Electrodepositable Composition

Abstract

The present disclosure relates to a coating composition that can be applied to a conductive substrate via an anodic electrodeposition process, substrates coated with the coating composition and a process for applying the coating to a substrate. The electrodepositable coating composition is an aqueous dispersion comprising of an at least partially neutralized copolymer comprising α-olefin and unsaturated carboxylic acid and a curing agent. After a layer of the coating composition has been applied to the substrate, it can be heated to cure the coating and form a crosslinked network that provides a durable chip and corrosion resistant finish.

1 - 9 . (canceled) 
     
     
         10 . A substrate coated with a layer of an electrodepositable coating composition wherein the electrodepositable coating composition is an aqueous dispersion comprising a film forming binder wherein the film forming binder consists essentially of:
 i) an at least partially neutralized copolymer comprising α-olefin and unsaturated carboxylic acid; and   ii) a curing agent,   
       wherein the curing agent consists of zinc peroxide, magnesium peroxide, barium peroxide, strontium peroxide, cadmium peroxide, titanium peroxide, or a combination thereof. 
     
     
         11 . A substrate coated with a dried and cured layer of an electrodepositable coating composition wherein the electrodepositable coating composition is an aqueous dispersion comprising a film forming binder wherein the film forming binder consists essentially of:
 i) an at least partially neutralized copolymer comprising α-olefin and unsaturated carboxylic acid; and   ii) a curing agent,   
       wherein the curing agent consists of zinc peroxide, magnesium peroxide, barium peroxide, strontium peroxide, cadmium peroxide, titanium peroxide, or a combination thereof. 
     
     
         12 - 18 . (canceled) 
     
     
         19 . A process of producing a layer of a coating composition on a substrate said process comprising the steps of;
 A) providing a bath of an anodic electrodepositable coating composition wherein the electrodepositable coating composition is an aqueous dispersion comprising a film forming binder wherein the film forming binder consists essentially of:
 i) an at least partially neutralized copolymer comprising α-olefin and unsaturated carboxylic acid; and 
 ii) a curing agent, 
   wherein the curing agent consists of zinc peroxide, magnesium peroxide, barium peroxide, strontium peroxide, cadmium peroxide, titanium peroxide, or a combination thereof;   B) immersing the substrate in said anodic electrodepositable coating composition;   C) applying a voltage between a cathode and said substrate, which serves as a anode;   D) removing the substrate from the bath; and   E) heating the applied layer of electrodeposited coating composition.   
     
     
         20 - 27 . (canceled) 
     
     
         28 . The substrate of  claim 10  wherein the copolymer is neutralized with a neutralizing agent selected from the group consisting of an inorganic base, an organic base and a combination thereof. 
     
     
         29 . The substrate of  claim 10  wherein the neutralizing agent is N(R 2 ) 3 , wherein each R 2  is independently selected from the group consisting of H, CH 3 , CH 2 CH 3 , CH 2 CH 2 CH 3 , CH(CH 3 ) 2 , CH 2 OH, CH 2 CH 2 OH, CH 2 CH 2 CH 2 OH, CH 2 CH(OH)CH 3 , CH(CH 3 )CH 2 OH and CH(OH)CH 2 CH 3 . 
     
     
         30 . The substrate of  claim 10  wherein the curing agent is zinc peroxide. 
     
     
         31 . The substrate of  claim 10  wherein (a) the unsaturated carboxylic acid monomer is incorporated into the copolymer such that from 5 to 25 percent of the copolymer, by weight, is derived from the weight unsaturated carboxylic acid monomer; and (b) the copolymer has a melt index of 10 to 1000 grams/10 minutes prior to being neutralized. 
     
     
         32 . The substrate of  claim 10  wherein the neutralizing agent is present in an amount that is theoretically capable of neutralizing in the range of from 30 to 150 percent of the carboxylic acid groups of the copolymer comprising α-olefin and unsaturated carboxylic acid. 
     
     
         33 . The process of  claim 19  wherein the copolymer is neutralized with a neutralizing agent selected from the group consisting of an inorganic base, an organic base and a combination thereof. 
     
     
         34 . The process of  claim 19  wherein the neutralizing agent is N(R 2 ) 3 , wherein each R 2  is independently selected from the group consisting of H, CH 3 , CH 2 CH 3 , CH 2 CH 2 CH 3 , CH(CH 3 ) 2 , CH 2 OH, CH 2 CH 2 OH, CH 2 CH 2 CH 2 OH, CH 2 CH(OH)CH 3 , CH(CH 3 )CH 2 OH and CH(OH)CH 2 CH 3 . 
     
     
         35 . The process of  claim 19  wherein the curing agent is zinc peroxide. 
     
     
         36 . The process of  claim 19  wherein (a) the unsaturated carboxylic acid monomer is incorporated into the copolymer such that from 5 to 25 percent of the copolymer, by weight, is derived from the weight unsaturated carboxylic acid monomer; and (b) the copolymer has a melt index of 10 to 1000 grams/10 minutes prior to being neutralized. 
     
     
         37 . The process of  claim 19  wherein the neutralizing agent is present in an amount that is theoretically capable of neutralizing in the range of from 30 to 150 percent of the carboxylic acid groups of the copolymer comprising α-olefin and unsaturated carboxylic acid. 
     
     
         38 . The process of  claim 19  wherein the copolymer is neutralized with a neutralizing agent selected from the group consisting of an inorganic base, an organic base and a combination thereof.