Chain extended epoxy-ester polymeric compositions for cationic electrodeposition
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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Abstract
This invention relates to water dispersible, cathodically electrodepositable resins which are prepared by reacting chain extended polyepoxides with secondary amines. The polyepoxides have been chain extended with polycarboxylic acids. The resin is dispersible in water with the aid of a water soluble acid to provide cationic groups in the resin. Preferred crosslinking agents for the resin comprises capped isocyanates which may be either incorporated in the resin or preferably co-deposited with the resin from the coating composition bath.
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Citations
14 Claims
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1. A water dispersible, cathodically electrodepositable resin characterized in that said resin comprises the reaction product of:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification