Useful as catalysts for the reaction of a polyisocyanate or a partially blocked polyisocyanate with a hydroxy-containing compound are organotins of the formula R.sub.2 Sn[X--R.sup.1 --OH].sub.2 where R is a C.sub.1 -C.sub.8 alkyl or an aryl group, R.sup.1 is a C.sub.2 -C.sub.9 divalent hydrocarbyl group which may contain a hydroxyl substituent, and X is a linking group which may be --S-- or --O.sub.2 C--.
公式为R.sub.2 Sn[X--R.sup.1 --OH].sub.2的
有机锡化合物,在聚
异氰酸酯或部分阻塞的聚
异氰酸酯与含羟基化合物反应中作为催化剂具有实用价值。其中,R为C.sub.1-C.sub.8烷基或芳基,R.sup.1为C.sub.2-C.sub.9二价烃基,可能含有羟基取代基,X为连接基,可能为--S--或--O.sub.2 C--。