Abstract: The reaction of a boron compound (e.g., boric acid) with an alkylphenoxy alkanoic acid amide (polyisobutylphenoxyacetamide of tetraethylenepentamine) forms a boronated product useful as a lubricating oil dispersant having improved properties.

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.