Abstract: A method for the preparation of olefin polysulfides that can be used in particular as extreme pressure additives for lubricants is described. This method comprises: (1) reacting sulfur monochloride or dichloride with at least one mono-olefin containing 2 to 5 carbon atoms (in general isobutene) resulting in the formation of an adduct; (2) bringing into contact said adduct, conjointly with a hydrocarbyl halide, with a sulfur compound (for example, alkaline sulfides, hydrosulfides or polysulfides) and, in most cases, elemental sulfur, in an aqueous or aqueous-alcoholic medium; (3) heating the mixture and, after it has settled into two phases, separating the organic phase containing the olefin polysulfide; and if necessary (4) treating the product obtained with a base.The olefin polysulfides obtained contain a high proportion of sulfur, have a satisfactory viscosity and are sufficiently soluble in mineral oils as well as synthetic oils to be used as extreme pressure additives in the formulation of gear oils.

Abstract: New superbasic detergent additives are manufactured in two steps. The first step comprises the reaction of a sulfonic acid with an excess of oxide or hydroxide of lithium or group II A metal. The second step consists of carbonating the oxide or hydroxide in excess. The manufacture is conducted in the presence of a polyalkenylsuccinimide-amine salt.

Abstract: There are disclosed lubricating compositions consisting of homogeneous mixtures of:a. from 50 to 99% by weight of at least one mineral or synthetic hydrocarbon oil of lubricating viscosity,B. from 1 to 50% by weight of at least one complex ester composition formed as between at least one polycarboxylic acid selected from dimeric and trimeric unsaturated fatty acids, optionally hydrogenated, at least one dihydroxyl compound selected from polyalkylene glycols and diols, and at least one monofunctional compound comprising at least one monocarboxylic acid or at least one monohydroxyl compound selected from monohydric alcohols or monohydric phenols and oxyalkylenated monohydric alcohols or monohydric phenols, with the condition that one at least of the mono- or dihydroxyl compounds comprises a compound with oxyalkylene groups, andC. from 0 to 40% by weight of at least one light ester.