Abstract: A corrosion inhibitor, particularly suitable for use in pipelines used for the transportation of hydrocarbon fluids such as crude petroleum or refined petroleum fractions, comprises a mixture of (a) from 1.8 to 25 parts by weight dimerised unsaturated fatty acid and (b) 1 part by weight of an alkoxylated alkyl phenol and provides a WSIM number (as defined) of at least 60.

Abstract: New compounds are derived from intra-molecular and inter-molecular, in the case of a polymer, sulphur bridged hydrocarbon rings containing from 6 to 12 carbon atoms. The hydrocarbon ring is preferably 1,5-cyclooctadiene. The compounds also contain the residue of an alkyl, alkenyl or aralkyl xanthate and may also contain the residue of a further nucleophilic group. The new compounds are useful in lubricating oil compositions. The compositions may also contain other conventional lubricant additives.

Abstract: A process for the preparation of a sulphur compound suitable for use as a lubricant additive comprises reacting a trithiolan compound with a thiol compound in the presence of a base.

Abstract: New compounds are derived from intra-molecular and inter-molecular, in the case of a polymer, sulphur bridged hydrocarbon rings of 12 carbon atoms. The hydrocarbon ring is preferably 1,5,9-cyclododecatriene. The compound also contains the residue of a dithiophosphoric acid containing two organic moieties. The new compounds are useful in major or minor amounts in lubricating oil compositions. The lubricating oil may be a hydraulic oil. The composition may also contain other conventional lubricant additives.

Abstract: A heterocyclic phosphorus mono-, di- or polyester has the constitution of the product prepared by reacting an intermediate of specified type with a di- or polyol or derivative thereof capable of yielding the di- or polyol on hydrolysis, said intermediate of specified type being a heterocyclic phosphorus compound having the constitution of the compound prepared by reacting an olefin polymer or copolymer having at least 50 carbon atoms and containing olefinic unsaturation with a phosphorus trihalide in the presence of a Friedel-Crafts catalyst, preferably consisting of an aluminium halide, to form a reaction product having halogen atoms attached to phosphorus, and thereafter reacting the reaction product with a hydroxy compound, preferably water or methanol, to remove one or both of the halogen atoms attached to the phosphorus atom. Lubricating compositions containing the mono-, di- or polyesters of the invention are also described.

Abstract: Novel compounds which are amides of bis(phenol substituted)carboxylic acids, or derivatives thereof are described by specified general formula and as reaction products of at least one bis(phenol substituted)carboxylic acid, or derivative thereof, having at least one alkyl substituent of at least 30 carbon atoms on a phenol substituent, and at least one aliphatic, cycloaliphatic or heterocyclic primary or secondary di- or polyamine or a hydroxy alkyl amine.Also described are lubricating compositions containing the novel compounds of the invention.

Abstract: Novel compounds, useful as intermediates in the preparation of lubricant additives, are described by specified general formulae and as condensation products of (i) an alkyl-substituted monohydric phenol, phenol sulphide or alkylene bis-phenol in which the alkyl substituent contains at least 8 carbon atoms and (ii) a carbonyl-substituted compound selected from the group consisting of glyoxylic acid, pyruvic acid, levulinic acid, 3-oxoglutaric acid, 2-oxoglutaric acid and esters of such acids.