The problem to be solved by the present invention is to provide a polycarbonate copolymer containing a plant-derived raw material, which is excellent in the mechanical strength and heat-resistant and assured of small refractive index, large Abbe number, small birefringence and excellent transparency. The present invention provides a polycarbonate copolymer containing a constitutional unit derived from a dibydroxy compound represented by the following formula (1) and a constitutional unit derived from an alicyclic dihydroxy compound, wherein the ratio of the dihydroxy compound represented by the following formula (1) and the alicyclic dihydroxy compound to all dihydroxy compounds constituting said copolymer is 90 mol% or more.
本发明所要解决的问题是提供一种含有植物衍生原料的聚
碳酸酯共聚物,该共聚物具有优异的机械强度和耐热性,并确保其具有小折射率、大阿贝数、小双折射和优异的透明度。本发明提供了一种聚
碳酸酯共聚物,该共聚物含有由下式(1)表示的二羟基化合物衍生出的构型单元和由脂环族二羟基化合物衍生出的构型单元,其中由下式(1)表示的二羟基化合物和脂环族二羟基化合物占构成所述共聚物的所有二羟基化合物的比例为 90 摩尔%或以上。