Patent ID: 8168700

Claim:
In an electrodepositable coating composition comprising a resinous phase dispersed in an aqueous medium, said resinous phase comprising: (a) an active hydrogen-containing, cationic salt group-containing resin; and (b) an at least partially blocked polyisocyanate curing agent, the improvement comprising the inclusion in the electrodepositable coating composition of an organotin catalyst for effecting cure between the resin (a) and the curing agent (b), wherein said catalyst comprises the following structure (I): [R 1 ][R 2 ]—Sn═O (I) where R 1 and R 2 are the same or different, and each independently represents a monovalent hydrocarbon group, wherein the sum of the carbon atoms of R 1 and R 2 is greater than 8, said catalyst being present in the electrodepositable coating composition in an amount sufficient to effect cure of the electrodepositable composition at a temperature at or below 340° F. (171.1° C.); wherein the catalyst is dispersed in the resin(a) and/or the curing agent (b) of the resinous phase prior to the resinous phase being dispersed in the aqueous medium; and wherein the resinous phase is not subjected to a grinding or milling operation; and wherein there is no other curing catalyst in the resinous phase.