Cathodic electrocoating composition containing a morpholine dione crosslinking agent

Abstract

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

1 - 13 . (canceled)  
     
     
         14 . A process, comprising contacting a morpholine dione compound with a film-forming amine compound to form a crosslinked film.  
     
     
         15 . A morpholine dione crosslinking agent having the structural formula:  
       
         
           
           
               
               
           
         
         wherein n is 0 or a positive integer from 1-4 and R is an alkyl group having 1-8 carbon atoms, and  
         wherein said morpholine dione is used as a crosslinking agent in a coating composition containing amine compound(s) that are capable of reacting with morpholine dione groups.  
       
     
     
         16 . A morpholine dione crosslinking agent having the structural formula:  
       
         
           
           
               
               
           
         
         wherein n is 0 or a positive integer from 1-4 and R is an alkyl group having 1-10 carbon atoms, and  
         wherein said morpholine dione is used as a crosslinking agent in a coating composition containing amine compound(s) that are capable of reacting with morpholine dione groups.  
       
     
     
         17 . (canceled)  
     
     
         18 . A substrate electrocoated with the dried and cured composition of claim  1 .  
     
     
         19 . The coated substrate of  claim 18 , in which the substrate is an OEM or industrial part.  
     
     
         20 . The coated substrate of  claim 19 , wherein the substrate is an auto body or auto part.