Patent GB-845384-A (GB)
Title: Lubricating oil, compositions and additives therefor
Inventor: HUGHES JOHN
IPC: C08G73/02
Filed: 1958-05-19
Abstract: A lubricating oil composition (see Group III) comprises a salt of an oil-soluble polymeric amine (which is a copolymer containing basic nitrogen-containing groups and is obtained by copolymerizing a polymerizable heterocychic nitrogen base with a polymerizable unsaturated material free of heterocychic nitrogen-containing radicles) with an organic sulphonic acid.  The polymeric amines may be copolymers of a vinyl pyridine (e.g. 2-methyl-5-vinyl-pyridine or 5-ethyl 2-vinyl-pyridine) with one or more alkyl methocrylates, for example as described in Specifications 760,554, 818,254 and 845,384. The sulphonic acids from which the salts may be derived may be benzene or alkyl benzene sulphonic acids, naphthalene or alkyl naphthalene sulphonic acids, naphthol sulphonic acids, alkyl sulphonic acids or petroleum sulphonic acids.  The sulphonate salt may be prepared by reacting the polymeric amine with the sulphonic acid, if desired in the presence of a solvent such as benzene or xylene. In the examples, the preparation is described of (a) the p-toluene sulphonic acid salt of the copolymer of 2-methyl-5-vinyl pyridine with stearly and lauryl (and optionally methyl) methacrylates and (b) the salt of stearyl methacrylate/lauryl methacrylate/2-methyl-5-vinyl pyridine copolymer with naphthasulphonic acid or sulphonated Edeleanu extract of kerosine.ALSO:A composition suitable for lubricating engines over a wide temperature range comprises a lubricating oil and 0.1-20% by weight of a salt of an oil-soluble polymeric amine (which is a copolymer containing basic nitrogen-containing groups and is obtained by copolymerizing a polymerizable heterocyclic nitrogen base with a polymerizable unsaturated material free of heterocyclic nitrogen-containing radicles) with an organic sulphonic acid.  The salt may be partially or completely dissociated, so that the oil composition may comprise a mere mixture of the amine and the acid; furthermore the sulphonate salt may contain some un-neutralised basic nitrogen atoms.  The polymeric amines may be copolymers of a vinyl pyridine (e.g. 2-methyl5-vinyl pyridine or 5-ethyl-2-vinyl pyridine) with one or more alkyl methacrylates, for example as described in Specifications 760,554, 818,254 and 845,135.  The sulphonic acids from which the salts may be derived may be benzene or alkyl benzene sulphonic acids, naphthalene or alkyl naphthalene sulphonic acids naphthol sulphonic acids, alkyl sulphonic acids or petroleum sulphonic acids.  The lubricating oil may be a mineral and/or a synthetic oil and may be blended with fatty oils. Synthetic oils mentioned are polymerized olefines, copolymers of alkylene glycols and alkylene oxides, tetrahydrofuran polymers, silicones and esters such as di(2-ethylhexyl) sebacate, dioctyl phthalate and trioctyl phosphate.  The composition may also contain pour point depressants, V.1. improvers, blooming agents, corrosion inhibitors, oiliness agents and solubilizers. Additional ingredients specified are polyalkyl methacrylates, isobutylene polymers, alkyl styrene polymers, metal or amine nitrites, organic phosphites, phosphates and phosphonates (including trichloroethyl phosphite), phosphorus sulphide/olefine reaction products (including P2S5 - treated terpenes), metal organic phosphates or thiophosphates, organic sulphides, amines, aliphatic alcohols, fatty acids, sorbitan mono-oleate, aliphatic dithiocarbonates of divalent Group II metals and calcium or barium naphthasulphonates.  In the examples, mineral lubricating oil compositions are described containing (a) the p-toluene sulphonic acid salt of the copolymer of 2-methyl-5-vinyl pyridine with stearyl and lauryl (and optionally methyl) methacrylates or (b) the salt of stearyl methacrylate/lauryl methacrylate/2-methyl-5-vinyl pyridine copolymer with naphthasulphonic acid or sulphonated Edeleanu extract of kerosine.