Patent GB-646292-A (GB)
Title: Extreme pressure lubricant
IPC: C08G65/02
Filed: 1947-08-27
Abstract: A liquid or gel lubricant comprises a polymer or copolymer or their derivatives, of one or more alkylene oxides and/or alkylene glycols and a minor amount of monomeric and/or polymeric linear thio-ethers consisting of dihydroxy thioethers, dihydroxy polysulphides, or adducts formed by the condensation of hydrogen sulphide or mercaptans with unsaturated ethers.  Specified alkylene oxides and glycols whose polymers and copolymers may be used are ethylene, propylene, 1,2-, 2,3- and iso-butylene, tetramethylene, n-hexylethylene, methylphenylethylene, cyclohexene, methyl-cyclohexene, and cetene oxides, epichlor- and epibromhydrins, glycidol, 1,2-epoxy-butanol - 2, and ethylene, propylene, trimethylene, hexamethylene, diethylene, triethylene and tetraethylene glycols.  Specified derivatives of these polymers and copolymers are esters, e.g. nitrates, phosphates, sulphates, formates, acetates, propionates, butyrates, laurates, stearates, myristates, palmitates and caprates; and ethers prepared by the use of methyl iodide or bromide, ethyl chloride, propyl iodide, benzyl chloride, methyl benzyl chloride, hydroxyethyl chloride, sodium monochloracetate or allyl chloride. Dihydroxy thioethers listed include bis-(hydroxy methyl) sulphide, bis-(a - or b -hydroxy ethyl) sulphide, bis-(a -, b -, or g -hydroxy propyl) sulphide and the corresponding ethyl, propyl, butyl, amyl, hexyl, lauryl, palmityl, stearyl or capryl compounds, and include mixed thioethers, e.g. hydroxymethyl - g  - hydroxypropyl, g -hydroxypropyl-b -hydroxyethyl and hydroxypropyl-hydroxyisopropyl sulphides.  Dihydroxy polysulphides specified are bis-(g -hydroxypropyl) disulphide, bis-(b -hydroxyethyl) disulphide and bis-(hydroxy methyl, ethyl, isopropyl, butyl or amyl) disulphides. The thioethers may also be polymers of the above compounds or monomers or polymers of adducts formed by condensation of hydrogen sulphide or mercaptans with unsaturated ethers, e.g. diallyl, divinyl, diisopropenyl, dimethallyl, dicrotyl, di - (butene - 1 - yl - 3), di - (butene - 2 - yl - 1), di - (pentene - 2 - yl - 4), dihexenyl ethers, allyl - (2 - methyl - pentene - 4 - yl - 2), allyl linalyl, hexachlorovinyl, di-(b -bromallyl) and di-(b ,g -di-iodoallyl) ethers.  These adducts may be made by irradiating the reactants with ultra-violet light or by heating with catalysts such as oxygen, air, ozone or organic peroxides, and may be esterified or etherified.  Antioxidants and anti-corrosion agents may be added to the lubricants, which may be mixed with soaps and/or animal oils to form greases.ALSO:A liquid or gel lubricant comprises a polymer or copolymer, or esters or ethers thereof, of one or more alkylene oxides and/or alkylene glycols and a minor amount of monomeric and/or polymeric linear thio-ethers consisting of dihydroxy thioethers, dihydroxy polysulphides or adducts formed by the condensation of hydrogen sulphide or mercaptans with unsaturated ethers (see Group IV (a)).  Antioxidants and anti-corrosion agents may be added to the lubricants, which may be mixed with soaps or animal oils to form greases.  Examples describe mixtures of a propylene oxide-ethylene oxide copolymer, and (1) 10 per cent of a diallyl ether-hydrogen sulphide adduct; (2) 3 per cent of bis-(g -hydroxypropyl) sulphide and bis-(g -hydroxypropyl)-disulphide monomer and polymer.