| 摘要 |
Extrusion blown film comprising a polypropylene composition, said polypropylene composition comprises a random propylene copolymer, a high melt strength polypropylene, a polypropylene and optionally a ±-nucleating agent, wherein
(a) the random propylene copolymer comprises units derived from propylene and at least another C 2 to C 20 ±-olefin,
(b) the high melt strength polypropylene has a branching index g' of less than 1.0,
(c) the polypropylene has a MFR 2 (230 °C) of at least 400 g/10min,
wherein further
€¢ the random propylene copolymer (R-PP), the high melt strength polypropylene (HMS-PP), and the polypropylene (B) are chemically different, and
€¢ the extrusion melt blown film fulfills the equation Tm - Tc ‰¤ 30
wherein
Tm
is the melting temparetaure [°C] making up more than 50% of the total melting enthalpy Hm of the extrusion melt blown film or of the polypropylene composition measured by DSC according to ISO 11357-3;
Tc
is the crystallization temperature [°C] of the extrusion melt blown film or of the polypropylene composition measured by DSC according to ISO 11357-3. |
