'blown film grade showing superior rigidity, transparency and processing behavior.'

摘要

Blown film grade showing superior rigidity, transparency and processing behavior. The present invention relates to blown extrusion film comprising a polypropylene composition, said polypropylene composition comprises a random propylene copolymer, a high melt strength polypropylene, a polypropylene and optionally a bleach, where the random propylene copolymer comprises units derived from propylene and at least one other c2-20 alpha olefin, the high melt strength polypropylene has a branch index g 'of less than 1.0, the polypropylene (b) has an mfr2 (230 ° c) of At least 400 g / 10 minutes, the bleach comprises at least one alpha nucleating agent, and furthermore where the branching index g 'of the random polypropylene copolymer and the branching index g' of the polypropylene are greater than the branching index g ' of high melt strength polypropylene, the random propylene copolymer has a melt flow rate mfr2 (230 ° c) lower than polypropylene lene, the blown melt extrusion film and / or polypropylene composition (i) meets equation (i) tm - tc 30 (i) where tm is the melt temperature (° c) constituting up to 50% of enthalpy melt total hm of the blown extrusion melt film or polypropylene composition; tc is the crystallization temperature (° C) of the blown extrusion melt film or polypropylene composition; and / or (ii) has a mfr2 (230 ° C) melt flow rate of 1.0 to 5.5 g / 10 minutes.