1,Cathodic electrocoating compositions containing an anti-crater agent

摘要

This patent described the preparation of an anti-crater agent.The highly branched water-reducible polyester is prepared in a similar way to that described in WO 2006 044871,except that the carboxyl groups,formed by the chain-extending reaction with a monofunctional epoxy resin,are reacted with a polyfunctional epoxy resin (as the chemical coupling agent) instead of the polyfunctional isocyanate resin.