POLYESTER RESIN CONTAINING POLYCARBONATEDIOL HAVING EXCELLENT SUPPLENESS, AND ITS PREPARATION

摘要

PURPOSE: A polycarbonatediol-containing polyester resin is provided to have excellent flexibility and moldability, and to reduce the used amount of solvent for reducing viscosity because of low viscosity relative with existing polyester resin. CONSTITUTION: A manufacturing method of a polycarbonatediol-containing polyester resin comprises: a step of ester coupling reaction to the dicarboxylic acid compound, and dihydroxy compound to equivalent ratio of 1:0.7-1:0.9; and a step of adding 15-50 weight% of polycarbonate diol to the product. A polyester resin containing polycarbonate diol manufactured by the manufacturing method has weight average molecular weight of 3,000-5,000, and is in chemical formula 1. In chemical formula 1, n is a positive integer.