Lotte Chemical Corporation

Young Keun Yang

Seung Woong Yoon

Yong Taek Hwang

Kyung Ho Lim

Jong Ho Bae

Disclosed herein are a novel complex metal oxide catalyst, and a method of preparing polyester using the same. The metal-bound compound of the present invention has a higher catalytic activity as compared to an antimony catalyst and existing titanium catalysts to be easily synthesized and stabilized, have a sufficient polymerization activity even with a small amount, and be used as an environmentally friendly catalyst for polyester polymerization. In addition, when preparing polyester by using the complex metal oxide of the present invention, since catalytic activity caused by phosphorus (P) which is a thermal stabilizer used to decrease pyrolysis at the time of hot-melting and molding is not deteriorated, an excessive amount of phosphorus may be used as compared to the related art, such that pyrolysis less occurs, whereby the yellowing phenomenon may be decreased and high viscosity may be maintained. Therefore, the complex metal oxide may be usefully applied to the preparation of polyester having good physical properties, in particular, polyethylene terephthalate.

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Daejeon, South Korea

Young Keun Yang