Cathodic electrocoating composition containing morpholine dione blocked polyisocyanate crosslinking agent

Abstract

An improved aqueous cathodic electrocoating composition having a binder of an epoxy-amine adduct and a polyisocyanate crosslinking agent; wherein the improvement is the use of a polyisocyanate crosslinking agent having at least one crosslinkable morpholine dione group per molecule. Electrodeposited finishes are formed that have reduced volatile emissions and film weight loss when heated to cure.

1 - 12 . (canceled)  
     
     
         13 . A substrate electrocoated with the dried and cured aqueous cathodic electrocoating composition comprising a binder of an epoxy-amine adduct, a blocked polyisocyanate crosslinking agent and an organic or inorganic acid as the neutralizing agent for the epoxy-amine adduct: wherein the improvement is the incorporation of a blocked polyisocyanate crosslinking agent that has at least one isocyanate group blocked with a hydroxy-functional morpholine dione blocking agent.  
     
     
         14 . The electrocoated substrate of  claim 13 , in which the substrate is an OEM or industrial coated part.  
     
     
         15 . The electrocoated substrate of  claim 14 , in which the substrate is an auto body or auto part.