HIGH OTR POLYOLEFIN FILMS.

摘要

Oriented polyolefin films employ an olefin heteropolymer and a high modulus polypropylene. The high modulus polypropylene can be blended with the olefin heteropolymer in a single layer film or to form the core of a multilayer film. Alternatively, the high modulus polypropylene can be added as a surface layer to a core of the olefin heteropolymer. 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.