes; examples of the various types are given.  They may carry additional substituents such as aromatic or substituted aromatic rings, hydroxy, alkoxy, aryloxy, sulphhydryl, alkyl thioether, aryl thioether, alkyl thioester, aryl thioester, acyl, aroyl, thioacyl, thioaroyl, amino, alkylamino, arylamino, acylamido, aroylamido, nitro or sulphato groups or halogen atoms.  The molybdenum-containing complexes, if acidic, may be used in the form of their esters (e.g. monobutyl esters or monopentaerythritol esters) or nitrogen base salts (e.g. salts of trimethylamine, triethanolamine, laurylamine, phenyl alpha - naphthylamine, phenylene diamine, aminophenol, pyridine or morpholine).  In an example molybdic acid is reacted with 4-tert.-butyl-catechol to produce 4-tert.-butyl-catechol molybdate. It is stated that ethylene glycol molybdate, 2-ethyl-1,3-hexane-diol molybdate and 2,3-butane-diol molybdate may similarly be prepared. In further examples: (a) ammonium molybdate is reacted with ethylene glycol, 2 - methyl - 2,4 - pentane - diol or 2 - ethyl - 1,3 - hexane-diol (b) ammoniacal molybdenum trioxide is reacted with 2-ethyl-1,3-hexane-diol, 2,3-butane-diol or oxalic acid; and (c) ammonium paramolybdate is reacted with glycollic acid.ALSO:Lubricating compositions, suitable for use in internal combustion engines, comprise a lubricating oil and 0.01-5 per cent by weight of a complex of an acid, oxide or salt of molybdenum with a metal chelating agent having in the molecule two groups or atoms selected from the class consisting of hydroxyl, sulphhydryl, acyl, amino, amido, nitro, sulphato, carboxyl and esterified carboxyl groups and halogen atoms, the groups or atoms being attached to the same carbon atom or to carbon atoms which are adjacent to one another or next but one.  The lubricating oil may be mineral or synthetic, and examples of synthetic oils are alkylene polymers, oils derived from coal or shale, alkylene oxide polymers and their ethers and esters, alkyl esters of dicarboxylic acids, di-n-hexyl fumarate polymer, alkyl benzenes, tricresyl phosphate, diethyl ester of decane phosphonic acid, polysiloxanes and silicate esters.  The metal chelating agents may be dithiols, diamines, mercapto alcohols, amino alcohols, amino thiols, dicarboxylic acids, hydroxycarboxylic acids, mercaptocarboxylic acids, aminocarboxylic acids, beta-diketones, beta-keto carboxylic acid esters, dimercapto benzenes, mercaptohydroxy benzenes, diamino benzenes, aminohydroxy benzenes, aminomercapto benzenes, hydroxy carboxy benzenes, aminocarboxy benzenes or mercaptocarboxy benzenes; examples of the various types are given.  They may carry additional substituents such as aromatic or substituted aromatic rings, hydroxy, alkoxy, aryloxy, sulphhydryl, alkyl thioether, aryl thioether, alkyl thioester, aryl thioester, acyl, aroyl, thioacyl, thioaroyl, amino, alkylamino, arylamino, acylamido, aroylamido, nitro or sulphato groups or halogen atoms. The molybdenum-containing complexes, if acidic, may be used in the form of their esters or nitrogen base salts.  The lubricating compositions may contain additional ingredients such as dispersants or detergents (e.g. alkaline earth metal petroleum sulphonates), oil-solubilizing agents (e.g. glycols or other polyhydric alcohols or their ethers), stabilizers (e.g. metal alkyl phenates), antioxidants (e.g. diarylamines, polyhydroxylbenzenes, hydroxy aromatic amines or phenothiazine), oiliness agents, viscosity index improvers, pour-point depressants, blooming agents and peptizing agents.  In the examples, mineral lubricating oil compositions are described containing ethylene glycol molybdate or its 2-ethylhexylamine salt, 2-ethyl-1,3-hexanediol molybdate or its 2-ethylhexylamine salt, 2 - methyl - 2,4 - pentane - diol molybdate, 2,3-butane-diol molybdate, oxalic acid molybdate, glycollic acid molybdate, 4-tert.-butyl-catechol molybdate or 2-methyl-1,3-pentane-diol molybdate.  In some of the compositions of the examples, additional ingredients are present, chosen from neutral and basic calcium petroleum sulphonates, calcium cetyl phenate and phenyl alpha-naphthylamine.