POLYETHERESTER POLYMER HAVING EXCELLENT HYDROLYSIS RESISTANCE AND ITS PRODUCTION

摘要

PURPOSE: A process of preparing the titled compound by blocking a hydroxyl group or carboxyl group of a polyester copolymer to inhibit the hydrolysis of polyetherester copolymer by the end group is provided, which produces polyetherester having excellent hydrolysis resistance and without lowering polymerization degree. CONSTITUTION: In polycondensing a polyetherester polymer comprising polybutyleneterephthalate polyester as a hard segment and polytetramethyleneetherglycol polyether as a soft segment, 0.05 to 2.5% by weight of a carbodiimide compound having a melting point of 60 to 90deg.C based on the weight of the polymer is added during polymerization. The polymer has a holding rate of limiting viscosity of more than 99% and a decrease rate of a carboxyl end group of less than 92%.