Patent GB-717933-A (GB)
Title: Improvements in or relating to lubricating compositions
Filed: 1951-11-22
Abstract: A lubricating oil concentrate comprises a lubricating oil, a copolymer of an aliphatic isoolefin having 4-7 carbon atoms and an aliphatic conjugated diolefin having 4-8 carbon atoms, and the reaction product of a metal salt of an alkyl phenol sulphide with phosphorus and sulphur or with a phosphorus sulphide.  The copolymer is preferably one which has been reduced in molecular weight from 40,000-250,000 to 10,000-30,000 Staudinger.  The isoolefin specified is isobutylene, and diolefins referred to are butadiene, isoprene and dimethyl butadiene.  The copolymer may be prepared by subjecting the mixture of isoolefin and diolefin to temperatures below 0 DEG C. in the presence of a catalyst such as aluminium chloride dissolved in a lower alkyl halide.  The degradation of the copolymer may be effected in a conventional manner, for example by milling in the presence of an aryl mercaptan or by extrusion through an orifice, and may be carried out in an oil solution in an inert atmosphere such as nitrogen. Metal salts referred to are salts of calcium, barium, strontium, magnesium, zinc, tin, lead, aluminium, cobalt and nickel; particular compounds specified are the barium salt of diisobutyl phenol sulphide, calcium tert.-octyl phenol sulphide, barium 2,4-di-tert.-amyl phenol sulphide, cobalt tert.-amyl phenol sulphide, the barium salt of 2-hydroxy-3,5-di-tert.-amyl-4-diethylamino diphenyl sulphide, the zinc salt of salicylic acid sulphide octyl ester, barium 2-stearoyl-4-amyl phenol sulphide, mixed calcium-barium tert.-octyl phenol sulphide, the tin salt of C16-C20 branched chain alkyl phenol sulphide, the barium salt of bis (2,4-diamyl phenol)-4 amyl-phenol dithioether, and polyvalent metal salts containing mixed acid radicals, for example the calcium mixed salt of tert.-amyl phenol sulphide and iso-octyl salicylic acid, the aluminium mixed salt of tert.-octyl phenol sulphide and stearic acid, the tin mixed salt of di-tert.-amyl phenol sulphide and naphthenic acids, the barium mixed salt of tert.-octyl phenol sulphide and petroleum mahogany sulphonic acids, the nickel mixed salt of tert.-amyl phenol sulphide and amyl xanthic acid, the zinc mixed salt of isododecyl phenol sulphide and methyl cyclohexyl thiophosphoric acid, the nickel mixed salt of tert.-amyl phenol sulphide and oleic acid and the magnesium mixed salt of tert.-octyl phenol sulphide and cetyl phenol. Phosphorus sulphides which may be reacted with these metal salts are P2 S5, P4 S3 an P4 S7.  Lubricating oils specified are natural or synthetic oils such as mineral oils, for example refined or extracted oils, oils produced by the polymerization of olefins, the reaction of oxides of carbon with hydrogen, or the hydrogenation of coal, and complex synthetic esters, ether or ether esters.  The compositions of the invention are compared with mineral oil compositions containing di-tert.-butyl-p-cresol, 2-tert.-butyl-4-methoxyphenol or polybutene. Specifications 565,974, 590,192 and 598,767, and U.S.A. Specification 2,239,501 are referred to.ALSO:The barium salt of bis-(2,4-diamylphenol)-4-amyl-phenol dithioether is prepared from 2 mols. of 2,4-di-tert.-amyl phenol and 1 mol. of p-tert.-amyl phenol, sulphurized with sulphur chloride and neutralized with barium hydroxide.  Specification 598,767 is referred to.ALSO:A lubricating oil concentrate comprises a lubricating oil, a copolymer of an aliphatic isoolefin having 4-7 carbon atoms and an aliphatic conjugated diolefin having 4-8 carbon atoms, and the reaction product of a metal salt of an alkyl phenol sulphide with phosphorus and sulphur or with a phosphorus sulphide.  The copolymer is preferably one which has been reduced in molecular weight from 40,000-250,000 to 10,000-30,000 Staudinger.  The iso-olefin specified is iso-butylene, and diolefins referred to are butadiene, isoprene and dimethyl butadiene.  Metal salts referred to are salts of calcium, barium, strontium, magnesium, zinc, tin, lead, aluminium, cobalt and nickel; particular compounds specified are the barium salt of diisobutyl phenol sulphide, calcium tert.-octyl phenol sulphide, barium 2, 4-di-tert.-amyl phenol sulphide, cobalt tert.-amyl phenol sulphide, the barium salt of 2-hydroxy-3, 5-di-tert.-amyl-4-diethylamino diphenyl sulphide, the zinc salt of salicylic acid sulphide octyl ester, barium 2-stearoyl-4-amyl phenol sulphide, mixed calcium-barium tert.-octyl phenol sulphide, the tin salt of C16-C20 branched chain alkyl phenol sulphide, the barium salt of bis (2, 4-diamyl phenol)-4-amylphenol dithioether, and polyvalent metal salts containing mixed acid radicals, for example the calcium mixed salt of tert.-amyl phenol sulphide and iso-octyl salicylic acid, the aluminium mixed salt of tert.-octyl phenol sulphide and stearic acid, the tin mixed salt of di-tert.-amylphenol sulphide and naphthenic acids, the barium mixed salt of tert.-octyl phenol sulphide and petroleum mahogany sulphonic acids, the nickel mixed salt of tert.-amyl phenol sulphide and amyl xanthic acid, the zinc mixed salt of isododecyl phenol sulphide and methyl cyclohexyl thiophosphoric acid, the nickel mixed salt of tert.-amyl phenol sulphide and oleic acid and the magnesium mixed salt of tert.-octyl phenol sulphide and cetyl phenol.  Phosphorus sulphides which may be reacted with these metal salts are P2S5, P4S3 and P4S7. Lubricating oils specified are natural or synthetic oils such as mineral oils, for example refined or extracted oils, oils produced by the polymerization of olefins, the reaction of oxides of carbon with hydrogen, or the hydrogenation of coal, and complex synthetic esters, ethers, or ether esters.  The compositions of the invention are compared with mineral oil compositions containing di-tert.-butyl-p-cresol, 2-tert.-butyl-4-methoxyphenol or polybutene.  Specifications 565,974, 590,192, [both in Group IV], and 598,767, and U.S.A. Specification 2,239,501 are referred to.