High OTR polyolefin films

摘要

Oriented polyolefin composite films are disclosed comprised of core including an olefin heteropolymer core consisting essentially of an ethylene/propylene copolymer having less than 10%, by weight, ethylene and having a skin layer on at least one of its surfaces comprised of a high modulus polypropylene. These films are characterized by an oxygen and moisture vapor transmission rate greater than that of conventional polypropylene films and a tensile modulus great enough to permit their use as packaging films. This combination of properties makes these films suitable for packaging fresh produce items which continue to respire after they are harvested.