Aminoalkylation of aromatic polymers using aldehyde, diacylamine and strong acid catalyst

Abstract

A cross-linked polymer of a monovinylidene aromatic compound is diacylaminoalkylated by contacting said polymer with an aldehyde and a diacylamine in the presence of an acid catalyst. The resulting diacylaminoalkylated polymer is readily hydrolyzed to an aminoalkylated form which is useful as a weak base ion exchange resin and as a precursor in the preparation of other ion exchange resins. For example, reacting a cross-linked polystyrene with paraformaldehyde and phthalimide in the presence of sulfuric acid and subsequently hydrolyzing the reaction product forms a cross-linked poly(aminomethyl styrene) useful as a weak base ion exchange resin and as a precursor in the preparation of strong base or chelate type resins.

Dependencies are inferred from the claim text.