| 摘要 |
PURPOSE: Double metal cyanide(DMC) catalysts that are supported on a polyurethane foam are provided in which the foam-supported catalysts are especially useful for preparing polyether polyols having low unsaturation. CONSTITUTION: The process for making an epoxide polymer comprises polymerizing an epoxide in the presence of a polyurethane foam-supported double metal cyanide(DMC) catalyst, wherein the foam-supported DMC catalyst comprises: (a) a DMC catalyst; and (b) a polyurethane foam support, wherein the DMC catalyst contains a slight excess of a metal halide salt and is substantially crystalline by powder X-ray diffraction analysis, wherein the epoxide is selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, and mixtures thereof, and wherein the DMC catalyst is a zinc hexacyanocobaltate. |
