A process for preparing very fluid overbased additives WITH HIGHER basicity and composition containing these additives.

摘要

This invention relates to a method of preparation of additives overbased other fluids and basicity high, by bringing into contact with a derivative of alkaline earth metal and of at least one surface-active agent with carbon dioxide in a diluent oil and a solvent hydrocarbon in the presence of a promoter oxygen and of a promoter nitrogen characterizes in that the time of the carbonation is between an initial point po corresponding to the start of the bearing of the temperature of the exothermic reaction and the stoppage of the carbonation, which corresponds to a sudden drop of the alkaline value. / p & & p & the additives according to the invention are used in the lubricating oils and oils.