A transparent thermoplastic resin composition having high ductility and their use

Described are compositions comprising at least one cycloolefin polymer and at least two thermoplastic elastomeric block copolymers selected from the group of hydrogenated styrene-butadiene block copolymers, the hydrogenated styrene-isoprene block copolymers and hydrogenated styrene-isobutylene block copolymers, wherein the styrene content in the thermoplastic, elastomeric block copolymers, and their amounts are selected in the mixture of the thermoplastic elastomeric block copolymers such that the refractive index of the mixture of the thermoplastic elastomeric block copolymer from 1.520 to 1.540 as measured at a wavelength of 589 nm. These compositions are transparent and molded articles thereof are characterized by high impact strength and ductility as well as a reduced tendency to white fracture from. The compositions are ideally suited for the production of containers of all kinds.