申请人:——
公开号:US20020128427A1
公开(公告)日:2002-09-12
The invention relates to a method for producing polyesters with a reduced content of free acetaldehyde from terephthalic acid and ethylene glycol via a catalyzed polycondensation in the melt and also the use of this method. The method is based thereby on the usage of highly active polycondensation catalysts, on the deactivation of these catalysts by the addition of phosphorous-containing inhibitors and the addition of acetaldehyde-bonding substances. The entire polycondensation is thereby implemented at temperatures beneath 280° C.
本发明涉及一种通过熔体中的催化缩聚反应从对苯二甲酸和乙二醇中生产游离乙醛含量较低的聚酯的方法,以及该方法的使用。这种方法的基础是使用高活性缩聚催化剂,通过添加含磷抑制剂和乙醛键合物质使这些催化剂失活。因此,整个缩聚反应是在低于 280°C 的温度下进行的。