Patent ID: 6429178
Filing Date: 2002-08-06
Classification: C07G,C10M

Abstract:
A calcium overbased detergent formed by treating with an overbasing agent, a mixture containing at least one basic calcium compound and a surfactant system comprising at least two surfactants, at least one of the surfactants being a sulphurized or non-sulphurized phenol and at least one other of the surfactants being a sulphurized or non-sulphurized salicylic acid, the total proportion of the said phenol and the said salicylic acid in the surfactant system being at least 55 mass %, and the overbased detergent having a TBN: % surfactant ratio of at least 11, provided that, when the said ratio is less than 13, the said total proportion of the phenol and the salicylic acid is at least 65 mass %.