The purpose of the present invention is to provide a polyester resin or polyester carbonate resin, which has high refractive index, while achieving an excellent balance between heat resistance and low birefringence. A polyester resin or a polyester carbonate resin, which contains repeating units represented by the following formulae (1) and (2), and wherein the ratio of the repeating unit represented by formula (1) to the repeating unit represented by formula (2) is 15:85 to 85:15. (In formula (1), each of rings Z1 and Z2 represents a polycyclic aromatic hydrocarbon group having 9-20 carbon atoms; each of R1, R2, R7 and R8 independently represents a hydrocarbon group which may contain an aromatic group having 1-12 carbon atoms; each of R3-R6 and R9-R16 represents a hydrogen atom or an aliphatic or aromatic substituents; each of j, k, r and s independently represent an integer of 0 or more; and each of m, n, p and q independently represents 1 or 2) (In formula (2), each of R7, R8, R17 and R18 independently represent a hydrocarbon group which may contain an aromatic group having 1-12 carbon atoms; each of R9-R16 and R19-R26 represents a hydrogen atoms or an aliphatic or aromatic substituents; and each of r, s, t and u independently represents an integer of 0 or more.)
本发明的目的是提供一种聚酯
树脂或
碳酸聚酯
树脂,它具有高折射率,同时在耐热性和低双折射之间达到极佳的平衡。一种聚酯
树脂或聚酯
碳酸酯
树脂,它含有下式(1)和(2)所代表的重复单元,其中式(1)所代表的重复单元与式(2)所代表的重复单元的比例为 15:85 至 85:15。(在式 (1) 中,环 Z1 和 Z2 各自代表具有 9-20 个碳原子的多环
芳香烃基团;R1、R2、R7 和 R8 各自独立地代表可包含具有 1-12 个碳原子的芳香基团的烃基;R3-R6 和 R9-R16 各自代表氢原子或脂肪族或芳香族取代基;j、k、r 和 s 各自独立地代表 0 或以上的整数;式(2)中,R7、R8、R17 和 R18 各自独立地代表一个烃基,该烃基可包含一个具有 1-12 个碳原子的芳香族基团;R9-R16 和 R19-R26 各自独立地代表一个氢原子或一个脂肪族或芳香族取代基;r、s、t 和 u 各自独立地代表一个 0 或以上的整数。)