| abstract |
The present invention relates to a complex compound having an onium salt and a metal sunter having a Lewis acid group in one molecule, and a method for producing a polycarbonate by copolymerizing an epoxy compound and carbon dioxide using the catalyst as a catalyst.n n n According to the present invention, regardless of the concentration of the catalyst in the polymerization medium copolymerizing the epoxy compound and carbon dioxide, the growth point of the polymer chain is always located around the metal, thus exhibiting high activity even under high monomer / catalyst ratio conditions. Therefore, it is possible to reduce the amount of catalyst used, which is not only economically advantageous, but also can provide high molecular weight polycarbonate. Also, by implementing polymerization activity at high temperature, the conversion rate is increased and the heat of polymerization reaction can be easily removed, so it is easy to apply commercial process. Do. |