abstract |
Useful as catalysts for the reaction of a polyisocyanate or a partially blocked polyisocyanate with a hydroxy-containing compound are organotins of the formula nR₂Sn⁅X-R¹-OH]₂ nwhere nR is a C₁-C₈ alkyl or an aryl group, nR¹ is a C₂-C₉ divalent hydrocarbyl group which may contain a hydroxyl substituent, and nX is a linking group which may be -S- or -O₂C-. |