| 摘要 |
Thermoplastic polyesters are prepared by multistage polycondensation of dihydroxy compounds with dicarboxylic acids or esters or ester-forming derivatives thereof by a process in which, in at least one first stage, an alkali metal compound or an alkaline earth metal compound is added in an amount of from 1 to 10 mmol, calculated as alkali metal or alkaline earth metal, per kg of polyester, and at least one further stage is carried out as a solid-phase condensation.
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