A bischloroformate composition is represented by a formula (1) below, contains a plurality of Ar components, and has an average number of monomer units (m1), which is calculated by an expression (Numerical Expression 1) below, ranging from 1.0 to 1.99. The plurality of Ar components are each independently Ar1 or Ar2. The plurality of Ar components include at least one Ar1 and at least one Ar2. Ar1 is a group represented by a formula (2) below. Ar2 is a group represented by a formula (3) below. A molar composition ratio represented by Ar1 / (Ar1 + Ar2) ranges from 45 mol% to 99 mol%.
[Numerical Expression 1] average number of monomer units m1=1+Mav−M1/M2
双
氯甲酸酯组合物由以下式(1)表示,含有多种 Ar 组分,其单体单元的平均数量(m1)由以下表达式(数值表达式 1)计算,范围在 1.0 至 1.99 之间。多个 Ar 组分各自独立地为 Ar1 或 Ar2。多个 Ar 组份包括至少一个 Ar1 和至少一个 Ar2。Ar1 是由下式 (2) 表示的基团。Ar2 是由下式(3)表示的基团。以 Ar1 / (Ar1 + Ar2) 表示的摩尔成分比范围为 45 摩尔%至 99 摩尔%。
[数字表达式 1] 平均单体单元数 m1=1+Mav-M1/M2