Patent ID: 7335719

Claim:
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 manganese compounds in an amount of 10 to 150 ppm expressed in terms of the manganese element, and the molar ratio of the amount of the total amount of elements of the contained manganese element to the amount of the contained phosphorus element is within the range of the following formula (I): 0≦ P/M≦ 1 (I) wherein, P is the molar amount the phosphorus element in the polyester; M is the total molar amount of manganese element, and wherein the content of a cyclic dimer is within the range of 0.01 to 2.2% by weight based on the total weight of the polyester.