Process for making group II metal carbonated, overbased Mannich condensation products of alkylphenols

A process for preparing Group II metal carbonated, overbased Mannich condensation products of alkylphenols which comprises the steps of:

• (a) 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 overbased Mannich alkylphenol, and one or more promoters, and a Group II metal oxide, hydroxide C1-C6 alkoxide;
• and
• (b) contacting said reaction mixture with 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 R1 and R2 are independently hydrogen or alkyl containing one to three carbon atoms;
• and wherein the contacting 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 alkyphenol, wherein the promoter comprises a C2-C10 alkylene glycol, and a second promoter, which is different from the first promoter, comprises water, a C1-C5 mono- or di-alcohol, ethylene glycol or a mixture thereof, and wherein in step (b) the alkylene carbonate is added to the reaction mixture over a time period of about 15 minutes to about 120 minutes.

A process for preparing Group II metal carbonated, overbased Mannich condensation products of alkylphenols which comprises the steps of:

• (a) forming a first reaction mixture by combining 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 with an aldehyde and an amine, in the presence of an inert hydrocarbon diluent;
• (b) contacting said first reaction mixture with a second reaction mixture comprising a Group II metal oxide, hydroxide or C1-C6 alkoxide, and a promoter to form a third reaction mixture;
• and
• (c) contacting said third reaction mixture with 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 R1 and R2 are independently hydrogen or alkyl containing one to three carbon atoms;
• and wherein said contacting 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.