Patent ID: 7951760
Filing Date: 2011-05-31
Classification: C07G,C10M,C10N

Abstract:
1. A process for preparing an overbased alkali metal alkylhydroxybenzoate, said process comprising overbasing an alkali metal alkylhydroxybenzoate or a mixture of alkali 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 having from one to four carbon atoms 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 alkali metal alkylhydroxybenzoate having less than 3 volume % crude sediment in the absence of a filtration step.