Burgess Ryan & Wayne
Method for preparing very fluid overbased additives having a high basicity and composition containing the additives
 This invention concerns a process for preparing very fluid overbased additives having a high basicity, by contacting an alkaline-earth metal derivative and at least one surfactant with carbon dioxide in a diluent oil and a hydrocarbon-based solvent in the presence of an oxygen-based promoter and a nitrogen-based promoter wherein the carbonation time is comprised between an initial point Po corresponding to the beginning of the temperature plateau of the exothermic reaction and the end point of the carbonation which corresponds to a sudden drop of the alkaline value, the additives according to the invention being utilized in lubricating oils and fuels. 
Elf France
C C
C10M C10M
inventional inventional
Paul Roger J. Simon Bernard Pierre
Maldonado Gallo Paley Damin Hoornaert