Abstract: Provided are a double metal cyanide (DMC) catalyst used in copolymerization of an epoxide/carbon dioxide useful for preparing polyurethane, a foaming agent, an elastomer, sealant, a coating material, and the like, and an epoxide/carbon dioxide copolymer prepared using the same. In addition, the present invention provides a double metal cyanide (DMC) catalyst prepared using an ion-exchange resin without washing alcohol, and an epoxide/carbon dioxide copolymer having a high purity, a high selectivity, and a high carbonate content prepared using the same.

Abstract: Provided are a double metal cyanide (DMC) catalyst used in copolymerization of an epoxide/carbon dioxide useful for preparing polyurethane, a foaming agent, an elastomer, a sealant, a coating material, and the like, and an epoxide/carbon dioxide copolymer prepared using the same. In addition, the present invention provides a double metal cyanide (DMC) catalyst prepared us ing an ion-exchange resin without washing alcohol, and an epoxide/carbon dioxide copolymer having a high purity, a high selectivity, and a high carbonate content prepared using the same.

Abstract: Provided is a method for preparing poly(alkylene carbonate) containing ether linkages, by the copolymerization of an epoxy compound and carbon dioxide, with a trivalent metal complex prepared from a salen type ligand containing a quaternary ammonium salt, and a double metal cyanide (DMC) catalyst together. The amount of ether linkages can be controlled by regulating the weight ratio of two catalysts and the carbon dioxide pressure.

Abstract: This invention relates to a Salen type ligand including three or more quaternary ammonium salts of nitrate anions, to a trivalent metal complex compound prepared from this ligand and a method of preparing the same, to a method of preparing polycarbonate by copolymerizing an epoxide compound and carbon dioxide using the complex compound as a catalyst, and to a method of separating and collecting the catalyst from the copolymer after copolymerization. This catalyst used to copolymerize an epoxide compound and carbon dioxide can be more simply prepared, and has lower catalyst preparation and recovery costs, and higher activity, compared to conventional catalysts.

Abstract: Provided is a method for preparing poly(alkylene carbonate) containing ether linkages, by the copolymerization of an epoxy compound and carbon dioxide, with a trivalent metal complex prepared from a salen type ligand containing a quaternary ammonium salt, and a double metal cyanide (DMC) catalyst together. The amount of ether linkages can be controlled by regulating the weight ratio of two catalysts and the carbon dioxide pressure.

Abstract: This invention relates to a Salen type ligand including three or more quaternary ammonium salts of nitrate anions, to a trivalent metal complex compound prepared from this ligand and a method of preparing the same, to a method of preparing polycarbonate by copolymerizing an epoxide compound and carbon dioxide using the complex compound as a catalyst, and to a method of separating and collecting the catalyst from the copolymer after copolymerization. This catalyst used to copolymerize an epoxide compound and carbon dioxide can be more simply prepared, and has lower catalyst preparation and recovery costs, and higher activity, compared to conventional catalysts.