CATALYST COMPOSITION COMPRISING TITANIUM OXYOXALATE CATALYST AND CATALYST IMPROVING AGENT, AND METHOD FOR PRODUCING POLYESTER USING THE COMPOSITION

摘要

PROBLEM TO BE SOLVED: To improve the polycondensation catalyst function of titanium oxyoxalate. SOLUTION: A non-titanium oxyoxalate type metal oxalate in an effective mount to improve the catalytic activity of titanium oxyoxalate, e.g. a metal oxalate selected from the group consisting of lithium oxalate Li2C2O4, sodium oxalate Na2C2O4, potassium oxalate K2C2O4, rubidium oxalate Rb2C2O4, and cesium oxalate Cs2C2O4 is added to titanium oxyoxalate or titanium oxalate and a metal catalyst.