An aliphatic polyester having a number-average molecular weight of from 500,000 to 2,000,000 includes an ester bonding site and an amide bonding site. The content of the amide bonding site is from 1 x 10-3% to 1 x 10-1% by mol based on total weight of the ester bonding site and the amide bonding site.
一种脂肪族聚酯的数均分子量为 500,000 至 2,000,000 之间,包括一个酯键部位和一个酰胺键部位。按
酯类键合位点和酰胺键合位点的总重量计算,酰胺键合位点的含量为 1 x 10-3% 至 1 x 10-1%(摩尔)。