Patent ID: 6153565
Filing Date: 2000-11-28
Classification: C07G,C10M

Abstract:
A calcium overbased detergent comprising a surfactant system derived from at least two surfactants other than (a) an acid of the formula R.sup.a --CH(R.sup.b)--COOH, wherein R.sup.a represents an alkyl or alkenyl group containing 10 to 24 carbon atoms and R.sup.b represents hydrogen, an alkyl group with 1 to 4 carbon atoms, or a CH.sub.2 COOH group, or an acid anhydride, acid chloride or ester thereof, and (b) a di- or polycarboxylic acid containing from 36 to 100 carbon atoms or an acid anhydride, acid chloride or ester thereof, at least one of the surfactants being a sulphurized or non-sulphurized phenol or a derivative thereof and at least one other of the surfactants being a surfactant other then a phenol surfactant, the proportion of the said phenol in the surfactant system being at least 45 mass %, and the overbased detergent having a TBN: % surfactant ratio of at least 15.