Patent GB-555053-A (GB)
Title: Viscous mineral oil compositions
Filed: 1941-04-23
Abstract: 555,053. Viscous mineral oil compositions. SOCONY-VACUUM OIL CO., Inc. April 23, 1941, Nos. 5267 and 5268. Convention dates, March 8. 1940, and April 10, 1940. [Class 91] [Also in Group IV] Viscous mineral oil compositions, such as lubricating oil compositions, comprise a viscous mineral oil with a minor proportion of an added compound of the type comprising at least two aryl nuclei, each substituted with a wax group, i.e. an aliphatic hydrocarbon group of at least 20 carbon atoms, and with a metal or metallo group, the nuclei being interconnected by at least one atom of an element of the group consisting of sulphur, selenium and tellurium. The compounds fall within the general formula :- where T represents an aromatic nucleus ; R the wax group, such as petroleum wax; ZM at least one metal-containing complex; # an element from the group sulphur, selenium, and tellurium ; n is 1 to 4; and Y represents hydrogen or an organic group selected from a large number of specified organic radicals, such as hydroxyl, xanthate, oxime, amide, aryl, halogen, amine, and diazo. The substitutional ZM containing the metal may be selected from another large group of specified organic radicals, such as (-OM); H (-SM); (-OOOM); (-SO 3 M); (-N< ); and M (-C(NH).OM). Any metals of groups I to VIII of the periodic system may be used, sodium, calcium, barium, lead, zinc, tin, aluminium, chromium, cobalt, nickel, and molybdenum being emphasized. The compounds correspond to the sulphur, selenium, or tellurium derivatives of the wax-aryl metallo compounds comprising the lubricating oil additives of Specification 532,876. Polymers of the compounds may be used. A table of structural formulae of 20 types of compounds falling within the general formula above is given, and full details of the preparation of compounds of each of these types is included. The compounds may be prepared by reacting the corresponding wax-alkylated aryl compound. with a sulphur halide to form the sulphur derivative, removing the HCl formed, and then introducing the metal into the complex by reacting the sulphur derivative with an alkali metal, either in solution as the element or as the alcoholate, the corresponding derivative of the desired metal being then obtained by double decomposition with an alcohol solution of an alcohol-soluble salt of the desired metal. The preparation of the starting wax-aklkylated, aryl compound is fully described in Specification 532,876. One of the types of compounds specified comprises additive compounds of inorganic metal salts with sulphides of wax-aromatic compounds and these may be prepared by reaction of sulphides of wax-aromatic compounds with metal halides such as SnCl 4 , HgCl 2 , and AS 2 Cl 3 . A second table of actual compounds which have been prepared and tested is given and the following are examples therefrom:-cobaltous phenate of wax-phenol disulphide, stannous salt of wax-amino phenol sulphide, stannous phenate-stannous-earboxylate of wax-phenolic acid monosulphide. stannous carboxylate of waxphenolic-acid tetrasulphide, stannous-carboxylate of ethanol xanthate of wax phenolic acid disulphide, stannous-carboxylate of waxphenoxy acetic-acid disulphide, and stannous salt of wax-aniline sulphide. The compounds may be used in viscous mineral oils in amounts ranging from <SP>1</SP>/ 16  per cent. to 10 per cent. of the weight of the oil. Specifications 398,222, 423,441, 455,235, 495,869, 498,046, and 547,972 also are referred to.