| abstract |
Process for the preparation of 2-alkyl-polyisobutenylphenols and their Mannich addition products, in which a) at least one 2-alkylhydroxyaromatic compound is brought into contact, which is selected from compounds of the general formula I ** Formula ** in which R1 represents C1-C20 alkyl and R2 represents hydrogen, C1-C20 alkyl, hydroxyl or C2-C4000 alkyl, which is interrupted by at least one grouping selected from O, S and NR3, in which case R3 represents hydrogen, alkyl, cycloalkyl or aryl, with a catalytically effective source of BF3, which is capable of complexing with the 2-alkylhydroxyl compound and is alkylated with polyisobutenes that are essentially ethylenically monounsaturated and are essentially homopolymeric and have a numerically average molecular weight Mn in the range from 200 to 500000 and contain at least 50 mol%, with respect to the total amount of polyisobutene macromolecules, of double bonds arranged ends They are primarily vinyl double bonds or vinylidene double bonds, the source of BF3 used in step a) being selected from BF3 complexes having at least one of the 2-alkylhydroxyaromatic complexes used in step a). |