Sulfurized and via alkalized alkaline earth metals, salicylates, - alkylphenates - alkylphenates detergent - dispersant additives for lubricant oils

摘要

Dispersant detergent additives for lubricating oils prepared by neutralization, carboxylation, sulfurization-overalkalinization, carbonatation, distillation, filtering and degassing from alkyl phenols containing 35-85 % by weight of liner alkyl substituents. The process does not require during the neutralizing phase the presence of a third solvent, which, by forming an azeotropic mixture with water, promotes the elimination of water arising from the neutralizing reaction. The additives of the invention have improved stability to hydrolysis and improved dispersion properties, improved compatability and improved foaming properties.