| abstract |
An object of the present invention is to provide an α-olefin / cyclic olefin copolymer having a good light transmittance, and a method for efficiently producing the copolymer. An α-olefin / cyclic olefin comprising (A) a small constituent unit selected from linear or branched α-olefins having 2 to 30 carbon atoms and (B) a constituent unit derived from a cyclic olefin. (A) 1.0 <(Mw / Mn) ≦ 1.8, (b) 1,000 ≦ Mw ≦ 5,000,000, and (c) light transmission under specific conditions Rate (T%) is in the range of 90% ≦ T% ≦ 99%, and (d) the relation between the content X (mol%) of the cyclic olefin in the polymer and the glass transition temperature Y (° C.) is 10 <X In the range of <50, Y> (13/3) X-230 / 3 is satisfied, and (e) the molar ratio of the structural unit derived from the α-olefin to the structural unit derived from the cyclic olefin is 50/50 to 50/50. It is in the range of 90/10. [Selection diagram] Fig. 1 |