Alkanolamine hydroxy-capped epoxy for cathodic electrocoat

Claim 1

A resin composition particularly adapted for use as a film-forming composition in a cathodic electrodeposition process, comprising the reaction product of (A) an epoxide; and (B) mono-amine and a primary hydroxyl.

Claim 9

A method of coating articles with a film-forming resin composition using a cathodic electrodeposition process wherein a cathodic electrodepositable amine-containing epoxide resin is mixed with a cross linking agent, the resin is then salted with an acid and solubilized to form an aqueous emulsion, the aqueous principal emulsion is mixed with a pigment paste and water to form an electrodeposition bath, the bath is contained in an electrically insulated tank containing an anode, an electrically-conductive article is electrically connected to a direct current electric circuit to act as a cathode, the article is immersed in the bath wherein a DC current is passed across the article resulting in a deposition of a film of the resin and crosslinking agent and pigment paste upon the surfaces of the article, the article is removed from the bath, and then the coating is cured, the improvement comprising utilizing as the cathodic electrodepositable amine-containing epoxide resin composition a resin composition comprising the reaction of (A) an epoxide; and (B) the reaction product of a ketone and an alkanolamine, wherein the alkanolamine comprises a primary monoamine and a primary hydroxyl.

Claim 10

A method of coating articles with a film-forming resin composition using a cathodic electrodeposition process wherein a cathodic electrodepositable amine-containing epoxide resin is mixed with a cross linking agent, the resin is then salted with an acid and solubilized to form an aqueous emulsion, the aqueous principal emulsion is mixed with a pigment paste and water to form an electrodeposition bath, the bath is contained in an electrically insulated tank containing an anode, an electrically-conductive article is electrically connected to a direct current electric circuit to act as a cathode, the article is immersed in the bath wherein a DC current is passed across the article resulting in a deposition of a film of the resin and crosslinking agent and pigment paste upon the surfaces of the article, the article is removed from the bath, and then the coating is cured, the improvement comprising utilizing as the cathodic electrodepositable amine-containing epoxide resin composition a resin composition comprising the reaction of (A) an epoxide; and (B) the reaction product of a ketone and an alkanolamine, wherein the alkanolamine comprises a primary monoamine and a primary hydroxyl.