A polytrimethylene terephthalate resin comprising 60 to 100 mole % of (a) trimethylene terephthalate recurring units, and 0 to 40 mole % of (b) at least one monomer unit obtained from a comonomer copolymerizable with at least one of the monomers used for forming the recurring units, the total molar amount of (a) monomer units and (b) monomer units being 100 mole %, and the resin having the following characteristics (A) to (D): (A) an intrinsic viscosity [η] of from 0.6 to 4 dl/g; (B) a molecular weight distribution (Mw/Mn) of from 2 to 2.7; (C) a cyclic dimer content of not greater than 2% by weight; and (D) a psychometric lightness L-value of from 70 to 100 and a psychometric chroma b*-value of from −5 to 25.
                            一种聚
对苯二甲酸三亚甲基酯
树脂,包括60至100摩尔%的(a)
对苯二甲酸三亚甲基酯循环单元和0至40摩尔%的(b)至少一种单体单元,该单体单元由可与至少一种用于形成循环单元的单体共聚的共聚单体获得,(a)单体单元和(b)单体单元的摩尔总量为100摩尔%,该
树脂具有以下特性(A)至(D):(A) 固有黏度[η]为 0.6至4分升/克;(B)分子量分布(Mw/Mn)为2至2.7;(C)环状二聚体含量不大于2%(重量);(D)心理光度L值为70至100,心理色度b*值为-5至25。