Patent ID: 7256161

Claim:
A process for preparing Group II metal carbonated, overbased Mannich condensation products of alkylphenols which comprises: forming a reaction mixture by combining a Mannich condensation product of an alkylphenol wherein the alkyl group contains a sufficient number of carbon atoms to render oil-soluble the resulting Group II metal carbonated, overbased Mannich condensation products of alkylphenol, a Group II metal oxide, hydroxide or C 1 -C 6 alkoxide, one or more promoters, and an alkylene carbonate selected from ethylene carbonate or a mono-alkyl or di-alkyl substituted ethylene carbonate, said alkylene carbonate having the following structure: wherein R 1 and R 2 are independently hydrogen or alkyl containing one to three carbon atoms; and wherein the combining is carried out for a time and at a temperature sufficient to form in situ carbon dioxide and alkylene glycol, to form a product comprising a Group II metal carbonated, overbased Mannich condensation product of an alkylphenol, wherein the promoter comprises a C 2 -C 10 alkylene glycol, and a second promoter, which is different from the first promoter, comprises water, a C 1 -C 5 mono- or di-alcohol, ethylene glycol or a mixture thereof, and wherein the alkylene carbonate is added to the reaction mixture over a time period of about 15 minutes to about 120 minutes.