| 摘要 |
PROBLEM TO BE SOLVED: To provide a stretched film in which unevenness of thickness is less than in the conventional film.SOLUTION: A stretched film includes one or more layers composed of a polyolefin-based composition including: (a) an olefinic polymer (A) having a melting point (Tm-D), defined by an apex of a peak observed on the highest temperature side of a melting endothermic curve obtained by retaining a sample in nitrogen atmosphere at -10°C for five minutes and subsequently raising the temperature at 10°C/min while using a differential scanning calorimeter (DSC), of higher than 120°C; and (b) an olefinic polymer (B) having a melting endotherm (ΔH-D) obtained from the melting endothermic curve obtained by retaining a sample in nitrogen atmosphere at -10°C for five minutes and subsequently raising the temperature at 10°C/min while using a differential scanning calorimeter (DSC), of 0-80 J/g, and having molecular weight distribution (Mw/Mn) of less than 3.0, and the thickness of the layer is 30 to 400 μm.SELECTED DRAWING: None |
