Patent ID: 7497936
Filing Date: 2009-03-03
Classification: C08G,C09D

Abstract:
1. In a method for preparing 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; (b) an at least partially blocked polyisocyanate curing agent; and (c) an organotin catalyst for effecting the cure of the resin (a) and the curing agent (b), said method comprising the steps of the improvement comprising incorporating the organotin catalyst (c) into the mixture of reactive components during the preparation of the resin (a) in step (1), wherein the catalyst (c) comprises the following structure (I): where R 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.); 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.