Biodegradation-resistant electrodepositable coating compositions and methods related thereto

摘要

Provided is a biodegradation resistant cationic electrodeposition composition of a resinous phase dispersed in an aqueous medium. The resinous phase includes an electrodepositable resin having cationic onium salt groups which have been at least partially solubilized with an alpha-alkoxycarboxylic acid of formula (I),where R is C1 to C6 alkyl or aryl and R' is H or C1 to C2 alkyl. Also provided is a method of electrocoating a conductive substrate serving as a cathode in an electrical circuit where the cathode and an anode are immersed in an aqueous electrodeposition bath containing the biodegradation resistant cationic electrodepositable composition described above, and substrates coated by the method.