| abstract |
As a lubricating oil additive effective to lubricate mechanical parts of land and marine engines such as hydraulic devices, transmissions, two-stroke and four-stroke vehicle engines, trunk pistons and two-stroke crosshead marine engines. A medium to high overbased detergent dispersant is provided. An alkali metal alkyl hydroxybenzoate or a mixture of an alkali metal alkyl hydroxybenzoate and 50 mol% or less alkylphenol based on the total mixture of alkylhydroxybenzoate and alkylphenol, a molar excess of alkaline earth metal base and at least one And at least one carboxylic acid having 1 to 4 carbon atoms and a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, monoalcohols, and mixtures thereof. A process for producing an overbased alkali metal alkylhydroxybenzoate comprising overbasing in the presence. [Selection figure] None |