Patent GB-707157-A (GB)
Title: Improvements in or relating to lubricating compositions
IPC: C10M169/00
Filed: 1951-06-04
Abstract: Examples are given of the preparation of the metal salts of aliphatic substituted diphenyl ether sulphonic acid sulphides and polysulphides, wherein each diphenyl ether group contains at least 6 aliphatic carbon atoms.  The salts are of the formula <FORM:0707157/IV (b)/1> where Q1 and Q are aliphatic groups, a is 1 to 4, such that each diphenyl ether group contains at least 6 and preferably more than an average of 22 aliphatic carbon atoms, n is 1 to 6 and X is a metal equivalent of hydrogen.  In the preparation of typical compounds, diphenyl ether may be treated with chlorinated or dehydrogenated paraffin wax, methyl-amyl alcohol or capryl alcohol in the presence of a catalyst to give an aliphatic substituted diphenyl ether, which is then treated with chlorosulphonic acid.  The product may then be treated with S2Cl2 to give the disulphide of the substituted diphenyl ether sulphonic acid.  The sulphonic acid is then neutralized in the presence of methyl alcohol as catalyst to give a metal salt such as the sodium, calcium, barium, cobalt, copper, iron or lead salt.  The mono-sulphides may be prepared by replacing the S2Cl2 by SCl2.  The polysulphides may be prepared by treating the corresponding disulphides with elemental sulphur or with sodium polysulphides, and in this manner the sulphur bridge may be increased to up to 6 sulphur atoms.  The preparation of calcium dicetyl diphenyl ether disulphide sulphonate is also described.  The products are useful as constituents of lubricating-oil compositions (see Group III). Specifications 555,053, 567,939, [Group III], and 693,421 are referred to.ALSO:A lubricating composition comprises a major proportion of a mineral oil and a minor proportion of a metal salt of an aliphatic substituted diphenyl ether sulphonic acid sulphide or polysulphide containing at least 6 aliphatic carbon atoms per diphenyl ether group.  These compounds are of the type <FORM:0707157/III/1> where Q1 and Q are aliphatic groups such that each diphenyl ether group contains at least 6 and preferably more than an average of 22 aliphatic carbon atoms, a is 1 to 4, n is 1 to 6 and X is a metal equivalent of hydrogen.  The metal may be sodium, an alkali earth metal such as calcium or barium, cobalt, copper, iron or lead.  The aliphatic substituent may be wax, methyl-amyl, capryl or cetyl and more than one such group may be introduced per diphenyl ether group.  The preparation of the additives is described (see Group IV (b)).  Amounts of the additives from 0.5 to 10 per cent. by weight of the oil may be used.  The lubricating composition may also contain minor proportions, e.g. 0.1 to 3 per cent. by weight of the total composition, of additional inhibitors such as polyvalent metal salts of the reaction product of P2S5 with an alcohol in a molar ratio of 1:4 to 1:5. Suitable alcohols for this purpose include methylcyclohexanol, n-propyl cyclohexanol and amyl-cyclohexanol, and the metal may be barium, zinc, calcium, magnesium or copper.  Another suitable additional inhibitor is the reaction product of 4 mols. of turpentine with 1 mol. of P2S5 at a temperature above 100 DEG C. Other additional inhibitors specified include capryl-alpha-naphthol, phenylethyl-beta-naphthol, capryl resorcinol, tributyl phosphite, lithium di(capryl cyclohexyl)dithiophosphate, zinc di(methyl cyclohexyl)dithiophosphate, and P2S5 treated di-iso-octyl naphthenate.  Specifications 555,053, [Group IV], 567,939 and 693,421 are referred to.