Patent GB-729367-A (GB)
Title: Lubricating oil compositions
IPC: C10M169/00
Filed: 1953-03-23
Abstract: Halogenated esters, of fatty acids containing at least 8 carbon atoms, are phospho-sulphurized by treatment with a phosphorus sulphide such as P4S3, P2S5, P4S7 and PSCl3.  Esters specified are the partial and full esters of glycerol with stearic, oleic or palmitic acid, sorbitan monoor trioleate, pentaerythritol mono-oleate, esters of monohydric alcohols such as isopropyl stearate, isobutyl oleate and butyl stearate, polyoxyethylene sorbitan mono-oleate and natural fats and oils such as lard oil, wool fat, degras, castor oil, whale oil and sperm oil. Chlorinated esters are referred to.ALSO:A lubricating oil composition comprises a major proportion of a lubricating oil and minor proportions of (a) an oil-soluble polyvalent metal salt of an aromatic acidic compound having an -XH group attached to the aromatic nucleus, (b) an oil-soluble salt of an organic compound containing one or more SO3H groups, (c) an oil-soluble, metal-free amine, and (d) an oil-soluble compound obtained by introducing halogen and sulphur atoms or halogen, sulphur and phosphorus atoms into an ester of a fatty acid containing at least 8 carbon atoms.  X represents oxygen, sulphur, selenium or tellurium.  Additive (a) may be a metal salt of a bisphenol, sulphide or dissulphide, a metal phenate or theiophenolate, or a metal salt of an alkyl phenol-aldehyde condensation product.  The sulphonate may be a salt of sulphonic acids produced by sulphonating petroleum fractions or alkyl-substituted aromatic compounds; neutral and basic alkaline earth metal petrolum sulphonates are particularly mentioned.  Amines preferred are substituted or unsubstituted arylamines, for example, those with two aromatic rings; naphthylamines containing alkyl aryl or aralkyl radicals, phenanthyrl, anthryl or picyl phenyl amines, diamino diaryl alkanes, alkylated diaryl amines are mentioned. Additive (d) may be prepared by halogenating and then treating with a phosphorus sulphide or sulphohalide esters such as glycerol stearate, oleate or palmitate, sorbitan mono- or tri-oleate, pentaerythritol monoleate, isopropyl stearate, isobutyl oleate, butyl stearate, polyoxyethylene sorbitan mono-oleate and natural fats and oils such as lard oil, wool fat, degras, castor oil, whale oil and sperm oil. Many examples of the four types of additives are given.  The lubricating oil may be a hydrocarbon oil or a synthetic lubricating oil such as polymerized olefins, copolymers of alkylene glycols and alkylene oxides, polymeric tetrahydrofuran and organic esters such as di-(2-ethylhexyl) sebacate, dioctyl phthalate and trioctyl phosphate. The oils may be mixed with fatty oils such as castor oil or lard oil. Minor amounts of viscosity index improvers such as polyisolbutylene and polymeric esters, blooming agents, corrosion inhibitors, such as inorganic and organic nitrites, antioxidants and anti-wear agents such as organic phosphites, phosphates and phosphonates, for example dilauryl phosphate, tricresyl phosphate and butyl trichloromethane phosphonate and its amine salt may also be added.  U.S.A. Specification 2,158,680 is referred to.