Patent ID: 7456136

Claim:
A linear compound comprising m units of formula (I) and n units of the formula (II) joined together, each end of the compound having a terminal unit which is independently hydrogen or one of the following formulae: wherein at least one of the terminal units is formula (III) or (IV); Y is a divalent bridging group which may be the same or different in each unit and that joins together the units of formulae (I)-(IV) and is (CHR 6 ) d in which R 6 is hydrogen and d is an integer which is at least 1; R 0 is hydrogen; R 5 is hydrogen or a hydrocarbyl group; j is 1 or 2; R 3 is a hydrocarbyl or a hetero-substituted hydrocarbyl group, where R 3 contains 1 to 100 carbon atoms; R 1 is hydroxyl and R 2 and R 4 are independently either hydrogen, hydrocarbyl or hetero-substituted hydrocarbyl, provided that at least one of R 1 , R 2 , R 3 and R 4 is hydrocarbyl containing on average at least 18 carbon atoms; wherein m is at least 1 and n is at least 2,; wherein on average the compound contains at least one unit of formula (I) or (III) and at least one unit of formula (II) or (IV); and the compound has a ratio of total number of units of formulae (I) and (III) to total number of units of formulae (II) and (IV) of about 0.1:1 to about 2:1; and the compound is either an alkali or an alkaline earth metal salt having a TBN of 60 to 500 mg KOH/g.