NOVEL ETHYLENE-PROPYLENE COPOLYMER

摘要

The present invention relates to new ethylene-propylene copolymers and to a process for preparing the same. The present copolymers are characterized by having both of a reactivity ratio product r1r2 between 0.5 and 1.5 and an isotactic index greater than 0. The present copolymers may be obtained by copolymerizing ethylene and propylene in the presence of a metallocene catalyst catalyst containing a group IVb metal and an alumoxane co-catalyst.