| 摘要 |
<p>An object of the present invention is to provide a drawn polypropylene film as a wrapping material that has transparency and mechanical properties sufficient as a wrapping material yet having permeability of gases need for maintaining the freshness of the enclosed goods and in addition that enables control of permeability of gases to a certain proportion if needed even if secondary steps such as perforation processing, etc. is eliminated. The present invention provides a drawn polypropylene film drawn at least in a monoaxial direction, which comprises a propylene resin composition comprising a propylene polymer component and a copolymer component containing ethylene and propylene, wherein a content of the copolymer component is 7 to 70% by weight based on the weight of the composition, and the film has a thickness ÄD1Ü of 1.0 to 100 mu m and has the following characteristics (1) to (3): (1) ÄTH2OÜ(a permeability of water vapor) = 9 - 50 (unit: g/m<2> . 24 Hr, in accordance with JIS Z-0208), (2) ÄTO2Ü(a permeability of oxygen gas) = 600 - 12,500 (unit: nmol (STP)/m<2> . s . 100 kPa, in accordance with JIS K-7126A) (3) ÄTethyleneÜ(a permeability of ethylene gas) = 600 - 22,500 (unit: nmol (STP)/m<2> . s . 100 kPa, in accordance with JIS K-7126A)</p> |
