| 摘要 |
A detergent concentrate composition suitable for incorporation into a finished lubricating oil comprises:- (A) an additive concentrate comprising:- (a) a lubricating oil, and (b) a lubricating oil soluble sulphurised or non-sulphurised alkaline earth metal hydrocarbyl phenate modified by reaction to incorporate from greater than 2 to less than 40% by weight based on the weight of the concentrate (A) of either (i) at least one carboxylic acid having the formula:- <CHEM> wherein R is a C10 to C24 alkyl or alkenyl group and R<1> is either hydrogen, a C1 to C4 alkyl group or a -CH2-COOH group, or an anhydride or ester thereof, or (ii) a di- or polycarboxylic acid containing from 36 to 100 carbon atoms or an anhydride or ester thereof, the concentrate having a BN greater than 300 and a viscosity at 100 DEG C of less than 1000cSt, and (B) an additive concentrate comprising:- (a) a lubricating oil, and (b) a lubricating oil soluble sulphurised or nonsulphurised alkaline earth metal hydrocarbyl phenate, that has not been modified or has been modified by reaction to incorporate less than 0.1% by weight based on the weight of the concentrate (B) of either (i) or (ii), the concentrate preferably having a BN of less than 300. o |
