Patent GB-1105729-A (GB)
Title: Metal salts of organic phosphorus acids
IPC: C10N30/06
Filed: 1966-05-31
Abstract: Metal salts of acids of the formula R2P(X)XH, where R represents hydrogen, a substantially hydrocarbon or hydrocarbon-oxy group which may contain up to about 200 carbon atoms, and X is oxygen or sulphur, at least one X being sulphur, are prepared by reacting the acids with a Group II metal base in the presence of a catalyst comprising a carboxylic acid containing up to 10 aliphatic carbon atoms or salts thereof with a metal selected from Group I, Group II, aluminium, iron, nickel, cobalt and copper. Phosphorus acids substituted by polyisobutene units (molecular weight 1000) are exemplified. The process may be applied to mixtures of such acids and also to a mixture of such an acid with a substantially hydrocarbon-substituted succinic acid having at least 50 aliphatic carbon atoms in the hydrocarbon substituent.  The hydrocarbon substituents is principally derived from high molecular weight petroleum fractions and olefin polymers, and interpolymers of the olefins, and in an Example, a polyisobutene (molecular weight 1000)-substituted-succinic anhydride is prepared by chlorinating the isobutene and reacting the product with maleic anhydride.ALSO:Lubricating oil compositions comprise a major proportion by weight of a lubricating oil and a minor proportion by weight of a metal salt of a phosphorus acid obtained by reacting a Group II metal base with a phosphorus acid of the formula (R)2P(X)(XH), where R is hydrocarbon or hydrocarbon-oxy, or one R may be H, and X is oxygen or sulphur, or a mixture of said phosphorus acid and a hydrocarbon-substituted succinic acid containing at least 50 aliphatic carbon atoms in the hydrocarbon substituent, in the presence of a catalyst selected from the class consisting of carboxylic acids having up to 10 aliphatic carbon atoms and salts thereof with a metal selected from Group I, Group II, aluminium, iron, nickel, cobalt and copper. The salts are extreme pressure agents and oxidation inhibiting agents.  Suitable lubricating oils are of synthetic, e.g. polyester, animal, vegetable or mineral origin and the compositions may contain other additives, e.g. detergents of the ash and non-ash type, viscosity index improving agents, pour-point depressing agents, anti-foam agents, auxiliary extreme pressure agents, rust-inhibiting agents and oxidation and corrosion-inhibiting agents (extensive lists being given).ALSO:Metal salts of phosphorus-containing acids are prepared by reacting a Group II metal base with a phosphorus acid of structural formula (R)2P(X)(XH), where R is hydrocarbon or hydrocarbonoxy or hydrogen, X is oxygen or sulphur, at least one X being sulphur, in the presence of a catalyst comprising a carboxylic acid having up to 10 aliphatic carbon atoms or a salt thereof with a metal selected from Group I, Group II, aluminium, iron, nickel, cobalt and copper.  The hydrocarbon radicals may contain up to 200 carbon atoms and may be an alkyl, aryl, alkenyl, aralkyl or cycloalkyl radical optionally substituted by one or more polar substituents.  The process may be applied to mixtures of phosphorus acids and to a mixture of a phosphorus acid and a hydrocarbon-substituted succinic acid containing at least 50 aliphatic carbon atoms in the hydrocarbon substituent.  The hydrocarbon substituent is usually a substantially saturated petroleum fraction or olefin polymer.  The reaction is suitably carried out in the presence of a diluent or solvent at a temperature between 25 DEG  C. and the decomposition point of the mixture, preferably between 50 DEG  and 200 DEG  C.  The metal salts are useful as extreme pressure agents and oxidation inhibitors in lubricants, and are also stated to be of use as insecticides, pesticides, ore-floatation agents and plasticizers.  The P-containing acids may be prepared by reacting four moles of an alcohol or phenol with one mole of phosphorus pentasulphide, or by reacting a hydrocarbon, e.g. an olefine with phosphorus pentasulphide and hydrolysing the mixture, or (as in one of the examples) by mixing a polyisobutene-substituted phenol, mineral oil and sulphur dichloride and then reacting the sulphurized phenol with phosphorus pentasulphide.