Compositions containing impact copolymers made from a blend of a homopolymer phase and a rubber phase having a high ethylene content

摘要

The present invention relates to compositions containing impact copolymer compositions that are a blend of a propylene polymer phase and a rubber phase in which the ethylene content of the rubber phase is between about 75 to about 95% by weight. The rubber content of the impact copolymer composition ranges between about 35% by weight to about 60% by weight. The crystallinity of the high ethylene-content rubber phase provides overall improvement in film properties and also balance of film tensile properties in the machine and transverse directions. Compared to traditional impact copolymer compositions having a low ethylene content-rubber phase, the inventive copolymers have significantly enhanced melting and crystallization peaks due to polyethylene-like crystallinity in the rubber phase.