A polymerization catalyst for polyester production which contains neither a germanium compound nor an antimony compound as a major component. It contains aluminum as the main metallic ingredient, has excellent catalytic activity, and gives a polyester which is effectively inhibited from suffering thermal degradation, during melt molding, without deactivating or removing the catalyst, and is excellent in thermal stability, stability to thermal oxidation, and hydrolytic resistance. The polymerization catalyst contains as a first metallic ingredient at least one member selected among aluminum and compounds thereof and further contains a phosphorus compound represented by a specific chemical formula. The polyester produced with this catalyst is usable as fibers, films, sheets, various moldings including hollow moldings, etc.
一种用于聚酯生产的聚合催化剂,其主要成分既不含
锗化合物,也不含
锑化合物。它以铝为主要
金属成分,具有极佳的催化活性,在熔融成型过程中可有效抑制聚酯的热降解,而无需使催化剂失活或移除催化剂,并具有极佳的热稳定性、热氧化稳定性和耐
水解性。聚合催化剂的第一种
金属成分是铝及其化合物中的至少一种,还含有一种以特定
化学式表示的
磷化合物。用这种催化剂生产的聚酯可用作纤维、薄膜、板材、各种模塑件(包括中空模塑件)等。