Patent GB-475787-A (GB)
Title: Improvements in and relating to lubricants
IPC: C10M137/04
Filed: 1936-02-21
Abstract: Phosphorus esters containing an alkylated aryl group having eight or more carbon atoms may be prepared from phosphorus acids and halogenated phenols, or the esters may be after-halogenated. Esters may also be prepared from thiophenols and phosphorus oxychloride or thiophosphoryl chloride, from phenols and thiophosphoryl chloride, or the esters may be sulphurized.  The Specification as open to inspection under Sect. 91 refers to other esters, including tri-(p-chlorbenzyl)-, tri(trichlorphenyl)-, tri(b -chlorethyl)- phosphates-, triphenyl-, tricresyl-, tri-(o-tolyl)-, tri(m-tolyl)-, tri(p-tolyl)- monothiophosphates, triphenyl trithiophosphate, triphenyl tetrathiophosphate, prepared as above.  This subject-matter does not appear in the Specification as accepted.  Reference has been directed by the Comptroller to Specifications 448,424, 454,215, and 454,552.ALSO:The film strength of a petroleum oil or a hydrocarbon grease is increased by dissolving therein a small amount, e.g. 0,2 to 2 per cent, of one or more phosphorus esters containing an alkylated aryl group having eight or more carbon atoms.  The esters may be prepared from phosphorus acids and halogenated phenols or the esters as such may be halogenated; they may be prepared from thiophenols and phosphorus oxychloride or thiophosphoryl chloride, from phenols and thiophosphoryl chloride, or the esters as such may be sulphurized. Specified esters are tri(p-ethylphenyl) phosphate, tri(p-tertiary-butylphenyl) phosphate, and tri-xylenyl phosphates. The petroleum oil may be slightly or highly refined by solvents, e.g. b b <1>-dichlordiethylether, phenol or cresol, or by sulphuric acid; may be hydrogenated; or may be prepared synthetically from unsaturated petroleum derivatives.  In an example, 1 per cent of tri-p-ethylphenyl phosphate is added to an SAE30 petroleum oil. Specification 454,215 is referred to.  The Specification as open to inspection under Sect. 91 comprises also the addition to hydrocarbon oils in general of "various compounds of phosphorus such as the esters of phosphoric and thiophosphoric acids and their derivatives"; suitable esters are stated to be (a) triphenyl phosphate; (b) phosphates of polynuclear phenols such as a - and b -naphthol and their homologues, e.g. tri(4-isopropyl-a -naphthyl)phosphate, o- and p-hydroxy-diphenyl and their homologues; (c) phosphates of aliphatic alcohols, e.g. trimethyl-, triethyl-, and trioctadecyl-phosphates and mixtures of these and similar compounds; (d) phosphates of aryl carbinols, e.g. tribenzyl- and tri(phenyl-ethyl)-phosphate; (e) phosphates of hydroaromatic alcohols, e.g. tricyclohexyl- and tri(cyclohexylcarbinol)-phosphate; (f) the foregoing groups prepared from halogenated alcohols or phenols or afterhalogenated, e.g. tri(p-chlorbenzyl)-, tri-(trichlorphenyl)-, and tri(b -chlorethyl)-phosphate; (g) the foregoing classes prepared from alcohols or phenols and thiophosphoryl chloride or from thioalcohols or thiophenols and phosphorus oxychloride or thiophosphoryl chloride, e.g. triphenyl-, tri(o-tolyl)-, tri(m-tolyl)-, or tri(p-tolyl)- monothiophosphate, triphenyl, trithiophosphate, and triphenyl tetrathiophosphate; (h) tricresyl phosphate.  In examples, 1 per cent of triphenyl-, tri-b -napthyl-, triethyl-, tribenzyl-, tricyclohexyl-, tri(trichlorphenyl)-phosphate or tricresylmonothiophosphate is added to an SAE30 petroleum oil.  This subject-matter does not appear in the Specification as accepted. Reference has been directed by the Comptroller to Specifications 448,424, 454,215, and 454,552.