Patent ID: 8030258

Claim:
A process for preparing an overbased alkaline earth metal alkylhydroxybenzoate, said process comprising overbasing an alkaline earth metal alkylhydroxybenzoate or a mixture of alkaline earth metal alkylhydroxybenzoate and up to 50 mole % of alkylphenol, based on the total mixture of alkylhydroxybenzoate and alkylphenol, with a molar excess of alkaline earth metal base and at least one acidic overbasing material in the presence of a mixture of carboxylic acids selected from C 1 to C 4 carboxylic acids and a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, monoalcohols, and mixtures thereof, and further wherein the process results in an overbased alkaline earth metal alkylhydroxybenzoate having less than 3 volume % crude sediment in the absence of a filtration step.