Cyclo-olefinic random copolymer composition and reaction product thereof

A polymer composition comprising

• (A) 100 parts by weight of a cyclo-olefinic random copolymer comprising an ethylene component and a cyclo-olefin component and having an intrinsic viscosity, measured in decalin at 135.degree. C., of 0.05 to 10 dl/g, a glass transition temperature (Tg) of 50.degree. to 230.degree. C., and a softening point of at least 70.degree. C.,
• (B) 5 to 150 parts by weight of at least one flexible polymer having a glass transition temperature of not more than 0.degree. C. selected from the group consisting of
• (a) a flexible cyclo-olefinic random copolymer comprising an ethylene component, a cyclo-olefin component and an alpha-olefin component having 3 to 20 carbon atoms,
• (b) an amorphous or low-crystalline flexible olefinic copolymer comprising at least two components selected from the group consisting of an ethylene component and alpha-olefin components having 3 to 20 carbon atoms,
• (c) a flexible olefin/nonconjugated diene copolymer comprising a nonconjugated diene component and at least two components selected from the group consisting of an ethylene component and alpha-olefin components having 3 to 20 carbon atoms, and
• (d) a flexible aromatic vinyl copolymer selected from the group consisting of random copolymers and block copolymers each comprising an aromatic vinyl hydrocarbon component and a conjugated diene component, and hydrogenation products of these copolymers, and
• (C) 0.004 to 1.0 part by weight of an organic peroxide.