Patent GB-666064-A (GB)
Title: Improvements in hydrocarbon lubricating oil compositions
IPC: C10M137/10
Filed: 1948-02-05
Abstract: Zinc salts of acidic reaction products obtained by reacting phosphorus pentasulphide with alkylated cyclohexanols, in which the alkyl groups have less than six carbon atoms, are employed as additives in lubricating compositions (see Group III).  The acidic reaction products are believed to be mixtures of acid thiophosphate esters such as <FORM:0666064/IV (b)/1> where R is the cycloaliphatic radicle derived from the alcohol and R1 is hydrogen or R.  Alkylated cyclohexanols which may be employed in the preparation of the zinc salt include methyl cyclohexanol, ethyl cyclohexanol, propyl cyclohexanol, and amyl cyclohexanol.  Mixtures of alkylated cyclohexanols may also be employed, for instance (1) the crude methyl cyclohexanol obtained by the hydrogenation of commercial cresol and (2) a crude mixture of ethyl and propyl cyclohexanols.  The alkylated cyclohexanol may be reacted with P2S5 to give an acidic reaction product and this product either reacted with zinc oxide, or neutralized with caustic soda and then reacted with zinc chloride, to give the salt.  Alternatively alkylated cyclohexanol, P2S5 and ZnO may be reacted together simultaneously. Details are given of the preparation of the zinc salt of the acidic reaction product obtained by reacting P2S5 with methyl cyclohexanol.  Specification 567,939, [Group III], is referred to.  The Specification as open to inspection under Sect. 91 refers to the employment as additives in lubricating compositions of the zinc salts of acidic reaction products obtained by reacting P2S5 with cycloaliphatic alcohols.  Cycloaliphatic alcohols mentioned include cyclohexanol, cycloheptanol, cyclopentanol, methyl cycloheptanol, methyl cyclopentanol, borneol and sterols such as cosmol (which is derived from wool-fat).  This subject-matter does not appear in the Specification as accepted.ALSO:A lubricating composition, particularly A lubricating composition, particularly suitable for use in the crankcases of internal combustion engines, comprises a major proportion of a hydrocarbon oil and a minor proportion of the zinc salt of an acidic reaction product obtained by reacting phosphorus pentasulphide with an alkylated cyclohexanol in which the alkyl groups have less than six carbon atoms.  Alkylated cyclohexanols which may be employed in the preparation of the zinc salt include methyl cyclohexanol, ethyl cyclohexanol, propyl cyclohexanol and p  amyl cyclohexanol.  Mixtures of alkylated cyclohexanols may also be employed, for instance (1) the crude methyl cyclohexanol obtained by the hydrogenation of commercial cresol; and (2) a crude mixture of ethyl and propyl cyclohexanols. The alkylated cyclohexanol may be reacted with P2S5 to give an acidic reaction product and this product either reacted with zinc oxide or neutralized with caustic soda and then reacted with zinc chloride, to give the salt.  Alternatively, alkylated cyclohexanol, P2S5 and ZnO may be reacted together simultaneously.  The lubricating composition may also contain detergents, and a list of detergents of the organic metal compound type is given.  Mineral lubricating oil compositions are described which contain the zinc salt of the reaction product of P2S5 with methyl or amyl cyclohexanol.  Examples are given also of mineral lubricating oil compositions containing the zinc salt of the reaction product of P2S5 with methyl cyclohexanol and (a) calcium p-cetyl phenate and calcium cetyl phosphate; (b) aluminium n-butoxide and calcium cetyl phosphate; (c) calcium mahogany sulphonate and calcium phenate of p-t-amyl phenol monosulphide, calcium salt of formaldehyde-p-t-amyl phenol condensation product or aluminium-n-butoxide; (d) calcium salt of fatty acids from the oxidation of a petroleum oil fraction and calcium phenate of p-t-amyl phenol monosulphide; (e) calcium p-cetyl phenate; (f) calcium mahogany sulphonate; (g) magnesium phenate derived from lauryl salicylate; (h) calcium 10-phenyl stearate; or (i) cobaltous 10-(p-chlorphenyl) stearate. Specification 567,939 is referred to. The Specification as open to inspection under Sect. 91 refers to a lubricating composition comprising a major proportion of hydrocarbon oil and a minor proportion of a zinc salt of an acidic reaction product obtained by reacting P2S5 with a cycloaliphatic alcohol. Cycloaliphatic alcohols mentioned include cyclohexanol, cycloheptanol, cyclopentanol, methyl cycloheptanol, methyl cyclopentanol borneol and sterols such as cosmol (which is derived from woolfat).  This subject-matter does not appear in the Specification as accepted.