PELICULA DE POLIPROPILENO DE CAPAS MULTIPLES BIAXIALMENTE ORIENTADA, OPACA, SELLABLE, PROCEDIMIENTO PARA SU PRODUCCION Y SU USO.

摘要

A biaxially oriented opaque multilayer sealable polypropylene film made of a core layer, an intermediate layer/s disposed on one or both sides thereof and an outer layer/s disposed on one or both sides on the intermediate layer/s or the core layer is described. The core layer contains a polypropylene polymer or a polypropylene blend and calcium carbonate with an average particle diameter of 1 to 2 mu m and, if required, further additives. The intermediate layers on two sides can be the same or different. The intermediate layer/s contain/s a polypropylene polymer or a polypropylene blend and, if required, additives. The outer layers on two sides can be the same or different. At least one outer layer has a thickness of </= 0.4 mu m. The outer layer/s contain/s a copolymer of ethylene and propylene or of ethylene and butylene or of propylene and butylene or of ethylene and another alpha -olefin with 5 to 10 carbon atoms or of propylene and another alpha -olefin with 5 to 10 carbon atoms or a terpolymer of ethylene and propylene and butylene or of ethylene and propylene and another alpha -olefin with 5 to 10 carbon atoms or a blend of one or more of the aforementioned copolymers and/or terpolymers with polypropylene or a blend of two or more of the aforementioned copolymers and/or terpolymers and, if required, additives. The use of and a process for preparing the multilayer polypropylene film are also described.