BIAXIALLY ORIENTED POLYPROPYLENE FILM STRUCTURE HAVING IMPROVED MECHANICAL AND BARRIER PROPERTIES

摘要

A single-ply or laminar biaxially oriented polypropylene film structure is described. The n-hexane-insoluble fraction of the film has a chain isotaxy index, measured by means of 13C-NMR spectroscopy, of at least 95%. The base ply of the laminar structure (or the single ply of the single-ply structure) contains essentially no hydrocarbon resin or low molecular weight resin. The modulus of elasticity of the film structure in the longitudinal direction is greater than 2,500 N/mm2. The modulus of elasticity of the film structure in the transverse direction is greater than 4,00 N/mm2. A process for the production of the polypropylene film structure and the use thereof are also described.