Sk Innovation Co., Ltd.

Ji Su Jeong

Bun Yeoul Lee

Myung Ahn Ok

Sujith Sudevan

Kwang Jin Chung

Sung Jae Na

Yong Gyu Han

Anish Cyriac

Kodiyan Varghese Jobi

Sang Hwan Lee

Provided is preparation of poly(alkylene carbonate) through alternating copolymerization of carbon dioxide and epoxide. According to the disclosure, by introducing a diepoxide compound to alternating copolymerization of carbon dioxide and epoxide compound using a metal(III) prepared with salen-type ligands containing quaternary ammonium salt as a catalyst, some of the polymer chains may be cross-linked to thus increase an average molecular weight of the copolymer and extend a distribution of molecular weight. A resin prepared according to this method may have high mechanical strength and rheological advantages.

Preparation of poly(alkylene carbonate) containing cross-linked high molecular weight chains

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.

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Daejeon, South Korea

Ji Su Jeong