| abstract |
A process for the manufacture of high molecular weight linear polyesters which are derived from dicarboxylic acids or their ester-forming derivatives and from diols, by condensing polyester precondensates, having a relative viscosity of at least 1.05, at from 270 DEG to 340 DEG C. under reduced pressure, the condensation being started at from 290 DEG to 340 DEG C. and the temperature being lowered as the condensation progresses, the final temperature being at least 10 DEG C. above the melting point of the particular polyester produced, and an apparatus for carrying out the process. |