A polyester resin having a diol unit containing a unit derived from ethylene glycol and a unit derived from a diol represented by the following formula (I), and a dicarboxylic acid unit containing a unit derived from an aromatic dicarboxylic acid in an amount of 50 mol% or more; wherein the entire diol unit contains the unit derived from ethylene glycol in an amount of 40 to 99 mol%, and the unit derived from a diol represented by formula (I) in an amount of 1 to 60 mol%:
wherein A represents an aromatic ring selected from the group consisting of benzene, naphthalene, anthracene, phenanthrene and pyrene; R1 represents a C1 to C12 alkyl group, a substituted or unsubstituted C6 to C12 aryl group or a halogen atom; n represents an integer of 0 to 4; and when plural R1s are present, R1s may be the same as or different from each other.
                            一种聚酯
树脂,其二醇单元含有
乙二醇衍生单元和下式(I)代表的二元醇衍生单元,二
羧酸单元含有芳香族二
羧酸衍生单元,含量为 50 摩尔%或更多;其中整个二元醇单元含有
乙二醇衍生单元,含量为 40 至 99 摩尔%,下式(I)代表的二元醇衍生单元含量为 1 至 60 摩尔%:
其中 A 代表选自苯、
萘、
蒽、
菲和
芘的芳香环;R1 代表 C1 至 C12 烷基、取代或未取代的 C6 至 C12 芳基或卤原子;n 代表 0 至 4 的整数;当存在多个 R1s 时,R1s 可彼此相同或不同。