POLYESTER RESIN COMPOSITION, PROCESS FOR PRODUCTION OF SAME, AND FILM

摘要

A process for the production of a polyester resin composition by conducting polycondensation via esterification or trans- esterification, wherein an alkali metal phosphate in an amount of 1.3 to 3.0mol/ton and phosphoric acid in an amount of 0.4 to 1.5 times (by mole) that of the alkali metal phosphate are added at a stage between the point of time when the esterification or transesterification has been substantially completed and the point of time when the intrinsic viscosity reaches 0.4. A polyester resin composition obtained by the process exhibits excellent long-term resistance to hydrolysis and excellent mechanical characteristics.