| 摘要 |
A packaging film which comprises a) a sealing ply comprising a mixture of a1) 40 to 80% by weight of a C2-C3 random copolymer having a C2 content of 1-15% by weight or a2) 40 to 80% by weight of a polymer blend consisting of a2.1) 60 to 98% by weight of a crystalline copolymer of propylene with ethylene and/or an alpha -olefin of the general formula CH2=CHR, where R is a linear or branched alkyl radical having 2-8 carbon atoms, containing 85-99.5% by weight of propylene, and a2.2) 2 to 40% by weight of a resilient copolymer of ethylene with propylene and/or an alpha -olefin of the general formula CH2=CHR, containing 20-70% by weight of ethylene, or a3) 40 to 80% by weight of a highly amorphous polypropylene having a crystalline polypropylene fraction of up to 10% by weight with an enthalpy of fusion of not more than 40 J/g and a melt flow index between 0.1 and 100 g/10 min, where the polypropylene may be a homopolymer of propylene or a copolymer of propylene with one or more alpha -olefins and with a propylene fraction of at least 80 mol %, and a4) 20 to 60% by weight of an ethylene polymer and b) a monolayer or multilayer base ply comprising thermoplastic polymers, the packaging film being peelable after sealing against a polypropylene ply with a force of not more than 30N/15 mm, and its use.
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