Preparation of polyisobutylenephenol containing mannich adducts useful as detergents in fuel compositions

摘要

A method for producing Mannich adducts that contain polyisobutylene phenol is disclosed wherein the method comprises: a) alkylating a phenol with highly-reactive polyisobutylene having a numerical average molecular weight of less than 1000 and with a polydispersivity of less than 3.0, at a temperature lower than 50 °C and in the presence of an alkylation catalyst; b) reacting the reaction product from a) with; b1) an aldehyde, selected among formaldehydes, an oligomer and a polymer of formaldehyde, and with; b2) at least one amine which has at least one primary or one secondary amino function. Mannich adducts that can be obtained by using this method, and that can be used as detergent additives in fuel compositions and lubricant compositions, and additive concentrates, fuel compositions and lubricant compositions containing these Mannich adducts are also disclosed.