Dialkyl-polyalkylamine compositions, process for their preparation and their use

FIELD: chemistry.SUBSTANCE: invention relates to a polyalkylamine composition, which is suitable for use in lubricating oils for machines, as demulsifiers for oil-in-water emulsions, a corrosion inhibitor, a fuel additive, a scaling agent, additives to asphalt, additives to lubricating-cooling liquid, antistatic or at intensification of oil extraction from oil wells. Composition contains a mixture of polyalkylamines selected from products of formulas (I) and (II). In formulas (I) and (II), each R, independently of the other R, represents an alkyl or alkenyl residue with 8-22 carbon atoms, n and z independently represent one of 0, 1, 2 or 3, and when z>0, then o and p independently represent one of 0, 1, 2 or 3, or their methylated and / or alkoxylated derivatives. Said mixture contains a) generally at least 3 wt% branched compounds of formula (I) with at least one of n and z>=1 and products of formula (II) with n>=1; and b) in general, at least 5 % by weight of products of formula (I) with n and z=0 and compounds of formula (II) with n=0. Composition has good technical characteristics combined with a favorable viscosity profile..EFFECT: invention also relates to methods for preparing such compositions and use thereof for said purpose.15 cl, 2 tbl, 6 ex