Patent ID: 8889753

Claim:
Extrusion blown film comprising a polypropylene composition, said polypropylene composition comprising a random propylene copolymer (R-PP), a high melt strength polypropylene (HMS-PP), a polypropylene (B) and optionally a clarifier (C), wherein (a) the random propylene copolymer (R-PP) comprises units derived from propylene and at least another C 2 to C 20 α-olefin, (b) the high melt strength polypropylene (HMS-PP) has a branching index g′ of less than 1.0, (c) the polypropylene (B) has a MFR 2 (230° C.) measured according to ISO 1133 of at least 400 g/10 min, (d) the clarifier (C) comprises at least one α-nucleating agent (N), and wherein further (i) the branching index g′ of the random propylene copolymer (R-PP) and the branching index g′ of the polypropylene (B) are higher than the branching index g′ of the high melt strength polypropylene (HMS-PP), (ii) the random propylene copolymer (R-PP) has lower melt flow rate MFR 2 (230° C.) measured according to ISO 1133 than the polypropylene (B), (iii) the extrusion melt blown film (α) fulfill(s) the equation (I) Tm−Tc≦ 30 (I) wherein Tm is the melting temperature [° C.] making up more than 50% of the total melting enthalpy Hm of the extrusion melt blown film measured by DSC according to ISO 11357-3; Tc is the crystallization temperature [° C.] of the extrusion blown film measured by DSC according to ISO 11357-3; and (β) has a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 of 1.0 to 5.5 g/10 min, wherein the polypropylene (B) has been visbroken.