Biaxially oriented film of polypropylene with improved mechanical and barrier properties

摘要

The invention relates to a biaxially oriented polypropylene film whose n-heptane-insoluble content has a chain isotacticity index, measured by <13>C-NMR spectroscopy, of at least 95%. The base layer contains essentially no resin. The modulus of elasticity of the film in the longitudinal direction is greater than 2500 N/mm<2>. The modulus of elasticity of the film in the transverse direction is greater than 4000 N/mm<2>. The invention also relates to a process for the production of the polypropylene film and to the use thereof.