Patent ID: 6132581
Filing Date: 2000-10-17
Classification: C09D

Abstract:
An aqueous electrocoating bath composition comprising a resinous phase dispersed in an aqueous medium, said resinous phase containing an ionic resin capable of deposition on a substrate serving as an electrode in an electrical circuit to form a substantially continuous coating thereon, said bath including contaminants capable of forming defects in a surface of the coating deposited on said substrate, the bath also including a polymer prepared from the polymerization of a polymerizable, ethylenically unsaturated monomer having a heterocyclic ring containing at least one ring nitrogen atom bonded to a vinyl group or a mixture of monomers comprising a polymerizable, ethylenically unsaturated monomer having a heterocyclic ring containing at least one ring nitrogen atom bonded to a vinyl group, wherein said polymer is present in an amount effective to abate formation of defects caused by the contaminants in the deposited coating surface.