Cationic electrodepositable compositions of blocked polyisocyanates and amine-epoxy resins containing diorganotin bis-mercaptides and bis-carboxylates as catalysts

摘要

Useful as catalysts for the reaction of a polyisocyanate or a partially blocked polyisocyanate with a hydroxy-containing compound are organotins of the formula R2Sn[X-R1-OH]2 where R is a C1-C8 alkyl or an aryl group, R1 is a C2-C9 divalent hydrocarbyl group which may contain a hydroxyl substituent, and X is a linking group which may be -S- or -O2C-. Also disclosed are cationic electrodepositable (CED) compositions containing such catalysts.