PROCESS FOR PRODUCTION OF POLYESTER

摘要

Disclosed is a process for producing a polyester composition which can be obtained by polycondensation of a dicarboxylic acid or ester-forming derivative thereof and a diol or ester-forming derivative thereof in presence of a polycondensation catalyst, in which a polyester having a good color tone can be obtained by adding a specific phosphorus compound after a polycondensation catalyst is added and pressure reduction in polymerization reactor is started and before the polycondensation of the polyester is substantially completed, and at a time in which the polyester reaches 75% or more of the intrinsic viscosity to be finally reached in said polymerization reactor.