Process for production of polyester resin

摘要

The present invention relates to a process for producing a polyester resin which comprises polycondensing a dicarboxylic acid component containing terephthalic acid or its ester-forming derivative as the main component and a diol component containing ethylene glycol as the main component in the presence of (1) a compound of at least one member selected from the group consisting of titanium group elements in Group 4A of the Periodic Table, via an esterification reaction or an ester exchange reaction, wherein the above compound (1) is added to an esterification reaction tank for a final stage in a multi-stage reaction apparatus or to an esterification reaction or ester exchange reaction product in a stage for transportation to a melt polycondensation step.