HEAT-SEALABLE BIAXIALLY ORIENTED POLYPROPYLENE FILM HAVING IMPROVED BARRIER PROPERTIES

摘要

The invention relates to a multi-layer, sealable biaxially oriented polypropylene film consisting of a base layer and at least one sealable covering layer. The base layer contains between 1 and 15 weight % of a resin with a mean molecular weight Mw of between 600 and 1,500 and between 1 and 6 weight % of a wax with a mean molecular weight Mn of between 200 and 700. The n-heptane insoluble part of the polypropylene of the base layer has a chain isotactic index of at least 95 %, as measured by 13C-NMR spectroscopy. The invention also relates to a method for producing said film and to its use.