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 formulaPPR.sub.2 Sn[X--R.sup.1 --OH]. sub.2PP wherePPR is a C.sub.1 -C.sub.8 alkyl or an aryl group,PPR.sup.1 is a C.sub.2 -C.sub.9 divalent hydrocarbyl group which may contain a hydroxyl substituent, andPPX is a linking group which may be --S-- or --O.sub.2 C--.PPAlso disclosed are cationic electrodepositable (CED) compositions containing such catalysts.