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Chain extended epoxy-ester polymeric compositions for cationic electrodeposition

  • US 4,536,558 A
  • Filed: 12/27/1983
  • Issued: 08/20/1985
  • Est. Priority Date: 12/27/1983
  • Status: Expired due to Term
First Claim
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1. A water dispersible, cathodically electrodepositable resin characterized in that said resin comprises the reaction product of:

  • (A) epoxide functional esters formed by chain extending(a) polyepoxide having, on average, at least two epoxide group per molecule and a molecular weight of at least 350;

    with(b) polycarboxylic acid bearing at least two carboxyl groups per molecule, wherein said polyepoxide and said polycarboxylic acid are reacted in amounts which provide between about 0.1 and about 0.8 acid groups per epoxide group; and

    (B) secondary amines, wherein said ester and said amines are reacted in amounts sufficient to react essentially all of said epoxide groups of said ester with said amines,said reaction product being dispersible in water with the aid of water soluble acid to provide cationic groups in said resin.

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