Patent ID: 8016898

Claim:
A process for the preparation of polyisobutenylphenol-containing Mannich adducts, comprising: a) alkylating a phenol with a highly reactive polyisobutene having a vinylidene double bond content of more than 70 mol %, a number average molecular weight of less than 900, and a polydispersity of less than 3.0 at below about 50° C., wherein the alkylating is carried out in the presence of an alkylation catalyst to form a reaction product; and b) reacting the reaction product from a) with b1) at least one aldehyde selected from the group consisting of formaldehyde, an oligomer of formaldehyde and a polymer of formaldehyde, and b2) at least one amine of the formula NHR 4 R 5 where R 4 and R 5 are C 1 - to C 20 alkyl radicals.