NOVEL ELECTRODEPOSITION COATING SYSTEM HAVING IMPROVED IMPACT AND CHIP RESISTANCE

摘要

The present invention provides a resin which is a mixture of a) the product of a diol and one or more diepoxides and b) an A-B-A block copolymer wherein A represents blocks of an epoxy/diol copolymer wherein A reaction product of a diol and a diepoxide, and B represents blocks of an expoxy-capped, carboxylterminated polybutadiene or polybutadiene/ acrylonitrile copolymer. Amine resins, produced by reaction of this resin with an amine are useful as the principal resin in electrocoating formulations which produce deposited films having excellent corrosion resistance and improve impact and chip resistance. 53