Patent ID: 7435273

Claim:
An additive mixture for fuels or lubricants, containing at least one compound a formula I optionally in combination with one or more further fuel or lubricant additives, said formula I being (R a R b m R c n )B—(O—A) p —OH (I) where R a , R b and R c , independently of one another, are a polyalkenyl radical which has at least one tertiary or quaternary carbon atom, wherein the polyalkenyl radicals R a , R b and R c are derived from polyalkenes into which at least 70% by weight, based on the total amount of the alkenes incorporated, of isobutene have been incorporated and wherein the polyalkenes are at least monounsaturated and are terminated to an extent of at least 70 mol % with methylvinylidene groups (—C(—CH 3 )═CH 2 ) and/or dimethylvinyl groups (—CH═C(CH 3 ) 2 ), B is a benzene ring which may additionally carry 4—(m+n) substituents which differ from R b and R c and are selected from alkyl and alkoxy, A is C 2 - to C 8 -alkylene, wherein the alkylene oxide units —(O—A)— have identical or different alkylene groups A and wherein the alkylene oxide units are present in any desired sequence, m and n, independently of one another, are 0 or 1, p is an integer from 5 to 200 and the radical (R a R b m R c n )B— has a number average molecular weight of from 254 to 5000, which is obtained by a process comprising the steps of a) alkylating a phenol of the formula H—B—OH with at least one polyolefin the presence of an alkylation catalyst and either b1) alkoxylating the product obtained in (a) by reacting it with at least one compound which is selected from C 2 - to C 8 -alkylene oxides, cyclic ethers of 2 to 8 carbon atoms and mixtures thereof, or b2) etherifying the product obtained in (a) with a polyalkylene oxide of the formula H—(O—A) p —OH or a derivative thereof, and in which the step (a) is carried out at a temperature of from −10° C. to 50° C. and with a Lewis acid or a protic acid as alkylation catalyst.