| 摘要 |
The reaction product of (i) an oligomer having a number average molecular weight of no more than 7500 and being formed from one monomer or two or more different monomers, the or each monomer being an ethylenically unsaturated compound and said oligomer or each of said monomers being optionally partially or fully esterified, each of which monomers may not contain an ether moiety nor be a cyclopentadienyl group, said oligomer optionally being reacted with a low molecular weight amine, with (ii) a polyalkenyl derivative of an ethylenically unsaturated carboxylic reagent (iii), which derivative has a number average molecular weight of at least 1600 when the oligomer is a co-oligomer of two monomers one of which is a straight chain olefin, and (iv) a polyamine containing at least two -NH2 and/or -NH groups, or with (v) the pre-formed product of reagents (ii) and (iv), wherein at least one of the ethylenically unsaturated compounds of the oligomer has a functional group which can react with an amine, the oligomeric reaction product optionally being further reacted with a low molecular weight amines lubricant compositions, fuel compositions and additive concentrates containing them, and use of the reaction products as dispersant additives. |
