A polyester based on poly(trimethylene terephthalate) consisting essentially of trimethylene terephthalate repeating units, comprising at least one kind of compound selected from the group consisting of alkali metal compounds, alkaline earth metal compounds and manganese compounds in an amount of 10 to 150 ppm expressed in terms of the metal element in a molar ratio of the total amount of elements of the contained alkali metal elements, alkaline earth metal elements and manganese element to the amount of the contained phosphorus element within the range of the following formula (I):
0≦P/M≦1 (I)
wherein, P is the molar amount of the phosphorus element in the polyester; M is the total amount of the alkali metal elements, alkaline earth metal elements and manganese element.
一种基于聚
对苯二甲酸三亚甲基酯的聚酯,主要由
对苯二甲酸三亚甲基酯重复单元组成,含有至少一种从碱
金属化合物、碱土
金属化合物和
锰化合物组成的组中选出的化合物,以所含碱
金属元素、碱土
金属元素和
锰元素的总量与所含
磷元素的摩尔比表示的
金属元素量为 10 至 150 ppm,其范围如下式(I)所示:
0≦P/M≦1 (I)
其中,P 为聚酯中
磷元素的摩尔量;M 为碱
金属元素、碱土
金属元素和
锰元素的总量。