Improved double metal cyanide catalysts are disclosed. The substantially amorphous catalysts of the invention are more active for polymerizing epoxides than conventional DMC catalysts, which have a substantial crystalline component. Polyol products made with the catalysts are unusually clear, have exceptionally low unsaturations, and contain no detectable amount of low molecular weight polyol impurities. Methods of making the improved DMC catalysts are also disclosed. In one method, the reactants are intimately combined to produce a catalyst of the invention. In another method, an organic complexing agent is initially present in the reactant solutions.
本发明公开了改进的双
金属
氰化物催化剂。本发明中的非晶态催化剂比具有实质性晶体成分的传统
DMC催化剂更活性,用该催化剂制备的聚醚多元醇产品异常清澈,具有异常低的不饱和度,并且不含有可检测到的低分子量聚醇杂质。本发明还公开了制备改进的
DMC催化剂的方法。在一种方法中,反应物被密切结合以产生本发明的催化剂。在另一种方法中,有机络合剂最初存在于反应物溶液中。