Boric Acid → Boric acid, calcium salt

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A solution or 323.2 g of a calcium carbonate overbased alkylsalicylate (TBN 205 mgKOH/g, calcium content; 8.5 wt. %) (the calcium content of this starting material being the same as the total calcium content of the starting materials (A) and (B) in Example 1 or in each of Comparative Examples 1 and 2) and 400 g of xylene were put in a 1000-ml four-necked flask fitted with a condenser and heated to 60° C. while agitating. To this mixture was added 43.4 g of orthoboric acid, and the resulting mixture was heated up to a refluxing temperature (66° C.) under agitation and reacted for 4 hours to obtain a reaction product. The reaction product was further heated to 140° C. for 1.5 hours to distill out the reaction water and xylene. Finally the reaction product was diluted twofold with hexane and filtered to remove any residual solids present, and the hexane was distilled out to obtain a calcium borate overbased alkylsalicylate.

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