Cathodic electrocoating binders

摘要

Binders useful for cathodic electrocoating are water-dilutable on addition of acid and comprise a mixture of (A) a polyadduct which carries basic nitrogen groups and contains groups of the formula (I) and/or (II) (I) (II) where R1 and R2 are hydrogen or methyl and R3 and R4 are alkyl or hydroxyalkyl or together are a 5- or 6-membered ring, and (B) a reaction product of a polyisocyanate and an olefinically unsaturated amine which carries a secondary amino group and a methacrylamide or methacrylate group.