Abstract: A petroleum additive having excellent storage stability and heat stability, which comprises an alkaline earth metal salt of aromatic hydroxycarboxylic acid containing a higher aliphatic carboxylic acid, a higher aliphatic amine or a higher aliphatic amide, or a sulfurized mixture thereof. A process for improving storage stability, heat stability and viscosity character of the petroleum additive.

Abstract: A process for the production of an over based alkaline earth metal phenate (sulfurized, unsulfurized or a mixture thereof), in which the process comprises the steps of: effecting reactions among phenols, dihydric alcohols and an alkaline earth metal reagent (alkaline earth metal oxide or hydroxide or a mixture thereof), or among these compounds further mixed with sulfur and/or water; removing an excess of the dihydric alcohols and at least an excess of water by distillation; and subsequently treating resulting distillation residue with carbon dioxide, wherein the improvement resides in that the carbon dioxide treatment is carried out in the presence of water in an amount of from 0.01 to 1.0 mol per 1 mol of the alkaline earth metal reagent. Preferably, the carbon dioxide treatment is carried out in the presence of 0.1 to 0.7 mol sulfur and 0.1 to 1.0 mol water per 1 mol of the alkaline earth metal reagent.