Abstract:
Metal sulfonates of the formula R--SO.sub.3 M wherein R is hydrocarbyl and M is a Group I or Group II metal or lead are overbased with Group II metal carbonate, bicarbonate, oxide or hydroxide. Also provided are lubricating oil compositions or concentrates containing these overbased sulfonates.
Abstract:
A process is disclosed for preparing overbased carbonated sulfurized magnesium alkylphenates. In the process, magnesium methoxide is carbonated and then contacted with an alkylphenol to form a normal magnesium phenate. The normal magnesium phenate is sulfurized and then contacted with an additional amount of carbonated magnesium methoxide to form the overbased sulfurized magnesium phenate.